Posts: 3867
| I have a 3-4 year-old Everstart (Wallmart, cold crank 600, master crank 720) deep cycle battery, has a zillion hours of use, but lately it's really acting strange. When I attach the charger (at either 2amp or 15amp) the charger needle constantly swings back and forth between "Fully Charged" and "Charging". (It doesn't really say "Charging", the needle swings out to the amps that are being sent to the battery. I tried the charger on a small 12 volt and everything works as it should, so I don't think the problem is with the charger.
What do you think?
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I just found this....
Float Charge: The 3rd stage of 3-stage battery charging. After batteries reach full charge, charging voltage is reduced to a lower level (typically 12.8 to 13.2) to reduce gassing and prolong battery life. This is often referred to as a maintenance or trickle charge, since it's main purpose is to keep an already charged battery from discharging. PWM, or "pulse width modulation" accomplishes the same thing. In PWM, the controller or charger senses tiny voltage drops in the battery and sends very short charging cycles (pulses) to the battery. This may occur several hundred times per minute. It is called "pulse width" because the width of the pulses may vary from a few microseconds to several seconds. Note that for long term float service, such as backup power systems that are seldom discharged, the float voltage should be around 13.02 to 13.20 volts.
Edited by Ranger 5/10/2008 8:02 AM
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