This is the cheapest prebuilt battery for 48 volt off grid powerwalls. At only $300/kwh nothing else comes close. This is a LiFePO4 battery, prebuilt from the factory with a BMS, circuit breaker, all in a beautiful case. It's ready to go to work with your powerwall and off grid solar system. No need to add a BMS. It's rated for nominal 51.2v so it works with normal 48v equipment (inverters and MPPT charge controllers). This is the Gyll brand sold by Signature Solar. It's 100ah, 5,120wh. That's over 5.1kwh per battery!

Retail price as of this video is $1,500, which is less than $300/kwh.

Update: There is no longer a discount code available.

In the video I do a full capacity test. I test the BMS for overcurrent protection, and overvoltage protection. Finally I connect the battery to my computer to see what can be read.

Overall, I'm very impressed with the build quality of this battery. I think it's the cheapest at $300/kwh. I haven't seen any other 48v LiFePO4 batteries (prebuilt with BMS) come close to this price point.

Amazon Affiliate Links:

Resistor used to precharge inverter: https://amzn.to/30lgg4c

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Affiliate Links:

Growatt 5000W Inverter with 450V MPPT Charge Controller 5000ES: https://signaturesolar.com/growatt48...

AutoTransformer, 5000ES: https://signaturesolar.com/growatt5k...

EG4 Battery, 48V, 100Ah, 5.12kWh, LiFePO4, Server Rack design: https://signaturesolar.com/shopall/b...

Waterproof EG4 battery: 48V LiFePO4 Lithium Battery with Bluetooth, EG4 Brand: https://signaturesolar.com/eg4wplit...

Disclaimer:
My videos are in no way intended to be instructional "howto" lessons. I am simply documenting my project for informational purposes. Property damage, personal injury, or death may result, even when following manufacturer's instructions. I cannot be held liable for such damage or injury. It is YOUR OBLIGATION to ensure that you are complying with any local and federal laws as well as code and permit requirements.

David Poz, LLC