I have a 48v lithium battery at relatively low voltages (12s nmc so 49.2v it is fully charged) which already shows that I cannot use most wind turbine controllers (because the output voltage is not configurable)
I want to experiment with a 48v 500w chine wind turbine. If it will only bring me 300w, that is fine, that is not the discussion.
Routing it through a Victron MPPT solar controller would mean it is part of the Victron eco system, which is convencient (although everything is called solar production)
What I want to do is use bridge rectifiers. Most likely 2 of them paralleled.
That way it already becomes a much higher DC voltage.
1 of the outputs goes into the Victron MPPT (a model that covers the max voltage).
The Victron MPPT I want to configure with a max current on the MPPT to match the expected output.
For example, configure 6 to 10 amp max in the settings. This is to stop the MPPT charger to search for even higher gains if I know the windmill cannot deliver.
Then, on the second bridge rectifier output, have some simple PCB which enables a dump load when the DC voltage gets too high. Possibly even short it.
The reason to use two bridge rectifiers would be that I can short it as a brake, without shorting the mppt terminals, because it will probably not like that.
Then, I would want to size the dumpload.
Shorting it can cause it too melt down I think, especially in storms. So I probably only want to manually short it if I want to disable it? (preparation for a storm or something)
So then, it would be better to have a dumpload exceeding the power output of the windmill.
It will be a 500w windmill, so I could choose anything higher than that.
Of course I will have to calculate it according to resistor value, because the rectified voltage is much higher than 48v. But I am guessing I can use some 48v dc heater, or just use 2 in series to be sure they can handle the voltage.
Does this make any sense?
And if I want to add a fuse, I should add it between the rectifier and the mppt solar controller. If it makes sense at all to fuse it at the wind turbine side.
I want to experiment with a 48v 500w chine wind turbine. If it will only bring me 300w, that is fine, that is not the discussion.
Routing it through a Victron MPPT solar controller would mean it is part of the Victron eco system, which is convencient (although everything is called solar production)
What I want to do is use bridge rectifiers. Most likely 2 of them paralleled.
That way it already becomes a much higher DC voltage.
1 of the outputs goes into the Victron MPPT (a model that covers the max voltage).
The Victron MPPT I want to configure with a max current on the MPPT to match the expected output.
For example, configure 6 to 10 amp max in the settings. This is to stop the MPPT charger to search for even higher gains if I know the windmill cannot deliver.
Then, on the second bridge rectifier output, have some simple PCB which enables a dump load when the DC voltage gets too high. Possibly even short it.
The reason to use two bridge rectifiers would be that I can short it as a brake, without shorting the mppt terminals, because it will probably not like that.
Then, I would want to size the dumpload.
Shorting it can cause it too melt down I think, especially in storms. So I probably only want to manually short it if I want to disable it? (preparation for a storm or something)
So then, it would be better to have a dumpload exceeding the power output of the windmill.
It will be a 500w windmill, so I could choose anything higher than that.
Of course I will have to calculate it according to resistor value, because the rectified voltage is much higher than 48v. But I am guessing I can use some 48v dc heater, or just use 2 in series to be sure they can handle the voltage.
Does this make any sense?
And if I want to add a fuse, I should add it between the rectifier and the mppt solar controller. If it makes sense at all to fuse it at the wind turbine side.
