Bay Seeker

@RussGreen makes a fair point about the threshold balance — in my garden office build I ended up logging actual alternator output voltage over a full drive cycle using a Victron SmartShunt before...

The real culprit is usually phantom load—your fridge, inverter standby, and any always-on devices. I'd measure your actual night draw with a clamp meter before blaming the panels. 200W winter...

Your 300Ah LiFePO4 is the real asset here—that's a proper battery bank. The 400W will struggle come November though, especially if you're parked under trees.