Right. Besides that, batteries  have a shelf
life. A few years down the line, the client will
need to replace the bank. A $10K reinvestment
after a few years could erase any cost
effectiveness of an off grid system. In many
cases they could pay the extra money and hook up to the power line now.

At 11:02 AM 10/15/2016, you wrote:
My design philosophy these days matches yours
100%, Allen. Because of cheap PV, and FLA
batteries still stuck in the 1910s. It was a
different story (not too many years ago!) when a
good deal on PV was $5 a watt.......

Dan Fink
Adjunct Professor of Solar Energy Technology, Ecotech Institute
IREC Certified Instructor™ for:Â
~ PV Installation Professional
~ Small Wind Installer
Executive Director, Buckville Energy
NABCEP Registered Continuing Education Providers™
<tel:970.672.4342>970.672.4342

Â

On Fri, Oct 14, 2016 at 3:55 PM, Allan Sindelar
<<mailto:al...@sindelarsolar.com>al...@sindelarsolar.com> wrote:
Dana (and I'm curious if others agree),
I used to work with 4-5 days of storage, back
with modules were expensive and batteries were
relatively cheap. As in recent years these two
have reversed - modules are cheap and batteries
are dear - my fundamental design approach has
changed. I now design around 2-3 days of storage
with a larger array, as long as there's a backup
generator in the system. I size to at least 100%
of the projected winter average daily load.

The batteries recharge more quickly, including
on partly cloudy days between storms. They spend
more of their time full, thus keeping them
happier and giving them as much or more life,
even with more and deeper cycling. FLAs are
easier to EQ, given the hotter charge rate. And the customer spends less.

You used to live in SW Colorado, a similar sunny
winter climate. Is it the same in Idaho where you live now?
Allan
Â

Allan Sindelar
<mailto:al...@sindelarsolar.com>al...@sindelarsolar.com
NABCEP Certified PV Installation Professional
NABCEP Certified Technical Sales Professional
New Mexico EE98J Journeyman Electrician
Founder (Retired), Positive Energy, Inc.
<tel:505%20780-2738>505 780-2738 cell


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