[RE-wrenches] Paralleling Multiple Inverter

[Mark Frye]

William,

The SMA6000 @ 240V has an AC output rating of 25A. 4 times 25 times 1.25
equals 125 A. If the solar accumulation panel is a dedicated load center,
then the load center, feeder and feeder breaker need only be rated to 125 A.
If the dedicated load center is located in the same building as the service,
then the dedicated load center can be main lug without main breaker. If the
dedicated load center is located on a buidling remote from the the service,
then it will need a main breaker rated at 125A.

 
Mark Frye
Berkeley Solar Electric Systems
303 Redbud Way
Nevada City,  CA 95959
(530) 401-8024
www.berkeleysolar.com 

-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of William
Miller
Sent: Sunday, January 22, 2012 10:20 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Paralleling Multiple Inverter

Rich:

Here is the first consideration you might want to make:  You state a value
of 100 Amps for this system, which I assume is the maximum AC output at 240
VAC (25 Amps) times four inverters.  The value of 25 amps per inverter is
irrelevant to your design, however.  You must take the 25 amps times 1.25
(for continuous duty) which means your required breaker is 40 amps (unless
you can find 35 amps breakers).  40 Amps is the relevant value.  40 times 4
equals 160 amps.  Therefore, for purposes of 690.64(B) calculations, you
have a 160 amp system.

Others on this list will no doubt provide advise on how to deal with that
160 amps.

William Miller