PatD
New Member
I have an off grid system That is not performing well at all.
Battery seems to charge but takes a significant time to replenish.
I have limited the load on the inverter to a single refrigerator with no other loads.
MPP unit seems to draw a significant amount of power in no/small load situations (ie. just to power MPP unit cooling fans.)
I configured the solar panels in 2 parallel strings of 2 to accommodate the MPP max VOC and to try and address possibility of shading.
I do have a small 30AMP 2400W generator to provide supplemental battery charging through the MPP All-in-1.
I do want to run either a DC fridge or a small AC fridge as the central reason for solar. Lights and Starlink are only other power draws.
Thoughts I have had.
Replace MPP All-in-1 with an efficient MPPT controller (Victron or similar) and separate inverter-charger.
Add more battery storage (maybe rackmount?). Not sure my home built cell system is performing.
Add additional solar panels (ie. purchase 2 more of same panels and make 2 P strings of 3S panels to keep Voc under 150V. I do have to contend with trees as the location is lakeside but with tall trees at shoreline which limits my direct sunlight to 11AM- sunset.
I am sure throwing money at this would help but want to take technically sound steps forward. Not sure where to start to understand why or where to start when focusing on a remedy. Any help would be gratefully received.
Config.
West Kootenay, British Columbia
Current Solar Power System MPP Solar LV3KVA-24V (110Vac 2400w 24V Solar Power inverter 80a MPPT solar charger 60a battery charger, Max PVoc 145V)
16 LiFePO4 (Bosan-NEW) cells is 8S2P config. (8 serial groups of 2 cells in parrallel) 8S BMS - Overkill with Bluetooth
4 - 435W Solar panels in 2S2P config (Quantum Q.PEAK DUO L-G8 425) Voc At Normal Operating Condition 46.29V
Battery seems to charge but takes a significant time to replenish.
I have limited the load on the inverter to a single refrigerator with no other loads.
MPP unit seems to draw a significant amount of power in no/small load situations (ie. just to power MPP unit cooling fans.)
I configured the solar panels in 2 parallel strings of 2 to accommodate the MPP max VOC and to try and address possibility of shading.
I do have a small 30AMP 2400W generator to provide supplemental battery charging through the MPP All-in-1.
I do want to run either a DC fridge or a small AC fridge as the central reason for solar. Lights and Starlink are only other power draws.
Thoughts I have had.
Replace MPP All-in-1 with an efficient MPPT controller (Victron or similar) and separate inverter-charger.
Add more battery storage (maybe rackmount?). Not sure my home built cell system is performing.
Add additional solar panels (ie. purchase 2 more of same panels and make 2 P strings of 3S panels to keep Voc under 150V. I do have to contend with trees as the location is lakeside but with tall trees at shoreline which limits my direct sunlight to 11AM- sunset.
I am sure throwing money at this would help but want to take technically sound steps forward. Not sure where to start to understand why or where to start when focusing on a remedy. Any help would be gratefully received.
Config.
West Kootenay, British Columbia
Current Solar Power System MPP Solar LV3KVA-24V (110Vac 2400w 24V Solar Power inverter 80a MPPT solar charger 60a battery charger, Max PVoc 145V)
16 LiFePO4 (Bosan-NEW) cells is 8S2P config. (8 serial groups of 2 cells in parrallel) 8S BMS - Overkill with Bluetooth
4 - 435W Solar panels in 2S2P config (Quantum Q.PEAK DUO L-G8 425) Voc At Normal Operating Condition 46.29V