According to my discussions with Enphase on this subject, the M215 can actually put out 225 watts continuous.
Marv? Please confirm. marco 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 > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options& settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules& etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org