If it's 240V single phase center tapped between two legs of a 480V delta transformer, then one of the 240V legs *is* technically a neutral. What you have is two 240V legs between two of three 480V phases. That said, if the service from the utility is this type of 480/240V "split-phase," which presumably is exclusively to run pumps, then you're probably going to have a hard time coming up with a good solution, and the utility will probably not appreciate the phase imbalance that would be introduced. On the other hand, if the load is constant and greater than the solar production, they may appreciate it, provided you can find a suitable inverter, which I don't know of for this type of service.
If the service is actually 480V delta and they are providing 240V for the customer's convenience with a center tapped neutral, then obviously the 3-phase 480V is where you want to connect, but because you have 3 wires and not 4 this does not seem to be the case. See if the utility will supply the third hot 480V conductor and switch the service to 3-phase. They can leave the neutral in place to support the 240V loads. [image: Inline image 1] Jason Szumlanski Florida Solar Design Group On Fri, Apr 29, 2016 at 3:52 PM, Chris Mason <cometenergysyst...@gmail.com> wrote: > If it's delta there is no neutral. > On Apr 29, 2016 12:40, "jay" <jay.pe...@gmail.com> wrote: > >> HI Jerry and all, >> >> I’m sorry if I confused the issue. >> I haven’t seen this, I’m doing the research for a friend. >> It has been measured at numbers provided. 480 line to line, 240v line >> to neutral, 2 hots wires, not 3. >> >> The client has been told by 3 different installers that its impossible >> system to do. >> And as the experts here have provided, thats just not true. >> >> Thanks for the input. >> >> jay >> >> >> On Apr 28, 2016, at 6:58 PM, Jerry Shafer <jerrysgarag...@gmail.com> >> wrote: >> >> I cant say l have seen a single phase delta, open delta, use two of the >> three legs but not on pumps, can someone explain, what am l missing as the >> term delta is three points >> Jerry >> On Apr 28, 2016 3:50 PM, "Jay" <jay.pe...@gmail.com> wrote: >> >> Great inverter but this is single phase. >> Jay >> >> Sent from my iPhone >> >> On Apr 28, 2016, at 3:10 PM, jerrysgarage01 <jerrysgarag...@gmail.com> >> wrote: >> >> What about an SMA Tri Power inverter >> Jerry >> >> >> Sent via the Samsung Galaxy S™ III, an AT&T 4G LTE smartphone >> >> >> -------- Original message -------- >> From: Chris Mason >> Date:04/28/2016 8:52 AM (GMT-10:00) >> To: RE-wrenches >> Subject: Re: [RE-wrenches] 480 single phase delta >> >> You will use a 240:480v step up transformer >> On Apr 28, 2016 14:17, "jay" <jay.pe...@gmail.com> wrote: >> >>> HI All, >>> >>> I have a question from a person wanting to do a intertie on a commercial >>> water pumping site with >>> >>> 480v single phase delta configuration. >>> >>> PV will be in the 10kw range. >>> >>> Anybody have an idea of what equipment will work for this? 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