100 watt light bulb at 120 volts draws 0.8 amps. This equates to 8 amps at 12 volts, plus something to account for inefficiences in the inverter.
For the sake of argument, lets assume the inverter is 80% efficient, which means it"ll draw 10 amps from the battery with a 100 watt load on the inverter.
A reasonable size gel-cell battery may have something on the order of 10 - 20 amp-hours capacity, which means you could run the inverter with a 100 watt load for 1 to 2 hours. With a 400 watt load, you would be drawing 40 amps from the battery, and it would last somewhere between 15 and 30 minutes.
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Today's Featured Article - Diagnosing Engine Difficulty - Diesel Tractors - by Staff. The following suggestions are listed for your assistance. You can make simple adjustments on your tractor that will improve its operation and save you the time and expense of hiring someone to do it for you. Always make one adjustment at a time, and if the adjustment made does not improve the condition, return to the original setting before proceeding to the next adjustment. Hard Starting Cold air temperatures. Insufficient fuel.
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