Craig,
Just finished an installation that was sounds similar: grid connected
house with a 20-kW automatic generator backup. We decided against
installing grid interactive inverters on the load side of the transfer
switch. The site had a 400-amp disconnect switch located before the
automatic transfer switch because the transfer switch wasn't service
rated. Tap for the inverters is on the load side of the service
disconnect before the transfer switch so the grid interactive inverters
never see the generator output. There has to be a fused disconnect for
the inverters grouped with the service disconnect.
Kent Osterberg
Blue Mountain Solar
craig gerald buttke wrote:
installers,
so as to not reivent the wheel.
any experience with connecting a grid PV system on the load side of an
automatic transfer switch?? fronius ig plus or sma's either one.
the genset is a natural gas that modulates with load-- so it is a step
up from a menards portable type.
assuming the solar is over producing the home usage (its a 10 kW
system so it could very well), the genset is still holding a "grid"
albeit at idle, the inverter will not necesarily know what to do
except keep wanting to produce "current (amps)".
who has already tackled this??
further there is talk of a battery system possible. but the 7 kW
genset would be stronger than a stacked pair of out back inverters,
and or too much capacity for the FM charge controllers to go to the
battery.
comments?
Thanks,
Craig
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