Suntech 295's... Biggin!
Thats about it!
We did get some 72 cell mods from Oasis Montana (dealer)
We are in the same boat. 14 years of off grid installs!
Jeremy
All Solar
----- Original Message -----
From: Allan Sindelar
To: RE-wrenches
Sent: Thursday, January 24, 2013 12:35 PM
Subject: [RE-wrenches] 24V Module Query
Wrenches,
We have years of installing 36-cell (12V) and 72-cell (24V) modules for
battery-based customers. Most of our systems are 24V or 48V nominal. Over the
last few years, sources of conventionally-sized 72-cell modules have dried up -
as cells have increased in size, most modules and most newer factory production
lines have either gone to 60-cell (20V) modules, or 72 cells in 300+ watt
ranges. It seems that the formerly common 72 cell, 24V modules in the 150-190
watt range, which are well-suited to integrating into existing systems, are no
longer available.
60-cell modules in the common 220-250 watt range can't be added to an
existing system unless run through a dedicated MPPT charge controller that can
convert voltage, such as an FM, XW60, Classic or TriStar; the added cost of any
of these controllers cancels out the low prices of the modules.
Who continues to manufacture 72-cell modules? Which distributors carry them?
I am aware of three options - are there more?
- Sunpower makes one module in the 245 watt range that can be used
negative ground, but it's very high efficiency (and with high Voc/Vmp as well)
and very pricey;
- Sanyo/Panasonic has 225-240 watt modules, but also quite premium and
pricey;
- Ameresco bought the rights to manufacture many former BP modules, and I
think they make some. But we had to replace lots of failed BP modules in that
size range, and are hesitant to use their technology, fearing that the problems
may persist in the continued line.
Thank you for any discussion and recommendations.
Allan
--
Allan Sindelar
al...@positiveenergysolar.com
NABCEP Certified Photovoltaic Installer
NABCEP Certified Technical Sales Professional
New Mexico EE98J Journeyman Electrician
Founder and Chief Technology Officer
Positive Energy, Inc.
3209 Richards Lane (note new address)
Santa Fe, New Mexico 87507
505 424-1112
www.positiveenergysolar.com
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