About this tool
Estimate an inverter and battery scenario from the entered appliance loads and backup period. Review conversion and usable-capacity assumptions before comparing the result with manufacturer specifications and installation advice.
Calculations and file processing run in this browser tab. The tool does not send working inputs or files to our hosting server.
मुख्य इनपुट और नियंत्रण हिंदी में देखने के लिए ऊपर “🇮🇳 हिंदी में देखें” चुनें। गणना और फ़ाइल प्रोसेसिंग इसी ब्राउज़र टैब में होती है; टूल आपके इनपुट हमारी होस्टिंग पर नहीं भेजता।
Features
- Work with Total Running Load During Power Cut (Watts — e.g., 3 Fans + 4 LEDs + Wi-Fi = 280W); Desired Backup Time (Hours).
- Battery System Voltage (V): choose from 12V (Single Tubular Battery — Standard Home); 24V (Double Battery System).
- Review Continuous Load; Minimum Inverter VA; Calculated Battery (12V) in the result breakdown.
Benefits
- Keep power-load and backup-duration assumptions distinct.
- Compare battery-capacity scenarios before requesting a quotation.
Who should use this tool?
- Households researching power backup.
- People preparing an appliance-load worksheet.
How to use
- Complete the labelled fields for your scenario, including Total Running Load During Power Cut (Watts — e.g., 3 Fans + 4 LEDs + Wi-Fi = 280W); Desired Backup Time (Hours). Use the units shown beside each field.
- Choose Battery System Voltage (V) to match the situation you want to check.
- Select Calculate / Run Tool and review Recommended Battery (Ah) & Inverter (VA) and Continuous Load; Minimum Inverter VA.
- Check the assumptions and limitations below. Adjust a value to compare scenarios, then copy or download the result you need.
Try these worked examples
| Scenario | Example inputs | Example result |
|---|---|---|
| 300W Home Load for 4 Hours on 12V Single Battery (150Ah) | Total Running Load During Power Cut (Watts — e.g., 3 Fans + 4 LEDs + Wi-Fi = 280W): 300Desired Backup Time (Hours): 4Battery System Voltage (V): 12V (Single Tubular Battery — Standard Home) | 150 Ah Tall Tubular Battery (125 Ah min) + 800 VA Pure Sine Wave Inverter |
| 500W Office Load for 5 Hours on 24V Dual Battery | Total Running Load During Power Cut (Watts — e.g., 3 Fans + 4 LEDs + Wi-Fi = 280W): 500Desired Backup Time (Hours): 5Battery System Voltage (V): 24V (Double Battery System) | 150 Ah Tall Tubular Battery (131 Ah min) + 800 VA Pure Sine Wave Inverter |
Reference and processing
Standard DC Battery Discharge Formula Ah = (Watts × Backup Hours) / (Battery Volts × 0.8 Efficiency) · Listed applicability: 2025-2026
Calculations and file processing run in this browser tab. The tool does not send working inputs or files to our hosting server.
FAQs
Does this replace a professional installation check?
The worksheet does not assess wiring, surge demand, protective devices or a specific battery’s condition. Use manufacturer guidance and qualified installation advice for an actual system.
Which inputs do I need for Home Inverter VA & Tubular Battery Capacity (Ah) Backup Calculator?
Use Total Running Load During Power Cut (Watts — e.g., 3 Fans + 4 LEDs + Wi-Fi = 280W); Desired Backup Time (Hours); Battery System Voltage (V). The built-in examples show how those fields fit together.
What should I check before using this result?
Includes 80% inverter conversion efficiency and 80% safe depth-of-discharge (DoD) factor for lead-acid tubular batteries. Check the assumptions and output against your intended task before relying on the result.
What happens to the information I enter?
Calculations and file processing run in this browser tab. The tool does not send working inputs or files to our hosting server. Tool favourites save only tool IDs in this browser. Sharing sends the tool link, not your working values or files.