[RE-wrenches] 3.7kW grid tie

[Glenn Burt]

We are opting more and more for supply side connections in these situations
(assuming convincing the customer that an upgrade to a 200A service/panel is
not an option). We have yet to run into an AHJ that cannot be made to see
this is a good option and we use Ilsco Kup-L-Taps to pierce the main
conductors inside the load center, prior to their landing on the main
breaker.

 

-Glenn Burt

Alteris Renewables, Inc.

 

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Dave Palumbo
Sent: Sunday, October 31, 2010 2:35 PM
To: 'RE-wrenches'
Subject: Re: [RE-wrenches] 3.7kW grid tie

 

AC Point of Connection could be to a backfed 20A DP breaker in the existing
GE TM3210CCU load center (100A MB with 100A busbar) if the SMA SB3800
inverter was still available. But a SB4000 requires a 25A breaker which
violates the 120% rule with the existing panel.

Comments on the options below. 

 

#1) Go with another 240v grid tie inverter in the 3800W range, so we can use
a 20 Amp breaker. I see PV Powered and Kaco have 3500's listed. Any 3.7, or
3.8kW inverters?

 

#2) Is it possible to either, change out the Main Breaker in the above GE
load center to a lower amperage MB, or add a Plug In Breaker. There is a GE
"feeder type" breaker # THQL2190 (90 A DP). Could we use this as the main
breaker for the load center above? It is listed as a 10KAIC breaker.

 

#3) Swap out existing 32 space load center and replace with 150AML panel
with 100A MB kit.

 

Thanks,

Dave Palumbo

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