I gave up trying to use a car alternator as a wind turbine generator, and simply bought a purpose-made PMA generator as a base for my wind power project.
Some idea of the characteristics of the generator (some figures manufacturer-given, others interpolated & guesstimated, I imagine also the actual blades I end up using would affect the figures to a greater or lesser degree):
The output of the generator is via one positive stud terminal, and the aluminium case as the negative line.
The SLA bank I'm using is four 12V 110Ah deep-cycle leisure batteries in parallel.
Thinking about a control setup, I thought I might need the following features:
- I have many days of very light winds so often, a voltage boost might be useful (even though it might only deliver the lowest of trickle charge)
- despite that, I do get plenty of very gusty weather so a buck function to keep the charging voltage down to something good for the 12V SLA battery bank would be useful (rather than a simple regulation by just 'throwing away' anything above say 13.8V)
- some function to either dump through a heater, or simply switch off, the charge current once the SLA bank is full
- some function to keep a lid on the charge rate of the SLA bank under the windiest conditions
- some function to apply a brake to the rotor hub at generated voltages above say 70V to try and avoid bearing etc. damage in storms. Maybe just a control voltage to actuate a mechanical brake or something
Problem is, I've searched far and wide on Ebay and I can find all these features, but never all together in one unit capable of handling sufficient power. None of the individual solutions I've come across seem readily interfaceable with each other so I guess I'm going to have to try home-brewing something, unless I can find a supplier of a perfectly matching all-in-one controller
I have allsorts of ideas running through my head involving high power relays, zener diodes, buck/boost converters and water heating elements
If anyone has any ideas, suggestions, links to suitable products etc I'd be interested & very grateful to hear.
Some idea of the characteristics of the generator (some figures manufacturer-given, others interpolated & guesstimated, I imagine also the actual blades I end up using would affect the figures to a greater or lesser degree):
Code:
wind (mph) rpm V A W
scale
0 (0)
1 (<4)
2 (4-7) 10 1 0.1 0.1
3 (8-12) 32 3 0.36 1.08
4 (13-18) 75 6 0.75 4.5
5 (19-24) 150 12 1.5 18
6 (25-31) 300 25 4 100
7 (32-38) 500 43 7 301
8 (39-46) 750 60 10 600
9 (47-54) 1000 70 11 770
10 (55+) elec / mech damage if unsecured.
11 braking reqd above 1000rpm / 70V
12
The output of the generator is via one positive stud terminal, and the aluminium case as the negative line.
The SLA bank I'm using is four 12V 110Ah deep-cycle leisure batteries in parallel.
Thinking about a control setup, I thought I might need the following features:
- I have many days of very light winds so often, a voltage boost might be useful (even though it might only deliver the lowest of trickle charge)
- despite that, I do get plenty of very gusty weather so a buck function to keep the charging voltage down to something good for the 12V SLA battery bank would be useful (rather than a simple regulation by just 'throwing away' anything above say 13.8V)
- some function to either dump through a heater, or simply switch off, the charge current once the SLA bank is full
- some function to keep a lid on the charge rate of the SLA bank under the windiest conditions
- some function to apply a brake to the rotor hub at generated voltages above say 70V to try and avoid bearing etc. damage in storms. Maybe just a control voltage to actuate a mechanical brake or something
Problem is, I've searched far and wide on Ebay and I can find all these features, but never all together in one unit capable of handling sufficient power. None of the individual solutions I've come across seem readily interfaceable with each other so I guess I'm going to have to try home-brewing something, unless I can find a supplier of a perfectly matching all-in-one controller
I have allsorts of ideas running through my head involving high power relays, zener diodes, buck/boost converters and water heating elements
If anyone has any ideas, suggestions, links to suitable products etc I'd be interested & very grateful to hear.