Inverter to battery

Hey all,

May have been answered already but can’t find an answer?!? Starting new job on Monday, lorry is a Volvo FM if it makes any difference?

Would like to install an inverter to the battery, is this an easy job? Could someone provide a side by side guide?
300w via hella 24v won’t be enough as want to take my laptop with me and power supply draws 290w!!!

Any advice would be grateful!

TIA

David