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Old 08-01-2015, 09:55 AM   #1
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House batteries

MH is normally plugged into residence when not heading to a campsite. Runs fridge and fans. Had inspection done, sat in lot one week. Picked up and engine started right up. Checked monitor, and house batteries low. Showed no power input to house batteries with engine running, inverter on. When plugged into home, monitor went to bulk charge, and brought to float after a while. I have had the big boy checked twice and told all O.K. I believe that the house batteries should be charging while the engine is running. Dash shows that charging is 13.5+/- when driving (for engine batteries). Any ideas?
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Old 08-01-2015, 12:28 PM   #2
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What happens with the inverter off? Could be you are drawing more power with the inverter on than the engine alternator can supply and do it's other chores.
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Old 08-01-2015, 02:58 PM   #3
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Do you have a battery tender, mine is located in the back passenger side electrical run bay.

The LE-415 RV-Battery-Maintainer - The Product

It may not be functioning right as it will use the alternator to charge the coach batteries.

If the coach batteries are discharged the alternator will have to work harder to bring them up. It would probably be better to run the generator in a situation like this.
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Old 08-01-2015, 03:19 PM   #4
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Dig into the big boy specs. 13.5 may not be quite enough to make it combine. They work by sensing charging volts from 1 source or the other.

Your alternator should get up near 14 volts after topping off the engine batteries.
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Old 08-01-2015, 06:15 PM   #5
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Quote:
Originally Posted by Long Island Mac View Post
MH is normally plugged into residence when not heading to a campsite. Runs fridge and fans. Had inspection done, sat in lot one week. Picked up and engine started right up. Checked monitor, and house batteries low. Showed no power input to house batteries with engine running, inverter on. When plugged into home, monitor went to bulk charge, and brought to float after a while. I have had the big boy checked twice and told all O.K. I believe that the house batteries should be charging while the engine is running. Dash shows that charging is 13.5+/- when driving (for engine batteries). Any ideas?

Give Monaco tech support a call. There are different specs on the control board for the Big Boy. Not all combine the battery banks under all conditions.


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