I have been recovering single cells from recycled lap top batteries. The cost is mostly sweat,  and each cell is 10 watts at 4 volts. I plan to stack six for 24 volts at 60 watts.  I have over 700 cells now, and I want 2100. Here in one trip to the computer store:

![20180322_124258.jpg](https://cdn.steemitimages.com/DQmRk2BN9xZEtAazs9GQm4TsTHYqRGWLNrSdZ2Z9gkBNxn5/20180322_124258.jpg)

The operating life of LiIon batteries in 30 plus years, where lead acid is 5. The fork lift battery is a good choice,  they are deep cycle. You might look at a Tesla car battery pack, they are upgrading some right now to bigger cells,so some are surplus.

Mother Earth has a lot on Earth Batteries. Basically, pipe is buried about 4 foot deep, with a long run. The pipe receives ground temperature,  and air is circulated. This temperate air is used to heat or cool. 

I posted an article on energy scavenging a few days ago,  good information.

Peltier modules are a fun toy. I have designed them into equipment several times. They are impressive,  but their efficiency is low. 3 amps at 12 volts will get you about 150 btu, but they will run forever!  The Russians use them to make electric power from heat.  I may play with that myself, after the build is finished.

I will have to use Styrofoam,because the mice in the country love insulation they can nest in. I am adding a 2 inch foam sheathing wall inside the mobile. That allows me to totally replace the inside walls too. 

I have to remove a black walnut tree to place the shop. It is about 28 inches dia., and I will have it milled and dried for kitchen cabinets. 

The shop walls were going to cost me $2000 per side. The containers will be $3300 per unit, so for $2600 difference, I get two 8 by 40 storage spaces.