SW critical load considerations [RE-wrenches]

[Drake Chamberlin - Electrical Energy]

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Hi Marco,

This is a good question.  You could use the demand factors from Article 220 
of the NEC.  Also, see examples in Appendix D.

Drake

At 02:32 AM 06/22/2001 -1000, you wrote:
>Wrenches,
>
>Hearye, hearye to those of you who have installed grid-connected systems
>using battery-based Trace SW inverters (2512, 4024, 4048, 5548).  As you
>will remember, the maximum amount of constant current that the these
>inverters can handle is 60 amps AC.  When you relocate 120 VAC circuits from
>the existing breaker panel to the new critical load sub-panel, you install a
>60 amp breaker in the existing panel which is the AC disconnect for the
>inverter and new sub-panel, right?  And the max constant current that the SW
>can handle internally is also 60 amps, right?  So, my question to all of you
>is: what's your rule of thumb for how many amps worth of circuits (per SW
>inverter) you put in the critical load sub-panel?  Clearly, most would put
>in more than 60, right?  Consider the logic of main electrical service
>wiring coming into a house.  You have a  typical 100 amp main service
>disconnect breaker and yet on the breaker panel, you will find considerably
>more than 100 amps' worth of circuits on each hot pole of that two pole
>service bus bar.  Going back to the solar example, I typically will put
>90-120 amps worth of circuits per inverter into the new critical load
>sub-panel with the understanding that you want to be able to provide your
>customer with power in a number of places in the house BUT not max out the
>inverter output if the grid goes down nor go beyond the 60 amp max when the
>grid is on.  What do you all do in such situations?
>
>aloha from Hilo town,
>marco
>
>Marco Mangelsdorf, Ph.D.
>Marketing and Sales
>ProVision Technologies, Inc.
>69 Railroad Avenue, Suite A-7
>Hilo, Hawaii 96720 USA
>(808) 969-3281, fax 934-7462
>www.provisiontechnologies.com
>
>
>
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