I have recently scrounged a bunch of CD Technologies VRLA batteries.
The manufacturers charge rate spec is a bit baffling to me:
"C/5 @ 20 hour rate @ 25deg C."
I'm assuming that they are talking about the discharge rate for the 20 hour constant discharge
So: 5/5 .....1 amp??
Or maybe more like high flyer suggested C20/.025 2.5 amps. With max current C20/.035 3.5 amp
These are standby batteries that have a high discharge rate but apparently a slow charge rate
Model TEL-105-FS
109 a.h. @ 20 hour rate
These are from the Long Duration Series. Phone company backup batteries.
Dave
Hi
i'd think they mean (1/5 of c20) amps = 109/5 = 21.8 amps max up to 14.4 or 14.8v per 12V battery
Cheers
go here.... and have a thorough read :) ;) http://www.cdtechno.com/pdf/ref/41_2128_0212.pdf
to be found here http://www.cdtechno.com/resource/support_doc.html :D
I'll try to dig in but the value they are posting IMHO is for a GT charger tat can pump out constants Amps.
I use an EA of 5 with the WBjr on a 900Ah 24 V setup
im concerned because some of the batteries audibly vent at charge rates above 3.5 amps, apparently they have been abused, the best set will accept sustained 15 amp charge rate, with 4 batteries in series using settings from rolls-surrette battery manual for VRLA , in any case they have been abused....3 banks in parallel driving a 10 kW powermax inverter. (or whatever the name of that Chinese inverter that everyone seems to smoke).he had one smoked one there....charged by 2 FM-80's
WB,
thanks for that lead, I downloaded it into my battery library. It seems that that they recommend charge rates up to C/5 or C/4 for fast charging with voltage limited to 2.4 v.p.c.
Dave
1) Generally, those are disposable telcom batteries, they get cycled 3 or 4 times and then get replaced. They are not deep cycle batteries and will fail after a couple hundred deep cycles, just designed to keep a telcom center working until the generators get running.
2) if you are getting venting from them, you are overcharging and loosing electrolyte (H2o as H & o2 gas) each vent episode damages them more