EcoRenovator - View Single Post

NiHaoMike · 01-03-17, 09:18 PM

I'm building my own "mini Powerwall" and doing the research, if you're planning to actually use it (as opposed to just let it sit near full charge most of the time), the most cost effective are Nissan Leaf batteries. Limit charge to 4.0-4.1V/cell and discharge to 3.0-3.2V per cell to optimize for lifetime. Limit charge rate to 1C or less most of the time, which in practice is a lot.

Balancing circuits are commonly available on the RC market but high current chargers and inverters that can deal with the oddball voltages aren't. I'm hacking a server PSU into a charger and the inverter is also a modified unit. There'll also be a few DC/DC converters for powering electronic loads directly (including Quick Charge 3.0 support) and some sort of Wifi/Bluetooth interface for remote control.

01-03-17, 09:18 PM	#5
NiHaoMike Supreme EcoRenovator Join Date: Oct 2008 Location: Austin, TX Posts: 1,154 Thanks: 14 Thanked 257 Times in 241 Posts	I'm building my own "mini Powerwall" and doing the research, if you're planning to actually use it (as opposed to just let it sit near full charge most of the time), the most cost effective are Nissan Leaf batteries. Limit charge to 4.0-4.1V/cell and discharge to 3.0-3.2V per cell to optimize for lifetime. Limit charge rate to 1C or less most of the time, which in practice is a lot. Balancing circuits are commonly available on the RC market but high current chargers and inverters that can deal with the oddball voltages aren't. I'm hacking a server PSU into a charger and the inverter is also a modified unit. There'll also be a few DC/DC converters for powering electronic loads directly (including Quick Charge 3.0 support) and some sort of Wifi/Bluetooth interface for remote control. __________________ To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...