Now, how do I get my hands on one out here...

Interesting idea. However, these 12V brushless fans seem to be very finicky about power. Also, I only really want it to run when the turbine is producing a fair bit of power, say above 5A (which is why I was looking at temperature control). I don't want to waste what little charge I am getting in light winds.

The maximum I've seen out of the turbine is 34.95A according to my Doc Watson meter. On the same day, the bicycle computer registered a max RPM of 1170.

A more typical output is around 3-5A in the winds we've been having lately. The box has good heat sinks (it used to be a 40A 12V battery charger), so I'm really only looking to cool it when the turbine is really cranking. At anything below 5A output, I would probably just be wasting power by running the fan. I'm also using twice the rectifier capacity of what the alternator was originally supplied with. It originally had two single phase bridges using both inputs from one and a single input from the other. I have installed three of the same bridges and am using all inputs.

There is no regulator connected to the turbine. Output is wired direct to the batteries. I'm in the process of installing a Tristar 60 with a 600W 12V heating element in my hot water tank, but with the light winds we've been having lately (and the fridge running 24/7), It's been a long time since I've seen peak voltages over 14V. However, I also do have a second wind turbine ready to fly (with it's own rectifier box), so that should help a bit.

What it does is boost the voltage when the turbine is running below cutin.

Cutin of my turbine is at 300rpm. In other words, there is no output from the turbine at 300rpm. Once it passes that speed, it starts charging.

With the S4w booster, cutin is around 140rpm. Not much, but it IS charging. At 300rpm it is producing 1A. It breaks even at around 340 - 350A and 2A. In other words, at this speed there is no increase in output when the booster is connected.

So, what it does and was designed to do is to give some charge in light winds. It probably works best with a turbine like mine which spins very easily in light winds. My other turbine (which is not flying at the moment, but probably will be by tomorrow) takes a lot more wind to start spinning, but still produces around the same once the wind picks up. Since it doesn't do much spinning in light winds, the booster would probably not do much for this turbine.

The only disadvantage I have found to the booster so far is that it produces some RFI on my shortwave (ham) radio. I have to switch it off to copy light stations. (And remember to turn it on again after.) This will naturally be less of an issue for those who do not have ham radio or live in houses where the distance between the booster and antennas and radios can be greater.

You may say that 1A is not much, but an average 1A is still 24Ah per day that I would not be getting without the booster. That's enough to run my Stirling cycle fridge. :)

I can't remember ever seeing a travel trailer (or mobile home) on this island. I'll have to keep my eyes open for one. There probably isn't much market for them on an island the size of a postage stamp.

Anyway, I've found a snap switch now (see above), so I'm a happy camper.