OK, I've been doing a bunch of testing using a small 100 ah, 12VDC deep cycle battery with a small wind turbine and the charge level of the battery is driving me nuts. The simple question is this…can a discharged battery bring a turbine into stall at the top end, where a “more charged†battery would allow it to power through? I seem to be getting very different peak power results if the battery was 11.3VDC at rest versus 12.5VDC, however there are other variables that I'm also playing with that may affect top-end so I wanted to eliminate this one.
It sort of makes sense that allowing the voltage to rise can keep a turbine on peak longer (isn't this how MPPT works?), so if the battery voltage is lower due to charge level it could cause the turbine to stall. Keep in mind that this is a small battery and the turbine could be on the edge of stalling anyway at the top end, so could the battery push it into stall?