Coast Resorts Open Roads Forum: Fifth-Wheels: Easy battery question
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 > Easy battery question

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jefffoxsr

Michigan

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Posted: 11/03/13 03:10pm Link  |  Quote  |  Print  |  Notify Moderator

I am trying to figure out how much current is required to maintain the charge of my single group 27? RV battery over the winter.

I want to buy a solar panel of the proper amperage.

There is a 5 watt panel that I have that is 350 milliamps at 24 volts in bright sunlight. I measured it at about 16 volts when the sun is behind the clouds. I don't know how to figure out how many milliamps that would be at 16 volts.

Assume 7 hours of daylight with most of those days being cloudy in the winter here.

How many milliamps per cloudy day would be put into the battery with this 5 watt panel and would that be enough to maintain the single standard group 27?

If the 5 watt panel won't be enough then can you tell me what wattage would be the minimum wattage panel adequate to maintain the battery?

Thanks.


Jeff
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Swamp Man

Addis, Louisiana

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Posted: 11/03/13 03:16pm Link  |  Quote  |  Print  |  Notify Moderator

Jeff,

The solar panel isn't that important as long as it will put out at least 100 watts. What is important, is the controller charging the batteries. If you over charge the battery, you are faced with a dead battery. Same thing if you under charge it. Check the sites on solar charging to find a charger for your RV that has a maintenance charge cycle.


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RCMAN46

NorthWest

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Posted: 11/03/13 03:26pm Link  |  Quote  |  Print  |  Notify Moderator

As per optima if voltage is between 13.2 and 13.8 and less than 1 amp you can go for an indefinite time.


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pianotuna

Regina, SK, Canada

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Posted: 11/03/13 04:08pm Link  |  Quote  |  Print  |  Notify Moderator

Hi,

A flat install of a 15 watt panel would be safe. Anything more and a charge controller may be necessary.

* This post was edited 11/03/13 04:37pm by pianotuna *


Regards, Don
Full Time in a 28 foot Class C, 256 watts solar, 556 amp hours of AGM in two battery banks 12 volt batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

hmknightnc

Wilmington, NC

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Posted: 11/03/13 04:27pm Link  |  Quote  |  Print  |  Notify Moderator

If your opening your battery disconnect (or disconnecting the battery) a 5 watt panel with no controller on a GP27 will be fine. It will just make up for battery internal losses which all you need for that kind of service.

If your thinking about what it takes to have useful actual recharge capability then you need to be thinking 85Watts with controller and up depending on power needs.

B.O. Plenty

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Posted: 11/03/13 05:52pm Link  |  Quote  |  Print  |  Notify Moderator

Why not just take it out and eliminate the possibility of an electrical malfunction? You can charge it home once in awhile or put a battery maintainer type charger on it. Lots cheaper and you know it will work.

B.O.


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time2roll

Southern California

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Posted: 11/03/13 06:14pm Link  |  Quote  |  Print  |  Notify Moderator

5w in winter? Maybe in the south.


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