could i use it without damaging the battery. Thanks to others on this site i have worked out that it should run for 65 minutes, but i have been told that lead acid batteries should not be completely discharged or they will fail quickly. With this in mind, how many minutes could i run this battery/ lamp combination before i am getting close to damaging the battery? I want to be able to use it and recharge it once a week for 2 years or so. Thanks for your help.
2007-11-16 11:04:25 · 7 answers · asked by Anonymous in Science & Mathematics ➔ Physics
If you are happy with the 65 minutes calculation you have (incidentally is correct) which is purely theoretical, the practical rule of thumb is not to exceed 70% discharge of the battery, which will give you (70% of 65minutes) 45minutes.
If you had an Alkaline battery (NiCad) you could use the full 65 minutes.
2007-11-17 23:01:06 · answer #1 · answered by The Rugby Player 7 · 0⤊ 2⤋
Lead acid batteries do not mind relatively large currents but do not like being fully discharged. That said, some types can stand more discharge than others. A standard battery designed for car or motorbike starting should not be run down to less than half rated capacity if you want it to last. If you have a special "deep discharge" battery, you can run it close to full discharge - but then they have lower maxikum currents - check the specification.
2007-11-16 11:42:22 · answer #2 · answered by greenshootuk 6 · 0⤊ 0⤋
Unless it's a deep discharge battery, 5 minutes a day is probably your practical limit. That's just a rough guideline based on experience. That assumes nearly ideal charging and proper maintenance (keeping the fluid level adequate, and always above the plates).
2007-11-16 18:13:51 · answer #3 · answered by Frank N 7 · 0⤊ 0⤋
I wouldn't have thought that completely discharging a battery would ruin it, provided the discharge was gradual which I would list yours as so. You could put a 12v relay in the circuit utilising the battery voltage to hold it on then when the voltage falls below 12v it would disconnect the circuit
2007-11-17 05:15:53 · answer #4 · answered by Paddy 4 · 0⤊ 0⤋
The Current drain at that rate will be enough to do damage to your battery. Lead acid batteries do not like high discharge rates.
2007-11-16 11:17:10 · answer #5 · answered by Anonymous · 0⤊ 2⤋
ok properly there's an excellent distinction between 55w and 10w. yet i'm guessing your searching for a 3hr era for emergency evacuation. so none of them are any stable the 10w and the 55w of a 6volt furnish might die in the hour. nevertheless the 10w will possibly no longer provide you the lux ranges you desire. Sorry nevertheless mate, if i'm incorrect as Ive only are available in from the pub.
2016-10-17 00:29:14 · answer #6 · answered by ? 3 · 0⤊ 0⤋
The light is going to dim as you use it anyway, so you will turn it off before the battery is completely flat anyway..
2007-11-16 11:07:49 · answer #7 · answered by compyshop 3 · 0⤊ 2⤋