BAC Forum
General Boards => Technical Support => Topic started by: Rick Mayer on May 13, 2025, 07:16:58 PM
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1993 Beaver Grand Marquis Just returned from annual service check where the coach sat for 8 days without shore power. Drove it 20 minutes to get it home, when I plugged it into shore power, 000 AC Voltage from the inverter. All other AD & DC Voltages normal. The Heart battery status Panel display showed Red shutdown, Red High Temp, Green AC input, Blank AC Output Power On. All AC & DC Breakers OK. Reset system with switch on inverter, No Help. Removed positive cable from House batteries and opened 30 Amp Leg A CONV Breaker and reset both. No Help.
Neither Shore power nor the Generator will charge house batteries. Boost start does work. The real pain, is only a single outlet inside and one in the basement are powered, with the up coming Int'l Rally in Amana it would be an advantage to at least getting the outlets powered as a temp fix. Bill Dowden & Chuck Jackson have been of great help, but still seeking advice from all. Thanks Rick Mayer 6053210966
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Inverter/charger may not be kicking in due to low voltage in batteries. Have you checked the battery voltage? If low, try a remote charger on the batteries to bring them up and then try the inverter/charger again. Hope this helps. Good luck.
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If your house batteries are low, DO NOT charge them using a running coach engine and its alternator. Use either a portable charger or start the generator (using a jumper from a battery if it won't start due to low batteries) to charge up the two coach banks of batteries.
Especially if the house batteries are low, DO NOT use the coach engine and its alternator to charge them up. The demand on the engine's alternator will cause the alternator to overheat and blow a diode(?) leaving the alternator dead. Replacing the alternator will cost several hundred dollars. Been there, done that! I have heard recommendations for allowing the generator to run to charge for 30 to 60 minutes before starting the coach's engine.
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Rick
If you decide to temporarily by pass the inverter you must disconnect both the 110 volt input and outputs and connect them together.
DO NOT connect power to the output of the inverter as that will damage the inverter itself.
These inverters monitor the temperatures of the mosfets inside them when they are working in order to keep them from over heating
It sounds like that function has failed and the system has defaulted into an over heat shutdown.
Unfortunately the older Heart inverters are no longer supported , there are few places that will even bother to service them because they can't get parts fix them..
Inverter chargers tend to be a nice warm place and mice love to make nests in or around them leading to these types of failures.
With that said if you take the inverter out and remove the cover you should find a pair of glasses fuses inside ( might be worth checking)
Be careful these inverters are often in hard to reach places and are very heavy.
Eric