[Kevin]

connect a marching refrigerator

I'm not familiar with the term "marching refrigerator" - what is it?

It is much more efficient to connect your devices directly to 12V rather than going through an inverter. You can buy 12V charging adapters for all sorts of mobile products be it phones, laptops, iPads (maybe?) etc.. All my devices use 12V except for an inductive cooktop, toaster and kettle that I use on extended trips in the ute.

In the Foz I run a 50 litre 12V fridge and a 300W inverter off an aux 100 amp hour battery.

In my ute I run a 110 litre fridge/freezer and a 3000W inverter off 2 x 110 amp hour batteries.

 

[Kevin]

Does anyone know of a work-around so that I have another way to power my laptop

Sure; you do not need an inverter. I have 12V chargers for all my gear, cameras, laptop, torches etc. Just look at the output specs of the laptop charger, plug type and polarity and search for a supplier. Maybe start with a google search "12V charger for xxxx laptop"

 

[Kevin]

I have a 3000 watt invertor in my ute running off 2 x 110 amp hour aux deep cycle batteries from which I powered my house fridge / freezer during a recent power outage. (240VAC down here of course)