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Capacitive Charger / De-Sulfator
By John Loveless
www.JohnSavesEnergy.com
Mostly dead means it’s slightly alive.
Bridge Rectifier Circuit
Charger/De-Sulfator Circuit
Choosing a capacitor
Choosing a capacitor
It Must Be
•Bi Polar
•Low ESR
•High Quality
•Rated for AC voltage
•RMS * 2 √ 2 *peak voltage
120 v * 2.828 = 340 volts
240 v * 2.828 = 680 volts
Equivalent Circuit
Equivalent Circuit
Equivalent Circuit
Equivalent Circuit
Equivalent Circuit
Equivalent Circuit
Charger/De-Sulfator Circuit
Charger/De-Sulfator Circuit
Charge Rate Rule of Thumb:
1 Amp of charge for every
25 µF of capacitance
Charger/De-Sulfator Circuit
Charge Rate Rule of Thumb:
1 Amp of charge for every
25 µF of capacitance
A Comparable 2500 watt 120VDC
battery charger costs $900.00
This circuit only cost me
60
Charger/De-Sulfator Circuit
In theory, you can charge a
lead-acid battery to 80%
charged in 6 minutes.
Charger/De-Sulfator Circuit
In theory, you can charge a
lead-acid battery to 80%
charged in 6 minutes.
To restore 12 kWh back into a large
battery bank in 6 minutes would
require a 500 Amp charger.
Or 500 x 25µF = 12,500 µF.
500 A at 240 V = 120,000 Watts.
Charger/De-Sulfator Circuit
Lamp
Timer?
6-volt lead-acid batteries have 3 cells, 12 volt ones have 6 cells
80% charged is 2.38 volts per cell (14.28 Volts for a 12 Volt battery)
Bubbling and gassing starts to occur at 80%
100% charged is 2.58 volts per cell (15.48 Volts for a 12 Volt battery)
Vigorous bubbling and lots of gassing occurs at 100%
Charger/De-Sulfator Circuit
Not only does this circuit charge batteries,
it also brings “mostly dead” batteries back to life.
Mostly dead means it’s slightly alive.
Equivalent Circuit
Charger/De-Sulfator Circuit
Cost of Materials
Large 25 µF capacitor at NPS
Bridge Rectifier 20 Amp
Wire and connectors
Total Cost
$4.50
$5.00
$8.00
$17.00
Plus Kill-A-Watt meter $20 and Cheap Volt meter $7
Charger/De-Sulfator Circuit
Pros: Inexpensive, easy to make.
Cons: Horrible power factor, no inherent fail safes.
Not suitable for Lithium/LiFeP04 batteries. Beware if you do.
Can damage attached electronics not rated for voltages.