Four 100 watt light bulbs or anything else that sums to 400 watts.
The inverter should supply at least 1 kW and if it is for extended use more than 4-5 minutes it should supply 1.5 kW.
run what one takes more power????
One would assume the chainsaw requires 120 volts or more if you want to run it with an inverter. If your chainsaw uses 16 amps at 120 volts then your wattage is Volts (120) x Amps (16) and that would be 1920 watts. So you will require a much larger inverter to run your chainsaw.
A 300 watt audio system means it has a peak power of 300 watts but the average power might be only a fraction of that, perhaps 5-10 watts. So it might run off a car battery, with an inverter to supply the correct voltage if needed. <<>> A 300 watt public address sound system will operate very nicely from as small as a 500 watt AC generator. A 1000 watt generator will give you more capacity if there are other devices that need powering.
we can use 12 no's
A 1,000 watt inverter giving 110 volts is rated at 9 amps.
Most likely yes depending on your inverter and how long you run it. I have done it once before. I ran a sub woofer and a PA horn in my dad's work van for fun. Ran it for about a half hour. It was a 1000 watt inverter on a 700cca battery. The amplifier was bridged to 150 watts RMS. If you run more power you might need a bigger inverter. Out inverter also has circuitry that filters out noise.
Four 100 watt light bulbs or anything else that sums to 400 watts.
The inverter should supply at least 1 kW and if it is for extended use more than 4-5 minutes it should supply 1.5 kW.
no
No. The 12volts will not make a difference. The inverter converts the 12volts to 110/115volts. A 400watt inverter is not sufficient to run a power saw or any heavy power equipment like that. Laptops consume 20-50watts, while a coffee pot would consume more like 200-400watts. Your power equipment is a much heavier load, between 1000-4000watts depending on if it is a power saw or something larger. A basic 7 1/4 circular saw will use anywhere from 1000-2500 watts on starting and will draw a constant 800-1500 watts. Keep in mind it will draw more as you put it under load of cutting something, this will not run on a 400 watt inverter, let alone an 800 or 1000watt. You could however possibly run a power drill on that inverter, but otherwise no luck.
2/12volts batteries
The formula for watts (or power) is Amps times voltage. Therefore with a 6 amp draw times 120 volts would be about 720 watts. A 1000 watt power inverter would do the job.
http://wiki.answers.com/Q/How_many_solar_panels_and_batteries_do_you_need_to_run_a_5000_watt_inverter"
Yes, provided the power inverter has a high enough power rating (wattage) for the CPAP device.
It depends on the source of DC that is powering the inverter. Since the inverter is 2000 watts, that just means it will handle your 1500 watt application. At 120 VAC you are drawing a little over 12 Amps. If this is an inverter plugged into a car it will run until the battery runs down, whose time will be lengthened if you keep the car running. Your battery will have an Ampere per Hour rating. If for example you had a 50 AHr battery it could supply 50 Amps for an Hour so your heater would run for about 4 hours.