[RE-wrenches] unique battery bank design question

[John DeBoever]

Mac,

Never tap a battery bank off various voltages. This will result into unbalanced battery units, thus confusing the charger, resulting into unbalance charge, boiling ones and sulfating others occurring, killing the battery fast...
When facing various loads with various operating voltage 12V, 24V, 48V, configuring the battery bank for the larger load voltage is recommended (due to losses optimization) and use DC/DC converters for the other loads.  Note that it is easier to find step-down DC/DC converters. Consider high efficiency DC/DC converters. Typically not less than 85%. Expensive ones have 90-95% efficiencies.

John
John F. DeBoever
Global Projects Director - Renewable Energy
Trojan Battery Company

12380 Clark Street
Santa Fe Springs, CA 90670
Tel: +1-562-236-3000 Ext. 3139
Cell: +1-514-514-7600 - Time Zone: EST USA (GMT-5)
Fax: +1-562-236-3239
jdeboever at trojanbattery.com<mailto:jdeboever at trojanbattery.com>
NEW WEBSITE - http://www.trojanbatteryre.com/

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From: re-wrenches-bounces at lists.re-wrenches.org [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of mac Lewis
Sent: Thursday, September 01, 2011 3:52 PM
To: RE-wrenches at lists.re-wrenches.org
Subject: [RE-wrenches] unique battery bank design question

Hello wrenches,

I have a battery bank questions.  I have an Oil & Gas client interested in setting up an off-grid control system that has a various DC loads at 12VDC, 24 VDC and 48 VDC.  My thought is to build a 48 V battery bank and tap off the bank at various points to create a 12V bus, 24V bus and 48V bus.  I am a bit concerned about unequal loading of the batteries.  Has anyone dealt with something like this that would like to share some insight?

Thanks

--



Mac Lewis

"Yo solo sé que no sé nada." -Sócrates



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