Welcome to our free, battery and DC power system sizing calculator. This calculator uses the IEEE 485 recommended practice for sizing lead-acid batteries for standby DC power systems. It also calculates the minimum size of charger needed to run your loads and simultaneously recharge the battery. Using real systems data provided to us by global manufacturers of high-quality industrial power systems, the calculator emails results to you (and a copy to us - we won't hassle you unless you ask us to) containing details and the estimated landed-cost of the optimum system to support your loads.
All results are calculated using the IEEE485 recommended practice for sizing lead-acid batteries for stationary applications and real systems data supplied by some of the worlds leading DC system manufacturers.