Hi i am going to a site with no electricity and just wanted to know how long my leisure battery will last,using fridge tv etc,cheers.
battery
- Thread starter mfc.dave
- Start date
Hi, I have managed to make 12v power last 4 days under normal use, water pump,lights,12v tv (occasional). This was a 85ah battery and still was not anyway near flat but i then connected to the car so i guess it could have done the week easily
Hello David,
To get an idea of how long a battery will last,
A battery has a capacity that is quoted in Amps/Hours (Ah). Most leisure batteries are either 85 or 110Ah capacities.
In theory if you divide the battery capacity by the current (Amps) being used you will get an estimate of how long the battery will supply enough current. - so for example, if yo y are drawing 5A from a fully charged 110 battery it should last 110/5= 22 hours, or 110/10= 11 hours etc.
In practice there are a number of other factors that you should be aware of, as these will affect the life of the battery. assume the current draw to be about 10% more, and that should give a more realistic estimate.
The other problem is estimating the current usage.
Each 12V appliance should have a data plate with a current rating on it. This should indicate how much current the appliance uses
For each appliance, work out how many hours it will be running each day. Multiply the time by the current rating to get the amount of power it will use each day.
Add together all these Amp Hour values for the appliances, and that will give you your total daily power usage. For the reasons above add about 10% to cover losses.
Divide the battery capacity by the power usage to give an estimate of how long the battery should last.
Just a small example of daily usage:
Water pump 15Min at 4A = 1Ah
12V Spot lamp 4Hours at 1A = 4Ah
12V Fl Lamp 4Hours at 1A = 4Ah
Tele 3Hours at 3A = 9Ah
Daily consumption (sum of ind.items) 18Ah
+10% (approx) 2Ah
Daily Consumption Inc losses 20Ah
Battery Capacity/daily Usage = Life
110Ah / 20Ah = 5.5 days
Obviously you need to add up all the lamps and other individual items.
With care you could last a week, especially if you turn off items when they are not being used. You will become more aware of conservation through this process.
Best of luck
To get an idea of how long a battery will last,
A battery has a capacity that is quoted in Amps/Hours (Ah). Most leisure batteries are either 85 or 110Ah capacities.
In theory if you divide the battery capacity by the current (Amps) being used you will get an estimate of how long the battery will supply enough current. - so for example, if yo y are drawing 5A from a fully charged 110 battery it should last 110/5= 22 hours, or 110/10= 11 hours etc.
In practice there are a number of other factors that you should be aware of, as these will affect the life of the battery. assume the current draw to be about 10% more, and that should give a more realistic estimate.
The other problem is estimating the current usage.
Each 12V appliance should have a data plate with a current rating on it. This should indicate how much current the appliance uses
For each appliance, work out how many hours it will be running each day. Multiply the time by the current rating to get the amount of power it will use each day.
Add together all these Amp Hour values for the appliances, and that will give you your total daily power usage. For the reasons above add about 10% to cover losses.
Divide the battery capacity by the power usage to give an estimate of how long the battery should last.
Just a small example of daily usage:
Water pump 15Min at 4A = 1Ah
12V Spot lamp 4Hours at 1A = 4Ah
12V Fl Lamp 4Hours at 1A = 4Ah
Tele 3Hours at 3A = 9Ah
Daily consumption (sum of ind.items) 18Ah
+10% (approx) 2Ah
Daily Consumption Inc losses 20Ah
Battery Capacity/daily Usage = Life
110Ah / 20Ah = 5.5 days
Obviously you need to add up all the lamps and other individual items.
With care you could last a week, especially if you turn off items when they are not being used. You will become more aware of conservation through this process.
Best of luck
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