[RE-wrenches] Sealed battery voltages and XW systems

[David Palumbo]

Friends:

We have a client with a Xantrex XW6048 grid tied 3.4kW PV system with
battery backup,(16) Advanced Gel Cells from Power Battery.

Batteries are in an unheated garage space. The charge voltage on the gels at
78F is 57v with float at 54v. The temperature correction (according to my
charts here) says that at 40F the battery voltage would need to be 66v to be
equal to 57v at 78F. We had the Xantrex hi bat cutout set at 65v. The XW
System Control Panel flashed a F-49 error "Hi DC Voltage" recently when the
temps dipped.

I have two questions.

1). We can set the Hi Bat cutout all the way up to 70F. I know this works
out temp comp wise BUT will voltage this high damage sealed gel batteries?

2.) Related to the above issue the XW has not automatically reset itself to
resume grid sell back after temps warmed up. The XW manual seemed to state
that it should automatically go back to selling. This is our first XW. The
tech person I spoke to at Xantrex was very inexperienced and was of little
help the other day. Any suggestions as to who to speak with at Xantrex?

Thanks,

Dave