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...

How to block ads on your network using Pi-Hole and a Raspberry Pi
How to block ads on your network using Pi-Hole and a Raspberry Pi

With Pi-Hole you can block in-app advertisements. Network-level blocking allows you to block ads in non-traditional places such as mobile apps and smart TVs, regardless of your hardware or OS and since advertisements are blocked before they are downloaded, network performance is improved and will feel faster. Pi-hole is a black hole for Internet advertisements.

Read The Article
How To Use Your Raspberry Pi To Monitor Internet Speed
How To Use Your Raspberry Pi To Monitor Internet Speed

Testing speed on a regular basis allows you to pinpoint performance trends, isolate which devices may be causing issues for your wireless network, and ensure no one is stealing your bandwidth. This tutorial is made for you if you’re interested in monitoring how your download speed, upload speed, and ping are affected over time. In order […]

Read The Article
A smart bulb that works with the eWelink app
A smart bulb that works with the eWelink app

The Sonoff lightbulbs are very affordable and provide you with the basic functionality that a smart home needs. If the budget is tight and you don’t need all bells and whistles of the more expensive lights, Sonoff lightbulbs will do the job just fine. The prices start from $9.90 for the (plastic, White + color temperature) B02 B A60 and $12.90 for the fancy, pear-shaped B02-F-ST64 (glass, retro look, White + color temperature). As far as connected lights go, the prices are very attractive and Sonoff lightbulbs indeed are as inexpensive as you can get.

Read The Article