Calculator for battery run time for Lead Acids batteries

This is a simplified run time battery calculator or estimation on capacity for Lead acid batteries. It is using the Peukert's law. In essence this calculator is using Peukert's constant k=1.2 (as be best valie is around 1.1 and the worst 1.3). I'm not taking in the account Lead Acid battery need to stay above 10% of i't rated capacity and assuming we are draining battery to 0. You need to know: a. Time needed to run your loads in hours;  b. Load currents in Amps.

Run time for lead acid batteries I (load current), (A)
Battery capacity C, (Ah)

0 hr


So if you have for example 120Ah, 24V battery on your ship and 5 KWatt motor. That is according to definition of Power P=IxV  is 420A. If you use this battery run time calculator, it would give you only 0.0786hr or 0.079x60= 4.75 minutes and your battery is completely drained.

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