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Old 12-24-2017, 09:41 AM   #1
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Understanding Charging Systems

Here's a great series of blog posts about how RV battery charging systems work.
https://roadslesstraveled.us/rv-mari...harging-basics
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Old 12-24-2017, 09:47 AM   #2
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Thanks! I am all about learning new stuff!!!


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Old 12-24-2017, 04:31 PM   #3
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Am wanting to check specific gravity on my dual 6V. As per instructions I removed any charge source by disconnecting negative then positive cables and am going to let them rest for an hour.

Weird thing is my interior lights and range hood fan still work! Huh? I do have factory solar.

No shore power or umbilical connected btw.
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Old 12-24-2017, 04:40 PM   #4
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The lights are flickering; perhaps there is some residual power stored somewhere.
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Old 12-24-2017, 04:51 PM   #5
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The lights are flickering; perhaps there is some residual power stored somewhere.
If your battery disconnect is in the normal (ON) position, your solar system would be connected to the trailer 12V system, so your solar is running the lights directly. Check your solar manual, it might suggest to cover the solar panels if disconnecting the battery.

But leaving a 12V load from the trailer ON might keep the solar controller within its operating voltage range.
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Old 12-24-2017, 05:48 PM   #6
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Originally Posted by Rossue View Post
Am wanting to check specific gravity on my dual 6V. As per instructions I removed any charge source by disconnecting negative then positive cables and am going to let them rest for an hour.

Weird thing is my interior lights and range hood fan still work! Huh? I do have factory solar.

No shore power or umbilical connected btw.
This is a bad idea if you have the GoPower solar controller. The manual states that the panels must be disconnected (or covered) before the controller is disconnected from the batteries.

Unless you have added a panel disconnect switch, if you have solar, the best way to check the battery state of charge by voltage is to wait until dark, unplug from any other charging source (the tow vehicle and campground power pedestal), then add a small load (an amp or two) for half an hour or so, remove the load, and measure the voltage.
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Old 12-24-2017, 05:59 PM   #7
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So I guess we have the common single stage Atwood 55?
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Old 12-24-2017, 06:29 PM   #8
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If you are asking about the converter, it's a WFCO 8955 if things have not changed. It's a multistage, but rarely goes into bulk.
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Old 12-24-2017, 06:57 PM   #9
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If you are asking about the converter, it's a WFCO 8955 if things have not changed. It's a multistage, but rarely goes into bulk.
Great...thanks
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Old 12-24-2017, 07:40 PM   #10
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This is a bad idea if you have the GoPower solar controller. The manual states that the panels must be disconnected (or covered) before the controller is disconnected from the batteries.

Unless you have added a panel disconnect switch, if you have solar, the best way to check the battery state of charge by voltage is to wait until dark, unplug from any other charging source (the tow vehicle and campground power pedestal), then add a small load (an amp or two) for half an hour or so, remove the load, and measure the voltage.
So I read the instructions before starting as I seem to remember you or someone else stating the above warning, however I didn't see it. I do sometimes have the Mr. Magoo syndrom(which drives Susan nuts!), however does anyone else see it in the instructions? I did this two years ago when replacing my Group 29 12V with dual 6V and had no problem then either. Anyway, have put it all back together and seems ok.

http://gpelectric.com/files/gpelectr...-PWM-30_vD.pdf
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