Fork me on GitHub

Battery Runtime Calculator
Calculate your battery runtime using Watts

Formula: Volts of the battery x Ah rating of the battery / Watts of the load / The battery’s depth of discharge (DoD) x The efficiency of the inverter

If you have a 100 watts 42" TV and a 12V 7ah battery lying around and a UPS for example, then you can work out the runtime using the calculator below.

Reset Calculator

Additional information about the calculator

The battery’s depth of discharge (DoD: 1.25 = 80% used, 2 = 50% used, 3 = 33.3% used, 5 = 20% used )

The efficiency of the inverter (60% if you are using a UPS, 85% if you are using a good inverter)

How does DoD work

For those new the industry, DOD sounds like it may be a difficult topic to understand, but it's actually simple. For instance, a battery that has been drained 30% has a 30% DOD, and 70% of its capacity remains.

The more frequently a battery is charged and discharged, the shorter its lifespan will be. Discharging a battery entirely, dramatically shortens the useful life of the battery.

Lithium vs Lead Acid

Most modern lithium-ion batteries have DoDs ranging anywhere from 80% to 95% versus their lead acid counterparts can only do 30% to 50%.

Lithium also have thousands of cycles and lead acid has 200 to 400 cycles at best.

Some articles you might also be interested in...

An affordable VPN that also comes with a Geo Blocker
An affordable VPN that also comes with a Geo Blocker

The internet is full of restrictions, censorship, privacy invasions, security breaches, and a host of unwanted entities trafficking in your personal data. Using a VPN is a great first step toward protecting your privacy online. Privacy is fundamental to a well-functioning society because it allows norms, ethics, and laws to be safely discussed and challenged. Without privacy, a free and open society can neither flourish nor exist.

Read The Article
Xiaomi Mijia 1080P 170 Degree Smart IP Camera with AI Human Detection
Xiaomi Mijia 1080P 170 Degree Smart IP Camera with AI Human Detection

I know this review is long, but I wanted to include all the details to help you decide. This smart security camera from Xiaomi had so much going for it, I still believe there a route for Xiaomi to redeem themselves and make this camera available to its full potential by issuing a firmware update to remove the restrictions and allow RTSP access from the Xiaomi camera.

Read The Article
How to monitor the power usage of devices using a Sonoff Pow R2
How to monitor the power usage of devices using a Sonoff Pow R2

Sonoff Pow R2 is a 16A WiFi smart light switch that allows you to remotely manage and control your appliances and monitor your home energy usage. The WiFi light switch works like a power monitor, which allows you to keep track of 99% accurate real-time current, voltage and power on your app.

Read The Article