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705.12(D)(2)(3) (d). Connections shall be permitted on multiple-ampacity busbars or center-fed panelboards where designed under engineering supervision that includes fault studies and busbar load calculations. The following subsection is not present in the printed NEC textbook but was added by...

I am having fits with the state's energy commission not recognizing my battery technology for my small grid tied system. Can they tell if I have batteries connected to a string inverter?

Thank you!! My inverter is certified as CA Rule 21 and UL 1741 Compliant. Would that not take care of the important concerns you raise? In my state, the Powco has two permit streams for home PV with battery backup. 1. For inverter, modules, controller, etc. 2. A separate one for batteries...

A licensed electrician who probably didn't know that much about solar (not that I do!) told me I needed a line side tap. My residential service is single phase, 125A busbar with 100A overcurrent protection. The mains are underground and the transformer is not that clo$e. :>( I would prefer not...

I will have six conductors coming from three strings going into my future combiner. I want to transition the wires to THWN. If I pre-connect everything upstream, presumably they'll be carrying 90V Open Circuit @ 10 ADC. How do I deal with this? A. Do it at night? B. Hold off connecting the...

Hearing opposite things from two electricians whom I respect. Background Main panel: 125 amp busbar 100 amp overcurrent / single phase Conductors from the Powco feed into the centerfed busbar, not lugs or breaker on top. Inverter: 4000 Watts/50 amp OPD, so 50 amp Breaker for inverter on...

Right! I was thinking of circuit breaker sizing vs. continuous loads.

Thanks! IF I had to go the lineside tap route, are any of you familiar with what Pacific Gas Electric calls Green Meter Adapter? San Diego has something similar: Renewable Meter Adapter. As I understand it, they attach it to the meter and it takes solar current and moves it upstream of the main...

Thanks, Hedges! I asked about that as you were posting. I appreciate your confirming it.