Hi all, All this talk about Enphase recently and I have a design question that I am having trouble getting a straightforward answer to. The IQ system controller can take up to 64A of PV AC output on the DER port (coming from the IQ combiner for example). When there is more solar on site, the question is what do you need to do with the rest of the solar.
They have a system planning guide that talks about some of this and you can find it here: https://enphase.com/download/planning-enphase-energy-system-tech-brief Page 59 bullet point 6 says that with IQ8 micros, the excess PV must be split into a grid-tied system. I recently did this, got a separate IQ gateway, and a power line filter, and the system continues to have cross talk issues between the two gateways, and the microinverters will just not report properly no matter how many times tech support re-provisions the devices and prevents each gateway from looking for more devices. Then I noticed that with M series micros (page 62 bullet point 9) it says that microinverters exceeding 64A can be added to the main panel. In this scenario, there will be more than 64A of solar flowing through the IQ system controller, even though the DER port is limited to 64A. I would like to do something similar to this for my system with crosstalk issues and get rid of the second IQ Gateway. I asked tech support why there was a difference in the planning document for IQ8 and for M series and whether I could add the extra IQ8 into the backed up subpanel (This is a Sunlight backup system). They did not give me a fully complete answer, but they did say this, "You can add the panels up to 64A into the system controller and exceeding PV can be connected to the backup subpanel." I fear that this was a level 1 tech and that they may not have completely understood the situation. This is the answer that I wanted, but I am not sure I trust it yet. Has anyone here tried something similar to this? Thanks! -Dave -- [image: Logo] <https://www.sungineersolar.com/> Dave Tedeyan, P.E. Owner | Sungineer Solar p: he | him | his a: 1653 Slaterville Rd. | Ithaca, NY 14850 w: www.sungineersolar.com <http://www.sungineersolar.com/> c: (607) 270-0370
_______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org
