MPPT overheating code #26

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Dennis Leth Andersen asked Feb 27, '22

MPPT overheating code #26

Hi all,

I have a MPPT 250/100 connected to a 48V battery bank, and 6,7kW solar panels. The last days I got an overheating alarm, and the solar charger shuts down for about 30 min and reset its self. The alarm code #26 indicates the battery terminal is overheating and appears after 2-3 hours of full load/100Amp. I have used a 35mm2 cable for the connection. The cable get really hot. Last time 100degC. Only the first 20 cm of the cable are hot.

I think its a connection issue.

What can I do to get rid of this.

MPPT Controllers connection issue

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Answer 1 · 2022-02-27T20:37:08Z

boot103 answered · Feb 27, 2022 at 08:37 PM

Make sure there are proper crimps on the cable and make sure they are nice and secure. Loose crimps and loose connections will cause heat.

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Answer 2 · 2022-03-01T16:13:13Z

Dennis Leth Andersen answered · Mar 01, 2022 at 04:13 PM

Hi. I have now re-fitted the cable with new crimps and it seems to have reduced the hot connection a lot now. Only 44 degC.

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Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

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