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 jdeboe...@trojanbattery.com<mailto:jdeboe...@trojanbattery.com> NEW WEBSITE - http://www.trojanbatteryre.com/ [Description: Description: Description: Description: Description: Description: Description: cid:image001.jpg@01CB52C7.9D20C090] From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of mac Lewis Sent: Thursday, September 01, 2011 3:52 PM To: RE-wrenches@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 This e-mail message and any attachments that accompany it may contain information that is confidential, privileged, or protected from disclosure. It is intended solely for the use of the individual(s) to whom it was intended to be addressed. If you have received this e-mail by mistake, or you are not the intended recipient, any reading, disclosure, copying or other use of this communication is strictly prohibited. If you have received this communication in error, please immediately advise the sender at their phone number listed above, or by electronic mail, and also permanently delete the original and all copies of this e-mail and any attachments from all locations. Thank you.
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