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Combox is what you need to talk to a Conext, which doesn't have a usable interface otherwise. Thanks, I'll add SG.

I can program charge voltages if I get a Combox.

The Conext MPPT80 manual shows the default nominal battery voltage is 48V. Since we have a 24V battery setup, The installer must have had some way to adjust settings in the Conext. So I think it's not likely that the Trojans are being charged incorrectly, but have no way to find out.

Thanks for the replies people. Some answers: Use during an outage is light, we only have 12 kWH. Lights, computers 3, no microwave, gas stove, fridge, freezer... It works as we can charge off the PV panels. We have an 8kW generator for backup (like most people in Maine), so we can afford to...

Our solar PV was installed about 2012, and we are still using the original batteries. We are on-grid, Fronius inverter, Magnum AC battery charger. Sometime in the past 10 years we added a Conext battery charger to allow charging directly off the solar panels. About 6kW of solar panels, with 8...