Progressive Dynamics charger/converter for 2 Trojan T-105’s

In desert? Put some solar on the roof. The issue with charging battery correctly is more about getting it to upper 90% than keeping correct voltages, and generators are not good at getting it to 99.9. Takes a lot of time.

Converter should match Bulk/Absorption voltage of your AGM. And fit into space where the old converter is living now. There isn't much else to it.