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Old 05-25-2022, 04:30 PM   #1
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Solar: Chassis Battery

I have a 2017 Thor Miramar 37.1.V10 6.8.

I have installed a solar panel, with a Renogy Controller. It keeps my coach batteries charged.

Does it also keep my chassis battery charged? The use store switch is in Storage mode.

Thanks

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Old 05-25-2022, 04:41 PM   #2
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It should, You should have a BIRD or BIM that allows cross charging of the house and chassis batteries from your converter and alternator.. It doesn't know the difference between a converter charging or solar charging. It is connected on the battery side of the USE/STORE latching relay. But a BIRD uses 1+ amps to close the Trombetta relay. I don't know what the BIM constant draw is when connected.
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Old 05-25-2022, 11:07 PM   #3
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Quote:
Originally Posted by Grumpy Grampa View Post
I have a 2017 Thor Miramar 37.1.V10 6.8.

I have installed a solar panel, with a Renogy Controller. It keeps my coach batteries charged.

Does it also keep my chassis battery charged? The use store switch is in Storage mode.

Thanks

I added this clever little device and Im always all charged up.Click image for larger version

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Old 05-25-2022, 11:24 PM   #4
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Quote:
Originally Posted by Grumpy Grampa View Post
I have a 2017 Thor Miramar 37.1.V10 6.8.

I have installed a solar panel, with a Renogy Controller. It keeps my coach batteries charged.

Does it also keep my chassis battery charged? The use store switch is in Storage mode.

Thanks
When I first got mine I took a meter to check the batteries and all are being charged with the switch off
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Old 05-25-2022, 11:32 PM   #5
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I would check the voltage on both sides of the Trombetta Solenoid

Should be exactly the same if you're charging both banks

My original Trombetta failed at about 6 months of age and the replacement is still going 5 years later
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Old 05-26-2022, 04:07 PM   #6
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Solar numbers

High. The attachments are my Solar numbers, for my coach batteries 12 volt system 4-Each six volt batteries. and chassis 1-each 12 volt.

How do they look.?

Thoughts
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Old 05-26-2022, 05:12 PM   #7
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100 watts of solar?
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Old 05-26-2022, 06:07 PM   #8
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Yes. One 100 watt solar panel.
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Old 05-27-2022, 11:20 AM   #9
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How do the numbers look, on the coach batteries and chassis battery?

In the previous post, two pictures.

Thanks
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Old 05-27-2022, 12:40 PM   #10
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Quote:
Originally Posted by Grumpy Grampa View Post
How do the numbers look, on the coach batteries and chassis battery?

In the previous post, two pictures.

Thanks
Looks normal to me.
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Old 05-27-2022, 01:02 PM   #11
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Well, it looks like you are showing 13.9 volts at the coach batteries and 13.5 volts at the chassis batteries. The latter being over 12.7 indicates that it may be getting a charge from the coach system, but the voltages should be equal in that case.

The reason may just be meter inaccuracy, or it may be that you recently turned the chassis engine off and the 13.5 volts is the residual "surface charge" on the battery and the coach DC system is not charging. If so, wait an hour and check again. If the chassis voltage drops below 13 V and the coach stays at 13.9 then your BIRD or whatever is not working properly.

FWIW I have read lots of reports of failed BIRD solenoids and the test for one is noted above. It is fairly cheap and easy to replace it.

David
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Old 05-28-2022, 03:07 PM   #12
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Solar numbers ??

Good morning. Can someone explain these numbers for me in lamans terms the 78% vs the 100%. This is a three day change.

Thanks
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Old 05-28-2022, 03:32 PM   #13
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What kind of display are we looking at?

David
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Old 05-28-2022, 03:52 PM   #14
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Renogy. Wanderer controller.
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Old 05-28-2022, 04:38 PM   #15
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Good morning. Can someone explain these numbers for me in lamans terms the 78% vs the 100%. This is a three day change.

Thanks

Pic on the right looks like you are

making 4.35 amps of solar. probably have 100 watt solar?

your batter bank is full at 100 percent

and you have tiny usage load of .14 amps
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Old 05-28-2022, 04:51 PM   #16
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Thanks. Why do you think it dropped to 78% battery, nothing on, unit in storage, three days ago it was 100%?

Storage switch is in Storage mode?

Thanks
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Old 05-28-2022, 04:52 PM   #17
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And the left image looks like it is a cloudy day and the solar panels are only putting out 0.67 amps.

In both cases I don't know what the bottom numbers mean.

David
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Old 05-28-2022, 04:57 PM   #18
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Thanks. Yes it is a cloudy day.
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Old 05-28-2022, 05:18 PM   #19
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Sounds like a question for Renogy. Not sur how a solar charge controller can even determine the battery bank capacity other than by measured voltage. How is the "load" measured. This is their diagram that I found:



My Renogy battery monitor uses a shunt to measure all current in/out of the battery and I set the full charge battery bank capacity in the monitor. So it always knows the true battery capacity status.
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Old 05-28-2022, 06:17 PM   #20
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Do you have a Renogy bluetooth battery monitor in addition to the solar controller. Maybe that display is presenting data from both sources.

David
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