daveo4EV
Well-Known Member
- First Name
- David
- Joined
- Jan 28, 2019
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- Santa Cruz
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- Cayenne Hybrid, 911(s) GT3/Convertable
- Thread starter
- #16
thanks for the update @KenU - I would "buy" the wrong gauge wire thing if the wire from the sub-panel to the NEMA 14-50 plug was also getting warm - my data for my setup shows that the _ONLY_ component that is suffering from an increase in temperatures is the Porsche NEMA 14-50 supply cable - there are essentially 4 segments to this system
after 5 hours charging @ 39.4 amps - temperatures are stable, consistent with the supply cable the only component offering any temperature deviation significantly above 90F (see segment #2 readings)
I'm not an electrical engineer and only have a DIY understanding of residential AC electrical systems, but my guess is the NEMA 14-50 supply cable from Porsche is the wrong gauge.
- wire from the breaker to the NEMA 14-50 plug (and the breaker itself)
- Porsche supply cable to the PMCC
- PMCC itself
- Porsche J-1772 cable from the PMCC to the vehicle
- 92F or less (including the breaker itself)
- 122F - 166F
- 94F or less
- 90F or less (including the J-1772 plug at the vehicle)
after 5 hours charging @ 39.4 amps - temperatures are stable, consistent with the supply cable the only component offering any temperature deviation significantly above 90F (see segment #2 readings)
I'm not an electrical engineer and only have a DIY understanding of residential AC electrical systems, but my guess is the NEMA 14-50 supply cable from Porsche is the wrong gauge.
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