Battery backup time calculator
Estimate runtime using the standard formula: V × Ah × DoD × 0.85 ÷ load (W). Default depth of discharge is 50% for lead-acid SMF/tubular batteries. For full IPS sizing steps, see How to calculate IPS size.
Interactive IPS & Battery Sizing Calculator
Engineered by TNS Application Engineering Division
1. Select Your Simultaneous Electrical Appliances
Ceiling Fan (Standard 56")
75W each
225 W
3
LED Tube / Bulb
20W each
80 W
4
Smart LED TV (43"-55")
80W each
80 W
1
Wi-Fi Router + ONU
15W each
15 W
1
Desktop PC / Monitor
200W each
0 W
0
Other Equipment (Watts)
CCTV, Aquarium, Sound Bar, etc.
2. Desired Continuous Backup Runtime
Engineering Calculation Output
Total Load
400 Watts
Min. Inverter
625 VA
Battery Bank Requirement12V DC Bus
169 Ah effective capacity
Calculated at 70% Depth of Discharge (DoD) & 85% inverter conversion efficiency.
Recommended System
Kenson LX-0812 (800VA / 12V)
Most popular home IPS for 3 fans, 4 lights & 1 LED TV.
Recommended Battery: 1x 12V 150Ah–200Ah Battery
View Product Specifications Need customized load testing or industrial Single Line Diagrams? Call our Dhaka hotline: +880 1713 034177
Reviewed by Engr. Lemon Mia, TNS Engineering Ltd. — estimates only; site survey recommended for industrial loads.