Hello there!

I’m sure this technical question has been asked many times, but I’m hoping I can obtain a definitive answer prior to installing a Solar array as PV Input for my Bluetti AC300.

Specs say dual MPPT inputs, 150 maximum maximum volts, and 1200 watts maximum power, each input.

I was thinking of stringing for each PV input, three max open circuit 40.7 PV panels in series (122.1 max volts / 10.76 amps max output current) and paralleling a second set of three panels, which would equal a max combined PV output of 122.1 volts / 21.52 max amps output, or 2628 max watts of available PV power output. My Solar tech tells me this will exceed each of the AC300’s max PV inputs of 1200 watts, and damage the unit.

My understanding is that the Bluetti’s MPPT will regulate input current based on input voltage, ensuring the maximum power input of 1200 watts is not exceeded, with any excess power available from the Solar Array simply remaining unused. Otherwise, under typical seasonal, time of day or weather related lower light conditions, it would seem to me that one would rarely achieve the ideal voltage / current / power conditions and obtain anything close to the rated 1200 watts PV input.

Basically my installer is telling me I can only hook up a maximum of 3 40.7 max volt open circuit /10.76 max amps panels in series per PV input, in order to meet the maximum voltage, current and “power input” specification. That would be the absolute maximum power out available from the combination of three panels, under perfect high light conditions. Otherwise, my installer suggests paralleling a second string of three panels will input far too much current / power, and fry the MPPT controller.

Looking for clarification on this point prior to installing and configuring my Solar Array.

Cheers!