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Old 09-21-2017, 04:06 PM   #1
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Connecting multiple batteries / Camper battery question?!

Two questions for all the experienced people out there.

We use our camper about twice a month. We never bring it to town.

- I was thinking of adding a second marine battery because our heater won't work with just one. Cheaper than buying a generator. But how do I connect them together?

- Should I be disconnecting the battery from the camper every time we go home for the week or just leave it connected - is that safe?
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Old 09-21-2017, 04:17 PM   #2
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If they are 12 volt batteries, which a single marine battery probably is, connect the positive to positive and then negetive to negetive.

Use wire the same size as is there, not thinner. The size may be printed on the wire. ( 12, 10, 8, 6, or 4 gauge.

It is best to disconnect the batteries, in storage, unless you have some solar charging them.

You still need a way to recharge your batteries after using them. Leaving them discharged week after week will kill them in a season.
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Old 09-21-2017, 04:17 PM   #3
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To connect the 2 batteries together for a 12 volt system connect the pos to the pos. And neg to the neg.
connect your RV to either battery.
As for disconnecting when your not there. I wouldn't unless you were having a discharging problem. I'm sure others will have a different opinion on this.
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Old 09-21-2017, 04:45 PM   #4
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I have a solar pannel - is is safe to leave that connected to battery when gone for weeks on end?

Disconnect battery from camper but leave solar pannel connected?
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Old 09-21-2017, 05:12 PM   #5
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Originally Posted by Thcguy12 View Post
I have a solar pannel - is is safe to leave that connected to battery when gone for weeks on end?

Disconnect battery from camper but leave solar pannel connected?
Let us know what you have, as far as solar and controller.

If it's a 3 stage controller, you can leave it connected. It will be better if you did leave it connected.

When you arrive, you will have full charged batteries and not let them sit at a low charge condition for weeks, after you leave.

I have solar on my boat and motorhome. They are never turned off.
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Old 09-22-2017, 09:56 AM   #6
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Here is what the solar pannel says on back:

IRADIADIANCE AND CELL: 1000W AMI 1.5 25C
80W
18V
3.33A
21.6V
3.66A

Not sure if that helps.
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Old 09-22-2017, 10:02 AM   #7
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If your heater won't work with one battery, why do you think it will work with 2? The voltage will be the same.
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Old 09-22-2017, 10:25 AM   #8
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ampacity
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Old 09-22-2017, 10:33 AM   #9
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. . . connect your RV to either battery.
Actually, it's best to connect the motorhome positive to one battery and the motorhome negative to the other battery to insure even discharge of the batteries. The charger (or solar or both) should be connected the same way to insure even charging of the batteries.
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Old 09-22-2017, 10:35 AM   #10
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It a a 80 watt solar panel and outputs 18 volts.

If you don't have a charge controller, then pick one up and wire it in.

The controller will not allow the volts to go higher then needed, causing the panel to overcharge your battery.

With the controller, you can leave your panel connected to your batteries all of the time.

Here is an inexpensive one.

https://www.amazon.com/dp/B01D2Y5LT0...a-304763560006
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Old 09-22-2017, 11:42 AM   #11
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Quote:
Originally Posted by Thcguy12 View Post
Here is what the solar pannel says on back:

IRADIADIANCE AND CELL: 1000W AMI 1.5 25C
80W
18V
3.33A
21.6V
3.66A

Not sure if that helps.


Ok , so you have a 80 watt 12 volt nominal (18) 3 amp panel. Do you have a controller between it and the battery ? Anything more than about 20-40 watts needs or at least should have a controller to vary the volts and amps to the battery depending on its charging needs. I wouldn’t direct connect it without a controller and leave it
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Old 09-22-2017, 11:47 AM   #12
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Actually, it's best to connect the motorhome positive to one battery and the motorhome negative to the other battery to insure even discharge of the batteries. The charger (or solar or both) should be connected the same way to insure even charging of the batteries.
It makes absolutely no difference; electrically it is the same.
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Old 09-22-2017, 01:16 PM   #13
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It makes absolutely no difference; electrically it is the same.
That seems to run counter to every solar forum and board and diagram I've read on battery set up.agreed Not much difference on a couple batteries but becomes more critical as you add battery's to the bank.
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Old 09-22-2017, 01:25 PM   #14
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That seems to run counter to every solar forum and board and diagram I've read on battery set up.agreed Not much difference on a couple batteries but becomes more critical as you add battery's to the bank.
The only way it would make any difference is if you had enough resistance in the interconnecting cables to cause a voltage difference between all the positive terminals or all the negative terminals.
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