Dave, these are for when you are away from home for a Month in a car park. Normally when the car is in use, it needs no charging.
It is also useful if i go out to my new bikes and the battery has discharged. This will start it instantly to go out.
Saves all the old method of jump leads and connecting to a car and the unit will fit in your pocket. It will charge ipads,phones or run inverters in a caravan etc
Just booked 36 nights parking at the port for a reasonable 100 pounds. I was going to get one of the boys to drive there and back but the port parking is very low cost this time. Unlike travel insurance which is over 2000 pounds for the trip abroad with some of the various illnesses i have now. That is a major problem because having Parkinsons disease, i cannot get anyone to insure me. I am going to go uninsured this time.
Booked another sailing for September to Greek islands