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Old 02-22-2020, 11:47 PM   #1
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05 Essex electrical question

On the Magnum inverter information panel where it shows the battery charge mode and voltage, mine usually reads Float charging at 12.3 volts. The amperage varies, right now it's at 15 amps. A couple questions. Is it showing me voltage for my house or chassis batteries? 12.3 doesn't sound like enough to me. Is it? I think the manual says it should be 13.something?? If not, how do I adjust? We're on 50 amp shore power and I have four brand new Deca AGM house batteries. I have the owners manual for the coach but no separate one for the Magnum inverter. I know how to screw in lightbulbs, splice wires, and use electrical tape but that's about the extent of my electrical knowledge.
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Old 02-23-2020, 03:27 AM   #2
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Unplug the battery temperature sensor and see if the voltage moves up to 13.4 volts.

The sensor may have been damaged during battery replacement. The plug is on the inverter case.

If that moves up the voltage, over an hour or so, the sensor needs to be replaced.Click image for larger version

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Old 02-23-2020, 04:24 AM   #3
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The Magnum display would be indicating house battery voltage.

The Magnum web site or a Google will find the documentation. You likely have the RC50 remote panel, maybe ARC50.

Yes, float voltage is typically 13.something - double check the battery type is cinfigured properly for your batteries.

As Twinbiat noted, ensure the battery temperature sensor is in place, if so, disconnect it at the inverter to see if causing a problem.

Magnum tech support is responsive and very good. If needed, they can step you through any configuration needed.
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Old 02-23-2020, 07:41 AM   #4
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Thanks fellas. I'll climb under there and unplug that temp sensor after I get back from church and things dry out a bit. Good rain here yesterday and last night.
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Old 03-02-2020, 11:53 AM   #5
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Very odd thing happened. I've had the coach since July and the float charge voltage has hovered at 12.3 or 12.4 with the old lead core batteries and with the new AGM's I bought in December. This morning I happened to check and it was at 13.4 and is now hovering at 13.5. I've done absolutely nothing. I'm not gonna look a gift horse in the mouth but my curiosity is driving me nuts??
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Old 03-02-2020, 12:14 PM   #6
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Quote:
Originally Posted by DandyDon View Post
Very odd thing happened. I've had the coach since July and the float charge voltage has hovered at 12.3 or 12.4 with the old lead core batteries and with the new AGM's I bought in December. This morning I happened to check and it was at 13.4 and is now hovering at 13.5. I've done absolutely nothing. I'm not gonna look a gift horse in the mouth but my curiosity is driving me nuts??
Is it cold out ?

As temps drop the battery temp sensor raises the charging voltage.
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Old 03-02-2020, 03:27 PM   #7
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Quote:
Originally Posted by twinboat View Post
Is it cold out ?

As temps drop the battery temp sensor raises the charging voltage.


I'm in Arizona, so no. It's a moot point anyhow because it's back down to 12.4 where it's always been?? Kinda figured it was too good to be true!
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