12 v 7 ah battery charger urgent

[deepakgupta.rf]

hello every one



here i need this design for industrial purpose please guide me.
i controlled my avr microcontroller and it is working fine for its power supply i used 12 v 1 amp dc adapter and in mid we required power in absense of genral power supply so i used 12 v 7ah smf lead acid battery .
but i m confused is that diagram will work fine.or i need any changes
and regarding fuse i m also confused which fuse ( 1, 1.5 or 2 amp ) ishud use and where i shud place

main thing is when power is continue then i can take power from adapter directoly or if power goes then without any power flicks ican take power from battery and battery can be charged properly through adapter.
so please guide me what i shud do for this

 

[kak111]

Lead acid battery needs for full charge Ucharger 13.8V = Ubatt max.
For continuous (float) charging: 13.4 V for gelled electrolyte and 13.8 V for flooded cells

When loaded without charging
100% capacity left, Ubatt = 12.7V
90% left, Ubatt = 12.5V
10% left, Ubatt = 11.3
empty Ubatt = < 10.5V

ie. supply voltage to circuit varies 10.5...13.8V



Normally battery chargers do not load batteries, when ac-power is not connected.
If series diode is added between battery and charger it makes about 0.8V additional voltage drop

Fuse F2 can be included to charger and value depends from charger

Fuse F1 for load , value depends from current needed in load.

More about batteries and charging..........
Basic to Advanced Battery Information from Battery University

 

[deepakgupta.rf]

SIR THNX TO REPLY
but my confusion is same again.
in my design i suppose i shud use 12 v 1.5 amp charger so that in time a 12 v battery can be charged and my kit can be run
continuosly both.
so please check my design and tell me in that what changes i nedd must
please help me

 

[kak111]

There is no problem to run kit same time when charging.

If your kit works lower current than charger current (1.5A) left over is going to charge battery.
If your kit can handle charger max. voltage ( normal charger about 13.6....13.8V)
(check if unsure)