I had a Onan 5500 watt with my old Cyclone 3250 and it was sufficient to run about anything you could load on it. Very good quality unit but costly. My new Carriage Cameo 36fws did not have a gen so I purchased a Champion 3500/4000 watt gen. You could run both ac units but not anything much else. I went through and made up a chart of all my appliances loads (wh, tvs, bat charger, etc. etc. and wrote down their amp loads and then from that chart I can see what I can and can't run at the same time. All appliances have a wattage or amp rating. Here are conversion charts to do your wattage and amperage conversions.
Converting Watts to Amps
The conversion of Watts to Amps at fixed voltage is governed by the equation Amps = Watts/Volts
For example 12 watts/12 volts = 1 amp
Converting Amps to Watts
The conversion of Amps to Watts at fixed voltage is governed by the equation Watts = Amps x Volts
For example 1 amp * 110 volts = 110 watts
Converting Watts to Volts
The conversion of Watts to Volts at fixed amperage is governed by the equation Volts = Watts/Amps
For example 100 watts/10 amps = 10 volts
Converting Volts to Watts
The conversion of Volts to Watts at fixed amperage is governed by the equation Watts = Amps x Volts
For example 1.5 amps * 12 volts = 18 watts
Converting Volts to Amps at fixed wattage
The conversion of Volts to Amps if the wattage is known is governed by the equations Amps = Watts/Volts
For example 120 watts/110 volts = 1.09 amps
Converting Amps to Volts at fixed wattage
The conversion of Amps to Volts if the wattage is know is governed by the equation Volts = Watts/Amps
For Example, 48 watts / 12 Amps = 4 Volts
Converting Volts to Amps at a fixed resistance
If you know the volts and the load of the resistance the amps are found by Ohm's law: Amps = Volts / Resistance
Converting Amps to Volts at fixed resistance
If you know the amps and the resistance Ohm's law becomes Volts = Amps * Resistance
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Explanation[/SIZE]
Amps are how many electrons flow past a certain point per second. It is equal to one coulomb of charge per second, or 6.24 x 10^18 electrons per second. Volts is a measure of how much force that each electron is under, which we call "potential". Power (watts) is volts times amps. A few electrons under a lot of potential can supply a lot of power, or a lot of electrons at a low potential can supply the same power. Think of water in a hose. A gallon a minute (think amps) just dribbles out if it is under low pressure (think low voltage). But if you restrict the end of the hose, letting the pressure build up, the water can have more power (like watts), even though it is still only one gallon a minute. In fact the power can grow enormous as the pressure builds, to the point that a water knife can cut a sheet of glass. In the same manner as the voltage is increased a small amount of current can turn into a lot of watts.
This is also why increasing the volts does not necessarily increase the available power. Power is amps times volts, so if you double the volts you halve the amps unless something in your circuit actually creates power, such as a battery, solar panel or nuclear power plant.
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