I've seen a number of threads concerning Tesla batteries, but I wanted to start a new thread that focuses specifically on the details of constructing an off-grid system for charging the model3. Will has a few youtubes about this, but I couldn't find anything definitive.

I should say that I'm a novice at this stuff. I put an off-grid on my shed that's working well. But that's about it. As I understand it, we should first know how much power is required for a Level 2 model 3 charge. I believe this is about 240v at 80amps -- around 17-19kW. I used Battle Born batteries for my previous project, and that seems to be working out (expensive). A 48v battery array seems reasonable, with a 24v set of panels in series to charge, and a couple of split phase inverters.

If someone could help me to zero in on this I would appreciate it. Although I would like to have Level 2 charging, I don't necessarily need to meet the 53 miles/hr (or whatever it is for typical grid-tie 240v charging), as long as it all works.

How many batteries would I need?

How many panels (24v, 200amp) to charge the batteries?

I can do the math, but I'm wondering about alternatives (not grid-tie) or different options.

I should say that I'm a novice at this stuff. I put an off-grid on my shed that's working well. But that's about it. As I understand it, we should first know how much power is required for a Level 2 model 3 charge. I believe this is about 240v at 80amps -- around 17-19kW. I used Battle Born batteries for my previous project, and that seems to be working out (expensive). A 48v battery array seems reasonable, with a 24v set of panels in series to charge, and a couple of split phase inverters.

If someone could help me to zero in on this I would appreciate it. Although I would like to have Level 2 charging, I don't necessarily need to meet the 53 miles/hr (or whatever it is for typical grid-tie 240v charging), as long as it all works.

How many batteries would I need?

How many panels (24v, 200amp) to charge the batteries?

I can do the math, but I'm wondering about alternatives (not grid-tie) or different options.

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