Inverter & Battery Calculator
Calculate suggested inverter VA and recommended battery AH from appliance loads, housing presets, and backup duration. Supports India, US, and EU quick-start configurations.
Total Load
340W
Suggested
850VA
Backup
4.5 Hrs
Recommended Battery
150 AH (12V)
System Setup
Region, housing preset, and backup settings
Region
Quick Presets
Appliance Management
Configure your load requirements
LED Bulb
Standard energy-efficient lighting
Ceiling Fan
Standard 48-inch ceiling fan
LED TV
32–43 inch LED television
Wi-Fi Router
Home internet router
Laptop Charger
Laptop power adapter
Methodology and limitations
Last reviewed:
Methodology
Sums appliance wattage by quantity, applies power factor and safety margin for inverter VA, and divides energy demand by battery voltage and efficiency for AH. Results round up to standard market sizes.
Limitations
Motor startup surge, cable losses, battery aging, and temperature can affect real-world performance. Consult an installer for final sizing.
How to Use the Inverter & Battery Calculator
Calculate suggested inverter VA and recommended battery AH from appliance loads, housing presets, and backup duration. Supports India, US, and EU quick-start configurations.
Frequently Asked Questions
Add the wattage of all appliances running at the same time, divide by the power factor (typically 0.8 for mixed household loads), and apply a safety margin. The calculator rounds up to standard inverter sizes such as 600, 850, or 1000 VA.
Multiply total load in watts by desired backup hours, then divide by battery voltage and inverter efficiency. For conservative sizing, enable depth-of-discharge in advanced settings.
Watts measure real power consumed by appliances. VA (volt-amperes) is the apparent power an inverter must supply. Motors and inductive loads draw more VA than watts, so inverters are rated in VA.
12V systems are common for small homes and apartments. 24V and 48V suit larger loads because they reduce current and cable losses. Match your battery bank voltage to your inverter rating.
These are India-style housing presets (1, 2, or 3 bedroom-hall-kitchen units) that pre-fill typical appliance loads. US and EU presets use bedroom-based labels with region-appropriate wattages.
Yes. Refrigerators, air conditioners, and pumps can draw 2–3× their running watts at startup. Choose an inverter with adequate surge capacity beyond the steady-state VA shown here.