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diy solar

diy solar

Getting a 20' Shipping Container

I went starting from the ground going up, 2” xps foam Then a softer closed foam pad, then heating elements taped with kapton tape to bottom of aluminum 4mm sheet then batteries on top. The second soft layer of foam was there to trap heat against the aluminum forcing it to go up while spreading on the sheet at same time as well as protect wiring of pads and pads from damage. Then two aluminum plates one per long side to act as compression with springs and threaded rods with heating pads taped to outside of this as well. One 48 volt pack gets a total of 16 heating pads all wired in series it spreads out heat with no hot spots and no controllers needed (tried various wiring schemes, I kept burning controllers, relays and even buck transformers…) Ali Baba is just full of garbage unfortunately.

Wired in series no vontroller, relays and even or transformer needed. Battery go between 10c and 20c daily with no controls and power used is 1-1.3 amps or 50-75 watt hour at 54 volts. So 600-850 watts for heating each day (per pack) between sunset to sunrise. Not an issue for a 75 kW bank (21 x 2 and 33 x 1)
The foam underneath makes sense but im looking at 2 x monoblock 24 volt batteries for my build & with the milder temps in the outbuilding, maybe something with lower watts??? Im also thinking about the summer & maybe adding a fan or two to the battery box, or even an ice container ??? There are some really good write ups on here, one about a camping trailer build that has drawings & specs.
 
The foam underneath makes sense but im looking at 2 x monoblock 24 volt batteries for my build & with the milder temps in the outbuilding, maybe something with lower watts??? Im also thinking about the summer & maybe adding a fan or two to the battery box, or even an ice container ??? There are some really good write ups on here, one about a camping trailer build that has drawings & specs.
What do your temps run in the summer?
 
I have been binge watching videos about aerated concrete blocks how they have a much higher R value thinking of building something like this under my solar panels. Reading that some European countries now build 60% of their new homes out of AAC (Autoclaved Aerated concrete) blocks. The main problem here is the heat less power it takes to keep things cool the better.
 
I went starting from the ground going up, 2” xps foam Then a softer closed foam pad, then heating elements taped with kapton tape to bottom of aluminum 4mm sheet then batteries on top.
Do you remember what type of soft foam pad you used? Is this similar to what people use under heated floors? Home Depot sells pads that are 6mm thick and I’m wondering if this would be enough to protect the heat pads when placed under a 40lbs battery. I wonder if it’s worth building a base to not have the batteries sit all of their weight on the heat pads.
 
Do you remember what type of soft foam pad you used? Is this similar to what people use under heated floors? Home Depot sells pads that are 6mm thick and I’m wondering if this would be enough to protect the heat pads when placed under a 40lbs battery. I wonder if it’s worth building a base to not have the batteries sit all of their weight on the heat pads.
It was about 6-8 mm and stiff but obviously softer than the XPS just enough give that it molds to the shape of the silicone pads and wiring and yet stiff enough that it does not go totally flat…. My cells are 400 ah Winston’s so the are like 2.5 times the size of your normal eve cells
 
What's the electrical insulator between the aluminum sheet and the batteries?
Edit: Doh, you use Winston cells, with a hard plastic case.
Yep people with eve cells etc., will need to put down a thin plastic sheet to avoid metal on metal with the aluminum prismatic cells
 

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