I am not sure now, but in times past, sometimes you could find the NEC manual in a city/county code archive. Their law required access to the code without having to purchase the book.-Bill
one is needed PER solar panel, & you need a transmitter or bleed down box which adds another $100 to $250 which means a 10K system is going to cost about $2300 more, or $0.23/watt. if the local permit department requires a combination disconnect box those are $700 to $800 and if they require a birdhouse those are $250 more.
why spend $3000 on all of the above if one can just build a pergola instead? Now granted Pergolas that big will cost $3000 in materials, and if you pay someone to build it, you are looking at $10,000 or more. And engineered drawings will cost $1000. so not really cheaper unless you DIY.
Seems like ground mount systems are going to become more appealing given the cost for this NEC 2017 requirement.
Pretty sure that is now the requirement! the sma RSS module appears to be 2014 compliant, but not 2017.
This new code is a huge boost to using micro inverters instead of central string inverters. Basically the tables have been flipped micro inverters will now be cheaper then string tie inverters, which have historically always been less expensive.
The bleeder box is not necessary unless the inverter itself does not do that automatically. We had to build that box for the inverter or two we had tested with that lacked the 30 second bleed down. I think most of them bleed themselves down now. They also have to bleed down from PV+ to gnd as well as PV- to gnd and some did not do that either. The non-isolated ones basically had that problem.
This whole module level bleed down thing I think was overblown. Just when solar was getting cheaper, they have to step in and screw that all up.
Second system 1890W 3 × 300W No name brand poly, 3×330 Sunsolar Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah LFP 24V nominal battery with Daly BMS, used for water pumping and day time air conditioning.
5Kw Yanmar clone single cylinder air cooled diesel generator for rare emergency charging and welding.
You can always try and discuss it with the AHJ. They often are reasonable for Offgrid. Sometimes, you just have to do it and fix it later
E-mail [email protected]