Brian Dorricott 1 Posted September 10, 2021 Share Posted September 10, 2021 Just thought about using the voltage port on the above rx but can't find the max permissable voltage anywhere , I want to monitor a 6S hopefully without making a divider . Anyone know for sure ? Cheers Quote Link to comment Share on other sites More sharing options...
Brian Sweeting 1 Posted September 10, 2021 Share Posted September 10, 2021 Accepts up to 9 volts. Instruction manual here if you want it... Manual Quote Link to comment Share on other sites More sharing options...
BackinBlack Posted September 10, 2021 Share Posted September 10, 2021 9 volts is the max receiver supply voltage. The battery sensor input is designed for up to 14S - 60volts. See here, just over half way down the page, comment by Andy Kunz, one of Spektrum's engineers. Spektrum battery sensor voltage 1 Quote Link to comment Share on other sites More sharing options...
Brian Dorricott 1 Posted September 11, 2021 Author Share Posted September 11, 2021 60 volts that's plenty then , funny Spektrum don't mention it anywhere and you have to get it from a forum ! Above poster it's the telemetry voltage input I was after not the rx supply , means I can hook up my 6S lipo balance lead to the rx and monitor the the voltage . If it alarms every time I open the throttle its time to land and charge . Ta all Quote Link to comment Share on other sites More sharing options...
Brian Dorricott 1 Posted September 11, 2021 Author Share Posted September 11, 2021 Just put the rx on and used a calibrated bench power supply and it's accurate to .01 of a volt , impressive accuracy I don't need anything down to 10mV on a battery . Question now for a 6S what would you set the alarm for bearing in mind it will sag at WOT , does 22.2 volts sound about right ? Want to strike a balance between lots left and alarming every time the throttle is opened . Perfect would be a current monitor but never see any for sale . Quote Link to comment Share on other sites More sharing options...
Dickw Posted September 11, 2021 Share Posted September 11, 2021 (edited) Alarm setting really depends on what load you are applying. I have just checked some data logs for a regularly flown 6s setup of mine that peaks at just over 1 kW, and after several minutes into the flight I am seeing something like 21.3 volts at about 43 amps when I push the throttle wide open for a vertical climb. These are now fairly elderly 5000mAh Lipos, but I hope that helps. Dick Edited September 11, 2021 by Dickw Quote Link to comment Share on other sites More sharing options...
Dickw Posted September 11, 2021 Share Posted September 11, 2021 31 minutes ago, Brian Dorricott 1 said: .......................... Perfect would be a current monitor but never see any for sale . For in flight current, volts, rpm, altitude, etc. I use the SM UniSens-E. http://translate.google.com/translate?hl=en&sl=auto&tl=en&u=https%3A%2F%2Fwww.sm-modellbau.de%2FUniSens-E-und-Zubehoer Dick Quote Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted September 11, 2021 Share Posted September 11, 2021 1 hour ago, Dickw said: For in flight current, volts, rpm, altitude, etc. I use the SM UniSens-E. http://translate.google.com/translate?hl=en&sl=auto&tl=en&u=https%3A%2F%2Fwww.sm-modellbau.de%2FUniSens-E-und-Zubehoer Dick +1 I recently ordered 2 from Germany, expecting to pay UK VAT and the collection fee, they came VAT free and SM Modelbau had already deducted the German VAT, result ? BTW 22.2 volts is 3.7 volts per cell, OK under no load, but I would think you'd need to be at 3.3-3.4 volts per cell under load i.e. 20.4 volts. Which Tx are you using, does it do voice and can you set it up so low volts is a trigger for announcements, then rather than having as alarm, set it up to read out the voltage when it drops below a certain level. Quote Link to comment Share on other sites More sharing options...
BackinBlack Posted September 11, 2021 Share Posted September 11, 2021 (edited) You might also consider a Spektrum Avian ESC which reports motor current, volts, speed etc., via the ar6610t telemetry. They're not much more expensive than the UniSens unit, the 60 amp 6S unit is about £50, 80amp 8S about £69. Just a thought. Edit - might be a few more £ now, model shop Leeds £72 for the 80 amp version. Edited September 11, 2021 by BackinBlack updated info Quote Link to comment Share on other sites More sharing options...
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