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Old 04-07-2018, 02:07 AM   #1
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Default AGM Battery Charging and keeping the battery charged from AC continuously

Hi everyone,

I'd really like advice on if I can keep my new Class B constantly plugged into shore power. I like the idea of being ready to go at a moment, but the tech guy at our dealer said that wasn't a good idea for the batteries.

When he told me this, I was rather disappointed - I'd had sailboat for 30 years and always plugged into shore power at the marina to keep the batteries in top shape.

Thanks for your comments, please go easy on me...this is my first RV, I've had a sailboat for 30 years.

Rebecca
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Old 04-07-2018, 02:16 AM   #2
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It depends on what the RV is using to charge/maintain the batteries. Get that information and post it here so folks can help. My RV uses a converter made by Progressive Dynamics. I leave my van plugged in whenever I'm not driving it.
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Old 04-07-2018, 03:17 AM   #3
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We keep ours plugged in when parked in the driveway. As Eric said, it depends on the charger/converter. The one in the toyhauler we had before the Winnie would start out at 14.7 volts, and after several hours drop to 13.3. Better than staying at 14.7 all the time, but too high to leave an AGM battery connected all the time. But the converter in our Winnie drops to 13 volts and stays there once the battery is fully charged. 13V is perfect for maintaining an AGM battery.
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Old 04-07-2018, 03:54 AM   #4
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If you park outdoors, even a modest solar panel with a good controller will keep your battery healthy and ready to go. Our old rig did not have solar, so I kept it plugged in whenever possible. Now that we have a panel, I don't bother.

This assumes you have flooded or AGM batteries. If you have lithium and park in cold weather, you will need shore power when it is cold to protect the battery. This is one of the major disadvantages of lithium.
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Old 04-07-2018, 05:43 AM   #5
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.

The new 3-stage chargers will go into trickle-charge maintenance mode once the battery is fully charged. You can leave the RV plugged in all the time.
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Old 04-07-2018, 03:52 PM   #6
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If you park outdoors, even a modest solar panel with a good controller will keep your battery healthy and ready to go. Our old rig did not have solar, so I kept it plugged in whenever possible. Now that we have a panel, I don't bother.
We have solar, but living in the PNW where the days get really short in the winter, and the sun is obscured by clouds for months at a time, solar isn't going to keep the battery topped off.
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Old 04-07-2018, 04:25 PM   #7
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We have solar, but living in the PNW where the days get really short in the winter, and the sun is obscured by clouds for months at a time, solar isn't going to keep the battery topped off.
I'm not sure I believe that. Maintaining a float on a fully-charged battery does not take a lot of power, and your solar is never going to go to zero (except during snow-cover).

I recommend giving it a try next winter. You might be surprised.
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Old 04-07-2018, 04:32 PM   #8
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Quote:
Originally Posted by eric1514 View Post
It depends on what the RV is using to charge/maintain the batteries. Get that information and post it here so folks can help. My RV uses a converter made by Progressive Dynamics. I leave my van plugged in whenever I'm not driving it.
The Galleria 24 has a 2000 Watt Xantrex Freedom XC Series Inverter Charger, the battery is a 330 AMP AGM Battery REV-8D-330, R4000 series (Relionbattery.com).

There's also a 100 Watt Solar panel.

Thanks everyone for your input! For those who leave the RV plugged in to shore power, do you leave the refrigerator/freezer on all the time?
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Old 04-07-2018, 04:54 PM   #9
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Quote:
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I'm not sure I believe that. Maintaining a float on a fully-charged battery does not take a lot of power, and your solar is never going to go to zero (except during snow-cover).

I recommend giving it a try next winter. You might be surprised.
I wasn't sure if the solar could keep up with all of the little things in the van that can't be turned off unless you hit the battery disconnect switch: the stereo display, the little blue LED lights in every USB outlet, the control panel, the propane gas detector, etc.

It is really dark here in the dead of winter. The sun is very low on the horizon, and my house is on the north side of a hill, plus my back yard is shaded by tall cedars and hemlocks. Add in the constant cloud cover, and there really isn't much light.
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Old 04-07-2018, 04:55 PM   #10
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The Galleria 24 has a 2000 Watt Xantrex Freedom XC Series Inverter Charger, the battery is a 330 AMP AGM Battery REV-8D-330, R4000 series (Relionbattery.com).

There's also a 100 Watt Solar panel.

Thanks everyone for your input! For those who leave the RV plugged in to shore power, do you leave the refrigerator/freezer on all the time?
Fridge off, doors closed, with a box of baking soda in fridge and freezer.
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