Hello Group.
I have a customer with an XW4548 grid tied with a Classic 200 CC, 16
Evergreen ES-A210's,
8 Interstate L16 Batteries, with generator backup. We have had issues with
it not selling, selling and then charging at high rates way beyond the
settings. This has been an ongoing problem for 6 years and currrently are
18 months into the 2nd battery pack and showing depleted battery life.
Xantrex tech support says that the battery capacity is too small and we are
not setting it up correctly. Before the first set of batteries had one
battery explode, we had spent countless hours with their tech support
trying to get this inverter to behave properly. Even when going through
every setting with tech support, we never got it to work quite right.
Setting to factory defaults did not work. Found that the default absorption
time was 6 hours and the inverter battery charger was pushing up to 75 amps
into this battery, then selling at about 40 to 60 amps DC and then
immediately charging and then selling. I estimate this battery pack may
have had thousands of massive charge and discharge cycles... good reason
for the batteries to be weak now. After a few of these wild cycles, it
would fault with DC overvoltage. It would eventually clear the fault and
do this crazy cycle again. I programmed the inverter charger to the lowest
setting of 10%, Lowered the battery capacity setting to 200 ah from 360,
set the charge timer to not run during the hours we were there. None of
these changes made any significant difference. We also set the maximum
Sell amps AC down to 3 amps which should have kept it at about 720 watts
but we were still seeing it sell up to 2500 watts. Before we reset that,,
it was selling up to 4000 watts.
Could it be a defective SCP. There is no internet there to allow us to see
the past performance.
Does anyone have a clue what is going on. I have worked with Outback
Radians in this same configuration with no problems at all. I am about
ready to rip it off the wall and replace it with a Radian.
John Blittersdorf
Rob Stubbins Electrical and Solar.
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