--- title: "UPS Runtime Calculator Kenya: Battery Hours and UPS Size | Qyvea" url: https://qyvea.co.ke/ups-runtime-calculator-kenya description: "Free UPS calculator: enter your load in watts and battery size to get backup runtime, or the UPS VA rating you need for a PC, router, CCTV or POS." updated: 2026-10-17 --- > Markdown copy of https://qyvea.co.ke/ups-runtime-calculator-kenya for AI assistants. Prices and stock change; check the live page. We deliver products across Kenya · same-day dispatch · delivered within 24 hours[CCTV Installation](https://qyvea.co.ke/cctv)[Access Control](https://qyvea.co.ke/access-control-systems-kenya)[Biometrics & Attendance](https://qyvea.co.ke/biometrics)[Electric Fencing](https://qyvea.co.ke/electric-fence)[Automatic Gates](https://qyvea.co.ke/automatic-gates)[Fire Alarm Systems](https://qyvea.co.ke/fire-alarm-systems)[Security Guards & K9](https://qyvea.co.ke/security-guards)[Solar Installation](https://qyvea.co.ke/solar-installation)[Solar & Power Backup](https://qyvea.co.ke/solar-solutions)[Electrical Installation](https://qyvea.co.ke/electrical-installation)[Smart Home Automation](https://qyvea.co.ke/smart-home-automation)[Building Management (BMS)](https://qyvea.co.ke/bms)[Networking & Wi-Fi](https://qyvea.co.ke/networking)[IT Support](https://qyvea.co.ke/it-support)[Cyber Security](https://qyvea.co.ke/cybersecurity)[System Integration](https://qyvea.co.ke/system-integration)[Intercom Systems](https://qyvea.co.ke/intercom)[PA Systems](https://qyvea.co.ke/pa-systems)[POS Systems](https://qyvea.co.ke/pos-systems)[Queue Management](https://qyvea.co.ke/queue-management-systems)[Business Supply (B2B)](https://qyvea.co.ke/business-supply-kenya)[Maintenance & Repairs](https://qyvea.co.ke/maintenance) Free tool · Calculator # UPS Runtime and Size Calculator Find out how long a battery will run your equipment through a power cut, and what UPS size to buy. Total load (watts) Battery voltage (V) Battery capacity (Ah) Battery type Inverter efficiency (%) Enter your numbers above. ## How it is calculated Runtime (hours) = battery voltage x Ah x usable fraction x inverter efficiency / load watts. UPS size (VA) = load watts / 0.7 power factor x 1.25 headroom. Lead-acid batteries should not be discharged below about 50% for a long life; lithium LiFePO4 allows about 80%. Results are estimates for planning. Real systems depend on site conditions; Qyvea surveys and quotes before installation. ## Tips from our installers - Add up every device on the UPS: PC, router, switch, CCTV recorder, printers. - Never put heavy motors or laser printers on a small UPS. - Battery runtime falls with age: expect 70 to 80% of the figure after 2 to 3 years. ## Frequently asked questions How long will a 650VA UPS run a router? A router uses 10 to 20 W, so a small UPS can run it for hours; use the calculator with the UPS battery size. Is lithium worth the extra cost? It lasts several times more cycles and gives more usable energy per Ah, so it often wins over 3 to 5 years. Can I add more batteries? Only on UPS models built for external batteries; check the manual. ## Related - [UPS and power backup in the store](https://qyvea.co.ke/products?search=ups) - [Solar and power backup solutions](https://qyvea.co.ke/solar-solutions) - [Best UPS for Wi-Fi router and POS](https://qyvea.co.ke/best-ups-for-wifi-router-and-pos-kenya) - [All Qyvea calculators](https://qyvea.co.ke/calculators-kenya) Need it supplied and delivered? [Send us the result on WhatsApp](https://wa.me/254113301244?text=Hi%20Qyvea%2C%20I%20used%20the%20UPS%20Runtime%20Calculator%20and%20need%20a%20quote). We deliver across Kenya. Chat with us — 30 min response --- **Qyvea Limited** · Westlands, Nairobi, Kenya (delivery only, no walk-in pickup) · serving all 47 counties Phone/WhatsApp: [+254 113 301 244](https://wa.me/254113301244) · Email: info@qyvea.co.ke · Shop: [qyvea.co.ke/products](https://qyvea.co.ke/products) · Facts: [qyvea.co.ke/qyvea-facts](https://qyvea.co.ke/qyvea-facts)