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Is that middle junction box swappable with one of the other junction boxes? I see it has some thing that resembles tabs but I don’t wanna go prying at it if they’re not made to be swappable. I’d hate to tear up a brand, new soap, panel and wreck the thing. I read the instruction manual for...

I'm connecting EMT into the plastic junction boxes and my understanding is I need to use grounding bushings because the box is plastic and the EMT needs to be grounded. Problem is I don't have enough neck on the Raintight connector to screw the bond bushing on. If I take off the lock nut then...

I've got a microinverter setup I'm installing. It has two 30 amp branches. For splicing in j-boxes are terminal blocks on DIN rails the way to go? Any code requirements for the splicing method to keep in mind?

I've been doing a lot of reading and have realized there are different types of grounding requirements and I may be getting stuff mixed up. Is there a "standard" method for grounding a rooftop array with microinverters (hoymiles HMS-1600-4T) that have a ground wire in the trunk cable ? My...

I’m shopping around for my 3/4” EMT conduit parts and could use some help sorting out what I can and can’t use for conduit bodies. My inspector wants the fittings to be rain tight. It seems like all the threaded conduit bodies are rigid. Can I use those with EMT tubing and RT fittings or are...

I have plans with 3 different arrays on 3 separated branches. Grid tied with microinverters. For grounding the racks I'm planning to use #6 bare copper and then transition to thwn-2 in junction boxes into conduit. I'd need to do a few transitions, something like this...

I have 3 circuit branches and solar panels on 4 different roof sections. I'm trying to plan out the details of the junction boxes, conduit runs, and wire transitions and could use some help! Attached are a few images showing what I was initially thinking with the conduit runs. The junction...

Anyone have a scanner they could recommend for use on an asphalt roof to locate rafters? How accurate are the Bosch D-Tect series, the Hilti PS 38, or other scanners on a single layer asphalt roof?

I have a roof plan with Hoymiles microinverters and I was planning to have two arrays on separate wiring. Each would need a 30 amp breaker. I'm having a little trouble figuring out the combiner box. For permitting, do I need to have a UL listed box specifically for PV systems? When I'm...

Does anyone have experience submitting plans using the rack manufacturer's engineer letter? I submitted my building plans with the snapNrack letter and got it rejected with a comment saying all building plans are "missing seal and signature by professional engineer." I didn't include the span...

I had a nice conversation with a potential inspector on my project however we did come across one stumbling block. He was calculating the 120% rule based on my bus bar rating regardless of my main breaker size. My understanding is the code is pretty straight forward “Bus or Conductor Rating...

For running wire from the microinverters to the backfeed breaker can I just run straight to the backfeed breaker? For permitting purposes I don't need a rapid shut down, the microinverters cover it. For functional purposes can I just run all my wires to the needed junction boxes, into the...

I'd love to get some feedback on my current electrical planning & permit diagram. Plans are for (30) 400w solar panels with (15) AP Power DS-3 microinverters. A 30 amp breaker can take up to 9 DS-3 micro inverters. I'd derate the main breaker to 175 and putting in (2) 30 amp breakers. Do I...

Could you recommend any sources for deals on racks and mounting hardware for asphalt roofs? I'd also love to hear about the pros and cons of the various options, particularly using flashing mount hardware vs a quickmount. In terms of codes/regulations is there anything I should keep in mind as...

I’d like to put up a 10 - 12Kwh panel array. I’m trying to figure out what the cost effective path is for me to do my grid tie - derating my main breaker, upgrading my breaker, etc. How did you do your grid tie and what did you find to be the right solution for your install? My current panel...

I’m in Maryland and working out how to get a permit. A couple questions… Are there any service providers you can recommend that do the permit work so I can get a permit? Are there any major drawbacks to purchasing Panels, racks, and Microinverters before I get a permit? Or should I hold off...

Hi all, I'm looking at doing a DIY solar panel install on my roof. My roof is a ~ 4:12 pitch with asphalt shingles. I've come across Bi-Facial panels that are on sale - cheaper than similar panels of the same advertised wattage. Is it apples-to-apples to compare a Bi-Facial panel , for...