Nick:
What is the upper voltage limit for the M250? What happens when that voltage is exceeded? I am trying to use Siemens SP75 modules (two in series) and Shell SQ-150-PC. Below are the specs. Note that two SP75s in series, if you multiply the voltages by two, is identical to the SQ-150 except for the temperature compensation. I am not sure what to do with the temperature compensation value if I put two SP175s insereis. Do you know? Qty Watts Ext Watts Pmax Vpmax Ipmax Isc Voc Temp Coefficient of Voc Siemens PC4JF (Same as the SP75?) 12 75 900 75 75 17 4.4 4.8 21.7 -0.077 Shell SQ-150 3 150 450 150 150 34 4.4 4.8 43.4 -0.161 Our record low is -10 C and average high is 38C. If I enter the data for the Shell, the calculator shows they are compatible with the M250. Entering the data for two SP75s using -0.077 for Temp Comp (SP75) the tool says not. If I use double (-0.154), then the two SP75s are compatible. What is your determination? Thanks, William From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Nick Soleil Sent: Monday, September 30, 2013 9:56 AM To: RE-wrenches Subject: Re: [RE-wrenches] Using legacy modules on micro-inverters Hi wrenches, The M250 is not limited to 60 cell modules only. The M250 has an expanded voltage window which will allow for it to be paired with a wider range of modules. Enphase has an online module compatibility calculator which can be used for checking a specific pairing in a specific location, at: http://enphase.com/module-compatibility-calculator-m250-update/. Keep in mind that many of the high efficiency, higher voltage, 72 cell modules will not be compatible. On Sat, Sep 28, 2013 at 6:45 AM, Jay Peltz <j...@asis.com> wrote: Hi Bill Is there a new M250? Enphase shows the 250 at 48vdc max and states 60 cell only modules. That would be nice if it did both Jay Peltz power.
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