Aloha. I have a system comprised of (2) MPPT 75/15 controllers in parallel to a 24V bank with a BMV. Each charge controller is fed by (3) 100 watt 20V panels. This system powers dual electric boat trolling motors which are wired directly to the batteries and not to the Load Outputs of the controllers.
My question is, when should the charge controllers switch to Bulk mode? Do they have to see a specific load or a load for an amount of time before switching?
I thought they would switch from Float to Bulk if the voltage of the bank fell below the set threshold, but during mid day sun while both chargers are in Float mode with fully charged batteries, if I turn the motors on and draw a load the chargers do not switch to Bulk to offset the amperage draw which causes the voltage of the bank to drop. I can see this on the BMV. I would have thought a load causing voltage drop below set float value would have caused the controllers to switch to Bulk?
I have tried networking and resetting all devices and double checked all settings.
Thanks!