12 volt car battery for 12v outdoor lights
- Thread starter jaguar1
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50/12=4.16 amps so 80/4.16=19.23 hours, theoretically.
A
Alarm
And it will run down faster and faster as not designed for this.
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lesiure battery is what you need.
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There are two basic types of lead acid battery.
The car battery is designed to give high amps but immediate re-charge after use and not deep cycled.
The traction battery is designed to be deep cycled but relativity low amps.
The leisure battery is half way between the two.
All lead acid batteries should be stored charged as the sulphur will go hard on the active material if left too long. With a car battery they are recharged by controlling the float voltage slightly on the high side at around 13.8 volt. (Based on 12v nominal voltage) But with traction batteries it would take far too long to charge like that so often a three stage charger is used.
Stage 1 Max amps until volts reach around 14.8 volt.
Stage 2 High volts until amps drop to around 5 amp.
Stage 3 Low (Float) volts around 13.2 volt.
Even with that method it will take around 8 hours to fully recharge a fully discharged battery.
One week is about the limit on leaving a battery without re-charging.
Using a car battery for deep cycle it will only last around 6 months. Traction battery around 7 years. Ni-Iron around 25 years (Found on buses and milk tankers)
The alkaline battery be it Ni-Iron, NiCad, or Ni-Mh should be stored discharged opposite to an acid battery. Some Ni-Mh are now designed to hold their charge a lot longer and as sold ready charged so are odd ones out.
The car battery is designed to give high amps but immediate re-charge after use and not deep cycled.
The traction battery is designed to be deep cycled but relativity low amps.
The leisure battery is half way between the two.
All lead acid batteries should be stored charged as the sulphur will go hard on the active material if left too long. With a car battery they are recharged by controlling the float voltage slightly on the high side at around 13.8 volt. (Based on 12v nominal voltage) But with traction batteries it would take far too long to charge like that so often a three stage charger is used.
Stage 1 Max amps until volts reach around 14.8 volt.
Stage 2 High volts until amps drop to around 5 amp.
Stage 3 Low (Float) volts around 13.2 volt.
Even with that method it will take around 8 hours to fully recharge a fully discharged battery.
One week is about the limit on leaving a battery without re-charging.
Using a car battery for deep cycle it will only last around 6 months. Traction battery around 7 years. Ni-Iron around 25 years (Found on buses and milk tankers)
The alkaline battery be it Ni-Iron, NiCad, or Ni-Mh should be stored discharged opposite to an acid battery. Some Ni-Mh are now designed to hold their charge a lot longer and as sold ready charged so are odd ones out.
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