What is the maximum number of Enphase M215 and S280s that
fit on one string?
Visitor: I want to expand an existing install that I have that
has Enphase M215 inverters (9 on a brand), I wanted to add some S280s' but wanted
to know what the maximum qty of S280s is when added to the M215s?
Michele | RENVU: The maximum S280's and M215 on one string...that is a good
question.
Richard strange: I know with just M215s its 17 but
the s280's say 14
Michele: The scoop is the Amperage of each string is maximized at 80% of 20A (=
16A). 80% --> 20% reduction for a
safety factor. 20A
for the PV breaker that lands in the main panel and the max rating of the
Enphase microinverters. (Note: Darfon microinverters have a 30A maximum.)
Each S280 microinverter has a Nominal Output Current @ 240V
1.13A, thus 14 units can be added to a string reaching an Amperage of 15.82A.
Likewise each M215 has a Nominal Output Current @ 240V 0.9A, thus 17 units can
be added to a string reaching an Amperage of 15.3A.
Following if there is a string of 12 M215’s this makes 10.8A.
There is 6 A available to be utilized by future S280’s. In this example you
could add 4 s280’s to the string. The ending amperage would be 15.32A.
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