Wrenches You can do a carbon pile test but the best way is testing under several conditions. Here is an option real easy and maybe faster, put a volt meter on each battery under constant charge conditions, higher volts on one battery meens high resistance in battery, low volts meens low resistance, either extreme can be an issue. Then let sit for at least an hour with no load and check the volts, next put a fixed load on the system, again a volt meter check each battery, here you may find a lower reading then the rest, there is the problem, now replace the entire bank not just the single battery. This is an easy test and the customer can see it easily too. Jerry
Sent via the Samsung Galaxy S™ III, an AT&T 4G LTE smartphone <div>-------- Original message --------</div><div>From: Gary Bassett <g...@hudsonsolar.com> </div><div>Date:09/01/2016 2:51 AM (GMT-10:00) </div><div>To: "RE-wrenches (re-wrenches@lists.re-wrenches.org)" <re-wrenches@lists.re-wrenches.org> </div><div>Subject: [RE-wrenches] Test procedure for Concorde batteries </div><div> </div>We have a grid tied battery backup system that uses 8 Sun Xtender PVX-2120L batteries, about 9 years old. The grid has been going out frequently – about 4 times in the past 3 weeks. When the grid goes out, the battery voltage gets too low and shuts the system down pretty quickly. One of the times, this happened within 4 hours. We want to test the capacity of the batteries and we have a testing procedure from Concorde that seems like it would take a lot of time. Is there a quick way to test the battery capacity? Gary
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