Hello Ray, Glad to be helpful...
The basic scope of the IEC 61427standard is to provide general information relating to the requirements of batteries in RE applications, and more importantly, the test methods that will test the battery's ability to do well in RE applications. The standard covers several tests. The most relevant tests are: * Capacity test * Suitability for floating operation * Cycle endurance test at partial state of charge (deficit charging) * Endurance test in overcharge * Charge retention test Most of the tests are very typical for battery characterization. The most important test is the cycle endurance test at partial state of charge because it tests battery's ability to do well even when the battery doesn't get a full charge, which happens all too often in RE applications. This is also a high temperature test, so it tests the battery's ability to do well in extreme temperatures. The battery fails the test if the capacity falls below 80% or its rated capacity, or if the voltage falls below a certain threshold. Below is a graph of what the test looks like. [cid:[email protected]] Each block represents a year. This test ran about 13 years... Please let me know if this provides enough information/background, or if you have any other questions. Thanks for your reply. Best Regards, Ronald Paredes Technical Product Manager - Renewable Energy Trojan Battery Company 12380 Clark Street Santa Fe Springs, CA 90670 Tel: (562)236-3000 Ext. 3066 Fax: (562)236-3279 [email protected]<mailto:[email protected]> www.trojanbattery.com<http://www.trojanbattery.com/> Trojan Battery Company - Clean Energy for Life(tm) From: [email protected] [mailto:[email protected]] On Behalf Of R Ray Walters Sent: Wednesday, July 14, 2010 10:33 PM To: RE-wrenches Subject: Re: [RE-wrenches] Trojan L16 2v vs 6v I do not have experience with the IEC standard you referenced, but anything that would more closely approximate real world conditions would be very beneficial. We're still having trouble getting good cycle life info from many manus, so we appreciate your ready reference information. Of course I've come to expect that from Trojan, already. Thanks, R. Walters [email protected]<mailto:[email protected]> Solar Engineer 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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