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Load sharing max current on two connected Gen 2 HPWCs

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jebinc

Well-Known Member
Jun 19, 2019
13,747
20,856
Seattle area
Cross-post

Good morning - Technical help requested... So, I added a "slave" to my gen 2 HPWC. The master is fed by a 60 amp circuit (48A charging). Both the Slave and Master HPWC's are fed with 4AWG cable (overkill, yes). Slave rotary switch is on "F" and the master is on "9" (60 amps). Communication cable is 18AWG shielded that is grounded on both ends at the ground block. Junction box connections are made with high end Polaris Multitaps.

Prior to adding the "slave," I was always able to charge at 48A, as reported on the car's main screen. Now, the max I can get on either the slave or master is 39A when charging using just one of the HPWCs. What gives?