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Old 07-27-2022, 10:56 AM   #1
Whiskey.Wilderness's Avatar
Join Date: Nov 2020
Location: Colorado
Posts: 53
Year: 2001
Coachwork: International
Chassis: 3800
Engine: T444E
Rated Cap: 29000 GVWR
Need advice on combiner box

Ok so we have a 24v system and purchased the eco worthy PV-4 combiner box.

The question is how to wire our panels to go into it. Do we need to wire them in series first then run that into the box or just put them into the box in parallel
Here is specs on our panels (listing says 12v but these are the specs from the info on it) we just don’t want to mess this up and want to be sure before wiring it.

Max Power Output(W): 210W
Voltage MPP Vmp(V): 16.77V
Current MPP Imp(A): 12.48A
Voltage Open Circuit Voc(V): 19.83V
Short Circuit Current Isc(A): 13.09A

Any help would be appreciated.

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Old 07-27-2022, 01:22 PM   #2
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Join Date: Apr 2019
Location: SW USA
Posts: 2,064
Year: 2003
Coachwork: IC / Amtran
Chassis: CE300
Engine: International T444e
Rated Cap: 23
Well, you definitely want your panel voltage to exceed your bank voltage. So at a minimum you need to wire each pair of panels in series, and then parallel each of these pairs together. 12v nominal panels aren't the best match for a 24v bank for this reason. Not that you can't make them work as described. But if you had higher voltage panels, you could wire them all in parallel individually, giving you better potential performance in partial shade conditions.
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