[RE-wrenches] Sealed battery voltages and XW systems

[Nick Lucchese]

Greetings David,

I believe your decimal point was one tenth over from where it needs 
to be. For a 48v system using the standard .067 per degree F I 
calculate your absorption set-point to 59.5 vdc. Did the batteries 
already see 65v? Any bulging or signs or failure yet? Was the chart 
you referred to in the XW manual?



Nick A Lucchese




>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
>
>
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-- 
Nick A Lucchese
NABCEP Certified PV Installer
Planet Home
General Contractor # 808851
Sierra Solar Systems
563C Idaho Maryland Road
Grass Valley, CA 95945
tech info and foreign orders:  (530) 273-6754
order line: (800) 51-SOLAR (US only)   FAX:  (530) 273-1760
e-mail:  <mailto:nickl at sierrasolar.com>
world wide web:  <http://www.sierrasolar.com>