Phil (the EVSE mod guy) will be making some measurements to better nail down the real efficiency of the 240 volt EVSE and also trying to figure out how much power the cooling system is taking.Herm wrote:I'm ok with the efficiency numbers for typical power supplies and chargers, but the 350w fixed overhead sounds a bit too high.. but in any case is all a case of circular logic since NO ONE has measured the wattage going in and out of the battery while being charged.. who will be the first dedicated Lead owner to actually make some measurements?DaveinOlyWA wrote: hate to burst your bubble, but many of us have found the 120 volt efficiency to be around 75% so you would have around 19.5 KWH used.
... i am looking at a charging efficiency of probably 88-90% then a set overhead for the charge management (which should be small) and cooling system which is small but still significant.
so the longer the charge time, the greater the hit on the overall charging efficiency. most have seen 85-88% on 240, around 75% on 120.
remember the 350 watt # is also charger inefficiencies, so if looking at cooling alone, its probably in the 175-200 watt range