2 ms·
First of all, your calculation is completely wrong. 400W * 8h would be 3,2kWh which is a lot less than 2000W * 24h = 48kWh per day that is advocated here. Seco
by Tepix 4y ago
First of all, your calculation is completely wrong. 400W * 8h would be 3,2kWh which is a lot less than 2000W * 24h = 48kWh per day that is advocated here.
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.
- ginko 4y agoIt's shocking how hard of a time people have distinguishing watts from watt hours. Even in a forum aimed at technical people.
- Bud 4y agoNot that shocking. About half of American society was unable to figure out why masks and social distancing were helpful during a pandemic.
- dredmorbius 4y agoI 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.