<div dir="ltr"><div><div>To clarify what Darryl is saying, that is to separate them electrically only. To loosen the main nut holding the stack together is to destroy them permanently. I inherited five stacks that had been in service with good results. I had actually been working the system hard remotely using OpticsRE, so I know they were good. When they were taken out of service for some reason the uninstaller loosened all the main nuts on them. They are now worthless and will not hold a charge, even a 300 watt array will not keep them up, and the slightest load drops them to unusable voltage. So, again don't loosen the main nut for any reason. If you have some I'd consider staking that nut so it cannot be loosened without drilling. <br><br></div>Brad<br></div>AEE Solar<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Jan 30, 2018 at 12:10 PM, Darryl Thayer <span dir="ltr"><<a href="mailto:darylsolar1@gmail.com" target="_blank">darylsolar1@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Since the cells stack in series the low voltage cell must be discharged. they are under compression, However If they are disconnected and charged separately perhaps they can be brought back. Are these batteries used in frequent cycles or just backup power? Lead Acid depends upon overcharge immunity, thee may not have that. If they are not overcharging the good cells the weak cells will continue to discharge until the battery has some very weak cells. </div><div class="gmail_extra"><br><div class="gmail_quote"><div><div class="h5">On Tue, Jan 30, 2018 at 9:42 AM, Tom Duffy <span dir="ltr"><<a href="mailto:Tom@solar-biz.com" target="_blank">Tom@solar-biz.com</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5">We have a situation with a customer's Aquion (Understand there's now longer a warranty) I spent some hours looking at the Aquions. I tested the voltage of each cell. 4 out of the 6 stacks had a cell that was low, in the range of 0, 3, 4, volts, while all the rest were above 6.<br>
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Each of the cells has a test point above the connector. The cells that were low each have corrosion on the positive terminal, such as you see in the photo. Any ideas as to what is causing this? Has anyone seen this before?<br>
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