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Hi Allan;<br>
<br>
B&B battery, which I've used for years for sealed battery
applications has excellent charts on discharge rate vs time; just
what you need for your design. I've also found them to have stable
voltage under very heavy loads (electric vehicles) right up until
they're fully discharged. I don't really know about the Concordes.<br>
<br>
Ray<br>
<br>
On 2/15/2012 10:53 AM, Allan Sindelar wrote:
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Esteemed fellow Wrenches,<br>
We need to size a battery bank for a GTWB just for starting a well
pump. The well is on its own meter, so as long as the battery
voltage does not crash when the pump starts there will be plenty
of capacity left over for minimal loads. We'll be using sealed
batteries, most likely Concorde SunXtenders. According to
theSunXtender Technical Manual, Concordes can handle up to a C/0.2
charge rate (500A for a 100Ah battery), but there is no discussion
of maximum discharge rates or voltage drop due to large surge
loads.<br>
<br clear="all">
The pump is 3HP and is conventional 3-wire, not soft-start. The
well is 940ft. and the depth to water is unknown. It pumps into a
pressure tank, not open discharge. Customers are not interested in
replacing the pump, but might be talked into adding a soft start
Franklin controller, although at this preliminary design stage
we're not certain one is available for this particular model. The
inverter would be a Radian, so system voltage is 48V.<br>
<br>
I would think that configuration would make a difference, as well
as size. Using 12V batteries in series/parallel would minimize
interconnect and terminal resistance. I think that it would also
allow multiple paths for discharge current, reducing the voltage
dip.<br>
<br>
What's your best guess at the smallest size battery bank that
would reliably start this pump, and how would it best be
configured? <br>
<br>
Thank you,<br>
Allan<br>
<br>
<br>
<div class="moz-signature"> <font face="Times New Roman, Times,
serif"><b>Allan Sindelar</b></font><br>
<small><a moz-do-not-send="true"
href="mailto:Allan@positiveenergysolar.com"><font
color="#000099" face="Times New Roman, Times, serif"><u>Allan@positiveenergysolar.com</u></font></a></small><font
face="Times New Roman, Times, serif"><br>
<span style="font-size: 10pt;">NABCEP Certified Photovoltaic
Installer<br>
NABCEP Certified Technical Sales Professional<br>
New Mexico EE98J Journeyman Electrician<br>
<b>Positive Energy, Inc.</b><br>
3201 Calle Marie<br>
Santa Fe, New Mexico 87507<br>
<b>505 424-1112</b><br>
<a moz-do-not-send="true"
href="http://www.positiveenergysolar.com/" target="_blank"><u>www.positiveenergysolar.com</u></a></span></font>
</div>
<br>
<br>
<br>
<br>
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