915iS Current Availability

by Micheal Fletcher in 915iS Technical Questions 6 years ago

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Re: 915iS Current Availability

by Bill Hertzel » 6 years ago

Bill Hertzel

13 1.95k 7.96k

The ECM does not report the Generator current, only the voltage.
An external shunt, usually on the Battery lead, Not the Generator, would be needed.
You do not really care what the generator is doing as long as the battery is not being depleted.

If you were to "Attempt" to draw more than ~30 amps, before the fuse blew, the voltage would sag.

The Generator is really a 420 Watt power source.
The average mechanic thinks he understands Volts and Amps but many get glassy-eyed when the "Watt" word gets used.
The regulator on the generator limits the voltage at 14.2 volts nominally. So the generator is considered to be a 30 Amp generator nominally.
420 Watts is 14 volts and 30 Amps. 14 x 30 = 420

420 Watts is also 12 volts at 35 Amps. 12 x 35 = 420
So if you drew 35 amps for a short period, the generator voltage would sag and match the battery voltage.
At somewhere around 13 volts (A Reasonable Guess) The battery would show a discharge and supply the missing power.

A typical modern 10Watt Output aviation radio draws well less than 3 Amps when transmitting. <25 Watts Input.
That leaves you with over 25 amps (350 Watts) for your lights.
In this day of LED lighting, That is a tremendous amount of light!
Most people never come anywhere near needing the whole 30 amps under any condition.

What are you really trying to Power?
A Midnight-Sun Police type Spotlight comes to mind.

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.

Thank you said by: Micheal Fletcher

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Re: 915iS Current Availability

by Glenn Martin » 6 years ago

Glenn Martin

3 281 793

That is why you have a battery in the system.

Your Battery can supply probably up to 160 Amps in addition to the generator. It does this when you hit the starter button.

There is nothing wrong with using more than 30 amps for a small time but as Bill says I struggle to see how you could ever do this.

Thank you said by: Micheal Fletcher

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