48VDC LiFePO4 pack with TS45 and Victron 385W 48VDC inverter

[jwrgorman]

I have a 900W of PV connected to a Morningstar TS45 (PWM) charge controller connected to a 48VDC pack made up of (4) 12V LiFePO4 batteries in series. Also have a 48VDC 375W Victron inverter attached to this battery bank for AC loads. It was working fine, but possibly it is a set of very sunny days but the Low Voltage Disconnect (LVD) feature which is enabled now seems to keep triggering a lot. does anyone have advice on the TS45 settings to avoid this? Thanks

[SunEagle]

It is possible the your PWM charger is not providing enough amperage to charge your battery pack which may then be discharging. Based on that chart you barely get 3 charging amps which seem very low for 900W of panels.

[jwrgorman]

Thanks SunEagle yes OK I can tell that the PV voltage is floating very high now (~110VDC) rather than coming down to the nominal battery voltage (55VDC) when charging where it used to go to 6 Amps (before the batteries got full). theTS45 thinks the battery is full maybe? I am using the battery sense terminals as well - maybe that is confusing it.