View Single Post
  #10   Report Post  
Posted to alt.home.repair
Steve B[_10_] Steve B[_10_] is offline
external usenet poster
 
Posts: 3,055
Default How cheap can a cheap battery charger be?


"larry moe 'n curly" wrote in message
...


wrote:

Can you see all the components inside? If there's nothing there
except a transformer, some diodes, an ammeter, and a circuit breaker
or two, it's a manual charger and can overcharge batteries and damage
them. OTOH the simplest automatic chargers for lead-acid batteries
have voltage limiters calibrated to about 2.3V per cell, meaning at
full charge they'll put out less than about 1/2 amp and can be left
connected for at least a couple of days after full charge. These
voltage limiters usually consist of a regulator chip controlling an
SCR (about 1/2" square plastic thing with 3 leads on it). Better
chargers will shut off completely at full charge but will restart when
the voltage drops to roughly 2.1V per cell. Old style chargers are
heavy because they have a big 60 Hz transformer, but newer designs use
a much smaller transformer that works at high frequency, and these
always have elaborate control circuitry to completely shut off the
current at full charge.


These are 36 Volt golf cart Chargers.


What in my reply doesn't apply to 36V golf cart chargers?


Hey, MOE!

It applies.

He just can't apply it.

nyuk. nyuk.

Steve

visit my blog at http://cabgbypasssurgery.com