FollowupID: 8703 Submitted:
Tuesday, Mar 04, 2003 at 23:14
Rob posted:
A 70 AH battery - should deliver a current of 1 amp for 70 hours.
Or, in theory, 70 amps for 1 hour - but unlikely, unless it is designed for this.
Assuming a 100% efficient battery, charging for 70 hours at 1 amp
would then allow 70 hours discharge at 1 amp.
Unfortunately, batteries are not 100% efficent e.g. they will get warm during charge. Thus you would have to charge for longer than 70 hours (at 1 amp) to replace the charge you had taken out of it.
Typically, a lead-acid battery is around 70% efficient meaning you would have to put around 42% 'extra' charge into a battery.
Rob