10kWh portable Tesla generator

[sed6]

Like many here I've just started dabbling in solar. My first purchase was the two Tesla batteries for about $1,100 each shipped. I grabbed the REC 260W panels on Ebay for $60 each. To that I added a cheap 2kW Pure Sine wave inverter and a 40A MPPT charge controller. A couple of 250A breakers to protect the batts from the inverter and a 50A breaker from the charge controller.



I initially I wanted something portable, hence the dolly. But it's getting ungainly and the soon addition of a grid tie inverter will necessitate a redesign. Thus far over a couple of overcast days those panels have produced well!



And over 900w when we had a sunny streak for a few minutes! As you can tell my panels are wired 2S2P and batts 2P.







More to come. Hope you like.

Scott
OKC, OK US

 

[Will Prowse]

Nice job!!! Any plans to add a dedicated BMS? What are you using for LVD?

 

[sed6]

Nice job!!! Any plans to add a dedicated BMS? What are you using for LVD?

Thanks! I'm researching Chargery stuff but I'm doing without a BMS for now. I've only got 1k panels so about 5kWh a day. I'm going to be using the LVC in my MPPT to drive a relay. I'm going to use the load as a timer (5 hours at night) and as my LVC. For now.

 

[L-P-G]

That's quite a bit of voltage to each cell bank. 57.6/12 = 4.8v which is much higher than Li likes to go, just something to keep in mind.

 

[jasonhc73]

Put it all on a small trailer!

 

[sed6]

That's quite a bit of voltage to each cell bank. 57.6/12 = 4.8v which is much higher than Li likes to go, just something to keep in mind.

Not sure what you mean? I don't have 12 anywhere. That 56v is the power from my panels going into the MPPT, which then charges the 24v battery using Will's recommended Tesla battery charge settings.

This project was short lived. I'm going to disassemble everything and create a power wall. 130+ pounds just isn't very portable. With my panels now mounted on my roof the portability of it all is moot. Keep an eye out for my new power wall thread!

 

[Supervstech]

Will you be hanging the banks directly on the wall, or in a steel fire rated enclosure?

 

[Supervstech]

That's quite a bit of voltage to each cell bank. 57.6/12 = 4.8v which is much higher than Li likes to go, just something to keep in mind.

Note the PV indicator on the screen. That is the MPPT input voltage, not the battery charge voltage.

 

[sed6]

Will you be hanging the banks directly on the wall, or in a steel fire rated enclosure?

I think straight on the wall. Part of the appeal to this powerwall will be the Tesla battery cells on display.