Power used by 48 LED cabin light?

[Taroona]

You can try this if you have a digital multimeter

Connect the positive of the LED to the pos terminal of a battery the pos of the digital multimeter to the neg of the LED and the neg of the meter to the neg on the battery

make sure you have the meter to current and you will be able to measure the amps drawn by the LED's

Les

[tigermullet]

Thanks very much Taroona. I have copied that and will keep it until it is burned into my memory. That's one of the best pieces of information ever received because I didn't have a clue of how to go about it.

[Hamish73]

just remember to switch the meads and switch back to voltage when you are finished. If you attempt to measure a voltage with the meter in current mode at best it will blow the fuse inside the meter (if it has one), at worst it will destroy the meter.

[Melec]

Les of Taroona , your calculations are close to sound but . When you have a battery rated at say 100AH you only have 40% AVAILABLE . New thinking on deep cycle batteries is only ever discharge them 40% before recharge .

[Taroona]

I wasn't suggesting that the battery would last the 300 odd hrs, merely trying to show how to get the loading and do a rough calculation on battery life.

If an accurate calculation of battery life is needed it would be prudent to get discharge rates from the manufacturers. This is also dependant on temperutre of battery and type of battery i.e. wet cell, gel cell, and many others