[RE-wrenches] Using legacy modules on micro-inverters

[William Miller]

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-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at 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 <jay at 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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