Mike-
The power available from the wind is proportional to the cube of the wind speed.
Here’s a rough estimate for you then:
| Wind Spd | Pwr (watt) | Curr (amp) |
| 28mph+ | 400 | 8.3 |
| 26.8 | 350 | 7.3 |
| 25.4 | 300 | 6.3 |
| 23.9 | 250 | 5.2 |
| 22.2 | 200 | 4.2 |
| 20.2 | 150 | 3.1 |
| 17.6 | 100 | 2.1 |
| 14.0 | 50 | 1.0 |
| 11.1 | 25 | 0.5 |
| 8.2 | 10 | 0.2 |
It’s interesting to me that one of the big sell points as I recall for the AIR-X vs the AIR403 was that it would put out power at a slower wind speed.
The table above seems to indicate that there’s not really much use in deploying the windmill under 14mph, so it’s kind of funny that they’d talk about delivering power at 7mph. I recall that when I had my AIR403 on my boat there was one day when I was being blown upstream with a nice following wind, perhaps 12-15mph…looking at my Link10 Emeter, the current delivered to my 36v pack from the wind generator only ever reached between 0.5 and 1.5amps---i.e. only delivered about 50watts max…OTOH, it was free with the added benefit of getting some extra push from behind.
-Myles
From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com] On Behalf Of Mike
Sent: Monday, October 04, 2010 9:56 AM
To: ELECTRIC BOATS
Subject: [Electric Boats] 48 volt wind Generator current vs wind speed
| I just had a frustrating call to Southwest Wind Power technical support. Since I am laying at anchor waiting for a weather window in windy nasty conditions. I thought I would try and get some numbers regarding current vs wind speed for my 48 volt Marine AirX wind generator. Apparently Southwest Wind Power does not have these numbers. The rep did say that the generator would max out at 8.33 amps in 28 MPH winds. OK. But, I was looking for the approximate wind speed numbers for 1,2,3,4 and 5 amps. Am I asking too much in trying to cross reference the current readings on my ammeter to the approximate wind speed? Capt. Mike |
No comments:
Post a Comment