GH Crash
Member
I need some electronic expertise on the value (importance) of ESR for lithium-ion capacitor when the capacitor will be used as battery replacement for small brushed DC motors.
In model aviation, there is a class of aircraft that are referred to as free flights. One group of free flight aircraft use a small DC motor that is powered from a small, usually Lipo, battery. Part of the electric free flight group have replaced the battery with a 10 to 100F supercapacitor (EDLC). The higher voltage, higher capacitance and low self-discharge of the LIC seem to offer advantages over the EDLC. Several individuals feel that the relatively high ESR of a LIC make them unsuitable as an EDLC replacement. Other individuals feel that the ESR may not be a significant factor since the capacitor will be operating at virtually zero frequency.
I would be interested to hear your ideas concerning ESR when using a LIC as if it were a battery. Remember that we are talking about capacitors with a capacitance greater than ten Farads.
Please, don't bother to tell me that a battery would be a better choice. For the sake of this thread (posting) assume a battery cannot be used for reasons that are outside this discussion.
In model aviation, there is a class of aircraft that are referred to as free flights. One group of free flight aircraft use a small DC motor that is powered from a small, usually Lipo, battery. Part of the electric free flight group have replaced the battery with a 10 to 100F supercapacitor (EDLC). The higher voltage, higher capacitance and low self-discharge of the LIC seem to offer advantages over the EDLC. Several individuals feel that the relatively high ESR of a LIC make them unsuitable as an EDLC replacement. Other individuals feel that the ESR may not be a significant factor since the capacitor will be operating at virtually zero frequency.
I would be interested to hear your ideas concerning ESR when using a LIC as if it were a battery. Remember that we are talking about capacitors with a capacitance greater than ten Farads.
Please, don't bother to tell me that a battery would be a better choice. For the sake of this thread (posting) assume a battery cannot be used for reasons that are outside this discussion.