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Show HN: $200 Solar Self-Sufficiency Without Your Landlord Noticing

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Re: Show HN: $200 Solar Self-Sufficiency  Without Your Landlord Noticing

#161
post #63
post #54

Please bolt the panel down, if wind picks it up and blows it off the roof it could easily kill someone.

I really doubt the wind is going to pick up a 2'x4' ~20lb panel like that when it's flat on a roof. Now if he had lifted an edge to try and get a better angle with the sun that would IMO be a much larger issue.

You've never seen a panel dismount itself through wind force only.

Re: Show HN: $200 Solar Self-Sufficiency  Without Your Landlord Noticing

#162

Earlier quoted context omitted.

I think you might mean solenoid?? It's controlled by the ignition. When the key is on / car running both batteries are in parallel. When the ignition is cut, the solenoid isolates a few circuits that are wired on the backup battery side of the solenoid. This is what I have in my vanagon. I run the radio, fridge, interior lights and some 12v / USB outlets. http://www.gowesty.com/product-details.php?id=2418

I've always known it as a battery isolator, and have purchased/installed 3 of them, and that's what I bought them as. https://en.wikipedia.org/wiki/Battery_isolator https://www.amazon.com/NOCO-IGD140HP-140-Battery-Isolator/dp...

AKA a variable split relay, VSR. Use one in our campervan, still haven't made the upgrade to solar for longer stays where you don't want the engine on, but it's good to keep the leisure battery topped up.

Re: Show HN: $200 Solar Self-Sufficiency  Without Your Landlord Noticing

#163
post #104
post #102

Earlier quoted context omitted.

Funny that we live in a world where one renewable energy source is powerful enough to (literally) blow away another.

Right which is why I believe that after the coming consumer solar revolution there will be something similar with wind energy. Especially with newer VAWT designs and areas that have a lot of wind. They compliment each other so wind can continue producing at night.

For anyone curious, a VAWT is a Vertical-axis wind turbine (https://en.wikipedia.org/wiki/Vertical_axis_wind_turbine). I always thought these were less efficient than the conventional designs but they're clearly simpler.

Re: Show HN: $200 Solar Self-Sufficiency  Without Your Landlord Noticing

#164
post #33

I built a very similar system into my Jeep-house. I have two 100W panels on the pop-top roof, a charge controller and a dedicated solar battery (isolated from the engine-starting battery) that runs my fridge, water pump, UV treatment lamp, interior lights, air compressor and charges all my electronics (laptop, kindle, cameras, etc.) directly from 12V DC. I can leave the Jeep parked without running the engine for days…

Most modern motor-homes I've seen/used have a solar panel for trickle charging the leisure battery.

Some other good examples of retrofits here: http://www.goalzero.com/solarlife/stories/en-route/

Re: Show HN: $200 Solar Self-Sufficiency  Without Your Landlord Noticing

#165

I find the title kind of click baity, "$200 solar self sufficiency for my bedroom" would be more accurate

Hey. You're completely right :) My original title was was "Solar Self-Sufficiency for Renters", but my mates in marketing told me to clickbait it the f up. Would you have clicked on the former, though?

Your "mates" can f right off. It debases an otherwise very interesting article. If you're interested, here is another similar setup that went entirely DC http://www.lowtechmagazine.com/2016/05/how-to-go-off-grid-in...

Re: Show HN: $200 Solar Self-Sufficiency  Without Your Landlord Noticing

#166
post #139

Earlier quoted context omitted.

Because men love electronics projects and women love keeping a tidy house and ruining their dreams, am I right?

> Because men love electronics projects and women love keeping a tidy house and ruining their dreams, am I right? I don't think this is accurate. Personally, I've had a lot of trouble finding people of either gender who are interested in electronics. I might be overstepping here, but it sounds like maybe you should talk to you wife and see what can be done to minimize the negative externalities caused by your hobby?…

I believe bonniemuffin was being sarcastic.

Re: Show HN: $200 Solar Self-Sufficiency  Without Your Landlord Noticing

#167
post #112

Earlier quoted context omitted.

First, there are no hurricanes or tornadoes in that area. So, you can work out max wind via historical data, but 85MPH is not going to be enough to move it over that lip. The skin effect around a building drastically reduces the forces involved.

You aren't accounting for a million other things that can happen.

I have no problem saying bolting something to the roof is a good idea, I just don't think the wind in that area is going to lift that specific object. Move sure, lift no.

So, saying any if the actual significant reasons to bolt it does haze zero influence on my objection.

Re: Show HN: $200 Solar Self-Sufficiency  Without Your Landlord Noticing

#168
He mentions fridge/freezer - I'll just draw attention to this project[0] where the smart guy uses a chest freezer as a fridge with an external thermostat. It has better insulation and design (cool air stays in when open), so ends up much more efficient and can be run on minimal power. Just 90 seconds of run time per hour.

There are other ways to do this in mobile setups, or with inverters in any setup, using mini-freezers, simple electronics to turn the inverter on/off and a small panel. See /r/vandwellers[1].

[0] - https://www.treehugger.com/kitchen-design/man-retrofits-free...

[1] - https://www.reddit.com/r/vandwellers/search?q=freezer&restri...

Re: Show HN: $200 Solar Self-Sufficiency  Without Your Landlord Noticing

#169
post #33

I built a very similar system into my Jeep-house. I have two 100W panels on the pop-top roof, a charge controller and a dedicated solar battery (isolated from the engine-starting battery) that runs my fridge, water pump, UV treatment lamp, interior lights, air compressor and charges all my electronics (laptop, kindle, cameras, etc.) directly from 12V DC. I can leave the Jeep parked without running the engine for days…

A question: How much did the solar aspects of your rig cost? And a comment: You might want the ability to tap your solar battery to start the Jeep, if you're going to leave it parked that long.

The setup did not cost much. A couple of hundred for the panels, a hundred or so for the charge controller and a couple of hundred each for the two batteries.

I have an isolator so I can jump the Jeep from the solar and visa versa. Wiring details here: http://theroadchoseme.com/diy-jeep-wrangler-jk-isolated-dual...

Re: Show HN: $200 Solar Self-Sufficiency  Without Your Landlord Noticing

#170
post #72
post #33

I built a very similar system into my Jeep-house. I have two 100W panels on the pop-top roof, a charge controller and a dedicated solar battery (isolated from the engine-starting battery) that runs my fridge, water pump, UV treatment lamp, interior lights, air compressor and charges all my electronics (laptop, kindle, cameras, etc.) directly from 12V DC. I can leave the Jeep parked without running the engine for days…

I can't remember how I did it specifically, but I believe there's a way to wire up a second battery to your alternator where it only charges it, and your vehicle will never draw from it. Could be a way to keep it topped off while cruising around.

I have exactly that! Here's my setup in more detail: http://theroadchoseme.com/diy-jeep-wrangler-jk-isolated-dual...
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