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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for �200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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