[RE-wrenches] Enphase and oversizing

[Darryl Thayer]

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 <marco at pvthawaii.com>
To: RE-wrenches <re-wrenches at 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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