I know it’s a joke, but many Tesla “solar” charging stations did actually use diesel generators a few years ago. Citation needed, but I can’t be assed to look up the article.
Debatable, it depends on what fraction of the power was supplied by the generator. The chemical-kinetic-electric energy conversion incurs great losses because of waste heat, and portable diesel generators are not always built with efficiency in mind. A charging station operating on 100% diesel to power an EV is much less efficient than a modern ICE vehicle of a similar mass sans batteries.
A charging station operating on 100% diesel to power an EV is much less efficient than a modern ICE vehicle of a similar mass sans batteries.
Citation needed. Do ICE engines not get hot and therefore also have great losses because of waste heat?
Presumably a generator making electricity for a charging station would only run when electricity is needed, while an ICE engine would be losing energy to heat the entire time the vehicle is idling in traffic.
Why would a diesel generator not be made to efficient and why are ICE engines always made to be efficient? How do you know which kind of generator they were using? Why would they use the generator for 100% of the energy needed?
Keeping in mind that this is a hypothetical scenario and that I did point out that the overall efficiency is dependent on how much of the power is generated by renewables and how much by the on-site diesel generator:
An ICE skips the conversion to electricity and its storage. Losses and losses.
An ICE vehicle weighs less than an EV of a similar size because it doesn’t have batteries (see this chart to compare the energy density (MJ/kg, horizontal axis) of lithium batteries to gasoline and diesel)
There is a point in the diesel/solar ratio at which the system’s overall efficiency is higher with an EV than an ICE, but I don’t know where that is because, once again, you’re pissing yourself over a hypothetical scenario.
It doesn’t really matter actually. Electric motors are so much better at delivering power, that you will get more range from a gallon of gas by towing an ‘flat battery’ EV behind a truck and then driving the EV than you will just driving the truck without towing the EV.
To clarify, ICE produce so much waste heat that defrosting and heating your car is essentially free (energetically speaking) because the car needed to dump that excess heat anyway.
BEVs don’t even generate enough waste heat to maintain the battery temp, and frequently rely on heaters to maintain battery and cabin temperature.
So saying BEVs create waste heat too is technically true, but it seriously undersells the scale of difference between the BEV and the ICE.
We actually do. The BMW i3 came with a gas generator as an optional range extender feature. It was not very popular. The majority of drivers drive less than 40 miles a day, and EVs easily encompass that distance, even if you have to run the heat.
And yes, an electric vehicle powered by a combustion motor absolutely is better in terms of efficiency down to extremely small scales. We’ve been using diesel electric vehicles for decades now because of their efficiency, torque, and long service life. They’re called ‘trains’.
Last I ran the numbers, it seemed like on paper charging off an industrial scale generator was around 20-30% more fuel efficient per km than directly running an ICE car, but I based it on the advertised efficiency values of a random average seeming diesel car, compared to rather pessimistic charging loss and efficiency numbers for the EV. The inefficiency of even modern ICE cars is quite astonishing, even compared to the engine in a generator that can constantly run at the optimal RPM and load for efficiency.
Not to mention the electrical energy stored in their cells has a fairly strong possibility of having been generated by a power plant consuming coal or petroleum.
I live in Alberta where most of our power comes from natural gas. I’m also an emissions and sustainability engineer. I did the math on environmental payback for an EV where I live and the EV is WILDLY better for the environment despite the power potentially coming from fossil fuels.
If you tell me roughly where you live I can calculate emissions per kilometre/mile including the energy that goes into manufacturing the vehicle.
There’s absolutely jurisdictions where EVs don’t make much difference - but most places they do.
(large scale power generation is pretty effecient and most jurisdictions have some renewables in the mix. A car’s gas engine is much lower efficiency most places)
No disputes from me on your assessment. In principle I’m a big fan of EVs as a maturing technology and my only hangup with Tesla is its association with the person who is its CEO and the role he’s chosen to play in US politics.
I’ll gladly champion a vehicle that has incredible efficiency in converting its stored energy into mechanical work, especially when that stored energy came from a source that’s 40-60% thermally efficient (for combustion-based processes) or derived from solar/wind/geothermal/hydro sources and can be partially recuperated via braking. It’s too bad there aren’t more EV options for people who want or need a 3/4 or 1-ton pickup (of which I happen to be a big fan for hauling/towing/plowing).
The one area where I’m still dubious of electric vehicles is in cold climates, although I think I’ve read heat pumps are being used with success. Otherwise, I’d propose a small auxiliary tank (preferably propane, if infrastructure permits) and a “Chinese diesel heater”-type unit be installed simply for cabin heating/defogging. Few energy conversions make me cringe more than that of high-exergy electricity (derived from non-renewables) directly into thermal energy, convenient as it may be for the end user.
Of course, it’d be nice if that combustive heat could be generated from sustainably-harvested hydrogen instead of an extracted hydrocarbon, but at that point, a fuel cell running a heat pump would be even better, with resistive waste heat from the FC an added bonus. But now it all feels a bit Rube Goldbergian…
Anyway, what’s your take on EV use in climates with harsh winters (such as Canada/Alaska/Montana/Wyoming/Minnesota), especially when long range might be needed?
My partner and I backcountry ski, iceclimb etc. One of the reasons we went with the Ioniq 5 was that we can sleep in the back and use the heat pump to keep us warm.
We recently did a weeklong ski trip with it. We drove from from Golden, BC back to Calgary, AB (250km/150mi) in -16C (3F) and used 70% of a charge. One day on that trip, we were backcountry skiing in similar weather and the car sat outside in that weather for 8 hours. No loss of battery.
One of the unexpected features I really enjoy is that I never pump gas in the cold any more. I programmed my work schedule and the car pre-warms for my commute. I get home, plug the car in, and it’s always ready to go.
I have a few family members with heat pumps (I’m in Canada) and they work well. They do need to be supplemented for the coldest days, but they have an electric heater integrated into the system for that. Last month was particularly cold (every day was below freezing) and resulted in some very high power bills, but still worked out to be less costly than oil or even wood.
In terms of EVs not working well in the cold… yeah and neither do Diesel engines. Need to plug in a block heater if you want your diesel engine to start on a cold morning. Seems a really easy fix to have something similar for an EV, and since you’re plugging it in anyway, it shouldn’t be a big problem.
EVs are kinda a no-brainer in terms of energy usage. Way cheaper than gas or diesel, only problem is there’s a significant upfront cost at the moment. Once some lithium mines come online and we get some economies of scale going on making the batteries that upfront cost drops too. Other than the battery, an EV is way simpler than an ICE vehicle, and all studies have shown they will last significantly longer than an ICE vehicle. Electric motors aren’t all that complicated, the batteries are getting to be mature tech now, so there’s less that can go wrong with them than with complicated ICE powered vehicle.
Even when powered by fossil fuel power plants, electric vehicles are still usually better in terms of CO2 emissions. Power plants benefit from scale, so they’re a lot more efficient than the tiny combustion engines in cars. Regenerative braking also saves a ton of energy when driving in the city.
I know it’s a joke, but many Tesla “solar” charging stations did actually use diesel generators a few years ago. Citation needed, but I can’t be assed to look up the article.
Still more energy efficient than a regular ICE car.
Debatable, it depends on what fraction of the power was supplied by the generator. The chemical-kinetic-electric energy conversion incurs great losses because of waste heat, and portable diesel generators are not always built with efficiency in mind. A charging station operating on 100% diesel to power an EV is much less efficient than a modern ICE vehicle of a similar mass sans batteries.
Citation needed. Do ICE engines not get hot and therefore also have great losses because of waste heat?
Presumably a generator making electricity for a charging station would only run when electricity is needed, while an ICE engine would be losing energy to heat the entire time the vehicle is idling in traffic.
Why would a diesel generator not be made to efficient and why are ICE engines always made to be efficient? How do you know which kind of generator they were using? Why would they use the generator for 100% of the energy needed?
Keeping in mind that this is a hypothetical scenario and that I did point out that the overall efficiency is dependent on how much of the power is generated by renewables and how much by the on-site diesel generator:
It doesn’t really matter actually. Electric motors are so much better at delivering power, that you will get more range from a gallon of gas by towing an ‘flat battery’ EV behind a truck and then driving the EV than you will just driving the truck without towing the EV.
Yes it gets also hot, but the battery as well, during charging and using.
To clarify, ICE produce so much waste heat that defrosting and heating your car is essentially free (energetically speaking) because the car needed to dump that excess heat anyway.
BEVs don’t even generate enough waste heat to maintain the battery temp, and frequently rely on heaters to maintain battery and cabin temperature.
So saying BEVs create waste heat too is technically true, but it seriously undersells the scale of difference between the BEV and the ICE.
We would just put diesel generators in the trunk if any of that would make sense.
No, an electric car powered by a Diesel generator is definitively not more effective than a combustion car.
The thought doesnt even make sense, since a Diesel generator is a combustion engine.
We actually do. The BMW i3 came with a gas generator as an optional range extender feature. It was not very popular. The majority of drivers drive less than 40 miles a day, and EVs easily encompass that distance, even if you have to run the heat.
And yes, an electric vehicle powered by a combustion motor absolutely is better in terms of efficiency down to extremely small scales. We’ve been using diesel electric vehicles for decades now because of their efficiency, torque, and long service life. They’re called ‘trains’.
Holy smokes, is this bizarro world?
Youre arguing against the principle of physics.
What makes a Diesel generator better then … Checks notes… a Diesel Generator?
By your logic it becomes better when it’s used to charge a battery first.
Last I ran the numbers, it seemed like on paper charging off an industrial scale generator was around 20-30% more fuel efficient per km than directly running an ICE car, but I based it on the advertised efficiency values of a random average seeming diesel car, compared to rather pessimistic charging loss and efficiency numbers for the EV. The inefficiency of even modern ICE cars is quite astonishing, even compared to the engine in a generator that can constantly run at the optimal RPM and load for efficiency.
Not to mention the electrical energy stored in their cells has a fairly strong possibility of having been generated by a power plant consuming coal or petroleum.
I live in Alberta where most of our power comes from natural gas. I’m also an emissions and sustainability engineer. I did the math on environmental payback for an EV where I live and the EV is WILDLY better for the environment despite the power potentially coming from fossil fuels.
If you tell me roughly where you live I can calculate emissions per kilometre/mile including the energy that goes into manufacturing the vehicle.
There’s absolutely jurisdictions where EVs don’t make much difference - but most places they do.
(large scale power generation is pretty effecient and most jurisdictions have some renewables in the mix. A car’s gas engine is much lower efficiency most places)
No disputes from me on your assessment. In principle I’m a big fan of EVs as a maturing technology and my only hangup with Tesla is its association with the person who is its CEO and the role he’s chosen to play in US politics.
I’ll gladly champion a vehicle that has incredible efficiency in converting its stored energy into mechanical work, especially when that stored energy came from a source that’s 40-60% thermally efficient (for combustion-based processes) or derived from solar/wind/geothermal/hydro sources and can be partially recuperated via braking. It’s too bad there aren’t more EV options for people who want or need a 3/4 or 1-ton pickup (of which I happen to be a big fan for hauling/towing/plowing).
The one area where I’m still dubious of electric vehicles is in cold climates, although I think I’ve read heat pumps are being used with success. Otherwise, I’d propose a small auxiliary tank (preferably propane, if infrastructure permits) and a “Chinese diesel heater”-type unit be installed simply for cabin heating/defogging. Few energy conversions make me cringe more than that of high-exergy electricity (derived from non-renewables) directly into thermal energy, convenient as it may be for the end user.
Of course, it’d be nice if that combustive heat could be generated from sustainably-harvested hydrogen instead of an extracted hydrocarbon, but at that point, a fuel cell running a heat pump would be even better, with resistive waste heat from the FC an added bonus. But now it all feels a bit Rube Goldbergian…
Anyway, what’s your take on EV use in climates with harsh winters (such as Canada/Alaska/Montana/Wyoming/Minnesota), especially when long range might be needed?
My partner and I backcountry ski, iceclimb etc. One of the reasons we went with the Ioniq 5 was that we can sleep in the back and use the heat pump to keep us warm.
We recently did a weeklong ski trip with it. We drove from from Golden, BC back to Calgary, AB (250km/150mi) in -16C (3F) and used 70% of a charge. One day on that trip, we were backcountry skiing in similar weather and the car sat outside in that weather for 8 hours. No loss of battery.
One of the unexpected features I really enjoy is that I never pump gas in the cold any more. I programmed my work schedule and the car pre-warms for my commute. I get home, plug the car in, and it’s always ready to go.
I have a few family members with heat pumps (I’m in Canada) and they work well. They do need to be supplemented for the coldest days, but they have an electric heater integrated into the system for that. Last month was particularly cold (every day was below freezing) and resulted in some very high power bills, but still worked out to be less costly than oil or even wood.
In terms of EVs not working well in the cold… yeah and neither do Diesel engines. Need to plug in a block heater if you want your diesel engine to start on a cold morning. Seems a really easy fix to have something similar for an EV, and since you’re plugging it in anyway, it shouldn’t be a big problem.
EVs are kinda a no-brainer in terms of energy usage. Way cheaper than gas or diesel, only problem is there’s a significant upfront cost at the moment. Once some lithium mines come online and we get some economies of scale going on making the batteries that upfront cost drops too. Other than the battery, an EV is way simpler than an ICE vehicle, and all studies have shown they will last significantly longer than an ICE vehicle. Electric motors aren’t all that complicated, the batteries are getting to be mature tech now, so there’s less that can go wrong with them than with complicated ICE powered vehicle.
Yes the fossil fuel industry loved to point this one out. “Hahaha! We’re so dirty even your clean tech can’t be clean!”
Even when powered by fossil fuel power plants, electric vehicles are still usually better in terms of CO2 emissions. Power plants benefit from scale, so they’re a lot more efficient than the tiny combustion engines in cars. Regenerative braking also saves a ton of energy when driving in the city.