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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.