Re: [RE-wrenches] AFCI tripping on SB 4000US-12

Comment below - -- Martin Herzfeld, Interstate Renewable Energy Council (IREC) Certified Master Trainer™ Emeritus California Solar & Electrical Contractor License #00833782 C-46, C-10, C-7, C-61 - D-56, D-31 Solar, Electrical, Tren

Re: [RE-wrenches] AFCI tripping on SB 4000US-12

William, If you swap strings, does the fault stay with the string, or with the input? and if you do run without the string for a while can you determine that the arc faults stop? Just figure it is worth making 100% sure the fault is actually in the DC side of that one string you have isolated, and

Re: [RE-wrenches] AFCI tripping on SB 4000US-12

Hi William, Modules can be meggered individually in or in series strings (with a caveat). I've done it many times and discovered internal module shorts between positive and gnd,or neg and gnd. I once took the customer's garden house up on the roof, and meggered a string, while trickling water on p

Re: [RE-wrenches] AFCI tripping on SB 4000US-12

Hi William - Is this a TL-21 inverter line from maybe 8 or 10 years ago? If I recall correctly, that was around the time period that SMA was first shipping with AFCI detection - we h