[RE-wrenches] 3.7kW grid tie

[William Miller]

Dave:

All options satisfy the requirement.  Option 2 requires some research to 
see if a) a smaller amperage main is available or b) your AHJ will allow a 
plug on to be used as a main.  Some interpretations indicate a hold-down is 
the most that could be required for sub-option b).

William Miller



At 11:35 AM 10/31/2010, you wrote:
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>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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