balancing output from multiple controllers [RE-wrenches]

[William Miller]

Wrenches:

Two sub-headings come to mind on this topic:  Balancing charge controllers
and balancing SW inverters in sell mode.

Balancing systems with two SW inverters in sell mode is a nightmare and
should be addressed by Xantrex (we could add it to our long wish list, but
the whole concept of that wish list is now a joke, seeing how little good
it did and how much time we spent).

John, in regards to the Pulse charge controllers, were these relay
activated?  If so, how does one taper with these?

William Miller




At 03:47 PM 9/23/02 -0700, you wrote:
>Wrenches:
>
>The multiple controller problem was addressed in the Power Centers we
>built at Pulse (now Connect Energy).
>They used one master control board to control multiple sub-arrays in a
>closed loop fashion.
>The off-the-shelf PC 500 could do up to 240 Amps with 4 sub-arrays at
>12,24, or 48 Vdc and you had coordinated bulk / float / equalize.
>The largest custom unit we ever did was 400 Amps at 240 Vdc with 6 sub
>arrays.  That one was not quite off-the-shelf but it worked great.
>
>I am not sure if they are still building them but it might be worth a
>call.
>
>If you have any questions, or if I can be of any further assistance,
>please do not hesitate to contact me.
>
>Best Regards,
>
>John Berdner
>
>SMA America, Inc.
>20830 Red Dog Road
>Grass Valley, CA  95945
>530.273.4595 (voice)
>530.274.7271 (fax) 
>
>

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William Miller
Miller Power and Communications
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email: wrmiller at slonet.org
http://millerpowerandcomm.com
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