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12volts battery charger Answered

Hi everyone, Please I need a simple 12battery charger with automatic transfer switch that can charge one battery while the other is in use With high current

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0
ayesha.salman788
ayesha.salman788

13 days ago

Hey There
Have you checked Apc Smart RC 600w 96VDC Battery charger as I'm using this and I keep charging my one battery as the others is in use. So I guess you can give a try to this.

0
Orngrimm
Orngrimm

21 days ago

I am not sure if i understand you correctly:
- You have 2 batteries
- You have 1 Charger
- You use and discharge one battery and this battery is not chraged during this time
- The other battery is in charging and is not used/discharged
- As soon as the first battery is depleted, the second battery gets disconnected from charging and is not used for discharging. The first battery now becomes charged while the second battery gets discharged

Is this behaviour correct?
Do you already have the charger?
I would do it with a small Microprocessor and some Relais honestly...

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charlesO62
charlesO62

Reply 20 days ago

Yes
One battery should provide power for my inverter
Will the other is been changed
Once the one in use is discharged,the other should automatically take over and the discharged battery should start charging
About the charger,am planning on using a 19volts charger or a 14volts transformer
Please it's a little project I need to finish before the end of the semester
Please help me

2
Orngrimm
Orngrimm

Reply 20 days ago

I suggest getting a normal Batterycharger from the store for like 5$.
For the "brain", i suggest a super short Arduino-Code with a small Arduino and 2 solid state relays or normal relays. Just be sure the have a freerunning diode if you use normal relays or you kill your Arduino in no time. Also, Normal relais may beed a Transistor to have proper current. A solid state relays does have none of all those problems.

See https://pastebin.com/y8zQZwYN for a first (untested) code for a Arduino Pro micro (2$ from china)

Be sure you read and understand the comments on top on how to connect it up and have the voltage dividers set up.

The code *should* start with battery 1 active for discharge and battery 2 active for charge. As soon as bat1 has a low voltage, it checks during around 2 seconds if the voltage is low in average and if yes, switches over the batteries.
Now the same game is on with reversed batteries. As soon now bat2 is low, it gets checkd for around 2 secs and then switched over back to bat1 which is charged now a bit or maybe even fully by this time...

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Orngrimm
Orngrimm

Reply 16 days ago

I just realised that I forgot to convert the decimal output from analog.read to volt.
Check http://www.skillbank.co.uk/arduino/measure.htm for how to set a good (internal) reference and convert the value to voltage.
be sure your voltage divider divides enough so that the max applied voltage is below reference voltage chosen.

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Omnivent
Omnivent

19 days ago

Or parallel the (equalized) batteries and keep the charger going on both during use and until V_ch_max is reached.
.
Is this a school project? If so, isn't it _you_ who should do it? ;)
.
Have a nice day :)