It's shocking how hard of a time people have distinguishing watts from watt hours. Even in a forum aimed at technical people.
Re:2000-Watt Society
by dredmorbius on Tuesday September 20, 2022 @09:42PM
(#32920012)
I like to use the analogy of fuel tank capacity (kWh) vs. engine output --- horsepower for Americans and most Brits (kW).
Power is a flow, it's the rate of energy usage (or output) over time. More power means higher top speed, or stronger acceleration, or hill-climbing ability, or towing capacity.
Energy is a stock, it's a total quantity of potential. A bigger fuel tank won't make your car any faster, but it will determine how much range you have.
Since appliances, equipment, generators, etc., consume or produce watts of power, it's handy to consider how much energy this represents by simply multiplying watts by time, by default, hours.
Second, the Macbook Pro which i use 8 hours a day has a 140W power supply but I'm sure it uses less than 50W on average.
- 50W * 8h = 0,4kWh
- 2kW * 24h = 48kWh.
The laptop isn't going to be the problem! Heating OTOH uses lots of energy so good insulation is the key.