That's probably more detail than anyone needs, but I'd rather get it all out there initially.
Short story: I'm trying to get the BMV's measured battery current to drive the Quattro's charger current regulation. I have a large DC system, which can draw more than the batteries' rated charging current, so the Quattro's own DC output metering isn't appropriate.
Long story: I'm not running on battery for very long, just minutes between killing shore power and switching to engine/generator power, so I don't need a huge battery bank. The 4 batteries here barely fit anyway. The Power-Sonic datasheet says up to C/5 (20A per battery, 80A for the bank) is acceptable. Still, 80A is way lower than the DC system, which can draw over 100A when everything's active.
I have a CCGX, which talks to the BMV and SmartSolar over ve.direct and the Quattro over ve.bus. It seems to understand the SOC from the BMV, and it does the math to figure out how much "DC system" load there is, but I can't figure out how to feed this info back to the Quattro to actually control its DC charging output.
I'm totally fine with short transients, like if the DC load goes away and 200A suddenly gets shoved into the batteries. They should be able handle that for a few seconds, just not hours at a time.
Is this what DVCC is meant for? Is there an assistant I should be using?
Thanks in advance for any hints!