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

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

You should also check the AC wiring. AFCI is detected as radio frequency noise from some kind of arc fault. It can be either AC or DC arcing. I had some AFCI tripping issues that turned out to be loose wiring at the AC connector inside the SunnyBoy. It was easily fixed by tightening the screws.

[RE-wrenches] Magnum issues?

I’m in Canada, on the west coast, and while the supply chain issues over the last 2 years with Magnum inverters were severe they seem to have eased over the last few months. However I have just had a local service depot tell me that repair boards are unavailable and to get back to them in 4 - 6

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

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

Friends: We installed a bunch of Shell SQ-150-PC modules on a ground mount almost 20 years ago. The original SB2500 inverters died so we upgraded to SB4000US-21 inverters. We had some ground fault or AFCI issues a number of years ago so we replaced all homeruns with PV wire which resolved the