ENGINEERING TOOLS

Battery Runtime Calculator

Estimate Your Backup Runtime

Calculate exactly how long your custom lithium battery banks can power your critical appliances during extended outages, and determine your ideal storage capacity.

SYSTEM SIZING

Inverter Battery Calculator

Battery Specifications

Battery Bank Voltage

Battery Capacity per unit (Ah)

Number of Batteries in Bank

Continuous Appliance Load (Watts)

Inverter Efficiency (Losses)

Efficiency Target: 95%

Estimated Backup Runtime
0 Hours

Extended Format

0d : 0h : 0m

Total Storage Size

0 kWh

Usable Power (Accounting for DoD & Losses)

0 kWh

QUICK REFERENCE

Common Load Profiles

Home Entertainment

~150W Load
(TV, Decoder, Internet, Lights)

Deep Freezer

~300W Load
(Compressor active cycles)

Home Office

~500W Load
(Laptops, Monitors, Fans, Router)

Server Room

~1500W+ Load
(Racks, Networking, Cooling)

THE ENGINEERING BEHIND IT

Understanding Battery Runtime

Voltage & Amp-Hours (Ah)

These two metrics define your total energy pool. Multiplying your battery bank's Voltage by its Amp-Hours (Ah) gives you Watt-Hours (Wh), which represents your true physical storage capacity.

Depth of Discharge (DoD)

You can never use 100% of a battery without damaging it. Premium Lithium (LiFePO4) allows an 80%-90% DoD, while older Lead-Acid batteries only allow a 50% DoD before risking cell damage.

Inverter Losses

Inverters use energy to convert DC battery power into the AC power your appliances need. A high-efficiency Kowatek inverter retains up to 95% of your power, ensuring minimal energy waste.

COMMON QUESTIONS

Runtime & Sizing FAQs

How long do lithium batteries last?

Structurally, Kowatek's Lithium Iron Phosphate (LiFePO4) banks are designed to handle 4,000 to 6,000 deep discharge cycles, which translates to a lifespan of 10+ years under proper smart management.

Can batteries power heavy AC units?

Yes. However, Air Conditioners create massive inductive loads. Powering them requires a specifically scaled high-voltage lithium bank (48V+) and a heavy-duty inverter to handle the compressor surge without failing.

What causes actual runtime to fluctuate?

Runtime is dynamic. It drops if you plug in a heavy appliance (like a microwave or iron) and increases when heavy appliances cycle off (like a fridge compressor turning off once cold).

What is the difference between Ah and kWh?

Ah (Amp-hours) is a measure of charge, but without knowing the voltage, it is incomplete. kWh (Kilowatt-hours) is a true measure of total energy volume (Voltage x Ah), making it the most accurate metric for sizing.