Disconnect Question [RE-wrenches]

[William Miller]

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Allan:

This is one case where the SW inverter would be superior.  You could feed 
the AC In 2 with grid power and still have a single throw disconnect on the 
AC In 1.  This may be a signal to Outback to consider building in two AC 
inputs.

This begs the question:  Why would the utility want to lock out a system 
unless there was an outage?

I did not intend to make this an Outback bash, but now that I think of it, 
I have a complaint:  switching off the sell mode in the Outback is no easy 
operation.  With the SW, just switch to the Float mode.  With the Outback, 
you have to raise the sell voltage, not a very positive switch.  Chris, 
here are two suggestions I think are very valid.




William Miller




>Wrenches,
>New Mexico has a requirement that if the utility locks out a grid-tied
>system, the utility power must still be able to power the critical loads.
>It's a weird and unique complication. With batteryless systems, this has
>been of no consequence, as the also-required lockable visible-break
>disconnect is OK as is. But with a critical loads served by a backup system,
>a double-throw, lockable manual transfer switch is required.
>
>Who makes the lowest cost product that meets these requirements?
>1. 3R enclosure
>2. Fusibility, neutral buss, and center-off position are not necessary
>3. Double-pole OK, but 3-pole may be used if cheaper
>4. 60A AC capacity (50A would work, as it's Outback PS-1 equipment, but I
>think 60A is standard for most manufacturers); no DC rating required
>5. It must be "visible-break", so breakers can't be used, even though they'd
>be simpler and cheaper
>
>Thanks for the benefit of our collective experience, as usual.
>
>Allan at +E

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