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Old 05-23-2014, 07:28 AM   #1
gmccausland's Avatar
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Batterys not charging house or coach

Boondocking and I have an issue that I would like to ask this group for some help on.
When on Generator, we have 110 volts and all the outlets work but the batter voltage on the intellect does not show charging from the inverter/battery charger. Test of leads from INverter show 13 volts but panel only shows 8 or 10 volts sometimes lower.

Same occurs above on shore power (Simulated with external generator)

Under engine alternator/generator power, all works as it should. Batteries charge, panel shows 14 volts to batteries etc.

I am suspecting one of the post transfer switch relays, but before attacking thought I would ask this group. Seems we all have the same problems just at different times.

I have a 1999 Newmar Dutchstar with Onan Diesel Generator and a 300 Cummins Engine.

I look forward to your help and thanks to all in advance.

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Old 05-23-2014, 07:45 AM   #2
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Did you measure the charging voltage at your batteries?
Here are some links to help with the understanding of your battery system and 12v wiring and fusing.
Your battery cut off switch is on also so batteries will charge.
Have you checked the wiring connections in transfer switch for loose wiring.

98KSCA, 99MACA, 03 KSCA-3740- 8.1 Chev-- ALLISON Trans, now in good hands
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Old 05-23-2014, 09:19 AM   #3
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Hi gmccausland,
I'm with 007. Consider checking the actual charge volts directly from the battery terminals. If the batteries are actually charging, as they should, you'll need to determine where in the measurement (not charging but measurement) circuit something has broken. If the batteries are not charging, then you are looking in the charging circuit for where the volts are being lost.

I do not think the problem is with the transfer switch. The TS deals with only 120 VAC. If the inverter/charger has 120 VAC incoming and the outbound volts are not correct, the inverter/charger may be suspect.
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battery, charging

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