Lv 4. Happy. A Watt, the measure of power, is usually calculated using this equation: Watts = Volts x Amps. The 1200 Watt PSU would run at only 41% of its maximum rating. Check the specs, they would have a wattage rating also. Lv 7. If your system is not going to change than the 800 Watt PSu is the better choice. The watt (symbol: W) is a unit of power or radiant flux.In the International System of Units (SI), it is defined as a derived unit of (in SI base units) 1 kg⋅m 2 ⋅s −3 or, equivalently, 1 joule per second.It is used to quantify the rate of energy transfer.The watt is named after James Watt, an … Often these devices are rated more conservatively, typically at a power factor of 0.8 which would be equal to 1600 watts. 2000 * 0.9 = 1800 watts. It’s better to understand some terms to learn what a 2000 watt power inverter can run. Most important are starting and running watts, which are two independent entities which exist in each appliance. However, you can convert amps to watts by the formula, amps x 120 (volts) = watts. A watt-hour (Wh) is a unit of energy; it’s a way to measure the amount of work performed or generated. Or conversely, you can convert watts to amps by the formula, watts/volts (always 120) = amps. Here's a great tool to match speakers to power amps. Mike Edited January 20 by mjrendon Happy customers, one piece of gear at a time! The 800 Watt PSU would run at 62.5% of max rating. A 2000 watt amp would fairly easily toast a 400 watt speaker. 0 0. billrussell42. Remember, peak wattage is like the number at the top of a car’s speedometer. 5 years ago. Xantrex's website shows that there are are both XC Pro 2000 and 3000 watt rated inverters, however, there is also a Freedom XC (non-Pro) rated at 2000 watts which indicates there may be other differences beside the rated capacities. August 25, 2009 @06:41am. Jump to:Understanding the difference between running watts and starting watts Portable generator vs inverter generator Sensitive appliances What can you run on a 2000 watt generator? Starting and running watts. That is still within the normally accepted range, but at the low end. (Attached). While this peak rating may be a big, impressive number — like 1000, 1500, 2000 watts — it’s actually not the most relevant number in the real world. One Watt hour is equal to one Watt of average power flow over an hour. soundking #5; 11 years ago . Understanding each term helps determine if your chosen inverter can run your appliance or not during power outages. Source(s): https://shrink.im/a9IJh. 8 years ago. 2 0. nutter. THE 2000-WATT SOCIETY VISION. If your voltage runs as low as 110 volts as it does in some areas, the amperage drawn could be as high as 18.18 amps. That is a good value. But while wattage is an important consideration, the efficiency of the speaker(s) that are connected to the amplifier are also an important factor in the loudness equation. Va To Watts. Understanding the difference between running watts and starting watts The first thing you need to be aware of is that each generator will have two different power ratings. When it comes to "volume," many musicians only consider the amplifier's power or wattage rating, and in general, more watts does mean "louder." While the ultimate target is one ton of CO2 per person per year, or about 500 watts of non-renewable source energy, the vision of the 2000-Watt Society is to reduce energy demand for global sustainable development and provide sufficient energy for all. Mike A. September 5, 2009 @03:28am. For example, a 1400-watt motor converts to 11.67 amps (1400/120=11.67). This being said, a 2000 watt water heater operating at 120 volts will draw 16.66 amps, 80% of a 20 amp circuit is just 16 amps. 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