Day4 modules [RE-wrenches]

[Phil Undercuffler]

Allan,

While I can't foresee the future to let you know which module
manufacturers will be around in another decade, I can tell you that the
Day4 crew seems to have put the right stuff together.  

As far as the MPP voltage of a 48 cell module, we've seen that cell
arrangement fill a "hole" in the available module range for battery
based applications using MPPT charge controllers.  

Remember when Outback stated that the MX60 is most efficient if the
array voltage is higher than battery voltage?  Can't get there (legally)
with three 24v nominal modules if the temperature gets down below
freezing.  However, a string of four Day4 modules in series stays below
150v even at the maximum NEC derate, and has a MPP above 92 volts at
STC. Sweet.

If using a Blue Sky or Apollo controller, three 48 cell modules = 144
cells in series, which is exactly a 48v nominal array. 

Of course, if using high voltage string inverters then just follow the
manufacturer's string sizing tool.


------------------------------------------------------------
Please note new phone extension!

Phil Undercuffler
Technical Services Manager
Conergy, Inc.
1730 Camino Carlos Rey Suite 103
Santa Fe NM 87507 USA
Office | 505.473.3800 x4841
Fax | 505.473.3830
www.conergy.us

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-----Original Message-----
From: Allan Sindelar [mailto:allan at positiveenergysolar.com] 
Sent: Sunday, July 08, 2007 8:42 PM
To: New wrenches posting
Subject: Day4 modules [RE-wrenches]


Wrenches,
Any experience with the new Day4 modules? (see
http://www.day4energy.com/).
Conergy will soon be carrying them, so I checked out their specs.

It appears that they will offer 36 and 48-cell modules. The 36-cell are
nominal 12V, 115-145W.

The 48-cell have a unique MPP, meaning they won't easily combine with
other
modules. As we have no history on this company to know if it will be
around
years from now, I am hesitant to use something that can't be easily
matched
in the future.

Any more knowledgable opinions or info, please?

Allan at Positive Energy


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