KWh/ Mile? Justifying 19 cent KWh electric rate

i think it only takes 6.7kwh X .19 = $1.28

we pay .24/kwh, so ev driving isn't a bargain, but that's not the reason i drive it. nonuse of gasoline is wonderful for a variety of reasons. and gas won't be 2 bucks forever.

what do you mean by high compression ice, it's the same as any other prius. if you don't plug in, you'll be just like a lift back towing around a couple hundred spare pounds, like a lot of people in california carpool lanes.

 

Electricity cost more than gasoline these days. | Page 4 | PriusChat

 

You have to factor in charging efficiency too. A (very) loose rule of thumb is to use the battery's full capacity (8.8 in this case) as the multiplier to account for the inefficiencies of both the EVSE and the cars' internal charger. So, the OP is getting a closer real world figure for a full charge by using 8.8 x .19. Best to over estimate.

It gets cloudy when one has to factor in level 1 vs 2 charging as the latter units are typically more efficient.

 

Two people who have just measured the charge amount got (from memory) 6.3kWh and 6.7kWh from depleted Ev to full.

What you're missing is that the Ev range of the battery stops when the battery gets to something like 20-25%. The rest is reserved for Hv mode hybrid operation. 33.7kWh/gasoline gallon equivalent divided by 133MPGe = 253Wh/mile. Multiply by the rated range of 25 miles and you get an energy consumption - at the wall - of 6.3kWh.

 

If I'm reading this right, you're saying there's a 100% charging efficiency (6.3 in and 6.3 out).

 

No - MPGe is calculated from wall energy, not battery energy.

Miles per gallon gasoline equivalent - Wikipedia

"For EPA, this considers the tank-to-wheel for liquids and wall-to-wheel energy consumption for electricity, i.e. it measures the energy for which the owner usually pays. For EVs the energy cost includes the conversions from AC to charge the battery.[33]"

 

The sizes and cargo carrying capacity are quite a bit different.

If fuel cost is your only consideration then two other things come to mind:

1. You are hedging future gasoline prices with the Prime. Remember that OPEC wants to charge ~ $60/barrel and might be getting their act together
2. A Prime gives you the option of enjoying cheaper electricity in the future through things like home or community solar.

 

So from the two reports the average used in EV is approx. 6.5kWh. How much is required from the wall to charge it back to full?

For example, my Energi uses around 5.5-5.7 kWh from its 7.6kWh pack but needs about 8 kWhr from the OEM level 1 charger to fill it.

Common Electricity Questions for the C-Max Energi | C-MaxChat

 

I do not know *exactly,* but the Prime useable is somewhere in the 5.2 - 5.5 kWh range and charging losses varies from ~ 15% using a 240v charger and ~ 20% using a 110v.

 

6.3kWh, according to the EPA. 33700Wh/gallon / 133 MPGe * 25 miles = 6,334Wh.

 

Have you checked with your electric company to see if you can get a cheaper rate? I was able to put a second electric meter on a water heater in order to get a reduced rate.

 

Has anyone real world hypermiled the Prime in ev and gas modes to determine its true upper efficiency limits?

If it's like my volt
+20% is possible on gas
And +100% on ev

The benefits of the prime are that it really costs no more than a normal prii but gives energy choice.

You may we'll find the prime is still cheaper in town real world on electricity,

You will also find you can drive the prime on gas only

And solar or the possibility of increasing fuel prices make the prime a no brainer

 

I understand the math but reality can often be different sometimes more so. For instance, the Gen1 Volt 16kWh battery should only need 13ish kWh but sometimes it pulls 14.5-15 kWh due to heavy HVAC cooling use during the summer. Battery temps are another factor.

Like I said, my "rule" is very loose and over estimates on purpose. As the saying goes, YMMV.

 

I recharged from "empty" at a public station in Vegas. The registered kWh added was 6.3. The other day I recharged at a local public station but I wasn't fully empty (if I remember correctly, maybe had around 4-5 miles left). It did fully charge and 5.3 kWh was added.

 

[QUOTE="fotomoto, post: 2462675, member: 49996]For instance, the Gen1 Volt 16kWh battery should only need 13ish kWh but sometimes it pulls 14.5-15 kWh due to heavy HVAC cooling use during the summer. Battery temps are another factor.

Like I said, my "rule" is very loose and over estimates on purpose. As the saying goes, YMMV.[/QUOTE]

If you short fill the volt (don't charge fully) you sometimes find the kw in is under 5% different

Around here battery cooling runs under a week a year

 

What incentives in Mass? I see the old pip on there but not the prime. Also, take into count gas will go back up... It already has. And if the prime blends you might save money anyway. Gas and electric will fluctuate.

If gas is cheaper electric might go down or stay the same to compete.

 

no plug for the v in the near future.