sbalak
New Member
I need some help to understand AFCI (arc fault circuit interrupter). My setup consists of 3 strings. Each string contains nine (9) 400w Canadian Solar panels. I use Tigo RSS shutdown modules. The first 8 panels use 4 Tigo TS4-A-2F modules, but the 9th uses a single TS4-A-2F module. All the panels are on the same roof face so they all share the same ground. I have a 10kw Growatt inverter (MIN10000TL-XH-US) is errors out for a ground fault (200 AFCI). Growatt support has said they're having some issues with AFCI and so I've done a couple rounds of firmware upgrades and settings changes, but ultimately I can't reach 10kw of consistent performance.
I'm trying to track down if I actually have a ground fault or if I have an inverter problem. Each of my strings outputs about 297v. When I measure negative to ground for each string I get between ~1.0vdc to 0.08vdc. I think the variation is due first string's positions on the roof. The highest makes slightly more than the middle. The middle makes slightly more than the bottom.
Is some voltage between negative and ground "normal" or since it's no 0.000 this confirms I have a ground fault?
Thanks for the help.
I'm trying to track down if I actually have a ground fault or if I have an inverter problem. Each of my strings outputs about 297v. When I measure negative to ground for each string I get between ~1.0vdc to 0.08vdc. I think the variation is due first string's positions on the roof. The highest makes slightly more than the middle. The middle makes slightly more than the bottom.
Is some voltage between negative and ground "normal" or since it's no 0.000 this confirms I have a ground fault?
Thanks for the help.