I have been assured by enphase that my 215 and 220 lose so little I do not have
to worry, however I see them clip at 199 watts for more than 2 hours quite
frequently (maybe 3 hrs) the curve is rising on a clear day and it flat tops at
199 W particularly with snow, cold, on my seasonal tracker
And yes other systems will exceed DC rating under same conditions
From: Marco Mangelsdorf ma...@pvthawaii.com
To: RE-wrenches re-wrenches@lists.re-wrenches.org
Sent: Sat, January 15, 2011 2:58:45 PM
Subject: [RE-wrenches] Enphase and oversizing
To those of you installing Enphases.
Other than their 210 only working with Sanyo and SunPower modules, the vast
majority of other mods only work with the Enphase 190.
Question: what’s the max size module that you’re comfortable using with the
Enphase 190?
In there here parts I’m seeing competitors pairing the Enphase 190 with modules
in the 230+ watt range. Some are even pairing the 190 with the SolarWorld 245.
Talk about wasting the customer’s money….
This strikes me as a bad design that essentially has the homeowner throwing
away
some of his/her money on unused PV horsepower. Here in the tropics, where the
edge-of-cloud effect can be seen on a regular basis, I see DC nameplate AND
higher coming out on the AC side of my systems.
I’m wondering where others are on this question of oversizing.
Thanks,
marco
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