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Xringer · 03-30-22, 09:50 PM

To replace my old LA battery bank, I used three 48v packs from Big Battery. Kinda like these.
https://bigbattery.com/products/kit-...-120ah-6-3kwh/
In nice steel boxes.

The system is intended for short term back-up in the event of grid failure.
The normal inverter(Xijia 3000W) load is only about 300 watts.
If it's sunny, the 600w PV runs cool, and the bank isn't used much.
The bank does discharge a little when it clouds over, but charges right back up.
Sooner or later, the sun always comes around..
I did get a new (modern) FIOS box installed, and it seems to use less power.
That means slightly longer run times will be possible at night, and take less recharge time.

Most of the sunny days, 99% of the PV available output isn't used. Since the goal was to be able to power sump-pumps to keep the basement dry when the grid was down, I never expected to use the back-up power for things like the upstairs refrigerator & TV etc.

03-30-22, 09:50 PM	#5
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	My 48v back-up bank To replace my old LA battery bank, I used three 48v packs from Big Battery. Kinda like these. https://bigbattery.com/products/kit-...-120ah-6-3kwh/ In nice steel boxes. The system is intended for short term back-up in the event of grid failure. The normal inverter(Xijia 3000W) load is only about 300 watts. If it's sunny, the 600w PV runs cool, and the bank isn't used much. The bank does discharge a little when it clouds over, but charges right back up. Sooner or later, the sun always comes around.. I did get a new (modern) FIOS box installed, and it seems to use less power. That means slightly longer run times will be possible at night, and take less recharge time. Most of the sunny days, 99% of the PV available output isn't used. Since the goal was to be able to power sump-pumps to keep the basement dry when the grid was down, I never expected to use the back-up power for things like the upstairs refrigerator & TV etc. Attached Images __________________ My hobby is installing & trying to repair mini-splits EPA 608 Type 1 Technician Certification ~ 5 lbs or less.. Last edited by Xringer; 03-31-22 at 05:04 PM..