If you have a new Rav4 EV with no battery degradation, then you can go 142 miles at 65mph (3.4 miles per kWh * 41.8kWh usable) on level terrain. At 55mph, that will jump up to about 163 miles (3.9 miles * 41.8kWh usable). NOTE: no consideration made for wind, terrain, elevation gain, heater use, etc.
Absolutely no heater. Seat heaters are OK. Air conditioning is OK, too, but use some restraint. If it is 110F out, perhaps only cool the cabin to 80F-85F.
So, first the obvious. You need to start with a 100% "extended charge". There is some good news... even though you go over a mountain range and through Death Valley, the beginning and ending elevation is about the same at Las Vegas and at Barstow (around 2000 feet).
I highly, highly recommend the
Tesla UMC to J1772 conversion. Full 40 amps, and you can get 240 volts at RV parks. There is one at:
137 miles from the Las Vegas strip:
Twin Lakes RV Park
50 amp service, NEMA 14-50
760-257-3377
46200 Twin Lakes Rd
Newberry Springs, CA 92365
142 miles from the Las Vegas strip:
Newberry Mountain RV Park
50 amp service, NEMA 14-50
760-257-0066
47700-47798 National Trails Hwy
Newberry Springs, CA 92365
144 miles from the Las Vegas strip:
KOA Campground
50 amp service, NEMA 14-50
760-254-2311
35250 Outer Hwy 15
Newberry Springs, California 92365
Roadster charge station at (you would need a Roadster adaptor... I could rent you mine, if you want):
157 miles from the Las Vegas strip:
McDonalds, to the right of the drive-through
1611 E Main St
Barstow California 92311
You will need five hours of charging at the RV parks, and probably 6 hours at the Roadster charge station. You can charge at the full 40 amp rate, and you are extremely unlikely to have a lowly LEAF, or Plug-In Prius, etc, hogging all those amps at either an RV park or the Roadster charger.
If you decide to use public J1772 for this trip, good luck. At 208 volts and 30 amps max, you just added many hours to that five hour charge time.
There is exactly ONE J1772 at:
Whiskey Pete's
100 W Primm Blvd
Jean, Nevada 89019
Good luck if it's in use, or broken, etc. Because this is only 30 amps at 208 volts, I recommend the MINIMUM you'll to get comfortably to the Barstow or Newberry Springs area. At 208v/30a, you will gain 18.7 miles per hour charging for 65 mph down the freeway (NOTE: no consideration made for wind, terrain, elevation gain, heater use, etc). You will need a ChargePoint card. I also recommend a Blink card for the trip.
It's another 177 miles to downtown San Diego from the Roadster charge station in Barstow, and there are TONS of places to charge. Easy.
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Miles Gained per Hour Charging @ 87.5% charger efficiency
70F Ambient temperature - hotter or colder will decrease miles gained
---------------------------- 2.7 miles/kWh - 3.4 miles/kWh
Amps/Volts -- Where ------ City Drive ----- 65mph
12 / 120 ------- Any ------ 2.8 miles ------ 3.5 miles (supplied cable with car)
12 / 240 ------ Home ----- 6.8 miles ------ 8.6 miles (EVSEupgrade.com mod)
16 / 208 ------ Public ----- 7.5 miles ------ 9.5 miles (2011-2012 LEEF EVSE doesn't work)
16 / 240 ------ Home ----- 8.9 miles ----- 11.2 miles (2011-2012 LEEF EVSE doesn't work)
20 / 208 ------ Public ----- 9.4 miles ----- 11.9 miles (2013 LEEF EVSEupgrade.com)
20 / 240 ------ Home ---- 11.0 miles ----- 13.9 miles (Clipper Creek LCS-25)
24 / 240 ------ Home ---- 13.6 miles ----- 17.7 miles (dryer outlet)
25 / 250 ------ Home ---- 13.7 miles ----- 17.9 miles (2013 LEEF EVSEupgrade.com)
30 / 208 ------ Public ---- 14.8 miles ----- 18.7 miles (typical public J1772)
30 / 240 ------ Home ---- 17.1 miles ----- 21.6 miles (rare public J1772)
40 / 208 ------ Public ---- 18.5 miles ----- 23.4 miles (Tesla Roadster/Clipper Creek)
40 / 240 ------ Home ---- 22.7 miles ----- 28.5 miles (RV park, welder outlet, Tesla UMC)