[RE-wrenches] Module - microinverter compatibility question

[Nick Soleil]

The start-up voltage is triggered by Voc, not 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

________________________________
From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> on behalf of Maverick Brown via RE-wrenches <re-wrenches at lists.re-wrenches.org>
Sent: Wednesday, April 13, 2022 6:19 PM
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
Cc: Maverick Brown <maverick at mavericksolar.com>
Subject: Re: [RE-wrenches] Module - microinverter compatibility question

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I would say it’s likely okay, but to speak in the vernacular, “watch out sucka”.

Vmp will be lower due to temperature coefficient, dirt on the panels and degradation over time.  But, the inverter likely wakes up above the minimum Vmp as Voc has the voltage but the inverter can track below minimum Vmp after it wakes up and starts tracking. How far below official Vmp can it track? 18-58 is the tracking range. Inverter technical specs:

https://www4.enphase.com/sites/default/files/IQ7A-DS-EN-US.pdf

I saw an inverter comparison document but could only find this AU version just now.

https://www4.enphase.com/sites/default/files/downloads/support/IQ7A_Vs_IQ7plus_in_Australia.pdf



Maverick Brown
Off-Grid Solar Commander since 2006
Maverick Solar Enterprises, Inc.
 • Solar Commander Remote Power
 • SunFlow Systems Cathodic Protection
maverick at mavericksolar.com
512-460-9825


On Apr 13, 2022, at 3:57 PM, Drake Chamberlin via RE-wrenches <re-wrenches at lists.re-wrenches.org> wrote:

I'm concerned that a microinverter - module pair that has been specified by a supplier may not work. The maximum power voltage is very close to the minimum starting voltage. The Voc is adequately high.

An Aptos DNA-120-MF26-365W is paired with an Enphase IQ 7A

•    Minimum start voltage of the inverter is 33 V
•    Vmmp of the module is 33.96 V
•    Voc of the module is 40.7 V

Is the 33 V starting voltage going to be a problem with a module STC Max power voltage of 33.96 V? Is it the Voc that determines the starting of the inverter or the Vmmp?

Thanks,

Drake

Drake Chamberlin
Athens Electric LLC
Ohio Electrical Contractor’s License 44810
CO Master Electrician’s License 4526
NABCEP Certified PV Installation Professional


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