Some of the commercial equipment I use is here. Usually it is vastly cheaper than my time and money even if I can make it up myself.
“Continue reading” for more equipment information.

Above: The rear view of the 12 volt battery which can jump start a car and provide 12 volt cigarette socket outputs. There is a compressor and 400 W, 240 Volt inverter as well. About AU $170 from memory. I use a proper automatic charger rather than their fixed level charger as it is too easy to damage the battery. I need an under voltage cutout as it would be easy to leave this on resulting in a flat battery and reduced life of the battery.

On the right is a messy thing attached to the car battery that has done me well for many years but is time for retirement.

Photo date 15/02/12