Battery Power
Submitted: Thursday, May 08, 2008 at 10:37
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Jethro T
Hi Guys,
Can anyone tell me if my electrical calculations are correct.
I have a sleep apnea machine which _Affordable_Storage_Drawers.aspx 1amp at 240v does this mean it will draw 20amps at 12 volts using up a 160 AH battery in 8 hours.
It seems like a lot of power for a little motor.
(I realise I will lose 10% through the inverter and that I will need a 200AH battery to have 160AH on tap).
Thanks
Reply By: Member - Serg (VIC) - Thursday, May 08, 2008 at 10:46
Thursday, May 08, 2008 at 10:46
Hi Jethro,
I bet that your apnea machine does not operate at 240V internally, but rather on some kind of DC voltage. So getting DC-DC converter in this case will be way more efficient. Your calculations correct for passive load (like tungsten bulb, iron or heater), but can be very deceptive with inductive one like motors. The best way is to hook-up inverter and measure amps directly.
Cheers
Serg
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