## [a-w-h] Re: 3 phase currents

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• Mike ... not really. I cannot see the logic of this.. 3 ac dump loads rated at a lower voltage, with 1.5kW rating will work fine. The rms voltage between any
Message 1 of 4 , May 1, 1999
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Mike

>So, Hugh, if what you are saying is true, and I wish to
>dump on the 240VAC side of our transformers (which you
>have recommended doing), this means that instead of a
>4500 watt machine (for battery charging), that I MUST
>provide a 10600 watt AC dump load (max output
>is supposed to be 5300 watts), minimum, correct?

not really. I cannot see the logic of this..

3 ac dump loads rated at a lower voltage, with 1.5kW rating will work fine.
The rms voltage between any 2 ac wires will be about 40 volts.

Hugh

www.scoraig.com
visiting eigg
Scotland

+44 1854 633 286 (233fax)
(UK 01854 633 286)

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• woops I didn t read the message carefully enough (too late last night). Mike was talking about his 240 volt AC wires (and not the previous 48 volt system). ...
Message 2 of 4 , May 1, 1999
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woops I didn't read the message carefully enough (too late last night).
Mike was talking about his 240 volt AC wires (and not the previous 48 volt
system).

>So, Hugh, if what you are saying is true, and I wish to
>dump on the 240VAC side of our transformers (which you
>have recommended doing), this means that instead of a
>4500 watt machine (for battery charging), that I MUST
>provide a 10600 watt AC dump load (max output
>is supposed to be 5300 watts), minimum, correct?

3 loads at 1.5kW each is what you need, you may need to check the rms
voltage between the wires when the batteries are at dumping voltage. If the
actual voltage between the ac wires is 240 then loads at 1.5kW each rated
for 240 volts will do the job. If the voltage turns out to be lower then
you may need loads with a higher nominal power rating.

the current in each wire from the wind machine will be 73% higher than the
current to each load because the loads will be connected delta. If you
prefer you can connect the loads 'wye' or 'star' in which case each load
will get the full current from one wire but will operate at lower voltage.
In any case the power the loads consume will be equal to the power the
windmill produces .

If in doubt, just try it and see, but do not run loads at voltages much
above the rated voltage or they may become a hazard.

Hugh

www.scoraig.com

Scotland

+44 1854 633 286 (233fax)
(UK 01854 633 286)

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• Mike ... not really. I cannot see the logic of this.. 3 ac dump loads rated at a lower voltage, with 1.5kW rating will work fine. The rms voltage between any
Message 3 of 4 , May 3, 1999
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Mike

>So, Hugh, if what you are saying is true, and I wish to
>dump on the 240VAC side of our transformers (which you
>have recommended doing), this means that instead of a
>4500 watt machine (for battery charging), that I MUST
>provide a 10600 watt AC dump load (max output
>is supposed to be 5300 watts), minimum, correct?

not really. I cannot see the logic of this..

3 ac dump loads rated at a lower voltage, with 1.5kW rating will work fine.
The rms voltage between any 2 ac wires will be about 40 volts.

Hugh

www.scoraig.com
visiting eigg
Scotland

+44 1854 633 286 (233fax)
(UK 01854 633 286)

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