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The usual Watts/Volts = Amps still applies, but the volts are 12.
Therefore:
65 / 12 = 5.4 amps.
Then allow a bit for inverter inefficiency - say it's 85% efficient (but a good one might be 90%, a cheapo only 80%) so divide 5.4 by 0.85 and you get 6.3 amps.
The 150W is the maximum power that the inverter can deliver (ignoring surge capability) so the actual load of 65W applies in the calculation.
The usual Watts/Volts = Amps still applies, but the volts are 12.
Therefore:
65 / 12 = 5.4 amps.
Then allow a bit for inverter inefficiency - say it's 85% efficient (but a good one might be 90%, a cheapo only 80%) so divide 5.4 by 0.85 and you get 6.3 amps.
The 150W is the maximum power that the inverter can deliver (ignoring surge capability) so the actual load of 65W applies in the calculation.
Why not just use a 12v adapter directly into the laptop?
Because It costs £31 for my laptop as it has an unusual power connector which is not included in any of the universal ones. Then I have to get another for my wifes laptop at about £16 - but I already have the inverter. Just trying to save some cash.
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