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I need a charger and battery for a cell phone booster. - Page 12

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Posted by Ron Rosenfeld on October 26, 2009, 11:20 am
On Sun, 25 Oct 2009 22:18:41 -0700 (PDT), philkryder

That information is generally published by the panel manufacturer and
relates to those panels.  There does not seem to be a link to the panel
spec sheets for these panels.

Posted by philkryder on October 29, 2009, 2:08 am

sorry Ron -
I was referring to the comment about correct battery charging voltages
for the batteries.

It sounds like the charging voltages should vary based on the
temperature of the battery.

I was wondering how I could determine what voltage was optimal for the
battery at a given temp.

Sorry for the un-specific question.

Posted by Ron Rosenfeld on October 29, 2009, 11:14 am
 On Wed, 28 Oct 2009 19:08:19 -0700 (PDT), philkryder

Oh, batteries.

I don't know if I've seen published data for that, but I haven't really
looked. The battery mfg's publish data for optimal charging voltages, but
it's usually just at 77F (25C).  They should also publish a
"not-to-exceed" temperature.  The voltages will be different for Bulk,
Float and Equalize modes.  And they will also differ depending on the type
of battery (e.g. flooded lead acid; gel; AGM; etc).

My chargers have a Battery Temp Sensor which effectively alters the
charging voltage depending on the *battery* temperature.  On my SW5548, it
will change the voltage (as the temp varies from 25C) by 0.005 volts/C
in the LEADACID mode; and 0.003 volts/C in the NICAD mode.

Note that the charging voltage varies with the *battery* temperature and
not the ambient temperature.  The sensor is a little thermistor that you
stick on (with adhesive) to the side of the battery.  If it's in a
well-insulated box, it will reflect the internal temperature.

I don't know if the inexpensive chargers have compensators.

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