I have a 3KW/48V Off-grid Growatt Inverter with a “dumb” lithium battery (48V/50AH). This is working great for as a big UPS. The Lithium battery is built using 16x50AH Lifepo4 Cells in Series with a 60A/16S BMS (bought from Lithium Batteries SA). Unfortunately this is not a Smart BMS, so the inverter is set up with a User Defined Battery with Charge, Float Charge and Low Voltage levels set separately.
Adding Solar Panels I have noticed when setting to Solar First on the inverter that the Solar Consumption is way less than the total consumption even though the panels have provided higher watts that I usually draw. Meaning that Battery is depleted rather than using all available Solar Power.
Anyone have a similar setup and solved the issue with inverter configuration?
For Reference, I generally draw 300W during the day (only computers and lights on the inverter) which sometimes spikes to 600W. Solar consistently provides 100-150W less than total consumption, except if I let the battery drain for a couple of hours in which case the solar production is more (I have seen roughly 7A/90V/630W for 30 minutes to charge the battery, and this out of two 455W panels in Series).
Voltages are set to:
Bulk Charge = 58.4 (recommended charge voltage)
Float Charge = 56 (to allow BMS Balancing to still work)
Low DC Cutoff = 48 (highest it can go, would have like to set this at 51.2 which relates to roughly 20% DoD, higher will ben even better like 52.4)