- Mar 7, 2018
They have 3 pots on the units, one to set the output current limint, one to set the maximum voltage output level and the last one, which is the critical one, is the low voltage cut-off input level.I am hopeful they will work in the future, but so far they have not done what expected.
With the 24V turbine I had, I realised that in low winds the "usefull" (wind speed) starting voltage was 16-18V. So, when the wind was low speed I would have the input voltage level set at 18V. This would then limit the input voltage to 18V as it would then increase the input current (within the output volts x amps setting). This would cap the voltage level, but the turbine is just torque, so although you do loose a bit of efficiency the simplicity factor for me was far more important. I needed the ability to have cheap spare parts as I was 150 miles from the nearest large town as such, so I could have a few of these boost units for various tasks.
When the wind speed increased (first stage) I would either adjust the input voltage level or switch to a different boost unit with a higher input voltage level of say 28-35V. This would then keep the input current within the wind turbine coil rating so as not to burn it out.... then when it got really windy I would just attach the turbine directly (via 3 phase bridge rectifier of course) to the battery pack at say 52V. This does loose some watts between gusts as the turbine was a "24V" unit but having it deliver an average of about 500W was more beneficial than shutting it down.
The other main poiint here is that I tied the turbine so that it could not change direction as when the blades were spinning around 1000rpm if it turned the stresses would just break the blades off. This is what damages the majority of cheap units, they spin up, turn and watch the blades fly off.... that is if the turbine is not burnt out because the current is not limited correctly...
I'm guessing those wood blades will last upto about 500rpm.... the bolts and the lack of a plate to distribute the stresses is your weak point... remember, early aeroplane propellers were only spruce, so they can take a lot of power if mounted well.. good luck !