HPWC Question

HPWC Question

in the HPWC charger there are dip switches to configure the charger to know the size of the breaker it's wired to.

Question is related to the 80% rule (40 amp breaker only use 32 amps of continuous load).

Do you set the dip-switches in the HPWC to match the breaker, or the draw?

i.e. if I have a 60 amp breaker - would I set the HPWC dip switches to the 50 amp setting or the 60 amp setting?


Pungoteague_Dave | 2 marzo 2013

Why wire a HPWC up to less than 100 amps? Not trying to start an argument, just curious, as they are quite expensive. Am I missing something? It seems that if at HPWC is configured below full power it defeats the purpose, with cheaper options available for charging if the lower amps are all that's available. What am I missing?

dortor | 2 marzo 2013

I can get a 60 or 80 am circuit - just one a 100 amp circuit - too many breakers in the main box and the run to garage is already rated for 60 (maybe 80)…

and 60 amps is still faster than 40 or 50 amps.

dortor | 2 marzo 2013

post above should say "just not a 100 amp circuit"

Musterion | 2 marzo 2013

P.12 in the HPWC manual says that the DIP switches are set according to the breaker rating. It will automatically draw only up to 80% of this setting. Wiring of course should be sized to the breaker rating (the larger current).

Musterion | 2 marzo 2013

Some folks like @dortor just don't have the extra capacity, and HPWC might be a cost effective option for charging over 50 amps. It lets you carry the UMC and gives you the option of upgrading your electrical down the road and using the same charging infrastructure. It is also possible that the tax break for charging infrastructure does not apply to buying another UMC since not hard-wired, hence cost of HPWC reduced after taking the tax savings.

dortor | 2 marzo 2013

@Musterion - thanks for your reply - that's my read of the instructions as well - I just wanted to make sure I was reading it correctly.

@pungo is correct - for the the HPWC is good in four ways:

a) it's slightly faster than the mobile charger
b) it's way more convenient - pull into the garage - plug-in - dont' have to pop the trunk.
c) let's me leave the mobile charger in the trunk
d) easier to leave - unplug - drive - don't have to wind up any cords or pack anything…

I had a previous EV and the in-garage charger is just hard to beat - so the HPWC was a no-brainer for me.

sergiyz | 2 marzo 2013

Did anyone get the cable management piece for the HPWC yet ?
They've attached a note saying it would ship in Feb.
Well, it's March now, no sign of it yet.
The connector is so easy to scratch and given the cable size it slips and falls on a regular basis.
Charging speed is great though, as well as improved efficiency.

Alex K | 3 marzo 2013

sergiyz | MARCH 2, 2013: Did anyone get the cable management piece for the HPWC yet ?

Some people have purchased a Panduit J-Pro Cable Support System Wall Mount Hanger in the mean time.

Bob W | 2 aprile 2013

I'm using a "Suncast® Hose Hangout", model HH150 (a plastic garden hose hanger) to coil the cable for my Model S mobile charging cable in the garage. I mounted it to the edge of my wood work bench, near the 14-50 outlet.

It's also available at Ace Hardware, Item No. 7205297. The Tesla connector fits nicely inside the top two slots and it is easy to remove.

Note: to avoid excessive cable heat, don't charge at 40A with the cable tightly coiled around the hanger. Large loose coils while charging are no problem.

jat | 2 aprile 2013

I'm actually planning on charging at ~60A most of the time when I get my HPWC, so the LEAF and Model S can charge at the same time without tripping the garage subpanel main breaker. On the occasion when I need to leave quickly after getting home from work, I can charge at 80A (making sure the LEAF isn't charging at the same time).