# Help Combining Panels (pics)

**8**✭

I would like some help in determining how, or even if, I
should combine two panel sets I have installed on my motorhome and trailer.
Just to give you an understanding of what I have, here is a picture of my
setup.

As you can see from the photo, my 315 watt Solarworld panels are actually mounted on the rear door of my trailer, while I have two more Unisolar amorphous panels are on top of the motorhome.

I normally have the trailer with me, but occasionally travel with just the motorhome. I know I can use both sets of panels independently of each other, and that is what I currently do. But what I want to know is if I can, or should, combine them for more power when both the trailer and motorhome are connected. I have read of the drawbacks to combining different types of panels, but I am still a little confused as to if I could benefit from combining all of my panels as in the picture below.

I would like to know if these two panel sets are compatible in there outputs enough to justify combining them, or would this degrade the overall performance of the system?

I welcome your comments or suggestions.

## Comments

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1,220✭✭✭✭BTW you might also consider running these as 4 strings of 35V(ish) for your 12V system.

http://zoneblue.org/cms/page.php?view=off-grid-solar

8✭The only reason I was trying to use 2 strings instead of 4 is to keep the cables at a minimum. I am trying to keep the voltage high, and amps low. Not sure that this is the best way to go, but seems to be working for now.

I am glad you think this set up will work. Here are the numbers I used, along with the calclations as I understand them. Hope this is correct?

Set A (2 x Solarworld Panels in series)

Watts 630

Amps 9.3

Volts 73

Set B (2 x Unisolar Panels in series)

Watts 272

Amps 4.1

Volts 66

Total (Set A + B Wired in parallel)

Watts 884

Amps 13.4

Volts 66

So I think I am going to get 884 watts out of a possible 902 watts. Seems reasonable to me if my math is correct.

8✭Set A (2 x Solarworld Panels in series)

Watts 630

Amps 8.7

Volts 73

Set B (2 x Unisolar Panels in series)

Watts 272

Amps 4.1

Volts 66

Total (Set A + B Wired in parallel)

Watts 845

Amps 12.8

Volts 66

So I think I am going to get 845 watts out of a possible 902 watts. Seems reasonable to me if my math is correct.

Darn, I hope this is right this time?

175✭✭✭