I have 18 LFP cells in series, connected to a Multiplus-II 48/5000/70-50, but have not installed solar PV yet. I'm trying to fully charge the batteries but unsuccessfully. It seems that both Scheduled Charging and Keep Batteries Charged only use the "Float" setting without going through the cycle "Bulk -> Absorption -> Float". What seems to be happening is that at the Float voltage (60.3V for my system, 3.35V per cell), the charging current quickly decreases and the battery does not go higher than 68% SoC (as calculated by the SmartShunt that is also installed in the system).
Is there a way to force the Multiplus into Bulk charging mode?
Maybe this is a problem with my settings, here is a summary (values in parenthesis per cell). Please let me know if more information is needed:
- DC Input Low Shutdown: 52.0V (2.88)
- ESS Cut-off Discharge: 54.0V (3.00)
- Absorption: 61.2V (3.40) 2h time
- Float: 60.3V (3.35)
- ESS Sustain: 60.3V (3.35)