question

janvi avatar image
janvi asked

Other power sources than PV for MPPT regulators

MPPT RS 450 data sheets contain the footnote comment regarding the max PV short circuit current: "2) A higher short circuit current may damage the controller if PV array is connected in reverse polarity"

Does this mean opposite that I am able to connect other sources to the PV input. I have a 350 Volt vehicle battery what I could use to support my 48V system over the night. Charging is done with vehicle charger.

There seems no sufficient answer to very similar question 55662. The question seems also interesting for 80V batteries and smaller MPPT Models without galvanic isolation. I know, this is not possible with any PWM regulators. They dont contain inductors for current regulation and their operation relies purely on the PV intrinsic resistance.

https://community.victronenergy.com/questions/55662/about-new-inverter-rs-486000.html


MPPT Controllerscurrent limitinput current
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1 Answer
Alexandra avatar image
Alexandra answered ·

@Janvi

The mppt sometimes shorts its input to prevent overcharge of the 48v battery. In that circumstance with the EV battery being an (almost) infinite current source (way over the short circuit ability) I would imagine alot of smoke would come out.

https://www.victronenergy.com/live/mppt-error-codes see erorr 29 onwards for more explanation.

If you have a way to current limit the output of the EV battery it could work, but definitely outside of recommend operation use and not supported.

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