Feeder sizing [RE-wrenches]

[Keith Cronin]

Hi folks

 

We are working on a project with 7- SMA 7000's @ 208V.

 

There spec sheets state 34 amps @ 208V. So, 34 amps x 1.25 = 42.5 amps (50
amp CB).

 

Since this is a 3 phase service, 42.5 x 7 = 297.5/ 1.73 = 171 amps. So, this
panel that will house the 7- 2P50's should be 200 amp rated?

 

I spoke to our resident guru, Bill Brooks, and he has a similar view of
things. Bill said for the sake of simplicity, take 6 inverters x 42.5 =
255/1.73 = 147 amps and add in the additional inverter, due to the imbalance
to come up with the feeder size.

 

Is there anyone who sees it the same or different?

 

Thanks

 

 

Keith Cronin

President

Island Energy Solutions Inc.

270 Kuulei Rd. Suite 106

Kailua, HI 96734

Electrical Lic C-25221

808-262-3268 Tel

808-263-0338 Fax

www.islandenergy.net 

 <mailto:kcronin at islandenergy.net> kcronin at islandenergy.net

 

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