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Forum Index : Windmills : 3phase 14awg VS 3phase 18awg PMA’s

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faroun
Regular Member

Joined: 18/09/2008
Location:
Posts: 62

Posted: 08:53pm 31 Dec 2010

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PMA update

PMA 1: to be used for a 24vdc battery bank
24magnets: 1"x.5"x.5" N48, 2 discs @ 11.5" dia.
18 coils: 14AWG, 70turns, 3 phase, star configuration.
@21rpm=>1.27amps shortted
@36rpm=>3.10amps shortted
@123rpm=>14.1vdc
@212rpm=>27.0vdc
@300rpm=>39.0vdc

PMA 2: to be used for a 48vdc battery bank
24magnets: 1"x.5"x.5" N48, 2 discs @ 10.5" dia.
18 coils: 18AWG, 125turns, 3 phase, star configuration.
@13rpm=>.65amps shortted
@104rpm=>27.0vdc
@148rpm=>39.0vdc
@190rpm=>50.0vdc
@285rpm=>76.0vdc

i am happy with the results.
i have 2 pma's now to test/mount on my Column-R.
so you know, i am leaning towards the PMA1
regards

sam

Many Ideas One Brain.
http://www.wrapwind.com

VK4AYQ
Guru

Joined: 02/12/2009
Location: Australia
Posts: 2539

Posted: 11:28pm 31 Dec 2010

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Hi Sam

Can you do a load test connected to a battery bank as your figures would indicate that it is open circuit voltage, and the shorted amps would be different when put into a load such as a battery.

If you could enter into a XL spread sheet the results can then be graphed.

I found that driving the alternator in the lathe to get figures is a starting point only, and the end results when wind driven are less than half due to the variation in energy over a small speed range. In high winds the alternator can be easily overdriven and saturate, don't you love windmills.

Keep up the good work .

All the best

Bob

Foolin Around

faroun
Regular Member

Joined: 18/09/2008
Location:
Posts: 62

Posted: 12:10am 01 Jan 2011

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ok, i will connect the charge controller and do a 12, 24, 48 Battery Load test next year.

thanks for the support and intrest.

happy new year

sam

Many Ideas One Brain.
http://www.wrapwind.com

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