We just recently bought a 2017 Fleetwood Discovery 38K. We got this warning on the Firefly system and from last night to this morning the voltage on the house batteries has gone back and forth between 11.6 and 12.1. This is our first long stay at a campground since we bought it, so it is the first time we've been consistently plugged in to shore power. My guesses (based on a lot of reading on here) on what the problem could be range from overworked inverter because of weak batteries to maybe the battery disconnect never got reconnected after some work on the engine before we took possession. I'm not even sure where the battery disconnect switch is or what it looks like. So you will have to dumb this discussion down for me.
I did find what I think is the battery disconnect. There is a red dial type switch in the rear basement compartment where the inverter is. It is switched to "on".
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Inverter/charger not getting 110V... 2 possibilities. 30A Circuit Breaker tripped in you AC panel or hidden on the side of the inverter, a round push to reset button...it has 3 of them in a basement.
There are a few things to check
Is the Pedestal you are plugged in to providing adequate power
Some have plug slots that are loose, or broken wires inside
Do you have a surge protector that shows the condition of the power supply ?
Is your battery bank in good condition
Are connections tight and not corroded. Do batteries need water
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Your batteries were probably installed in your coach in 2016 so that would be the most obvious (weak battery or 2) The switch you referred to is the battery disconnect to the inverter. If all the breakers prove to be made, get a volt meter and check the voltage at each battery, you probably have at least 1 bad.
Your charger seems to be working if it is bringing the voltage up from 11.6 to 12.1 but even 12.1 id pretty much a dead battery.
Chuck
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