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Old 03-07-2017, 10:27 AM   #1
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Does the inverter supply 12v when not charging?

Greetings!! -

We have a 2015 Itasca 37F with the magnum invertor.

Since I cooked a very expensive set of AGM original equipment batteries, I've been very leery of the charging the house battery bank while plugged in - we are plugged in most of the time.

I've taken to charging the house bank to the point the magnum thinks they are fully charged (charging btw at 10%) and then setting the invertor to "Charging-Standby" - which according to the manual should stop the batteries from charging.

What I can't seem to find in any of the documentation is whether or not the invertor is providing 12v to the house 12v system while plugged in. These systems are not real battery intensive (lights, fans etc). Or is my 12v system being driven by the batteries - which of course will be eventually dragged down.

If I toggle the house battery disconnect, the 12v system goes dark - though I don't know what that relay is cutting.

The voltage on the batteries (the only method I have to test) is dropping over time by a few 10ths. I don't know if that is just the batteries sitting/temperature changes of what.

Thanks,
Jerald Pendleton
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Old 03-07-2017, 10:55 AM   #2
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You can find out yourself with a voltmeter. Most inverter/chargers are designed to not only charge the batteries when plugged in, but also provide 12v power for the house functions.

Take voltage readings of your batteries after they have been off charge for an hour. This will allow any surface charge to be absorbed by the battery and give an accurate reading of battery state of charge. take voltage reading at the batteries and also at an interior light or 12v house power outlet. Then plug shore cord in and repeat voltage readings. You should see a voltage increase in all readings when shore power is connected.

Not sure how you would 'cook' the batteries if they were original equipment, the inverter/charger should have been matched with AGM battery type. You may want to reread the Iota manual for your model. Repeated discharge to less than 50% can reduce battery life.
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Old 03-07-2017, 04:06 PM   #3
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Most inverter/chargers are designed to not only charge the batteries when plugged in, but also provide 12v power for the house functions.

Well, there might be some that do that but, ours doesn't. Our coach is an '04 Itasca Horizon 36GD with the C-7 330HP CAT and, it's equipped with the Magnum 2012ME (model, not year) Inverter/Charger. That I/C simply sends a charge to the batteries with or, without the house battery switch being on. It has no capabilities of supplying 12V to the coach, from the Inverter/Charger. The coach relies soley on the house batteries for all 12V duties inside the coach.

Now, if there's other setups out there, including Inverter/Chargers that actually DO supply 12V to run appliances, AS WELL as send a charge to the house batteries, I'm not aware of them.

Scott
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Old 03-07-2017, 04:26 PM   #4
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Quote:
Originally Posted by FIRE UP View Post
Most inverter/chargers are designed to not only charge the batteries when plugged in, but also provide 12v power for the house functions.

Well, there might be some that do that but, ours doesn't. Our coach is an '04 Itasca Horizon 36GD with the C-7 330HP CAT and, it's equipped with the Magnum 2012ME (model, not year) Inverter/Charger. That I/C simply sends a charge to the batteries with or, without the house battery switch being on. It has no capabilities of supplying 12V to the coach, from the Inverter/Charger. The coach relies soley on the house batteries for all 12V duties inside the coach.

Now, if there's other setups out there, including Inverter/Chargers that actually DO supply 12V to run appliances, AS WELL as send a charge to the house batteries, I'm not aware of them.

Scott
If the charger is connected to the batteries, and the batteries connected to the house wiring system, then the charger is providing power to the house system. You can test this by measuring voltage in the house, it will show a charging voltage (>13.5 v) on batteries only it will be <12.7v)

The OP asked about when the I/C was "set to "Charging-Standby" - which according to the manual should stop the batteries from charging." I explained how to tell by taking voltage readings at the batteries and inside the RV. On my RV, the lights get brighter when on shore power, showing a small voltage increase with the charger suppling the voltage.

To run the house system with batteries disconnected, you'd have to wire the 12v out of the I/C to the house wiring system after the battery shut off relay.
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Old 03-07-2017, 05:04 PM   #5
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Any inverter/charger, I ever investigated, charges the batteries thru the same cables that it draws power from, to invert. They go directly to the batteries.

If the house disconnect, which also goes to the batteries, is off, there will be no power from the batteries to the house, with inverter/chargers, charger section, on or off.

You need the battery disconnect ON for house power. You need the charger section ON to maintain the batteries that run the house. If you leave the charger on stand-by, your batteries will run down.

Inverter/chargers are battery chargers.
They are not converters.

Converters can be used as a stand alone power supply, sending regulated power to the house loads, without batteries. That is why they are tied in after the house disconnect switch.

I've searched a bunch of inverter/charger manuals and none of them say they can run without batteries.

I'll bet you didn't kill your AGM batteries. The dealerships are famous for doing that and blaming the owner.

As mentioned, make sure your setting are for AGM batteries. Watch the panel for the charging to drop to float, 13.4 volts, after a day or so of charging. If that happens, you won't burn up your batteries.
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Old 03-07-2017, 05:53 PM   #6
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And never never never equalize your AGM batteries. You will dry them out and destroy them. AGM batteries are whats called Valve Regulated. They operate under positive pressure which recombines the products of charging oxygen and hydrogen back into water. If you equalize them the pressure builds up too high and is forced out the regulator valve. Which then drys out the water in the battery.
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