[RE-wrenches] Enphase IQ7 versus IQ8

Tue Jul 12 19:03:10 EDT 2022

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 <re-wrenches-bounces at lists.re-wrenches.org> on behalf of Jay via RE-wrenches <re-wrenches at lists.re-wrenches.org>
Sent: Tuesday, July 12, 2022 3:54 PM
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
Cc: Jay <jay.peltz at gmail.com>
Subject: Re: [RE-wrenches] Enphase IQ7 versus IQ8

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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 <re-wrenches at lists.re-wrenches.org> 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 <re-wrenches at lists.re-wrenches.org<mailto:re-wrenches at lists.re-wrenches.org>> wrote:

Do you need the additional switch if you use the Enphase battery?

From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org<mailto:re-wrenches-bounces at lists.re-wrenches.org>> On Behalf Of Jason Szumlanski via RE-wrenches
Sent: Tuesday, July 12, 2022 11:38 AM
To: RE-wrenches <re-wrenches at lists.re-wrenches.org<mailto:re-wrenches at lists.re-wrenches.org>>
Cc: Jason Szumlanski <jason at floridasolardesigngroup.com<mailto:jason at floridasolardesigngroup.com>>
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. I understand the 208 volt advantages of the IQ8.

Jason Szumlanski

Florida Solar Design Group

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