We have an Aerogen 6 wind generator
on our boat
, fitted some time in the late 80s. I recently replaced the bearings, repainted and rebalanced the blades and now it is like new again.
Now the manual for the Aerogen 6 states that it is not suited to unattended operation in winds over 45 knots, presumably because it would be damaged by over revving. As a result I have always left it tied off when we are not using the boat
. ( I should mention that the batteries
are managed by a reasonably smart solar regulator
so I don't leave the wind generator
connected to the battery
when we are not using the boat. The regulator
gets confused by the solar
regulator and ends up switching the dump load on and off constantly.)
But last week it suddenly struck me that the chance of winds of 45 knots hitting our boat in the pen are practically zero, and if strong winds are forecast
I tend to go down and check the lines etc anyway. Tying the Aerogen off is fiddle and a bit risky as it is up very high and you are technically outside the line of the boat when you carry out the procedure. Also, leaving it tied off for long periods apparently causes the bearings to get flat spots and develop a knock, which we were experiencing before I replaced the bearings.
So I tried electrical
braking by shorting the outputs and the effect was startling. In 25 knots apparent wind
speed it reduced to something under 70 rpm
. We rarely see more than 10 knots when in the pen. Current
being induced in the circuit was about 8 amps at that 25 knot wind
speed. Voltage was, of course, too low to measure with a total short and Awg 8 cables
So, all this leads to the following question: as far as anyone knows is there any downside to this arrangement in terms of potential damage to the Aerogen? I mean at an electrical
level does this sort of thing significantly reduce the life of the magnets in the rotor?
(I just edited this post as I remembered there are no brushes
in the generator
housing so I don't need to worry about increased brush wear)
Any gotchas I should consider?
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