So my EVSE pulls 19a @ 240v. At home the voltage at the outlet is 237v NL(no load) and 233v under the 19a load. Using this setup I'm able to add 28% per hour to my '13 Leaf with the 6.6kw charger. At work I have access to a dedicated 30a outlet/circuit but at 208v(actually 203 at socket NL) because at work the power is 3 phase not single phase as at home but drops to 192v under the 19a load, at work I only add 18% per hour starting with the same state of charge on the battery. Now at work the outlet is quite some distance from the panel, probably half way across the building, still my percentage drop numbers don't work out and I'm wondering why.
Figuring the watts at home I get 4427w by multiplying 233v X 19a.
At work I get 3648w by multiplying 192v X 19a(I have no real way of measuring amps at work but I assume using the same EVSE it should be the same as at home, where I was able to measure it with a ammeter)....maybe this assumption is incorrect?
Now according to my calculations 4427w is 21.5% greater than 3648w but heres what I don't understand. 28%(how much I gain per hour at home) is 55% greater than 18%(how much I gain at work) :? Why doesn't the percentage gained in watts equal the percentage gained in charging percent per hour, comparing work to home?
Seeing how much voltage I drop at work I wonder if dropping the charge amps(something I can do as my EVSE is adjustable) would yield almost the same charge to the car. If I'm doing my math correct it looks like at work I'm losing 209 watts to wiring and such, which seems quite high. I don't know what the gauge of the wiring at work is but I'd assume 10G(probably no more) and I have felt components(outlet and 30a breaker) after charging for several hours and nothing seems abnormally warm. I can't really see or feel the actual wire because it's in metal conduit, which doesn't feel warm.
The whole thing is kind of a bummer as at work is where I'd really appreciate the ability to recover quickly, at home I have all the time in the world to charge, in fact I use the charging timer and I'm guessing most of the time the charging timer only starts hours before I go to work.
Figuring the watts at home I get 4427w by multiplying 233v X 19a.
At work I get 3648w by multiplying 192v X 19a(I have no real way of measuring amps at work but I assume using the same EVSE it should be the same as at home, where I was able to measure it with a ammeter)....maybe this assumption is incorrect?
Now according to my calculations 4427w is 21.5% greater than 3648w but heres what I don't understand. 28%(how much I gain per hour at home) is 55% greater than 18%(how much I gain at work) :? Why doesn't the percentage gained in watts equal the percentage gained in charging percent per hour, comparing work to home?
Seeing how much voltage I drop at work I wonder if dropping the charge amps(something I can do as my EVSE is adjustable) would yield almost the same charge to the car. If I'm doing my math correct it looks like at work I'm losing 209 watts to wiring and such, which seems quite high. I don't know what the gauge of the wiring at work is but I'd assume 10G(probably no more) and I have felt components(outlet and 30a breaker) after charging for several hours and nothing seems abnormally warm. I can't really see or feel the actual wire because it's in metal conduit, which doesn't feel warm.
The whole thing is kind of a bummer as at work is where I'd really appreciate the ability to recover quickly, at home I have all the time in the world to charge, in fact I use the charging timer and I'm guessing most of the time the charging timer only starts hours before I go to work.