Thanks, Nick. That is definitely an advantage that I didn't consider I suppose. You're talking about the AC rating limit (microinverter combined output). I think it would be rare around here because small battery systems are not appropriate for central air conditioning backup. Most of the systems we install are 40kWh, and that's cutting it very close for most homes.
If my math is right, that allows about 23kW of PV (AC) with the IQ7 series before you exceed the limit. We did one maxed out system with 66 x 415W panels with IQ7A. We would be hard pressed to find a scenario where more PV is necessary while 40kWh of battery capacity is sufficient. While on the subject, it is important to note that only 80A of PV OCPD can land on the smart controller busbar. In the application above, that meant 44 microinverters. The other 22 had to be feeder tapped on the load side of the smart controller. That is not exactly an elegant solution. Totally irrelevant to this conversation, but interesting to note. I'm finding a lot of competitors in my market offering the IQ8 series without sunlight backup and I have been scratching my head as to why. I have been explaining to clients that it is not necessary to incur the extra expense, but that is a hard sell when someone else is telling them they are getting the latest and greatest. I don't want to roll over and join them, but I also don't want to miss an important benefit that I haven't considered. Jason On Tue, Jul 12, 2022, 7:03 PM Nick Soleil via RE-wrenches < [email protected]> wrote: > That is correct, Jay. You only need the rapid shutdown switch if you have > IQ 8s and an IQ System Controller. > > One of the big advantages of the IQ 8 over IQ 7 when paired with storage > is that the 1.5 PV to storage ratio does not apply, so you can install > larger PV systems with smaller battery systems. > > Cordially, > > Nick Soleil > > Enphase Energy Senior Product Manager > > (707) 763-4784 x7267 // office > > (707) 321-2937 // cell > > *Powering What’s Next*™* | *The Enphase Energy Management System > <https://enphase.com/en-us/products-and-services/envoy> > > NABCEP Certified Solar PV Installer #03262011-300 > > California C10 Licensed Electrician #986315 > > ------------------------------ > *From:* RE-wrenches <[email protected]> on behalf > of Jay via RE-wrenches <[email protected]> > *Sent:* Tuesday, July 12, 2022 3:54 PM > *To:* RE-wrenches <[email protected]> > *Cc:* Jay <[email protected]> > *Subject:* Re: [RE-wrenches] Enphase IQ7 versus IQ8 > > *EXTERNAL EMAIL* - *Use caution when responding, clicking, and/or > downloading attachments.* > > > > > Hi Jason > > And if you don’t have the smart controller/battery system then you do not > need this proprietary rapid shut down switch correct? > > Jay > > > > On Jul 12, 2022, at 3:25 PM, Jason Szumlanski via RE-wrenches < > [email protected]> wrote: > > > Yes, they require a proprietary rapid shutdown switch that connects to the > smart controller. This would be in addition to a visible load break > disconnect if the utility requires it. You cannot fulfill both requirements > with one switch, and it requires a line voltage circuit be run from the > smart controller to the rapid shutdown switch. > > > > On Tue, Jul 12, 2022, 5:15 PM Mark Frye via RE-wrenches < > [email protected]> wrote: > > Do you need the additional switch if you use the Enphase battery? > > > > *From:* RE-wrenches <[email protected]> *On > Behalf Of *Jason Szumlanski via RE-wrenches > *Sent:* Tuesday, July 12, 2022 11:38 AM > *To:* RE-wrenches <[email protected]> > *Cc:* Jason Szumlanski <[email protected]> > *Subject:* [RE-wrenches] Enphase IQ7 versus IQ8 > > > > I am trying to figure out why it is a good idea we use the IQ8 in anything > other than a solar only backup scenario. If there are Enphase batteries > involved, wouldn't the IQ7 do the same job on the roof? In a straight grid > tied scenario, again the IQ7 would do the exact same thing. You would not > have an upgrade path to solar only backup, of course. > > > > I'm just having a hard time understanding the value proposition of the IQ8 > in most of the situations I encounter. They cost significantly more, and > you need an additional rapid shutdown switch when using batteries that can > be quite a pain in some scenarios. > > > > Am I missing something about the switching speed, energy harvest > capability, or the way they interact with batteries that makes them better? > > > > P.S. I am aware of the very small power output differences by model number > and I am referring exclusively to 240 volt applications. 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