alternators with above 90% efficiency are very large. For example at a hydro plant those alternators may be 98% efficient.
The small alternators are not even close. Delco is bragging up a new high efficiency machine with an astounding 70% efficiency.
So that tells you the one you already have is in the 50-60s percent efficiency at best. Sucks.
Kirk
Public trust in the mainstream media is at an all-time low, says a new Gallup poll. It's not surprising, of course, since most people have now come to realize the mainstream media is nothing more than a corporate mouthpiece that pretends to be engaged in reporting the news:
http://www.gallup.com/poll/149624/Majority-Continue-Distrust-Media-Perceive-Bias.aspx
From: Femm <femmpaws@yahoo.com>
To: electricboats@yahoogroups.com
Sent: Sunday, October 16, 2011 8:44 PM
Subject: Re: [Electric Boats] Well, I am pleased to meet you, won't you guess my name.
To: electricboats@yahoogroups.com
Sent: Sunday, October 16, 2011 8:44 PM
Subject: Re: [Electric Boats] Well, I am pleased to meet you, won't you guess my name.
| Okay from the sounds of things you like to tinker in your shop.... In your post you imply how easy it is to turn an alternator over by hand. SO you may be getting what a few hundred RPM, this is still below the cut-in RPM needed to start making power. Did you have the Rotor excited while doing this? By hand you can spin a crank at about 120 RPM, cut in RPM on most auto alternators is around 2000 to 2500 RPM so to get it into a reasonable charge range you will need around 3600 RPM. SO make a set-up that has a 30 to 1 step up ratio and see how easy you can turn that crank with the rotor excited. Just so you know when I was in the US Army I had the fun of using one of the 24 volt hand crank field genorators to charge our field radios. I think they were about 200 watts. --- On Sun, 10/16/11, Lochadio Who <lochadio@yahoo.com> wrote:
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