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createthis avatar image
createthis asked

SmartSolar MPPT 150/70-Tr Err 40

I accidentally connected my battery to my MPPT 150/70-Tr's PV input and my PV input to the Battery connection yesterday. I left it that way overnight. I woke up this morning to a flashing Error 40 code. The user manual says:

Error 40 - PV Input failed to shutdown If the charger is unable to turn off the PV input, it will go into a safe mode in order to protect the battery from over-charging or having a high voltage on the battery terminals. In order to do that, the charger will stop charging and disconnect its own output. The charger will become faulty.

Is this unit toast now, or is there a way to reset it?

MPPT SmartSolar
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michelg answered ·

Hi, try to disconnect everything, then reconnect the battery bank first at the correct connectors, then the PVs.

It may work. If not, then your mppt is probably toasted.

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createthis avatar image createthis commented ·
Same result. Err 40. Are these units repairable, or is it just a $600 brick now?
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kevgermany avatar image kevgermany ♦♦ createthis commented ·
Contact your dealer. Might be an easy fix, but needs to be checkedrepaired properly.
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