battery run time calculation help

[engr.waqas]

battery calculation

How can i calculate mathematically how much time my inverter battery will run provided that i know the readings of voltage and current sensor attached to battery.
i want something like estimated time left for battery calculation.

 

[kender]

battery run time calculate

About the only reliable way to estimate the remaining run time of the battery is to:
- Discharge the battery.
- Measure and integrate the current into the battery, when charging.
- Apply the coulometric charging efficiency factor. For example, for NiMH batteries it's around 66%, which means that 150Ah needs to go into the battery to get 100Ah back.
- Measure and integrate the current out of the battery.

 

[twidlerjohn]

time calculation of battery

If the load is constant, you can use the battery manufacturer's discharge curves and calibrate for the current.