Re: Low Voltage Disconnect
Wattage rating on an inverter is its maximum output (excluding momentary surge rating). You can't get 1000 Watts out of a 150 Watt inverter; it will shut down.
Likewise it will not supply 300 Watts for your computer, although you may find that it will run it: the Wattage rating of a power supply is again its peak output, not its average consumption. I have measured desktop computer consumption and found it tends to be under 200 Watts. It varies too; might be 90 or 190 depending on what the computer is doing.
If your going to try and figure out what will run on any given inverter, invest $30 in a Kill-A-Watt meter and measure the device's actual use. Then you'll have a much better idea how much power you need to run it with.
Also, be advised there are two different types of inverter: the "pure" sine wave and the "modified" sine wave (both technically misnomers). Something that draws 'X' Watts on a pure sine wave inverter may draw more power on a modified sine wave. This is the Power Factor issue, and the K-A-W will give you a PF number as well. Some things, like induction motors, do not run on MSW inverters at all. There again, it depends on the particular motor and the particular inverter.
1220 Watts of PV, OB MX60, 232 Amp hrs, OB 3524, Honda eu2000.
Ohm's Law: Amps = Volts / Ohms
Power Formula: Watts = Volts * Amps