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Peter, The specific answer to your question from the manufacturer starts with the fourth paragraph on page 19, Section 5.4 "Charging" of the SunXtender Technical Manual, available at http://www.sunxtender.com/pdfs/Sun_Xtender_Battery_Technical_Manual.pdf. Concorde recommends a minimum "for repetitive deep cycling" of C/5, or 41A at 24Vnom for your pair, and a maximum inrush of C/0.2 (1,040A !) Allan Allan Sindelar On 2/27/2011 1:35 PM, Peter Parrish wrote: We have a portable "demo-off grid" system (24 Vdc, 120 Vac, 1kW-ac) and occasionally we end the day with a fairly deep discharge 11.6-11.7 V (80% DoD).I like to get a deeply discharged battery back up to 100% capacity as soon as possible (as opposed to letting the 850 W PV / charge controller system charge it up over a several days) and I have a AC battery chargers with "20A', "10A" and "2A" bulk settings along with being able to choose, "wet", "gel" and "AGM" settings. Our battery of choice is a SunXtender AGM battery (PVX-2120L, 12V 253 amp-hr (C/120). My question: Starting with this battery at say 11.6 volts (open circuit), is it safe to begin the bulk charge at ~8% of its C/120 capacity (i.e. 20A), and let the charger go into absorption at 14.4 V (with temperature correction of course) and finish at 2A? How high could I safely start the bulk charge? Peter T. Parrish, Ph.D., President California Solar Engineering, Inc. 820 Cynthia Ave., Los Angeles, CA 90065 CA Lic. 854779, NABCEP Cert. 031806-26 [email protected] Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885 |
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