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I agree, 2 to 3 days works pretty well, but I double check that we
are within the recommended minimum and max charge rates for the
battery. <br>
I found, as Alan mentioned, that many old school designs did not
meet the minimum charge rates, and resulted in sulfated batteries.
Like wise I've come across some recent systems by the new crop of
solar installers, that had grossly undersized batteries. They were
constantly being over charged, and also couldn't supply enough
current to operate the inverter at rated power.<img
src="cid:part1.AA05F139.ED775C0B@solarray.com" alt=""><br>
Aren't those cute? 100 AH just isn't enough battery for a 4 kW
inverter, though.<br>
<br>
<pre class="moz-signature" cols="72">R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760</pre>
<div class="moz-cite-prefix">On 10/15/2016 9:02 AM, Dan Fink wrote:<br>
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<blockquote
cite="mid:CAF+3Lncn82AeYqZ9oA=nRQVDp-NmQ5Lzja8LnUrp-2QYivyLhA@mail.gmail.com"
type="cite">
<div dir="ltr">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.......<br>
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<div><span
style="font-size:12.8000001907349px">Dan
Fink</span>
<div style="font-size:12.8000001907349px">Adjunct
Professor of Solar Energy Technology,
Ecotech Institute</div>
<div style="font-size:12.8000001907349px">IREC
Certified Instructor™ for: </div>
<div style="font-size:12.8000001907349px">~
PV Installation Professional</div>
<div style="font-size:12.8000001907349px">~
Small Wind Installer</div>
<div style="font-size:12.8000001907349px">Executive
Director, Buckville Energy</div>
<div style="font-size:12.8000001907349px">NABCEP
Registered Continuing Education
Providers™<br>
<a moz-do-not-send="true"
href="tel:970.672.4342"
value="+19706724342"
style="color:rgb(17,85,204)"
target="_blank">970.672.4342</a></div>
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<div class="gmail_quote">On Fri, Oct 14, 2016 at 3:55 PM,
Allan Sindelar <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:allan@sindelarsolar.com" target="_blank">allan@sindelarsolar.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div
style="background-color:rgb(255,255,255);color:rgb(0,0,0)"
bgcolor="#FFFFFF" text="#000000"> Dana (and I'm curious
if others agree),<br>
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. <br>
<br>
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.<br>
<br>
You used to live in SW Colorado, a similar sunny winter
climate. Is it the same in Idaho where you live now? <br>
Allan<br>
<br>
<div class="m_-2626908193973126931moz-signature">
<div class="m_-2626908193973126931WordSection1">
<p class="MsoNormal"><b>Allan Sindelar</b><br>
<span style="font-size:10.0pt"><a
moz-do-not-send="true"
href="mailto:allan@sindelarsolar.com"
target="_blank">allan@sindelarsolar.com</a></span><br>
<span style="font-size:10.0pt">NABCEP Certified PV
Installation Professional<br>
NABCEP Certified Technical Sales Professional<br>
New Mexico EE98J Journeyman Electrician<br>
Founder (Retired), <span>Positive Energy, Inc.</span><br>
<b><a moz-do-not-send="true"
href="tel:505%20780-2738"
value="+15057802738" target="_blank">505
780-2738</a> cell</b><br>
<br>
</span></p>
<p class="MsoNormal"><br>
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