150 watts is the max output of the inverter .
You may not be using as much as that .
Find the output of your alternator ,subtract the wattage of the bulbs, then take a bit more off for the ignition loss and the losses involved with the inverter .What you have left is what is available for the inverter output.
Check the draw of the apparatus you want to power - and Bob's your uncle !
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Blessed are the cracked, for they let in the light. - Spike Milligan
"When you come to a fork in the road ,take it ! When you come to a spoon in the road ,take that also ."
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