The inverter should be current-limited on its output. The other Enphases
have a higher output power than rated (199 @ 190, 219 @ 210, if memory
serves from earlier list posts), so this may have a similar window.
215Wac max inverter output / 240V = 0.896
0.896 x 17 = 15.23A
15.23A x 1.25 < 20A so it's OK.
As long as the inverter output is actually 225W or less, you can fit 17
on a 20A circuit.
As before, you'd have the inverter limiting output when the high-power
modules are actually performing near or above STC. There will certainly
be times during the year where the inverters are maxed out but those
times will be a small portion. Enphase had some documentation on their
site about this where they claimed it wasn't worth worrying about, but
it's a site-specific question that the installer should answer.
On 2011/8/24 0:20, Keith Cronin wrote:
Hey gang
With the 215's on the scene and the tech literature on their website,
they state you can put up to 17 modules on a string.
Locally, I see folks throwing on 17-235 watt modules. Back of the
napkin- 235 watts/240 volts = .97 amps.
17 x .97 = 16.49 amps on the 20 amp circuit. Pushing the envelop of the
circuit, per NEC and in situations of lower voltage, could tip the
current higher, per module it seems or is the unit current limiting?
Wouldn't it seem plausible to ebb on 16 vs the 17? The 15 amp circuit to
20 amp circuit also is a change for the industry at large, as well as a
few other changes.
As Solarworld is rolling out their 250 watt and others in the same zone,
it seems there should/could be some caveats on the enphase literature to
reflect this.
Thoughts, comments?
Keith
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