A few more questions about solar panels...
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Jul-31-2022 11:41 AM
https://www.rv.net/forum/index.cfm/fuseaction/thread/tid/30348700.cfm
I've since bought a new controller (because the old one would show the batteries as Charged even though they obviously weren't) and I've come across another puzzle....
The controller is a RENOGY Voyager, rated at 20 amps which should be sufficient for my 100W panels.
Here are the details of my solar panels: The first is an offshore-made flexible type...
and the second is a rigid style, like the type you get mounted to a roof...
As you can see, the specs are fairly close and do NOT exceed the ratings on the controller.
Here's the interesting part; when I connect only ONE panel I get a charging current of around 2-3A.
If I connect the second one in parallel, the charging current either stays the same or decreases slightly.
The controller has built in reverse polarity protection and it gives no errors, so I'm 99.9% certain that the panels are connected properly.
So why am I getting LESS current with the second panel connected?
Does the controller sense that less is required because the batteries are fully charged (still connected to shore power)?
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Dec-01-2024 12:02 PM - edited Dec-01-2024 12:02 PM
I’ve been there with faulty controllers before, so I totally get the frustration. I recently upgraded my system and ended up using a controller from solarsmart.ie, and they were really helpful. I had an issue where my panels weren't charging correctly, and their support team walked me through the process of figuring it out—turns out, I was using the wrong type of cable for my panels! After swapping it out, everything worked like a charm. They’re pretty knowledgeable about different setups and have great customer service if you need any advice.
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Nov-20-2024 09:12 AM
I remember your previous post about the issues with your solar setup! It's great that you got the new RENOGY Voyager controller. With the 100W panels, that controller should be fine. I’ve used a similar setup before, and the Voyager did a solid job handling everything. The flexible panel you mentioned can be a bit tricky with its power output, especially if it's offshore-made—sometimes they don’t perform quite like expected.
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Nov-20-2024 09:22 AM
While i am sure Qazert would appreciate the follow up, you are responding to a post that's 2 years old and they haven't been on here since. Also, reading through the thread it looks like the OP already solved/answered any questions they had.
Jeff - 2023 FR Sunseeker 2400B MBS
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Nov-20-2024 09:10 AM
Have you checked the voltage of the panels at different times of the day?
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Aug-17-2022 05:18 PM
Spent the past two weeks "dry camping" and we brought along our "spare" 100W rigid solar panel.
With the new charge-controller in action, we had ZERO issues with the batteries this time.
By the end of the second week, I put away the rigid panel and just used the flexi-panel on the roof. Controller was drawing between 5 and 7 amps first thing in the morning and was down to 1 or 2 by noon...into fractions by dinner time.
I call it a success.
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Aug-01-2022 01:21 PM
CA Traveler wrote:Qwazert wrote:Absolutely and then you'll need another 100W and then another... :B
Everything appears to be working as it should...but I need AT LEAST another 100W of solar-grabbing capacity.
Well, as I mentioned a few weeks back...my buddy has two 95W panels on his roof, the same batteries and never has an issue.
We have similar camping "styles" and similar RV's. If I get another 100W flexi-panel...I'll be 10W up on him. 😄
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Aug-01-2022 12:34 PM
Run the fridge on propane to better simulate boondocking if you wish.
Timbrens
2013 KZ Durango 2857
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Aug-01-2022 12:12 PM
Qwazert wrote:Absolutely and then you'll need another 100W and then another... :B
Everything appears to be working as it should...but I need AT LEAST another 100W of solar-grabbing capacity.
750 Watts Solar Morningstar MPPT 60 Controller
2014 Grand Cherokee Overland
Bob
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Aug-01-2022 10:55 AM
After my work was done, I connected the flexi-panel first and tossed it up onto the roof like I usually do. The Controller showed 3 – 4 amps of charging current. Disconnected that one and then connected the rigid mono-crystalline panel...showed about 5 amps.
Battery voltage was about 14.5 in both cases.
Next, I connected both panels in parallel...controller current showed between 7 - 8 amps at first. Within 15 minutes, this dropped to around 4....then to about 2 (about 15 mins later).
Battery voltage was steady14.3 – 14.5
Solar-panel voltage fluctuated from about 19 volts at the beginning, to around 16 near the end (when controller-current dropped to 2 amps).
I went inside and turned on every light and fan there was...controller current jumped back up to about 5 amps and solar-panel voltage increased as well.
Left everything on for about 10 minutes then turned it all back off...within three to five minutes, the controller-current dropped to 2 amps and solar-panel voltage to about 16.
So it looks to me, that the problem I had in the very beginning (3 weeks ago) was that my single 100W solar panel just didn’t have enough “juice” to keep these heavy-duty batteries topped up.
Everything appears to be working as it should...but I need AT LEAST another 100W of solar-grabbing capacity.
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Aug-01-2022 10:42 AM
red31 wrote:Qwazert wrote:
I don't believe I have any way of forcing this controller into BULK mode...it does that part automatically.
And I don't have any little lights...just an LCD readout.
Which exact Voyager do you have? Is it the waterproof one or ?
This one...
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Aug-01-2022 08:37 AM
750 Watts Solar Morningstar MPPT 60 Controller
2014 Grand Cherokee Overland
Bob
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Aug-01-2022 08:27 AM
Qwazert wrote:
I don't believe I have any way of forcing this controller into BULK mode...it does that part automatically.
And I don't have any little lights...just an LCD readout.
Which exact Voyager do you have? Is it the waterproof one or ?
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Aug-01-2022 08:08 AM
red31 wrote:
the little lights on the controller indicate when the controller is in BULK mode.
Bulk mode is the only mode where the panels full power goes to the battery. The panels should operate at approx battery voltage during BULK mode. As the battery voltage rises, panel operating voltage will rise to match that of the battery.
Other modes, power is limited to maintain a constant voltage. The panel is turned on/off to keep the voltage at a certain set point.
So the controller needs to be in BULK mode for your test!
I don't believe I have any way of forcing this controller into BULK mode...it does that part automatically.
And I don't have any little lights...just an LCD readout.
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Aug-01-2022 07:39 AM
Qwazert wrote:An MPPT controller will sort that out for you regardless of how they're connected.
As I understand things, connecting them in series will not be much of a benefit, since I need more charging CURRENT, as opposed to higher voltage.