I have just loaded the van with all my gadgets(notebook/phone/satnav/carcam etc ) all low power stuff plus all the 12v chargers.What size inverter would I need to charge them as dont intend to use any item more powerful than listed? I have a 600 cheap inverter already but would this use more out of the LB "s than say a 150 /300 inverter for charging same item?