Water manifold for a solar heater

Many people get the idea to heat water after attempting to drink from a hose that has been laying in the sun.  The water is hot so wouldnt it be easy to get a 100 of black irrigation tubing a coil it up. Yes this will heat water but there are problems involved with this method.

First is poor efficiency. As the water travels the length of the tube it begins to quickly gain heat, but the hotter it gets the slower it gains additional heat.  It would be better to use several short lengths to warm the water only as much as you need.  Adjusting the optimum length is more than I wish to get into, but with some experimentation you will find a range that suits your needs.

Another problem with one long coil is resistance to flow.  The longer you make the tube the slower the water will flow.  A manifold  can solve both these problems. Fabricating a manifold may appeal to some DIY folks, but hot tubs often use manifolds and so they are readily available for about $10.00
Water Manifold 2"S x 2"S (6) 3/4" Ports



Its been pointed out to me that a better choice would be CPVC due to the high temperatures these systems can reach especially when not in use and the water is not moving.

Flow Gaurd MultiPort CPVC Manifold

By using several short lengths you will increase the effective diameter and reduce the resistance as well as the demands on your pump.

Dont forget to use a high temperature water pump.  They are easy to find, but this is an important consideration that could be over looked.

Also the roof may look like an ideal place for a solar collector but you will have to have a pump tha can provide enough head pressure which will influence the cost of the pump and your choice of locations for the collector.

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Thermal Solar Collector

This guy probably has a better idea.  But I will leave the rest of my post in place because it might stir an idea

The Polycarbonate sheets shown here are refered to as Twin Wall and 5 Wall.They are extremely strong and UV protected, and often used for greenhouse glazing.

While I have seen polycarbonate used as a collectors glazing I have not been able to find an example of this type of material used as the conduit for a thermal solar absorber.

This light weight material would appear to be near to perfect for this application if placed in an insulated box with a black background.  An extra layer of glazing may not even be necessary.

The area would be well utilized with water passages, and at $57.00 for a 4x8 sheet the price is reasonable.

A manifold could be created by cutting back the inner walls by about 1/2 " and then sealing the end with an end cap.  A PVC quick connect could then be inserted into the side of the end cap for the plumbing.

Wood sides, rigid insulation, and twin wall polycarbonate, with a black absorber behind the polycarbonate sheet.  Ive shown the end cap as translucent to provide an exposed view of  the inside channels which have been cut back  to create a manifold.  The extra strength of the end cap will make the quick connect more secure.   The end caps can either be sealed with an ultrasonic or solvent weld.

The melting temperature of extruded polystyrene is 240F well above the maximum temperature I would expect. 

2" of extruded polystyrene would offer an R-Value of about 10.

For a 4 x 8 collector the polycarbonate should weigh about 18 lbs. and 2" of  extruded polystyrene about 6 lbs.   A wood case is going to be the heaviest part of the panel.  A  4x8 sheet of 1/2" plywood weighs about 48 lbs.  and 24 of 1x4 pine weighs about 24 lbs. for a total of 18+6+48+24=96 lbs.  72 lbs coming directly from the case.

If a case were made of aluminum sheet metal,  I expect it would weigh about 25 lbs less and it would look more professional.  Since I often work alone Im always thinking of weight.


Update 2012.01.22:

I found a some information about experiments using "Black Liquid Collectors" first built by Minardi and Chuang in 1975 which used a heat transfer liquid consisting of 3 parts Prestone II, 2 parts water and 3 grams India ink per liter.  The liquid was translucent, but it absorbed 98% of the incident solar radiation withing the first 1/4".

Minardi and Chuang performed further experimentation with tube spacing and and various additives.  Graphite was found to be the most absorbent.  It was also found that when the tubes were spaced one diameter apart the efficiency improved.  This is thought to be due to the greater angular collection area and the collectors ability to collect scattered light.  Similar results have been noted with Evacuated Heat Tubes.

Twin wall polycarbonate may not have the advantage of increased angular collection area, but the simplicity and cost of this system still makes it an attractive option which I look forward to using.

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Thinking Theoretical economic Anthropology and the Gold star Standard

One of the problems I see in the western world is its dependence on reward.

The internet seems a little better than the real world in this respect, but I suspect its because we dont see the takers doing the taking. We just see the givers being generous. The nature of the stuff up for grabs means that if you take more than you give, theres still exactly the same amount left for everyone else. Open source software is a good example. 

Ive taken much, much, more from the net than I can ever give, but all the stuff Ive taken is still there. 

Which is nice.

But in the real world you take some stuff, and theres not as much left for the next in line. And sometimes there isnt even a line*.  Ive been lucky enough to have spent my formative years living in Papua New Guinea. To say anything about Papua New Guinea is to be wrong about most of it, but Ill say some stuff about it anyway. 

When I was in Papua New Guinea, I was there at a time when the locals were making the transition from the cultures and lifestyles they had been enjoying for the last few dozen centuries, to one that looks and tastes a little more like you might expect in a western city. One of the problems with shifts like this is the clash between the old economic system and the new. From this point is should be noted that when I talk about some attribute of Papua New Guineas culture, I refer to only the bits I know. There are something like a third of the worlds languages (or something) dont quote me)). and many more cultural ... things... paradigms? Anyway. every few hundred people are different. They talk different, they look different, they believe different, and they think different. Not just different as compared to me, but different from all the other different groups. I knew a fishing net merchant who could easily pick a persons birthplace to within a hundred kilometres or so, just by meeting them over the counter. Often with much greater accuracy to the point where they could name the village. Anyway...   One of the most interesting things about the culture clash was the gradual decline in the worth of generosity. Or at least my perception of that decline. There seemed to be some kind of social credit that a person could gain by simply giving stuff away. You might get something back from acts of generosity, but it might not come from the person you gave things to. You still see this in the west in small groups, but once you get to a certain population level, one where everybody can no longer know everyone else, the system breaks down. There comes a point where giving stuff away is no longer useful. 

And here I come to my point...

When youre little, you gain respect and trust within your family and friends, you are rewarded with new responsibilities, freedoms, and smiles. 

You dont need gold stars gummed to your work. 

I think gold stars (or points for Hufflepuff) might be encouraging our kids to seek only monetary reward, or perhaps an Oscar. 

I think we should stop it. 

120 things in 20 years thinks the best part about not being an academic, is that I have no need to quote sources, and I get to say whatever I want. 

*A line has just one characteristic. Its endedness. Two** ends, but just one characteristic. A list of people who can make the most noise from lowest volume to highest could be seen as another line, and often making the most noise gets you first grab at whatevers going. (see baby birds in nests, and political lobbyist)

** a circle is a line with no end. I guess that means I mean a "queue".  

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Epic adventurer Fishing gear theft

Someone stole all my fishing gear from my shed, so the epic adventure has been postponed at least for another year.

Sad.

The only time I really shopped for quality was for my fishing gear. It was the backbone of the trip and had to reliably feed me every day I was away.

I hope whoever stole it cares for it as much as I did over the 6 years it took me to accumulate it.

It was around $500 dollars worth of small, light weight gear (4 lb line) that I had bought over the last 6 years, all based around what I would need to fish all day as I boated along. I bought reasonable quality stuff as I would have limited ability to repair it. Not "real money" quality, because thats way out of my league, but stuff that with a bit of care and maintenance would outlast me.

Now I spend my days wondering if there is any point trying to buy anything else because they will be back.

Even more sad, is the almost certain reality that the person who stole it suffered a desperation for the funds it generated for just that afternoon.

I guess their life probably sucks more than mine.

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Aquaponics The no holes fishtank window

Ive been thinking about adding a viewing window to my fishtank because Im part way through moving and expanding my little system, and now would be a good time.

The new system is going to be a simple CHIFT PIST* with fewer points to go wrong compared to my current system.

The problem with adding a window is that its another point that could fail. The side of the IBC fishtank is flexible, and the glass window is rigid, and that never ends well.

So I thought Id run it through the invention engine and see if there was a safer way.

It came up with something it likes to call the "No Holes Fishtank Window".

Which is nice.



So, it turns out you could probably force an aquarium partially under water from the surface to make an interesting inside-out aquarium.

Its a little reminiscent of Woncos house, "Outside of the asylum".

A better viewing angle would be made from a wedge shaped aquarium made from two squares of glass, and two triangles for sides. One square sits flat against the side of the fish tank (the side you would be leaning against when viewing), and the other sits at an angle of 45 degrees, so that it meets the other square 40cm underwater.

The entire device is mounted on a bracket that keeps it underwater. The bracket is an inverted U shaped bar of stainless steel (stainless steel, so the fishies dont get all dead). One bit of the U is siliconed onto the side of the window, the other end has a locknut to attach it to the frame of your IBC.

It could be easily removed to clean, or to simply add to land fill.

It will probably work, and might look a bit like this...

I might even make one for my boat.

Surprise!

120 Things in 20 years is still alive!



*Constant height in fish tank, pump in sump tank

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Making smoked foods A better way to brine

If like me you have no room in your fridge for a bucket full of meat when youre brining, try putting into an icebox.

Throw some ice in with it and youre set.


120 Things in 20 years  thinks this might be a record shortest post ever.

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Epic solar boat adventurer Stress testing my old battery

Ive had this big old deep cycle battery for years, and I dont know enough about it so I thought Id learn some stuff.

Its a conventional, unsealed, 100ah lead acid, deep cycle thing.

At least I think its 100ah. Thats the kind of thing youd think someone would emboss onto the side rather than adding it as a stamp. That and the voltage.

At least they went to the trouble of embossing the + and - marks.

So with this kind of battery, it seems they dont mind being run down as much as, say... a car battery might. Car batteries hate it when they are run down, and it shortens their lives in a big way.

A deep cycle battery (also called a flooded battery apparently) is a bit more forgiving, but they still see damage with every bit of use. The lower you allow the voltage to get before recharging, the less charge cycles you get from them before they need replacing. 

As I understand it, 11.8v is considered "empty", but thats at rest 6 hours after you stop using it.

I need to know what "empty" is when Im cruising along drawing 20 amps or 35 amps (that being the amount of juice the motor pulls from the battery at speeds 4 and 5 of 5.

So my education for today turned into more questions than answers. It looks like its business as usual.



120 Things in 20 years thinks the Internet might not know something I need to know.

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Epic adventurer Solar boat progress

I made some progress today buy building the frame to hold the solar panel on my little boat.

Not a lot of progress, but a bit.

I was prompted by Dave, a solar panel exporter from China to make some progress, so here is the result.

I made it all out of 25mm aluminium pipe, and plastic plumbing fittings. It should work well enough once I tie or wire it down. I might add some wire tension as well to make sure it all stays where it should.

The best part of my new adult construction kit is that Im able to adjust any of it on the go with nothing more than my hands and some luck.

At some point I plan on building a solar tracker so my panel always points to the sun regardless of where my little boat is pointing.

As a result, I?ll need the design to be flexible enough to allow me to add electronics and some kind of actuators to raise and lower different ends, and sides of the panel.

The basic plan will see me sit at the end with the chair on the right, looking under the solar panel when Im sitting, and looking over the top of the panel when standing. This height gives an unrestricted view when sitting or standing.

When sitting, I wont cast a shadow on the panels even when the sun is setting directly behind me.

The panel will sit on top of the two bars and form the final bit of structure.

That should work.

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Epic adventurer Lifestraw

My Lifestraw was delivered today!

A Lifestraw is a very cool device for personal water filtration. Its guaranteed to deliver 1000 litres of clean safe drinking water from any dodgy water source. The Murray River is one big dodgy water source, so a it fits the bill perfectly.

It looks like this, and weighs almost nothing.

According to the packaging, it does what all the other water treatment methods claim or better.

Apparently, my little Lifestraw removes 99.9999% of waterborne bacteria, 99.9% of waterborne parasites, and provides a minimum of 1000 litres of clean drinking water.

I also bought a PermaNet 2.0 mosquito net that not only claims to keep mosquitoes at a safe distance, but also kills them when they land on it. That means the world health organisation thinks its ok to use me as bait.

Fair enough I guess.

So basically my Lifestraw is a stack of tiny straws crammed into a tube with a sippy cup mouthpiece at one end. You stick the blunt end into a stock trough, or creek you dont quite trust, and drink through the mouthpiece as if it were a gigantic straw, and bam! you keep living.

My PermaNet 2.0 is a mosquito net.

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Epic adventurer Solar fail safe kill switch

Ive been worried about all my dodgy electronics on my solar boat, so I figured I should have a master kill switch that couldnt fail, and came up with a fuse holder and a 6mm bolt, tied to some artfully arranged paracord in the form of a survival bracelet that my brother made for me.

Cut the threaded bit off the bolt, tie a nice grippy paracord handle to it, then put the bolt in the fuse holder that connects all the electrics to the positive terminal.

One pull and everything stops.

It should work.

If it does, I should also be able to clip onto it with with a 2m bungee cord when I want to move around the boat if Im under way. That way if I fall off, the motor will stop. I think its called a dead mans switch. I was originally planning to create one digitally, and I still might if it turns out to be a pain, but if I need it, Ill build it on the boat. If I did it digitally, Id make a simple sonic tape measure with a PICAXE chip that would notice if I left my chair. Then it would beep in 60 seconds, then kill all power to the motor if I didnt wave my hand in front of it within 15 seconds.

I think I prefer paracord and my bolt fuse.



120 Things in 20 years realises a solar deadmans switch sounds like safety overkill, but Ill have junk everywhere, no side rails, and 2000km is a long way to chase a boat moving slightly faster than I can swim on the Murray River.

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Epic solar boat adventurer deep cycle battery performance

I put my sweet looking battery to the test today to see what would happen running the motor at half speed.

Fresh looking isnt it.

I decided to run it on speed 3 of 5 to see what kind of range I might get without any sun.

I should get around four hours of full sun in spring on the mighty River Murray on a fine day.

Or so Im reliably informed.





Much of the country on the lower half of the river is effectively desert so there should be plenty of sunny days.


As I move further upstream (to the right) the weather will get more and more overcast. The beginning of the river is in dairy cow country I think. The middle (shown here) is more like that kind of country thats good for growing a goat... maybe even two goats. A few meters either side of the river is nice (in an Australian kind of way), but this is a very, very old land, and this river has dug out a trench to run through so it could ignore the vast parched land surround it and just on with doing its own thing.

 I have no idea what that being upstream will mean to my levels of sunshine at this stage.

But I wont be in any hurry, so I dont really care.

Todays test involved running the motor, and writing down some numbers every half hour. I also turned the motor off for a minute, then wrote down some more numbers.

Minutes	1	30	60	90
Amp Hours	less than 1	8.71	16.14	23.29
Volts under load	11.7	11.44	10.94	10.36
Volts after 1 minute rest	12.4	12.22	12.06	11.9

After the test I waited an hour and the voltage had bounced back to 12.31v.

I turned it on for another 10 minutes and the voltage dropped rapidly to where it was before the hour long rest.

Final numbers after the additional 10 minutes were 10.36v under load, 12v after a minute rest, and 26.54 amp hours used.

I think what all this means is perhaps my battery might be good enough. Im hoping to keep it almost full all the time with only a small amount of use for a little light.

That should put me within range of humans for 80% of my journey, but there will be a few sections where I might not see people for a few days.

To be honest, I have no idea. 

I hope I dont die!


120 Things in 20 years hopes I dont die.

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Epic adventurer Solar boat trolling motor

I got one step closer to setting out on my zillion mile epic adventure on the mighty Murray river, on my little solar powered boat.

That step included testing just how much juice I was going to need to run the trolling motor, and seeing if the solar panel I have will provide enough.

My boat is a displacement hulled catamaran. That means it doesnt do the skimming across the top of the water thing that most other racing cats do, so its very outdated for racing, but it floats well, and the hulls are very low drag.  At their widest, they measure only 20cm or so. They are 4.2m in length, so they slide through the water without a lot of effort. Probably even slicker than a kayak.

The result of all this is that I can tick along at walking pace with an electric trolling motor on its slowest setting.

I like walking pace.

In fact, aside from jet aircraft pace, and insane motor bike pace, walking pace is my favourite pace.

So I think, the result of all that is that I should be able to power my little boat with my single solar panel. That question has been nagging at me for ages. My solar panel says it delivers a maximum of 230w at 37v and also mentions 7.5 amps or so.  I think that means that at 12 volts after an MMPT solar charge controller, it will offer the battery a maximum of 19 amps. Probably much less.

But...

I just put my trolling motor in a bucket of water (large bucket) and ran it through my multimeter. As far as I can tell, it draws around 12 amps on the lowest speed setting. Ill be taking a 120 amp hour deep cycle lead acid battery. From memory, before I had the solar panel, that battery gave around 5 hours cruising when I ran it down to 11v. But my memory is terrible for stuff like that.

Also as far as I can tell, I think that means I should be able to cruise for a reasonable amount of time each day. Theres also the option of running a bit faster during the middle of the day, when my solar panel is generating the most power. It would be nice to leave the battery with a healthy amount of charge at the end of each day so that I could use some for light, charge my phone and UHF radio, and to power a laptop so I can get some blog posts out.





Ill probably want to set up camp each afternoon when there is still plenty of light, and get up early each morning to pack up camp and get under way when the river is at its best. If I leave a full battery at the end of each day, I should be able to set off at first light, and then make up the charge by the end of the afternoon.

Or something.

But I have no idea how this will all pan out in the real world.

What I need is a 36v to 12v MMPT solar charge controller that actually works, and wasnt sold to me fraudulently by that trader on E-Bay.

Now I dont trust the world any more.

But Ill probably get over it.

But on the up side I now know how much current my little trolling motor draws, and Ive also found a brand new way to inject a lot of oxygen into my fish tank very quickly, and perhaps mince fish.

Which is nice.

This is the trolling motor on its highest speed setting.

Excited water.







120 Things in 20 years thinks its found the worlds fastest way to empty a large bucket of water all over itself and its shed, without actually picking it up and tipping it over itself.

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Epic Adventurer Solar Boat Bullwinkle III

I made some progress.

Actual progress!

I have a plan, some drawings, and newly found personal temperature control.

Which is awesome.

If you havent had personal temperature control for a decade or so and then you get it, its pretty much the most wonderful thing you could imagine.

I no longer need ice packs under my hat and in my pockets.

Awesome.

Yesterday I was cold for a bit.

Awesome!



120ThingsIn20Years... No really - Awesome!

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Epic adventurer New solar panels

Bullwinkle III is about to be born.

Bullwinkle was the first incarnation of my little boat. It was originally a SunDance 4.3m one man racing catamaran.

I went halves in it with a friend.

It was old and slow but built solidly.

We broke it.

We fixed it up, but it wasnt strong enough to put it under the kind of strain that a boat sees when its under sail, so the sail had to go.

I put a 1.8m square of marine grade plywood on it and turned it into a fishing barge. I added a large deep cycle battery and an electric trolling motor. This gave me a range of around 6km which is surprisingly enough to catch lots of fish and more importantly, lots of blue swimmer crabs. This incarnation was Bullwinkle II. With the aid of some rope, and some plastic hand reels as pulleys, two empty milk crates as seats, and a pram wheel as a steering wheel, it was quite comfortable. the only downside was that people kept boating up to us to see if we needed help because we looked like a sinking dingy. A sinking dingy with two people standing on it fishing.

Then came Bullwinkle II.V which was essentially the same as Bullwinkle II but it also had a 3hp two stroke motor, but that was just annoying.

So today I spent the money Ive received from you nice people clicking my blogs ads on two new 180w solar panels. They have apparently been built, and are now being put on a ship in China.

Thanks clickers.

Thanks China.

Thanks boats.

So now I can finally build Bullwinkle III.

I have the hulls, the decking, a motor, the frame of my 1.8m grow house (the one that let the sun dissolve its cover), and an office chair.

That should be plenty enough junk to solar boat the length of the mighty River Murray.


120 Things in 20 years just remembered that I hadnt ever gone camping alone, so the night before last I drove to the river with my swag, and tried it. Nothing bad happened.

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Thinking Solar photovoltaic panels Epic boating adventure Lunacy

I looked away for a bit, and while I wasnt looking the world notched over to complete lunacy.

I bought a solar charge controller that was advertised as being able to accept voltages 12v-40v.

That was nice because my solar panel is 37 volts.

But when I opened it the docs inside said it was good for 12v-20v. I complained and eventually the internationally known E auction site gave my my $70 back, but I had to pay $30 for the return postage.

I sent it back to China.

Today I just got it back in the mail.

Apparently they didnt bother to collect it or they dont really live at their stated address.

So far its travelled 20,000km.

The world is an amazing place.

And a completely loony one.

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Epic adventurer Solar boat Nobility of metals and becoming unhinged

So...

 Im building a framework to hold some solar panels to power me the length of the mighty Murray River, and I figure I should mount the entire assembly on hinges so I can lift one side at a time to add the extension tubes to raise it up high when Im on a long trip so I can use the space under it to sleep or whatever.  

The panels were originally going to be mounted on hinges as well so I could tilt them to the sun as required, but I figured Id keep it simple and see how much cruising time I have per day without moving them. I can always add hinges later.

One of the problems I have is that Im using three or four different metals in a potentially salt water environment. 

Metals hate that kind of thing. 

They have a problem with nobility. 

It turns out that if you arrange a stack of metals in a particular order based on something called their nobility, and you pick some that are a decent distance away from each other on that list and try to build a boat out of them, you get a battery, and some stress.

I already have the stress, and the battery doesnt even exist yet. 

And by the way. Wherere not talking about some awesome battery that will be useful, but the kind of battery that used to be around in the 70s in your transistor radio left in a cupboard in your room, and that was left un-attended for too long and decided to go all acid all over the shop and make your mum angry because you didnt own clothes any more. It seems when you stick two metals that are far from each other on this table of noblenessso they touch each other, and then wet them with some electrically conductive liquid...say... salty water, they get all crazy and dissolve each other and basically ruin your boat. 

Sometimes ruining your boat includes letting go of solar panels while youre driving to the water at high speed, and that is the very thing Im trying to avoid.

I have stainless hinges, painted iron grow house tubes for a frame, nickel coated nuts and bolts, and aluminium frames on my solar panels. 

Lucky me!

I bought some rubber grommets because the guy at Bunnings told me to, and said everything would alright. He was the one who sold me the hinges, the nuts and bolts, the grow house (two years before) and all the tools I needed. He was very reassuring. 

But just in case he had no idea what he was talking about, I paid some drunk guy with a boat shaped voodoo doll to make everything better, so I should be good. 

At least he claimed his boat shaped thing was a voodoo doll. 

Whatever.

Im sure everything will be fine.




120 Things in 20 years needs all the magical help it can get to prevent becoming unhinged, and/or zombieism.

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Winner The great MPPT solar charge controller competition

So I asked the invention engine what kind of competition I should hold to give away that first solar charge controller I bought, and it said I should ask everyone else.

Helpful.

It said I should get a load of people to submit their ideas.

I asked it why people should spend their precious time helping me out with their ideas.

It said I should provide some kind of incentive.

Like a competition.

So the first ever 120 Things in 20 years competition is as follows...



Whoever can come up with the best idea for a competition wins.

The prize is that solar controller I had so much trouble with because it didnt match my solar panels too high voltage.

There is only one rule*, and that is the winner wont be anyone who enters by simply adding another layer of competition to the competition to see what the competition should be.

I already thought of that one, and Ive decided I probably wont give the prize to me, although I am currently in the lead so I may change my mind.



Mrs 120 Things and I will judge the winner at our own discretion, in our own time, whenever we feel like it, if we feel like it, and reserve all rights to do whatever we want without reservation or regard for others.



120 Things in 20 years thinks the invention engine may have just gained consciousness, or at least the beginnings of a consciousness-free sense of humour.



click the comments thingy to enter or offer derisive laughter

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Winner The first 120 things in 20 years competition

So a while ago, I bought a MPPT solar charge controller.

It turns out the nice ebay based company I bought it from was a fraud, and sold me a product that wouldnt work with my solar panel in spite of my having asked them and then double checking. My solar panel had too high a voltage, but the listing said it would be fine.

Anyway...

The result was that I was sent a product that didnt work as advertised.

Eventually ebay made them give me my money back. The company insisted I return their product at my expense.

I posted it to their registered address, but the post office in China said there was nobody by that name at that address.

So China Post returned it to sender.

Me.

All this is old news to anyone who follows this blog, but this is the new bit.

I thought Id give it away because its of no use to me, and might be exactly what someone else wanted. But who to give it to?

I thought Id hold a competition, and give it to the winner, but I cant think of a decent theme.

The current plan for the first ever 120 things in 20 years competition is to run it through the invention engine and see what it thinks.

so... stay tuned I guess. Its late, and Im going to bed.

Tomorrow, the competition begins!

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Epic solar boat adventure Extension poles

Part of the latest design plan is to be able to raise the solar panels when my little boat is going on an epic adventure, rather than just a day trip.

During transit on the tralier, I want my solar panels as close to the deck of the boat as I can make them so they dont fly of in a direction of their choosing. I want them to be a little more under my control that the wind might, so keeping them low means I get a bit less wobble. If you dont know what Im talking about, get a neighbours kid (dont use one of your own) and see how much more they move about if you lift them up high on a post.

Thats physics at work.

Or something.

But anyway, if you built a carport on 300ft long broomsticks, it would fall over in the first stiff breeze. But the same carport would hand it just fine if the broomsticks were only 4 foot tall. (I presume you drive a Ferrari)

So I want my solar panels to sit atop their low rise roof in 110 kph transit, but be extended to a more convenient height when Im on an epic adventure. I dont mind stooping a bit to get under cover, but it will drive me nuts if I have to crawl under the panels if I ever need to sleep on board.

So..

The in the low rise version (road transit, and day trips) the solar panels will sit at around 400mm high.

In high rise mode, they will sit at more like 1200mm high.

In order to move from low to high mode, I figured Id mount the entire frame on hinges so I could add the extension tubes first to one side, and then to the other by lifting the frame with one hand and adding the extension tubes with the other.

But I have a problem. I cant wrap my head around Newton and his pesky rules...

If I mount a 1.8m cube of grow house frame so that all four of its legs are hinged to enable it to tilt around an axis running front to back of the boat, will it fall down, or will its integrity be maintained by the structure of the top.

I realise the answer is going to start with "it depends", but arggggh!.

I want my old brain back.



120 Things in 20 years wants to start using the invention engine again. Its always worked much better than this brain thing.

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Epic solar boat adventurer Watt meter

Not so long ago I bought a watt meter online and it arrived as described.

I love it when that happens.

The best part isnt that it actually works, and works as advertised (which IS nice), but it tells me my Epic Solar Boat Adventure might actually work. 

I have 360w of solar, and it turns out my motor draws about that same amount of juice when running flat out. 

Hopefully that means I can cruise for a few hours a day at speed  4 of 5 on a sunny day, and still end the day with a full battery in case of snake bite, internet use, phone use, wanting to shine floodlights into the eyes of the local wildlife in that way that we humans tend to enjoy... whatever.

In all these years, Ive never really known how much power my trolling motor uses on full power. My multimeter couldnt handle the amperage my motor draws, so I only knew the values for the first 2 of 5 power settings. 

Today is a happy day.

My trip is going ahead.

This stuff is going to work!

120 Things In 20 Years is a little surprised that the math(s) worked

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