Looks like your question is answered but something else to look out for-
this is pretty straight-forward for batteryless systems but for
battery-backup and a line-side tie, you're adding a big load to the
service conductors for battery charging and pass-through current to
critical loads. If you're tying in your battery-backup system as a load
side connection, if you have a high house load and a high
battery-charging load then the main breaker trips to protect those
service conductors. However, by bypassing the main here you could be
pulling enough power in to overload them and cause a meter fault.
But at least when the meter fails you have your important stuff on
battery-backup...
Dave Palumbo wrote:
Wrenches,
I am tasked with reviewing an installation by a licensed electrician in
Vermont and would like help with the following:
Grid-tied PV system with battery back-up. AC point of connection is a
supply side tap (done on customer side of utility meter ) then traveling
5 feet of #2 THHWN in 1β EMT to the 60 Amp 240vac Lockable Utility
Disconnect (unfused) and continuing 15 feet #2 THHWN 1β EMT to Xantrex
XW 60 Amp breaker.
I had said that the 60amp 240vac lockable disconnect needed to be fused,
and received the following reply from the installing electrician.//
/ /
/<< βThe Xantrex XW Power Distribution Panel contains the required over
current protection (60 amp/
/double pole circuit breaker) negating the need for a redundant fuse at
the Utility Disconnect switch.β >>/
/ /
I am on a short trip in Florida and away from my code books. Can someone
provide guidance and code reference please? I am concerned about the 20
foot distance of the un-protected circuit from the supply side tap and
also the interrupt rating of the 60 Amp breaker in the Xantrex
distribution panel.
David Palumbo
Independent Power LLC
Offices in Lamoille and the Champlain Valley
802.888.7194
www.independentpowerllc.com
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