John Vance Posted March 7, 2017 Report Share Posted March 7, 2017 I'd like to make sure that I'm correctly interpreting the electrical current reading / warnings on the Dynon EMS in my CT. 1) From the electrical schematic, it looks like the Dynon is wired to indicate a negative current when the battery is being charged (the battery side of the shunt is wired to the high side of the D120 ammeter). Is that correct? 2) What is a normal value for electrical current? The indication I get during cruising flight when starting with a fully charged battery (using CTEK charger) bounces between (roughy) -4 and -11 amps with all the equipment running. That seems high to me, and is mostly in "yelllow" territory on the screen. 3) Could the following scenario have been caused by low battery charge state?: A couple of weeks ago, I got a "low current" warning on the D120, during climb-out for what was supposed to be a longish cross-country flight. Ground idle time before takeoff was prolonged due to other traffic. After takeoff, the current flirted with the low limit for awhile, then pegged out at -31 amps and stayed there. It took about 15 minutes to return to the airport, and during that time, the D120 showed the voltage at 13.1. After landing, with engine at idle, voltage dropped to 12.1. I have not, until yesterday, used a battery charger, so the battery was not fully charged before this flight. Link to comment Share on other sites More sharing options...
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