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05-25-2022, 04:30 PM
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#1
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Senior Member
Brand: Thor Motor Coach
Model: Miramar
State: California
Posts: 894
THOR #22927
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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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05-25-2022, 04:41 PM
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#2
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Site Team
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,329
THOR #7035
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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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Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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05-25-2022, 11:07 PM
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#3
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Senior Member
Brand: Thor Motor Coach
Model: Forest River Forester 235
State: Indiana
Posts: 4,884
THOR #6826
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Quote:
Originally Posted by Grumpy Grampa
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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I added this clever little device and Im always all charged up.
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05-25-2022, 11:24 PM
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#4
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Senior Member
Brand: Thor Motor Coach
Model: Thor Ace 33.1
State: Illinois
Posts: 1,266
THOR #20274
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Quote:
Originally Posted by Grumpy Grampa
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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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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05-25-2022, 11:32 PM
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#5
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Senior Member
Brand: Thor Motor Coach
Model: Tuscany 42GX
State: Missouri
Posts: 1,158
THOR #9178
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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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05-26-2022, 04:07 PM
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#6
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Senior Member
Brand: Thor Motor Coach
Model: Miramar
State: California
Posts: 894
THOR #22927
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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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05-26-2022, 05:12 PM
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#7
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Senior Member
Brand: Thor Motor Coach
Model: Hurricane 35m
State: North Carolina
Posts: 936
THOR #13505
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100 watts of solar?
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Retired Squid who has a Retired Squid that drives him around in a RV!
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05-26-2022, 06:07 PM
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#8
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Senior Member
Brand: Thor Motor Coach
Model: Miramar
State: California
Posts: 894
THOR #22927
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Yes. One 100 watt solar panel.
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05-27-2022, 11:20 AM
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#9
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Senior Member
Brand: Thor Motor Coach
Model: Miramar
State: California
Posts: 894
THOR #22927
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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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05-27-2022, 12:40 PM
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#10
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Site Team
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,329
THOR #7035
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Quote:
Originally Posted by Grumpy Grampa
How do the numbers look, on the coach batteries and chassis battery?
In the previous post, two pictures.
Thanks
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Looks normal to me.
__________________
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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05-27-2022, 01:02 PM
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#11
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Senior Member
Brand: Thor Motor Coach
Model: Axis 24.1
State: Connecticut
Posts: 1,790
THOR #20289
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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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05-28-2022, 03:07 PM
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#12
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Senior Member
Brand: Thor Motor Coach
Model: Miramar
State: California
Posts: 894
THOR #22927
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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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05-28-2022, 03:32 PM
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#13
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Senior Member
Brand: Thor Motor Coach
Model: Axis 24.1
State: Connecticut
Posts: 1,790
THOR #20289
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What kind of display are we looking at?
David
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05-28-2022, 03:52 PM
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#14
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Senior Member
Brand: Thor Motor Coach
Model: Miramar
State: California
Posts: 894
THOR #22927
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Renogy. Wanderer controller.
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05-28-2022, 04:38 PM
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#15
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Senior Member
Brand: Thor Motor Coach
Model: Hurricane 35m
State: North Carolina
Posts: 936
THOR #13505
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Quote:
Originally Posted by Grumpy Grampa
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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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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Retired Squid who has a Retired Squid that drives him around in a RV!
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05-28-2022, 04:51 PM
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#16
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Senior Member
Brand: Thor Motor Coach
Model: Miramar
State: California
Posts: 894
THOR #22927
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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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05-28-2022, 04:52 PM
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#17
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Senior Member
Brand: Thor Motor Coach
Model: Axis 24.1
State: Connecticut
Posts: 1,790
THOR #20289
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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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05-28-2022, 04:57 PM
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#18
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Senior Member
Brand: Thor Motor Coach
Model: Miramar
State: California
Posts: 894
THOR #22927
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Thanks. Yes it is a cloudy day.
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05-28-2022, 05:18 PM
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#19
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Site Team
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,329
THOR #7035
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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.
__________________
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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05-28-2022, 06:17 PM
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#20
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Senior Member
Brand: Thor Motor Coach
Model: Axis 24.1
State: Connecticut
Posts: 1,790
THOR #20289
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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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