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The battery is an 18 amp-hour battery.

I want to run a pair of 100w halogen lights as well as a bow and stern nav light. I need them to run for about an hour max.

If I do the math on the lights ( Divide the total number of watts by the system's volts. For example, a 100-watt bulb in a 12-volt system will draw 8.3 amps.

(100w / 12v = 8.3a) ) I'm thinking this would (barely) make it at 16.6 amp/hours.

And that would really leave me no capacity for the running/nav lights which I doubt draw much but they draw something...

Am I doing my math right??

-T