I'm running a two-week test to prove compatibility of a module level rapid shutdown system with DC/DC converter at the recommendation of the manufacturer. Circuit = PV -- DC/DC -- MPPT -- LFP Battery -- Loadbank (as needed to keep room in the battery). PV is 10X 235W panels. DC/DC is 500kW (I know those don't match in real life). MPPT is Victron 250-100 which is built into a 60 KVA energy storage system which is serving as the load in this test. I don't care about efficiently as we will be dumping the power. My Victron related question is: Will the Victron MPPT fault with the third party DC/DC between the PV and MPPT? Basically, the DC/DC converter will act like a DC power supply. We will set the output voltage and it will supply the MPPT at varying amps but fixed voltage depending on the PV output. The DC/DC converter does the MPPT. The test needs this specific DC/DC as this is what we are looking to prove the rooftop module level rapid shutdown. As such, the Victron MPPT will not be able to move input voltage like it normally would. Problem or no? I realize I'm doing something with the MPPT that it was not strictly designed to do but am hoping it will work as it is all equipment we have on hand. Collective wisdom appreciated.
