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bodhiray avatar image
bodhiray asked

Cooked Controller?

I have had a MPPT 250/100 charging 48v SLA batteries for 2 years now working excellent. We recently upgraded to Li batteries. During the switch out I disconnected battery and pv. I reconfigured the charging parameters for the new pack chemistry. When I reconnected the MPPT to battery I did it backwards — last thing I did was turn on battery at disconnect between MPPT and Battery — BLUE FLASH — sparks, smoke the whole nine wafted out of the MPPT. Trouble shooting I found that my on/off switch at PV combiner box is not putting energy through in either on or off position. Any advice to trouble shoot further is much obliged.

I do have a standby 150/100 MPPT I can put in it’s place but this requires reconfiguring my PV and I would like to avoid that. Will do it thought if I’ve reduced the 250/100 to a paper weight...

MPPT Controllersmppt charging
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2 Answers
seb71 avatar image
seb71 answered ·

It's dead, Jim.

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Guy Stewart (Victron Community Manager) avatar image
Guy Stewart (Victron Community Manager) answered ·

Hi @bodhiray,

Sorry to tell you, connecting the MPPT with reverse polarity to the battery is one of the few near certain ways to destroy it.

Another is connecting it to a PV array with a voltage higher than the maximum.

Those are the 2 most common installation faults that will destroy a Victron MPPT that I see.

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bodhiray avatar image bodhiray commented ·

So far as I understand the only “backwards” part of the installation was that I connected the battery second as in after the PV connection. Polarity is correct and well under voltage.

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