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-------- Forwarded Message --------
Subject: Re: FE1012U or FE1024U
Date: Fri, 7 Dec 2007 11:23:28 +0000
From: James Wright james @futurenergy.co.uk
To: Roger Lovejoy
CC: Sandra Shirley sandra @futurenergy.co.uk
What you are saying is correct but we have never tested this and therefore have no data. One thing to bear in mind however is that running higher voltage PMG on a lower voltage will reduce the available output power. The PMG's are available separately in 12, 24 and 48 Volt versions. Unfortunately the studs cannot be removed without voiding the warranty on the PMG.
I don't know if you have already seen this on our FAQ's page :-
Q: Would your Permanent Magnet Generators be suitable for a bicycle power generator? At a cadence of 100 and a gearing ratio of 52:11 I can generate about 473 RPMs but I think I can only sustain about 200 watts for a reasonable period of time. I'm looking to put in a solar and wind power plant with an additional bicycle charger, to run lighting and small appliances. This type of generator seems ideally suited but I'm wondering if you have a smaller version?
A: In reply to the question, the answer is yes. The potential buyer hasn't indicated what voltage of batteries he intends to use the generators to charge. If it's 24V then he would only require a 52:20 ratio to get the 200W output or so he desires. It would be easy to change the ratio to suit the desired output power requirements. It's not practical to expect to use a 'person' powered generator to produce any more than 100W or so. Even a pro' cyclist could only produce 400W peak power for a short burst, so he is being practical in his calculations. Any of the 4 PMG's would be an ideal generator for this type of application, as it has a large 'flywheel' effect when in use, which would feel smoother than a smaller generator, which may be very difficult to obtain.
Hope this is of use.
On 7 Dec 2007, at 00:23, Roger Lovejoy wrote:
I can't quite remember the lady I spoke to yesterday **** Shirley, she gave me your email address.
I am thinking of using a 24 volt version to charge a 12v system a) as I thought it may produce 12v at a lower rev/min than the 12v as I would like to run it from a pedal/cycle system.
1 pedal a second with 4:1 gearing so 240 revs/ min.
Plus the 24 does seem to produce more power at high speeds, how's that?
Do you have data on the voltage produced for the models rather than the cut in speeds.
I notice you sell the PMG separately but don't say which or if you sell 12 and 24 versions etc.
and finally as I want to fit a 12 tooth cog.gear, is there a simple way of removing the 5 studs, rather than it the cog outside the studs which will increase the bending effect on the axle.
FE1012U 12V Turbine Spec + Power Curve
FE1024U 24V Turbine Spec + Power Curve