NomNomCameron
New Member
- Joined
- Mar 25, 2020
- Messages
- 28
I finally received 8 3.2v prismatic lifepo4 that I ordered from alibaba. They were advertised as brand new 280ah cells.
They came in good shape, terminals look clean, there's a barcode on each of them. They were also all matched at 3.3v
I have them all wired in series and have been running a few capacity tests at really low c rates (~10 amps) and the shunt that I'm using continues to show only 30ah once the inverter turns off??
I have the inverter low voltage shutoff set to 10.5v. When the inverter shuts off the shunt shows the batteries recover to about 22v, which seems within a reasonable range for voltage sag?
I charge the batteries (either with solar or the inverter/charger) to 28-29 volts before I start the capacity test.
I'm currently waiting for my BMS to come in the mail so there is no BMS in use at the moment. I've just been monitoring all the cells manually to make sure that they all stay the same voltage (which they have to about .1v)
This is the first lifepo4 pack I've ever made so I'm really hoping there's just something silly going on that I'm totally missing because even if these were really used cells I would anticipate AT LEAST 150-200ah out of 280ah advertised cells.
Any help on this would be awesome, thank you so much!
They came in good shape, terminals look clean, there's a barcode on each of them. They were also all matched at 3.3v
I have them all wired in series and have been running a few capacity tests at really low c rates (~10 amps) and the shunt that I'm using continues to show only 30ah once the inverter turns off??
I have the inverter low voltage shutoff set to 10.5v. When the inverter shuts off the shunt shows the batteries recover to about 22v, which seems within a reasonable range for voltage sag?
I charge the batteries (either with solar or the inverter/charger) to 28-29 volts before I start the capacity test.
I'm currently waiting for my BMS to come in the mail so there is no BMS in use at the moment. I've just been monitoring all the cells manually to make sure that they all stay the same voltage (which they have to about .1v)
This is the first lifepo4 pack I've ever made so I'm really hoping there's just something silly going on that I'm totally missing because even if these were really used cells I would anticipate AT LEAST 150-200ah out of 280ah advertised cells.
Any help on this would be awesome, thank you so much!