Good Sam Club Open Roads Forum: Tech Issues: 24 V Solar Panel(s)
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BFL13

Victoria, BC

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Posted: 05/08/21 09:32am Link  |  Quote  |  Print  |  Notify Moderator

Not clear, but the OP must know he can't put the 12v 170 in with the 24v panels. I think he wants to keep the 170 with PWM and get a 24v set with an MPPT and use both controllers in parallel on the battery bank.

That's what we do in the C. Two controllers, one PWM and one MPPT. Just set the Vabs at the same voltage in each controller so they add their amps.


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PerryB67

Lanesboro, Minnesota

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Posted: 05/08/21 01:47pm Link  |  Quote  |  Print  |  Notify Moderator

BFL13 wrote:

Not clear, but the OP must know he can't put the 12v 170 in with the 24v panels. I think he wants to keep the 170 with PWM and get a 24v set with an MPPT and use both controllers in parallel on the battery bank.

That's what we do in the C. Two controllers, one PWM and one MPPT. Just set the Vabs at the same voltage in each controller so they add their amps.
The 24v panels would be controlled by our Victron 100/30 controller that is currently hooked to our 170 watt panel. You can't/shouldn't combine 12v and 24v to the same controller.

I would pull another set of wires to our dinette where the controllers live to the original factory installed GoPower PWM controller for the 12v 170 watt panel.

I also have a 100 watt portable that is controlled by a Victron 100/20 controller. So I would have three different panel types run by three separate controllers. As you know, it works.

The first thing I would do is install one 12v 200 watt panel and hook it to the Victron 100/30 controller, leaving the 170 watt panel on the roof. Then a month or so later, pull wires for the 12v 170 watt panel and reinstall the GoPower controller.

I have more room for controllers than extra real estate on the roof for panels.

Down the road I would install the second 24v 200 watt panel and parallel with the other 24v panel to the controller. And yes, I will buy two 24v 200 watt panels at the same time.

Enjoy,

Perry


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BFL13

Victoria, BC

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Posted: 05/08/21 02:34pm Link  |  Quote  |  Print  |  Notify Moderator

If possible, IMO, use the Victron 100/20 for the 170 and put the portable on the PWM.

StirCrazy

Kamloops, BC, Canada

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Posted: 05/08/21 07:05pm Link  |  Quote  |  Print  |  Notify Moderator

PerryB67 wrote:




With more watts on the roof, and 24v to gather sun longer in the morning and evening, a 24v panel makes more sense to me than a 12v split cell design. YMMV. Our panels (two 24v 200w and one 12v 170w) would be situated in the front, middle, and rear of the camper. Location on the roof also helps with shading.

Enjoy,

Perry


um the split cells I am talking about are 24V, I didnt even know they made a 12 volt split cells.


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PerryB67

Lanesboro, Minnesota

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Posted: 06/04/21 07:24am Link  |  Quote  |  Print  |  Notify Moderator

In the end I only have room for one 24v panel and did not like how the panel would be mounted. I failed to account for the large overhang of the Maxx Fan, reducing the available space to less than 22" so the second panel was not possible.

I decided on using three, 41" x 20" 100 watt Renogy panels wired in parallel along with the existing 170 watt GoPower panel. The four together, allowing for the slight mismatch of VMP, will give us 463-465 watts on a perfect day that never happens. The two rearmost panels can easily be shaded by the AC and Maxx Fan in January/February preventing wiring in series, but two of the new panels will never be shaded by the AC or the Maxx Fan, giving at worse case 200 watts.

I really did not want to add a second set of wires to connect the 24v panel to one of the Victron controllers, especially since I could only add one 24v 200 watt panel to the roof for only 370 watts. If I could have added that second 24v panel the choice was clear, but in the end that was not possible.

Thanks for your input,

Perry

* This post was edited 06/06/21 09:01pm by PerryB67 *

pianotuna

Regina, SK, Canada

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Posted: 06/04/21 07:46am Link  |  Quote  |  Print  |  Notify Moderator

Hi Perry,

Let us know if it meets your needs!


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, soon to have SiO2 batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

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