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.
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)
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.
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.
Enclosed in the same shell, SNZB-02 Zigbee temperature & Humidity sensor reports back every couple of minutes. The sensor is powered by CR2450 3V battery. The extra capacity means that the sensor will last a really long time. I have a heater connected to eWeLink app and, once I added a hub (absolutely required) this thing has performed well. The heater is controlled within +- 1°C. That's another thing, eWeLink only provides temperature readings in °C with no option for °F. I'm thinking about placing another sensor on the outside of the window so that I can control based on outdoor temperature as well.
Read The ArticleFirst thing to understand is that on the hidden web, you do not know about a website unless that website is shared with you. The dark web’s content on the internet isn’t accessible through traditional browsers or standard browsing technology. Content on the dark web is designed to be hidden from search engines and from casual users – you can’t simply stumble across dark web websites by accident.
Read The ArticleYou probably know the Sonoff brand for smart home electronics like the POW R2 or the Sonoff Basic switches, but they also released a security camera, the Sonoff GK-200MP2-B. I decided to try it out and made an in-depth review so you can make the right decision. Considering this is Sonoff, a well-known brand for robust electronics. I expect a good working, premium product that just works especially since to use the Sonoff GK200MP2-B, you need the eWeLink application which integrates very well with other Sonoff devices.
Read The Article