Mark,
It was a 20-kW generator. I don't remember if it was a 100-amp or
200-amp ATS - it wasn't relevant due to the point of connection. Since
the ATS was not service rated, a service-rated disconnect had to
proceed it. That was to great advantage: 1) while connecting the PV
system to the utility side of the ATS, a service side tap wasn't
required. 2) The service disconnect switch had double lugs (not on my
sketch) so there weren't multiple conductor taps. While I only showed
one, this system actually had two non-essential panels: one for the
house and one for the barn.
Kent Osterberg
Blue Mountain Solar
Mark Frye wrote:
Ken,
In the situation you show in
your drawing, what was the rating of the transfer switch?
Mark Frye
Berkeley Solar
Electric Systems
303 Redbud Way
Nevada City, CA 95959
(530) 401-8024
www.berkeleysolar.com
Larry,
Situations vary so much that this might not be very useful. But here
you go. The attached sketch shows how we recently connected a customer
that had a backup generator and transfer switch that wasn't service
rated. There were nice gutters existing from the original install so
accessing points to tap conductors wasn't difficult. We could have
connected the inverters to the non-backed upped loads panel instead,
but the utility requires an accessible disconnect by the meter so it
was more convenient to just get into the gutter.
Kent Osterberg
Blue Mountain Solar
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