Inverter question

HINO SG

Adventurer
I have two low-or medium quality inverters. I don't even know what brand they are; one's 1000w and the others' 300 or so. Any thoughts on how much less efficient it is to run the large one with a small load, if at all?
And can anyone make a wild guess as to the losses of using an inverter in the case of my laptop and cellphone charger?
12v adaper for my laptop is over $60, around $30 for my cell charger. Maybe I should just buy an extra deep cycle for $50. If you're familier with my project (HINO box truck), space is not a huge concern and weight is almost irrelavant.
 

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