[RE-wrenches] Test procedure for Concorde batteries

[Tump]

Gary I would suggest that the battery manufacture’s recommended method is followed. Yeah it IS time consuming BUT…
Checking w/ a clamp on during a charge or discharge depending on the  # of strings &/or the way the strings are configured will be misleading.
Your customer is paying by the hour and a the choice is theirs replace OR pay your tech to watch the voltage/current over the manu’s discharge time.
These batteries can be run thru an equalization cycle, following the guide lines recommended by Concord, then do your load test. Full charge to discharge over time IS the only way.
> On Sep 1, 2016, at 8:51 AM, Gary Bassett <Gary at hudsonsolar.com> wrote:
> 
> 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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