This is fine; your PVI2500 is rated for 10.4A, while the SB3000 is
12.5A. You can put up to 24A rated current through your 30A fuses.
Though the disconnect isn't technically a service disconnect, I'd
recommend using a 60A rated (fused at 30A) disconnect per 230.79(D). You
would run a neutral to your combining panel and I'd recommend a "PV
SYSTEM ONLY; NO LOAD CIRCUITS TO BE ADDED" placard on that. Otherwise
that'll be an electrician's first choice when wiring up the new 40A hot
tub.
I think something like the Cutler-Hammer BR24L70RP panel may be a good
fit, and it would replace your fused disconnect. It only has space for
two 2P breakers (no main).
On 2012/4/19 12:29, Dave Palumbo wrote:
Wrenches,
We have an installation in place since 2008 working well with a
Solectria PVI 2500 feeding a supply side grid connection.
Homeowner wants us to double the system size now. I can buy a SB3000
inverter for $ 300 less than the Solectria PVI 2500 (with upcharge for
10 yr warranty) and I’m inclined to go with the Sunny Boy.
We would add an Inverter 240Vac combiner load center before our 30A
Fused Disconnect. I would think that it would be OK to combine the
240vac outputs of different inverter manufacturers and sell into the
grid but never having done this I wanted to run it by you folks. The SMA
phone tech didn’t seem to be the most experienced person and after I
spoke with him for a minute I had him saying that it should work fine.
But wanted to check with more experienced people.
One wrinkle is that the Solectria does not use a Neutral, but the Sunny
Boy does. Again, I don’t think that this will any problem.
David Palumbo
Independent Power LLC
462 Solar Way Drive
Hyde Park, VT 05655**
*/www.independentpowerllc.com /*
NABCEP Certified PV Installer
Vermont Solar Partner
24 Years Experience, (802) 888-7194
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