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Old 11-22-2019, 02:49 PM   #1
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Solar battery charging question

After watching quite a few videos and reading several articles I have yet to see this specific question addressed, although I realize there are several thousand people who know the answer. If I mount a permanent solar system, 80-100 watt or so, for the sole purpose of trickle charging my house batteries, how does that system work with the charging systems built into my trailer for use with shore power and also with the charge that comes from my tow vehicle when traveling? In other words, since the solar is normally outputting power in daylight, it will put out power both when traveling and when set up for camping. Do I need to be concerned about overcharging?
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Old 11-22-2019, 02:55 PM   #2
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Do I need to be concerned about overcharging?
No. You will need to install a solar charge controller between batteries and panel. It will act like a smart charger and determine what the battery needs.
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Old 11-22-2019, 03:01 PM   #3
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Originally Posted by wjrdmr View Post
After watching quite a few videos and reading several articles I have yet to see this specific question addressed, although I realize there are several thousand people who know the answer. If I mount a permanent solar system, 80-100 watt or so, for the sole purpose of trickle charging my house batteries, how does that system work with the charging systems built into my trailer for use with shore power and also with the charge that comes from my tow vehicle when traveling? In other words, since the solar is normally outputting power in daylight, it will put out power both when traveling and when set up for camping. Do I need to be concerned about overcharging?
The solar charging system uses a controller that when properly set up will not overcharge a regular battery. If you are plugged into shore power the converter and solar system will provide power to the battery and the battery won't care which source it's feeding from. When the full charge voltage is reached each will switch to the Float mode and life is good.

If you have Lithium batteries that don't like to sit a long time on Float, make sure you have a way shut off the output from the solar panels, preferably a switch.

From what I understand solar controllers don't like to be disconnected from batteries while the panels are producing electricity.
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Old 11-22-2019, 03:02 PM   #4
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Originally Posted by wjrdmr View Post
After watching quite a few videos and reading several articles I have yet to see this specific question addressed, although I realize there are several thousand people who know the answer. If I mount a permanent solar system, 80-100 watt or so, for the sole purpose of trickle charging my house batteries, how does that system work with the charging systems built into my trailer for use with shore power and also with the charge that comes from my tow vehicle when traveling? In other words, since the solar is normally outputting power in daylight, it will put out power both when traveling and when set up for camping. Do I need to be concerned about overcharging?
The solar charging system uses a controller that when properly set up will not overcharge a regular battery. If you are plugged into shore power the converter and solar system will provide power to the battery and the battery won't care which source it's feeding from. When the full charge voltage is reached each will switch to the Float mode and life is good.

If you have Lithium batteries that don't like to sit a long time on Float, make sure you have a way shut off the output from the solar panels, preferably a switch.

From what I understand solar controllers don't like to be disconnected from batteries while the panels are producing electricity.

Give babcock a shout out as he's far more knowledgeable on that than I.
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Old 11-23-2019, 06:50 PM   #5
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Thanks to all for your replies.
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