William,
I recently did a GT with PG&E where they allowed me to
backfeed 18KW into their 208 /single/ phase (L-L-N). So even though just
2 hots and a neutral were pulled unto this service panel, no doubt the
PG&E source (transformer across the street) had 3 phase available....yet
I was backfeeding just two of those 3 legs when my backfeed got back
over to their transformer. This is a PTO'ed, operating system. Years
ago I was told they only wanted to see 6KW max out of balance,
apparently it depends.
Jerry made a pretty good point about about biting the $20K
bullet now and get help from the ITC.
Bill
Feather River Solar Electric
Bill Battagin, Owner
4291 Nelson St.
Taylorsville, CA 95983
530.284.7849
CA Lic 874049
www.frenergy.net
On 1/16/2019 1:11 PM, Jerry Shafer wrote:
William, Wrenches,
can we assume the utility voltage is 120/208 of so Fronius has some
inverters that do that, if it is 277/480 then SMA can do that but
neither of them are less then 10k, Enphase does not have a 3 leg
inverter just 1/2,2/3/,3/1 leg balance but you can do that with most
any single phase inverter.
We have had several customers that got hit with Xformer upgrade
charges at time of PTO which is a real problem. I agree that is you go
solar that the bill would be close to zero now that would trigger the
20 k bill to your customer, better off paying it now and getting FTC
while you can.
Jerry
On Wed, Jan 16, 2019 at 12:30 PM William Miller
<[email protected] <mailto:[email protected]>> wrote:
Friends:
I am engaged in a rather complicated decision process regarding an
AG customer in PG&E territory. The customer spends a lot of money
pumping water and wishes to offset that cost with installation of
a grid-tied system. His two services are decrepit and have to be
upgraded. There was some question if he will be required to
upgrade from single phase to three phase given the size of his
motor loads. We received a waiver to allow us to continue with
single phase although I am not sure that is the right decision.
We were also informed that the $20,000 cost to upgrade the single
phase feeder to allow bigger services would be waived because of
the potential revenue PG&E would earn over time. There is a
review three years out and if the revenue meets projections based
on existing loads, the construction credit would remain. If,
however, after three years revenue decreased, the credit would be
rescinded, requiring the customer to fork over the 20 grand.
I was told that if we install solar and zero out the annual bill,
that reduction in billing would trigger the rescinding of the
credit. I want to check that the utility is interpreting this
correctly. Do any of you esteemed wrenches have any experience in
this area?
Another question: If we go three phase and I wish to use
inverters with two hot leads, I know they will work on three
phase, but the back-feed will be imbalanced. I know we are
allowed some amount of imbalance, but I am not sure how much.
Anyone know this answer?
I am searching for true three phase inverters in the less than
10kW range. This would require a connection to all three phases.
I believe Enphase can do this. Are there any other units you know of?
Thanks,
William
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