Hello Free,
I'm not sure what your normal charging source is that needs the diversion load, but I assume that it is not producing now, and this is why you are equalizing with your generator.
As long as you are sure that your primary source will not produce too much so that your batteries will gas too much during equalizing, a simple solution is to just flip the breakers off on your C60s; this will of course disable their diversion function, just be sure to keep an eye on the operation just in case your normal charging source should start doing its thing.
Another possibility (and a bit safer and hands off) is to push the manual equalize button on one of the C60s, while turning the other off (flipping its breaker). This will allow the equalize voltage that you need, and will regulate it from producing too much. I don't know much about the charger in your ProSine, but I would trust the equalize function in your C60s more. Anyway, if you can set the max amps that the charger will allow through, just set it below your diversion load from one C60, and set the charge controller voltage regulation above the C60 regulation (something above 15.2 V should do it). This may waste a bit of generator power, but you can play with the max amps that the charger allows through to lessen this.
Best,
Dave
