Set all of your C-40 cycle settings so it's higher than what your settings are on the inverter. Then the other controller just a bit higher than that one and you should be dumping only when the gene isn't running and only when your R-E is producing to much. I have the same controls and it works fine as long as your dump load is big enough. Your mill will reach higher rpm at the top of the bulk charge. Your inverter will shut off the gene. The inverter will use all your R-E and less of the gene power as the bulk cycles. If no R-E then it will be all gene. When the cycle is done and you get a lot of wind the inverter will have shut off the gene and the mill will speed up just a bit more to reach the C-40 setting and turn on the dump. The mill will be protected from over speed and the batteries will be protected from over voltage. Your second C-40 needs to be set just a tad higher in voltage than the first one. This voltage setting should be what your battery bank should be figured for, or slightly higher on your second controller. Another thing you need to do is program the rate of charge so it's equal to the size battery bank you have. The inverter will try to throw high amps at the batteries which can over float the batteries and make the voltage appear to be higher than it is and set of the C-40's. Your manual will have a way to figure it out. With four L-16's the max setting is 15 amps of 110. The inverter can push 30 amps on the grid charge mode which I use and not the gene, but if your gene puts out a lot of amps you may need to set that so you don't boil your batteries, and have your dump on while the gene is running. It's an intricate system, but it works excellent! Read and reread your manual. Especially the modes you are using. That inverter manual is long and boring but it's the ticket.