Fried VFX 3524
About a year ago, I chanced on an Outback factory rebuilt VFX 3524 for a good price. My existing VFX 3524 had a board fault that would not recognize the Mate, but it worked fine otherwise. So planning to replace the board, then wire up both in classic stacking, I installed the rebuilt, and set the existing aside. So yesterday the rebuilt was acting weird, and I pulled the cover to find the negative post burned badly. Burned so badly in fact that when I tried to remove the 4/0 cable, the post came out of the inverter and its connections internally seem melted. Not good, and the cable to post connection was tight.
So out came old trusty for a reinstall, ( still have not gotten that board replaced.) Working fine, I have ordered a new cable but temporarily cleaned and am using the existing cable, and it is cool as a cucumber. So my question is what could cause such a fault? The 24-volt battery is not grounded BTW. Has anyone experienced such? Not being an inverter tech, my best guess is I will try to salvage the board out of the fried VFX3524, put it in old trusty and scrap the one that burned. Unless someone out there thinks the whole thing can be salvaged?
Off grid, all solar, passive and active ( winter wood heat supplements) solar DHW, no backup.
Array 1-- 12 Sunpower 250, Outback FM 100
Array 2-- 12 Sunpower 250, Outback FM 100
Well array 780w, 6 Kyocera 130 w with Grundfos sqflex 11 and cu200 to elevated storage, ( 2- 330 g tanks,) no battery storage at well
8 24 volt Battle Born Lithiums
Outback FlexpowerTWO, VFX 3524a