Terry K wrote in news:1181091370.196386.319280
@k79g2000hse.googlegroups.com:

See http://www.otherpower.com/ for ideas about building serious output
generators from scrap, driven by a prop dragged by a steel cable
instead of a windmill. A person could probably get plenty of wind,
sail and water power if you don't mind slowing down some.

Terry K


Someone should build a small wind alternator from the Otherpower
technology. Otherpower's alternators would make a GREAT shaft alternator
with no belt, just a ring of coils around the magnets spinning on the
shaft....

Larry
--
If electricity comes from electrons, does morality come from morons?

On 5 Jun, 08:45, "Meindert Sprang"
wrote:
"nimbusgb" wrote in message

oups.com...

Amps per day is a nonsense and meanigless unit and indicates a
complete misunderstanding of the principles involved.

Indeed.

To make sense you need to convert to amp/hours or watt hours.

Now you're making the same mistake: amps per day or amp/hours.... It is amps
* hours.

Meindert

Semantics Meindert

Amp hours is a recognised unit I was not implying 'per' with the
mistyped /

Ian

Your two generator puts out 6 amps ALL THE TIME. The number of days
of the voyage, the number of hours in a day aren't interesting.

AMPS*VOLTS = WATTS
WATTS * TIME = WATT HOURS (or minutes, or days, or seconds, or fortnights)

That's what's interesting.

Terry K's calculations
are right on. I have a master's degree in Electrical Engineering. This stuff is on
PAGE TWELVE of my first electronics text. It's that basic. We hit it
on probably the second day of the first electronics class.

"Hanz" wrote in message ...


Terry K wrote:
A technical subject requires technically correct language. One amp for
one hour is one amp-hour. 167 amp days is a convertible unit, but not
a conventional one. To correctly express amp-hours implies watt-hours,
but amp days implies a basic misunderstanding or mis-expression of a
conventional arithmetic term, since techs use amp-hours. 167 amps at
nominal 12 volts for a day is 48,096 watt-hours, a big wack of power,
unrealistic given the circumstances. 6 amps all day is 24 hours times
6 amps is 144 amp-hours. At 12 volts, that's 1728 watt-hours, or about
as much as a fully employed electric kettle needs, all hour, every
hour.

So, you could charge the battery all day, if it's big enough, and then
boil kettles full of water to boiling and discard the boiled water,
not counting invertor losses, for about half an hour, maybe 6 kettles
full. Overall, you only get back about half of what you put into a
battery.
Most of the power doesn't go into the batteries. It used to run the freezer/frig, auto pilot and nav equipment. The left over
power goes into the batteries.


I can measure output of tow generator and also input/output of the batteries.

The tow generator output 6 amp each hour for 28 days (from usa to europe).

We loss about 1/4 knots.

Hanz




Terry K