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 > Your search for posts made by 'Muddydogs' found 4 matches.

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RE: Solar wiring question

Found a good price on 8ga wire so I can go that route. I'll have to do some measuring because I just don't remember but looking at my order from a few years ago when I purchased the system it came with 40 feet of 12ga and I added another 50 feet. I cut the 90 feet in half and ran the lines off the roof and I remember I did have some waste when I got to the charge controller but not sure how much. But I'm all of 40 feet and probable a little move. Panels are at the rear of a 28 foot toy hauler thats all of 10 foot tall at the center fridge vent. I did extend the panel pigtails out a ways, probably had 3 foot of pigtail per panel. My reasoning for getting rid of the MC4 connectors is there out in the weather all year, buried under snow all winter and when they did fail it was a pain getting on the roof. I got the smallest guy in camp, backed the pickup up to the trailer, set a camp table on the tailgate then two of us boosted the guy from the table to the trailer roof. This was the second day of a 10 day hunt so I ended up running the genny way more then usual to keep the batteries up because the solar just wasn't doing good even after the guy fiddled with the connections. So I figure a weatherproof box with the cables in a bus or ground bar will be better then the MC4's.
Muddydogs 03/08/19 10:13pm Tech Issues
RE: Solar wiring question

Another question. I see I can get a 3 way MC4 connector, are all MC4 connectors the same? If I purchase a 3 way will my existing connectors of another brand hook up right? Or will I have fit issues between brands? My current MC4 connectors are from Windy Nation, they don't have a 3 way and to hook up 3 panels using there system looks like just to many connections to fail. Just wondering if I decide to take the easy way and just replace MC4 connectors instead of doing a combiner box. I have a bag of extra MC4's around someplace.
Muddydogs 03/08/19 09:07am Tech Issues
RE: Solar wiring question

I had to go look at what PWM and MPPT where again. 4 years ago when I first did this I studied up an knew a thing or two but have since forgot much of the info. The system worked and kept my battery's charged very well so I didn't have to think about it. I am using a PWN 30 amp controller. The Windy Nation P30L model.
Muddydogs 03/08/19 09:00am Tech Issues
Solar wiring question

Currently I have 2 100 watt panels on top of the trailer (VOC 21.6 volts, ISC 6.34 amps, VPM 17.4 volts, IMP 5.75 amps) with a 30 foot run of 12ga wire to the charge controller. Last fall my system stopped charging and upon inspection one or more of the MC4 connectors are not making a good connection. My plan is to remove the MC4 connectors and make a water proof bus bar box on the roof to connect the panels to the main line. I was thinking when I was up there that I should install a third panel. From what I can tell if I'm running the numbers right the 12ga wire will safety handle the max output from 3 panels but my line lose is high. If I switch the 30 foot of main line to the controller to 10 ga am I really gaining a lot with line loss? Will I be getting anything extra by adding a 3rd panel? Looking at a wire table it appears that even going to 4ga wire won't get me down to a 2% loss for my run length.
Muddydogs 03/08/19 08:35am Tech Issues
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