I just attended a training class in Philly last week by Enphase technical staff and my notes say they suggest up to 15 micro-inverters @ 190 watts each per string with no problem. They also are now shipping their dual module micro-inverter which should help with this wire issue since this model #D380 has two #M190 units built into the same box which is only slightly larger than a single micro-inverter.
Since this new dual micro-inverter does NOT have the AC pass-through wire built-in, you are no longer limited to the wire size that comes in and out for the 240 VAC connections. HOWEVER, they require you to purchase this awful looking multi-tap pigtail cable for the AC connections which has a pre-wired connector spaced the expected distance apart the micro-inverters would be installed, and this is a $950 item for every six dual micro-inverters. When I saw this thing I thought is was a python that had swalled six pepsi cans! Not sure what this will look like on a roof or how well it can be hidden behind the array, but it uses a larger wire size so perhaps the wire loss issue has been resolved.
Jeff Yago
DTI Solar
Netscape. Just the Net You Need.
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