Radio Power Supply 12 Volt Battery Charger

248

03:25:02

On left is 13.8 volt 15 amp power supply being used to charge the 9.5 volt lead acid battery below.

Since this a MANUAL approach the charged battery has to be watched for over heating and to hold charging amperage around 5 amps or lower as voltage comes up on discharged battery.

Probably not the method of choice but a possible method to use on battery backup charging.

If someone has used this method before I welcome suggestions.

published 5 years ago

fatcat2

5 years ago

@Imccoig, what voltage is needed for fast-charging a 12V lead acid battery? I used to charge mine with a 15V 10A SMPS adapter, which I had salvaged from an induction heater. The battery used to get really hot and so I stopped charging them.

lmccoig

5 years ago

13.8 volt is recommended and have control of amperage while keeping watch on heating of battery.

badassfromaus

5 years ago

Try this one http://everycircuit.com/circuit/5656096333889536

fatcat2

5 years ago

How can I control the amperage of the smps? Using a resistor wastes a lot of power.

BillyT

5 years ago

@Imccoig, the problem with battery charging circuits as you have displayed is, once the battery is upto the desired Float Voltage, it must be removed from the charger. If it is not removed, it will eventually reach the voltage of the charger, and boil off its electrolyte. @fatcat2, a fully charged 12V lead battery has a settled float voltage of 13.2V. For constant voltage chargers, 13.6V is recommended for gel type batteries, 13.8V for other wet cell batteries. Smart chargers boost charge at 14.2V then drop to the level required for constant charging. 2. It is normal to control the voltage level of a smps, that eliminates the use of a shunt measure resistor.

fatcat2

5 years ago

@BillyT, I charged my battery at 13.6V as you had instructed. The battery still got hot but it's okay, I guess. However, it took nearly 4.5 hours for the charging to complete.

BillyT

5 years ago

How many amp/hours we dealing with?

fatcat2

5 years ago

4.5AH

BillyT

5 years ago

A battery on charger will get warm, experienced maintainers know how warm is hot. Read the following document for some battery charging info. https://www.pveducation.org/pvcdrom/battery-characteristics/battery-charging-and-discharging-parameters

add comment in editor

EveryCircuit is an easy to use, highly interactive circuit simulator and schematic capture tool. Real-time circuit simulation, interactivity, and dynamic visualization make it a must have application for professionals and academia. EveryCircuit user community has collaboratively created the largest searchable library of circuit designs. EveryCircuit app runs online in popular browsers and on mobile phones and tablets, enabling you to capture design ideas and learn electronics on the go.