Do you have low wind and can't get up to charging voltage??
Try SERIES / PARALLEL wiring for battery charging.
Here are just a few of the tricks -
When wiring up your wind turbines ALWAYS run two separate wires
per EACH wind turbine ALL THE WAY DOWN to the battery pack area.
This way you can diagnose each turbine individually and fuse them individually
and manipulate the power individually with MUCH more control.
BATTERY CONFIGURATION OPTIONS WHEN USING
WIND TURBINES IN LOW WINDS
Shows both 12VO (volts out) and 24VO (volts out) configurations.
FOR PEOPLE WITH TWO WIND TURBINES
CHARING TRICKS FOR PEOPLE WITH LOW WIND.
Bottom right - Using a 24 volt rated turbine to charge 2 battery's and use a 12 volt power inverter.
BATTERY CONFIGURATION OPTIONS WHEN USING 24 VOLT or 48 VOLT WIND TURBINES
(with insulated negatives)