[cknuth]

I’ve continue to measure loads on both 12V and 120V sides of the coach system. Starting to feel comfortable with the following direction.
- Replace existing golf cart batteries with 6 – 100Ah Battleborn lithiums.
- Adjust MagnaSine inverter charging parameters per BB specs.
- Replace the existing Echo Charger and battery isolator with a Sterling B2B 60A charger, also adjusted to BB charging parameters.

It was pointed out that running the air-cooled 270A alternator anywhere near its rating would lead to burn-out. Here are the 12V load numbers:
- Chassis driving requirements with all lights and and air conditioning on = 60A measured
- Chassis battery charging requirement nominally 10A measured
- House battery charging requirement= 60A (limited by Sterling B2B)
This total load of 130A whilst driving is less than 50% of the Leece Neville 270A rating, which seems safe.

The house battery charging rateof 60A works out well: eight hours of driving @ 60A is 480 Ah of charge. That’s exactly the capacity of the house lithium battery at 80% discharge. Subtracted from this, of course, are the 12V and 120V house loads that are on whilst driving – about 40Ah for that 8-hour period. And on shore power, the inverter will charge at 125A.

I’m inviting comment, questions and further input from any interested gurus. I’m about to pull the trigger and value your input as always.

Thanks!
Chuck