Hey guys, have you ever stood in the square and stared at the two-story LED screen and thought about it - where did this big guy steal the electricity from? It can't be that a household power strip has been ripped out, right? Today we will discuss this matter in detail, and I guarantee that you will slap your thighs after listening to it!

1. Three major schools of power supply methods

​​The power source of large outdoor screens is actually more important than you think.​ ​, mainly divided into these three categories:

• ​​Municipal power grid direct supply​ ​: Just like connecting a refrigerator to a socket at home, but using 380V industrial electricity (ordinary sockets are only 220V)
• ​​Wind and solar hybrid system​ ​: Install solar panels on the top of the head and set up a small windmill next to it. It can save electricity on sunny days and windy days.
• ​​Energy storage battery pack​ ​: Extra large power bank, specially designed to deal with power outages or temporary activities

Last year, during an event in a business district, the screen using energy storage batteries lasted for 18 hours, saving 60% of the cost compared to using a diesel generator. But having said that, the current mainstream solution is to connect to the municipal power grid. After all, no one wants to have the screen suddenly go black during an advertisement, right?

2. Disclosure of power saving secrets

​​Do you think it consumes electricity when the screen is on? Today’s technology is terrible​ ​：

1. ​​Intelligent brightness adjustment​ ​: Automatically increases the nits to 7500 nits (similar to car high beams) on sunny days, and drops to 4000 nits on cloudy days
2. ​​Zoned power supply technology​ ​: Power is cut off directly where there is no image, saving 35% of power compared to old-fashioned screens
3. ​​Low power driver chip​ ​: The new chip can make the electricity meter run slower, just like the power saving mode of mobile phones.

For example, after using the new screens installed in a pedestrian street, the monthly electricity bill was directly reduced from 23,000 to 14,000. The master told me that the money saved is enough to give the cleaning lady a half-year bonus!

3. Things about buried cables

​​See those manhole covers at the bottom of the screen? ​ ​ There is a great question hidden underneath:

• ​​Special cable trench​ ​: Dig 1.2 meters deep and bury galvanized steel pipes to prevent rats from gnawing and rust.
• ​​Dual circuit power supply​ ​: It’s like installing two power banks for your mobile phone. If one of the batteries breaks, you still have a spare.
• ​​Lightning protection grounding system​ ​: Drilling a 6-meter-deep grounding pile is as stable as an old dog during thunderstorms

There was a heavy rain last month and the transformer at the entrance of our community burned out, but the big screen still showed advertisements for hot pot restaurants. Later I learned that their power supply system has three levels of protection, which is more reliable than my router’s lightning protection!

4. Guess the future trends

Let me tell you, the most exciting thing right now is​ ​Wind, solar and storage integration​ ​design. I saw a pilot project two days ago. Photovoltaic panels are installed on the top of the screen and miniature wind turbines are stuffed in the frame. It can generate electricity even on sunny days or windy days. What's even more amazing is that there is a battery hidden in the stand, which can last for 8 hours on cloudy days.

However, we have to pour cold water on them because the cost of these new technologies is still high. If ordinary merchants don't have enough budget, it's most cost-effective to simply connect to municipal electricity. After all, no matter how expensive the electricity bill is, it is better than keeping the screen black. Do you think this is true?

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