I want to do the above as a UPS: Charger will keep batteries charged and power load, when power fails batteries will power load until battery voltage falls below set point and BP 65 disconnects load, BP 65 will reconnect when AC power comes back on and batteries will recharge. I believe this arrangement, using the TR-24 Isolated DC/DC Converter, will avoid a reverse current situation through the BP 65. Anybody see any problems with this setup? I didn't show it in this drawing, but there is a 10A breaker between the batteries and the BP 65.