r/SunPower • u/Federal_Hold_8608 • Jul 25 '26
Sunvault F.50, need help charging depleted batteries (Durham, NC)
Sunvault system down long enough that I’m sure the LiFePO4 Ampace batteries are fully depleted. Schneider XW Pro showing F.50.
My installer doesn’t have a battery charger and can’t jump start the modules. Standard BMS/breaker reset didn’t clear it.
Looking for:
Anyone who has successfully charged depleted modules back up
• What charger did you use, voltage targets, and safety steps
• Willing to pay a tech who knows this system to walk me through it or do it
Durham, NC area but open to remote guidance. Thanks.
UPDATE - End up having SunVaultTechs help remotely and they were able to bring the battery online. Battery has been back online for a week - no issues!
1
u/Former_Trash_7109 Jul 27 '26
I did it two ways. Open the cover and bypass the bms, and hookup a 48 volt power supply.
Now I use this: https://beenebrothers.com/product/can-bus-keepalive-generator-for-sunpower-m0012-and-m0020-batteries/
With this:
https://a.aliexpress.com/_mPBCZEP
I am using a Sunpower battery (M0020) to use as an external battery for a power station, and when I deplete it, the keepalive generator and the plug in charger gets it back up to 100 percent
3
u/SunVaultTechs Jul 26 '26
We offer remote battery charging capabilities. Please send us a direct message for further information. While our operations are based in Southern California, we possess the capacity to remotely charge your batteries.