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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hi Jamie,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>How do these values correlate to the larger Rolls batteries? We
have a number of the 2-KS-33’s out there along with other various sized large
Rolls battery banks.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:navy'>Sincerely,<br>
<br>
Chris Worcester<o:p></o:p></span></p>
<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:navy'>Solar
Wind Works<br>
NABCEP Certified PV Installer<br>
Phone: 530-582-4503<br>
Fax: 530-582-4603<br>
<a href="http://www.solarwindworks.com/">www.solarwindworks.com</a><br>
<a href="mailto:chris@solarwindworks.com">chris@solarwindworks.com</a><br>
"Proven Energy Solutions"</span><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <b>On Behalf Of </b>James
Surrette<br>
<b>Sent:</b> Wednesday, January 13, 2010 11:43 AM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] discharging Rolls batteries<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>Hi
Hugh & Wrenches,</span> <o:p></o:p></p>
<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><o:p> </o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>Regarding
the charge voltages you sited, you've got the gist.</span> <o:p></o:p></p>
<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><o:p> </o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>As
battery temperature drops, you need to increase the charge voltage to properly
charge and, conversely, as temperatures rise, voltage needs to be decreased to
reduce the risk of overcharging.</span> <o:p></o:p></p>
<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><o:p> </o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>I
believe the range we site to accommodate for temperature is (in C);</span> <o:p></o:p></p>
<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><o:p> </o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>0-16C:
2.5VPC</span> <o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>17-27C:
2.4VPC</span> <o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>28-40C:
2.36VPC</span> <o:p></o:p></p>
<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><o:p> </o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>These
are your max bulk / absorb voltage settings.</span> <o:p></o:p></p>
<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><o:p> </o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>Regarding
a low voltage disconnect, there is a significant difference between on load and
at rest voltages at 50% SOC.</span> <o:p></o:p></p>
<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><o:p> </o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>Below
is a table of a cell being discharged at a known constant load (C/20) over time
at 25C;</span> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:
12.0pt;margin-left:0in'><o:p> </o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>SOC
VPC</span> <o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>100%
2.1</span> <o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>75%
2.01</span> <o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>50%
1.93</span> <o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>25%
1.84</span> <o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>0%
1.75</span> <o:p></o:p></p>
<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><o:p> </o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>Please
note, this is for a cell(s) under constant load and at 25C. If the load
increased, you would see lower voltages more quickly, Moreover, once the
load is removed, resting voltages will increase dramatically, i.e. 1.75VPC on
load will equal ~1.95VPC at rest. If you were using 2.0VPC (on load) as
your cut off, you would only have been able to discharge ~25% - which does not
include capacity reduction due to temps <25C.......and I know they are lower
than that here!</span> <o:p></o:p></p>
<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><o:p> </o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>Hope
this is of some assistance.</span> <o:p></o:p></p>
<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><o:p> </o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>Regards,</span>
<o:p></o:p></p>
<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><o:p> </o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>Jamie</span>
<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:
12.0pt;margin-left:0in'><br>
<br>
<o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'><br>
James Surrette<br>
<br>
Surrette Battery Co. Ltd<br>
1 Station Rd.<br>
Springhill, NS, CAN<br>
B0M 1X0<br>
<br>
Direct: 902.597.4027<br>
Fax: 902.597.8447<br>
<br>
<br>
<br>
<br>
>>> Hugh <hugh@scoraigwind.co.uk> 1/13/2010 2:26 PM >>></span>
<o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>Hi
wrenches,</span> <o:p></o:p></p>
<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><o:p> </o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>I
have been selling and using a few sets of Rolls 4000 series S530</span> <o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>batteries
lately.</span> <o:p></o:p></p>
<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><o:p> </o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>I
have downloaded the Solar Battery manual from </span><i><u><a
href="http://www.rollsbattery.com"><span style='font-family:"Lucida Grande","serif"'>www.rollsbattery.com</span></a></u></i>
<o:p></o:p></p>
<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><o:p> </o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>It's
very interesting. At 17 degrees C you need to charge at 14.4</span> <o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>volts.
At 16 degrees it's 15 volts. Hmm, Ok I get the idea. I am</span> <o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>certainly
learning to compensate my temperatures this winter.</span> <o:p></o:p></p>
<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><o:p> </o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>I
did a search in the document for the word 'discharge'. I am</span> <o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>cutting
off at just below nominal voltage and starting my generator.</span> <o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>I
do not get much capacity. A customer has suggested that a lot of</span> <o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>the
discharge capacity is to be had at 11.5 volts (he has a 12v</span> <o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>system
obviously). Hmm. Sounds a bit harsh. But what voltage</span> <o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>should
I be considering to be 50% discharged, and time to start the</span> <o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>genny?
And in a hard frost, the same voltage?</span> <o:p></o:p></p>
<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><o:p> </o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>No
mention of discharge in the solar battery manual. Any ideas anyone?</span>
<o:p></o:p></p>
<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><o:p> </o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>Please
don't tell me to buy an amphour meter (or worse still to sell</span> <o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>them).
Those things are way too confusing to calibrate. I can tell</span> <o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>you
that I am not getting many amphours out of my batteries in these</span> <o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>low
temperatures before the voltage per cell drops below 2.</span> <o:p></o:p></p>
<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><o:p> </o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>What
do I tell my customers about the end-of-discharge voltage for</span> <o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>sustainable
cycling of their Rolls batteries? And is it temp</span> <o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>compensated?</span>
<o:p></o:p></p>
<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><o:p> </o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>thanks</span>
<o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>--</span>
<o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>Hugh
Piggott</span> <o:p></o:p></p>
<p class=MsoNormal style='margin:0in;margin-bottom:.0001pt'><o:p> </o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>Scoraig
Wind Electric</span> <o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>Scotland</span>
<o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><i><u><a
href="http://www.scoraigwind.co.uk"><span style='font-family:"Lucida Grande","serif"'>http://www.scoraigwind.co.uk</span></a></u></i>
<o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>_______________________________________________</span>
<o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>List
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<p style='margin:0in;margin-bottom:.0001pt'><span style='font-family:"Lucida Grande","serif"'>List
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