[RE-wrenches] Enphase 215

[Dave Click]

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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