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Old 03-14-2020, 09:11 AM   #1
Deepsea's Avatar
Join Date: May 2017
Location: Callaway
Posts: 52
House Battery Charge

Just replaced my 6 house batteries with new Trojan T-105 6V 221 AH AMG. I have a Magnum Charger/Inverter MS 2012. I live in my coach full time and am hooked up to 50 amp shore power. I've had the batteries for about 2 weeks. When I got back to my site I called Magnum to make sure I had it set up to properly maintain a charge. The guy walked me through the menu on the controller and I was good to go. Now while I'm plugged in to shore was in a Float status and the batteries were showing about 13.4 to 13.6. A maintenance guy had to replace an A/C plug in my pedestal this morning and disconnected me from shore power. When I checked the battery voltage after the Inverter?converter switched over it was showing 12.6 volts on the batteries which seemed kind of low for fully charged new batteries. Now I'm back on shore power and the Inverter/Charger is in the Absorb mode and is showing 14.9 volts. Is this normal?

2013 Newmar Canyon Star 3610
2013 Ford F 150 Eco Boost Ext cab 8' bed
2018 Kawasaki KLR 650
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Old 03-14-2020, 09:51 AM   #2
Join Date: Oct 2018
Location: Arlington , Wa.
Posts: 81
A battery at rest , about a hour after charging , will show 12.6v as full charge . During float charging 13.2v - 13.4v is what the batteries will show when fully charged .
You're good , everything's working properly .

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Old 03-14-2020, 10:06 AM   #3
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Join Date: Nov 2018
Location: Beaver Dam, Wisconsin
Posts: 1,021
Battery University

I agree with Bill above. Everything is good to go.
A battery being discharged shows lower terminal voltage than with no load. The more current being drawn, the lower the voltage will be. When the high current stops, the voltage will slowly rise.

The static voltage tables only apply when there is no current being drawn and the battery has not been charging for a few hours.
So you have one voltage behavior when discharging. You have another when charging, and a third when in static state.

These links can help you understand if you have time and inclination to study.

Battery University https://batteryuniversity.com/

How does the Lead Acid Battery Work? https://batteryuniversity.com/learn/...ased_batteries

Charging lead acid batteries https://batteryuniversity.com/learn/...d_acid_battery

How to Charge and When to Charge? https://batteryuniversity.com/learn/...o_charge_table
How to Store Batteries https://batteryuniversity.com/learn/...tore_batteries

Summary of Doís and Doníts https://batteryuniversity.com/learn/..._battery_table

Confusion with Voltages

How to Measure State-of-charge

I wish you good luck and happy trails ahead!
Paul Bristol
Kodiak Cub 176RD
Nissan Pathfinder 2015
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Old 03-15-2020, 07:32 AM   #4
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Join Date: May 2017
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Thanks for your reply and the links to enhance my knowledge in the subject.
2013 Newmar Canyon Star 3610
2013 Ford F 150 Eco Boost Ext cab 8' bed
2018 Kawasaki KLR 650
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