September 12, 20196 yr Hi All, Seems my friend has been getting this error frequently since this weekend. "Err 26 - Terminal overheated Power terminals overheated, check wiring, including the wiring type and type of strands, and/or fasten bolts if possible." Obviously nothing seems obviously wrong or has been fiddled with since the install, about 2 months ago. He only has a single MPPT, so no DC combiner box, would adding one perhaps help with the issue?
September 12, 20196 yr The 150/100 can handle a LOT. Idea 1: If mine gives that error, I would immediately check every connection to and from the MPPT. 2nd idea: What cable sizes have been used between the MPPT and the panels / batts? Reason I ask is because on my 24v system I used 16mm2 cables between MPPT and Inverter. I could feel them heating up a bit, and that was on <30cm length. Now I have 25mm2 on there. Also, when the error shows, how hot is the actual unit? Can you keep your hand on it for 10sec?
September 12, 20196 yr Author 2 minutes ago, The Terrible Triplett said: The 150/100 can handle a LOT. Idea 1: If mine gives that error, I would immediately check every connection to and from the MPPT. 2nd idea: What cable sizes have been used between the MPPT and the panels / batts? Reason I ask is because on my 24v system I used 16mm2 cables between MPPT and Inverter. I could feel them heating up a bit, and that was on <30cm length. Now I have 25mm2 on there. Also, when the error shows, how hot is the actual unit? Can you keep your hand on it for 10sec? It happened yesterday at 10 again, so not really heat of the day. On Saturday it was just after 12. He wasn't home for either of them, so can't say how hot it got. I will ask him about the cable size and check if everything is fastened. He is not even hitting 100A, closer to 80/85, so don't think it is really working that hard
September 12, 20196 yr 12 minutes ago, PaBz0r said: ... 80/85, so don't think it is really working that hard ... Mine was too hot to touch on 45amps. So on 80/85 it is WORKING! 🙂 My gut feel is it is cables that got lose or are too thin for the 80/85 amps.
September 18, 20196 yr Author Ok seems it was one of the MPPT terminals that wasn't very tight. Error has not yet returned and cables on roof was also checked to make sure it they are also fine.
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