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Old 10-21-2021, 05:13 AM   #1
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Electric advice

I posted about problem earlier. Came back to motorhome in Florida, forgot to cutoff batteries and now dead. Plugged into shore power. 110 side of motorhome works 12 volt side (lights, toilet) does not. I would guess that my converter needs to charge my batteries up so the 12 volt works. Is this correct and any tips other then when I leave, cut off batteries
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Old 10-21-2021, 05:23 AM   #2
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You most likely have an Inverter/Charger, not a converter/ charger in that rig.

With totally dead batteries, that present a problem. Inverter/chargers will not charge batteries that low. They need to sense that batteries are connected, and completly dead ones don't do that.

You will need to jump a good battery into the system to bring up the voltage, jump start the main engine so it charges them, or connect a standard battery charger to the batteries for a while.
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Old 10-21-2021, 05:58 AM   #3
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Dead, dead batteries will be very reluctant to accept a charge at first. Just connecting up a jump pack or dumb charger may require some number of minutes or even hours to begin charging up enough that they'll have residual voltage and allow a smart charger to take off. Provided the batteries aren't irreversibly damaged, allow the batteries to come up completely - 24 hours would not be an unreasonable cycle time even with a moderately sized charger. With any luck they'll recover but it should be anticipated there could be some reduction in capacity if these batteries have sat dead for some number of weeks, or longer.

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Old 10-21-2021, 07:40 AM   #4
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One quick additional thought on charging options. I believe that your engine alternator is rated at 160 amps. That is not a continuous rating but a peak rating. It would be best to do the bulk of your charging with other than the engine alternator. My first choice (once you get the batteries to where they will begin to take a charge) would be shore power. My second choice would be a good plug-in battery charger. My third choice would be your on-board generator (only because it would be a shame to run that generator just for the battery charging operation). My last choice would be the main engine alternator.

I've inadvertently wound up with pretty "dead" batteries myself, numerous times over the years, and hopefully you'll recover with minimal loss of life to them. If they don't recover, they were probably in the fourth quarter of their game already, anyway. Good luck to you.
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Old 10-21-2021, 11:56 AM   #5
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Thanks everyone. I did a inverter reset, said some bad words and we have power
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