[RE-wrenches] Incompatible Module with Enphase Microinverters

[Nick Soleil]

Hi Jason,

There is a risk of damaging the microinverter if the input voltage goes over the "Max Input Voltage" as listed on the datasheet<https://support.enphase.com/s/article/Enphase-IQ-7-and-IQ-7plus-Microinverter-Data-Sheet>.  The max input voltage is 48Vdc for the IQ 7s and 60Vdc for the IQ 7+ microinverters.  You can reference the Enphase Module Compatibility Calculator<https://www4.enphase.com/en-in/support-module-compatibility-en> and see if that specific module is compatible in that specific location.

The largest risk of seeing a high voltage at the input terminal will occur on a cold day when the electricity is out or breaker is off.  If the utility power is present and in range, then the microinverter will likely be powered up and will pull the DC module voltage down to the Vmp.

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

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From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> on behalf of Jason Szumlanski <jason at floridasolardesigngroup.com>
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Subject: [RE-wrenches] Incompatible Module with Enphase Microinverters

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Does anyone know what happens when you put a 72-cell module on an IQ7 that is designed for 60-cell compatibility only?

I have "inherited" a site where my initial research appears to indicate they have 300W 72-cell modules on IQ7 microinverters. I might have bad information from what the original installer entered in Enlighten - that remains to be seen.

While they have a branch circuit down, the other branch circuit seems to be working completely normally. So I'm thinking they actually have 60-cell panels installed, but I am still curious what would happen if they were, in fact, 72-cell. Would they just fail to produce power when the Vmp exceeds the operating range? Or would they start up at all given that the Voc might be out of range?

Curious....

Jason Szumlanski
Florida Solar Design Group



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