HI William;
I think you might have a problem. Looking at Enphase's ratings, the
M190 has an output rating of 800mA, while the M250 has an output rating
of 1.0 A. 10 M250s = 10 amps, 9 M190s = 7.2 amps
17.2 amps exceeds 80% of your 20 amp breaker.
I know this won't actually happen, but my understanding is that 690.8
(A)(3) dictated how to figure this, and 690.8(B)(1) dictates the 80% of
breaker rating. So I think code wise, you're out of luck, unless you
have a 100% duty rated breaker and load center.
My thinking is that most inspectors would give you a pass; especially
when you show them the actual current flowing with the smaller modules.
Can you put more modules per inverter, or otherwise drop a couple of
inverters?
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760
On 10/9/2013 4:06 PM, William Miller wrote:
Friends:
At the risk of asking a question that may have been asked and answered
here in the past, I wish to pose a question about Point of Connection.
Rather than outline the situation here I put it all on a web page. If
any of you have a moment to review this, I would be most appreciative.
http://www.millersolar.com/MillerSolar/case_studies/POC/_POC_Question.html
Thanks in advance,
William Miller
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