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Which only illustrates once more that a really good battery is a necessity for starting up a tractor. Just to make a comparison: Power (in Watt) = voltage (in Volt) * current (in Ampere) = 12 V * 450 A = 5.400 Watt = 5.4 kW. In Europe, domestic home voltages are 220 V. If I were to require a power of 5.400 Watt the current would have to be: current = power / voltage = 5.400 / 220 = 25 A. That kind of current would blow the fuses, as most household fuses are 10 Amperes, and some (on groups with dishwashers and other consuming appliances on it) are 16 Amperes. If the fuses would NOT blow, the electrical wires would heat up as a result of the high current passing through, and the house would more than likely burn down. If it takes 10 seconds before the engine starts, the electric energy consumed will be: Energy (in Joules) = Power (in Watt) * time (in seconds) = 5.400 W * 10 s = 54.000 Joule It would take a regular 100 Watt lightbulb about 10 minutes to consume the same amount of energy, i.e. 50 times longer! A tractor battery is a marvel in that it can deliver such enormous currents and power. (all calculations based on a domestic voltage of 220V, as in Europe)
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