I’m a having persistent battery issue. I fully charge and balance 4, 100ah batteries and hook it up to my system. After a few weeks the system will crash (drop from ~24v to 12v). When I check the voltage at each battery, one in each series is at 12v while the other has almost no charge. I also note that even with full sun the system never reaches the 27.5v needed for the battery balancer to activate.

Any help or referrals for a consultant who could help would be appreciated.

This is the system components.

Solar system

ECO-WORTHY 1200W 12V/24V Solar Panel System: 6pcs 195W 12V Mono Solar Panels 60A Charge Controller for 12V/24V Battery Charging Breaker Solar Combiner Box, 4680Wh/Day Output Off Grid Solar Power Basic System

4 x LifePo4 Battery 12V 100Ah Deep Cycles with 100A BMS Grade A Cells for Solar Trolling Motor RV Camping Off-Grid System Household Appliances with Low Temp Protection

Senmubery Dual Power Controller Automatic Transfer Switch Solar

POOXTRA 2000W Power Inverter Pure Sine Wave 24V to 110V/120V Inverter with 4 AC Outlets and 2.1A USB Port & Remote Control for RV Trucks Boats and Emergency

Victron Battery Balancer

Victron SmartShunt 500A - Smart Battery Monitor (Bluetooth)

Plus: breakers, buses and wire.