What are you measuring the esc voltage with? The esc output isnt dc. The peak voltage output will Be same as the battery voltage but thats not what the meter reads. The peak to peak v wont change, its the frequency and pulse width that changes. Using ac meter will interpret this as voltage change but it's not really whats going on. To really see whats happening you need to put a scope on it. See if all the waveforms are equal and maybe a current shunt and or current clamp on scope as well.
Problem might be the voltage cut off if you have it set for reduce power. Try disabling it.
Last edited by Great_Thark; 16-02-2014 at 09:10 PM.
Reason: typo
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