Battery Jump start Packs.
Hi Elliejane,
I can see your logic in your research into
battery jump start packs if your vehicle
battery is being drained, possibly by your vehicle alarm system, or just a tired old vehicle
battery, but before you lash out money, take a look at, '
Victron Cyrix 12/24V-120A Intelligent
Battery Combiner*', these are intelligent split charge relays allowing excess 12v charge to flow from a topped up and charging leisure
battery set (on mains hook up), to the vehicle
battery or, from a topped up and charging vehicle
battery to your leisure
battery set. they incorporate a 30 second emergency
battery paralleling function. These are marine quality, and can handle either12v x 120 amps* or 240 amps or 400 amps current flow. I've fitted the 120 amp version and cabling, its proved reliable and not fried itself ..
Factor in the cost of a high current 120amp fusible link and housing or circuit breaker and sufficient length of high current / nominal 150amp vehicle cable, and terminals, (Vehicle Wiring Products Ltd) and if your not confident DIY wiring in, an auto electricians time to fit.
Hope this helps.
Rob H.