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arcticarrow(at)gmail.com
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 Posted: Sat Feb 11, 2017 9:01 am Post subject: battery charger vs power supply |
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My aircraft maintenance manual recommends using a power supply when swinging the electric motor powered landing gear because the battery will loose power over time and slow the retraction time hiding problems with the mechanism. What is the difference between a battery charger and a power supply in this application? Will leaving a power supply connected without a load damage the battery or other electronics? What happens if the electrical load is greater than the output of the power supply?
Would appreciate you thoughts!
Bernie Willis
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user9253
Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan
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| Posted: Sat Feb 11, 2017 9:37 am Post subject: Re: battery charger vs power supply |
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The difference is both voltage and current capacity. The battery definitely has a greater current output capacity. The power supply might have a greater initial voltage. But that voltage could drop if the load is too great. If the power supply voltage drops below battery voltage, then the battery will supply the load. If you elect to test the landing gear using battery only, make sure that the battery is fully charged.
A power supply will not damage a battery or electronics provided that the polarity is correct and the voltage is not too high, less than 14.5
Although a battery could be damaged if a charger with a voltage much greater than 13 is left connected for an extended period of time, i.e., more than 24 hours.
Smart chargers are available that automatically reduce the voltage to a maintenance level once the battery is fully charged.
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