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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