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I have to complete project of battery charger for 48 V 20 Ah Lead acid battery having 5 A max charging current. I have designed boost pfc using UC3854 and buck converter . Output of buck converter is 48.9 volts and 4.97 amp for 741ohm load resistance. But I have doubt that can I connect output of buck converter directly to battery.

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  • \$\begingroup\$ 48.9 volts and 4.97 amp for 741ohm load resistance. That does not "add up". Ohm's law says: R = V/I = 48.9 / 4.97 = 9.8 ohms. But I have doubt that can I connect output of buck converter directly to battery. You can connect it if you like fireworks and smoke. Do some research how lead acid batteries need to be charged at batteryuniversity.com Then Google "car battery charger circuit" and see how a car battery is charged, figure out why it is done like that. Instead of "doing something" I advise you to spend your time on "doing research", it makes life much easier. \$\endgroup\$ – Bimpelrekkie Mar 19 at 18:16
  • \$\begingroup\$ batteryuniversity.com/learn/article/… Useful link \$\endgroup\$ – Mitu Raj Mar 19 at 18:37

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