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Old May 01, 2012, 04:11 AM
SteveM is offline
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Joined Dec 2002
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Frsky Voltage Sensor....really 5s max??

I have one of these:-
Frsky seem to think we can apply full 5s across it, wiring with the "3s" labelled option. (6:1)
But.... fully charged 5s is 21V, so we would be actually putting 3.5V across Rx input for a freshly charged pack , where the RX input is really designed for 3.3v max input
What am I missing?
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Old May 01, 2012, 10:48 AM
renatoa is offline
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Romania, Dolj, Craiova
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The inputs are protected, you can apply even full 5s on each of them and nothing bad happens.
They are partly right, when the voltage will be under 3.3 * 6 /5 = 3.96V per cell, i.e about 60-70% of charge, the display will start to show the right voltage.
The alarms are set much lower than 3.96V per cell anyway, so we are OK with the alarms too.
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