Lo Volt Light Illuminated With Fully Repaired Battery
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Hello,
I play on PC and purchased the TBM 850 through the MSFS Marketplace. I have been having an issue where no mater what I do the voltmeter shows just under 25 volts and I get the corresponding lo volt light until I start the engine. I can still start it on battery alone and of course using a power cart works too.
I have tried fully repairing the aircraft, turning off all failures, uninstalling and reinstalling, and letting it stream instead of downloading and it doesn't seem to make a difference. Any help is appreciated!
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Hello,
I play on PC and purchased the TBM 850 through the MSFS Marketplace. I have been having an issue where no mater what I do the voltmeter shows just under 25 volts and I get the corresponding lo volt light until I start the engine. I can still start it on battery alone and of course using a power cart works too.
I have tried fully repairing the aircraft, turning off all failures, uninstalling and reinstalling, and letting it stream instead of downloading and it doesn't seem to make a difference. Any help is appreciated!
@flightquay What you're seeing is actually the intended behavior. I've simulated several different battery dynamics in my aircraft, including internal resistance and temperature effects.
A 24V battery has a nominal voltage of 25.8V when fully charged. When current is drawn from the battery, the voltage will droop in proportion to the amount of load. Here's we see ~0.9V droop when the battery master switch is placed in the on position. Try adding load, or engaging the starter, and you will see the voltage drop further. With the starter engaged, we go all the way down to 17V, and back up slowly, as the propeller begins to spin. When the generator comes online, the voltage will jump to 28V, which charges the battery.
This also affects the lighting in the aircraft, and other system too. You can read more in the "Voltmeter & Ammeters", and "Voltage-Based Light Dimming" sections of the manual.
Just for fun, you can see the LO VOLTS annunciator illuminated and the lights dim when the starter is engaged in this video. These are the details that I enjoy most about aviation
In the meantime, let me know if there is anything else I can do for you!
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@flightquay What you're seeing is actually the intended behavior. I've simulated several different battery dynamics in my aircraft, including internal resistance and temperature effects.
A 24V battery has a nominal voltage of 25.8V when fully charged. When current is drawn from the battery, the voltage will droop in proportion to the amount of load. Here's we see ~0.9V droop when the battery master switch is placed in the on position. Try adding load, or engaging the starter, and you will see the voltage drop further. With the starter engaged, we go all the way down to 17V, and back up slowly, as the propeller begins to spin. When the generator comes online, the voltage will jump to 28V, which charges the battery.
This also affects the lighting in the aircraft, and other system too. You can read more in the "Voltmeter & Ammeters", and "Voltage-Based Light Dimming" sections of the manual.
Just for fun, you can see the LO VOLTS annunciator illuminated and the lights dim when the starter is engaged in this video. These are the details that I enjoy most about aviation
In the meantime, let me know if there is anything else I can do for you!
Just go be sure I am understanding correctly, it is an intended behavior for it to be sitting bellow 25 volts with nothing on other than the battery? I just turned my game on to be sure and from cold and dark with only the battery switch on I get about 24.8 volts.
I only ask because in the check lists it says to ensure the voltmeter is above 25 volts!
