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Hi Stefan, The number of amps is irrelevant to low current users like us, it is just the number of amps that the unit can put out at a given moment for high current usage such as car starter motors.
What matters is the number of ampere/hours, which is analogous to how
much petrol a tank holds, the bigger the tank the further it will drive the car. A 900 amp unit is usually around 17amp/hrs, meaning that it will supply 1 amp for 17hrs, or 2 amps for 8.5 hrs etc: The amount of petrol in the tank does not matter much for jump starters, as they are designed for high current output for as long as it takes the engine to start. In light of this the amp/hr rating doesn't increase a lot as the max current rises.
An 1100amp unit usually has a rating of 19amp/hrs, a1300 amp unit
21amp/hrs, and so on. A small car battery will give far more bang for your buck; for instance a 350 cranking amps car battery will give at least 60amp/hrs,[depending on model and price] and can be got from Repco for about $95.
raymo
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