JBee
Well-known member
- First Name
- JB
- Joined
- Nov 22, 2019
- Threads
- 14
- Messages
- 3,596
- Reaction score
- 486
- Location
- Australia
- Vehicles
- Cybertruck
- Occupation
- . Professional Hobbyist
Time if use is my primary concern, because network only use a small proportion of what they can because they have to be able to supply peak power. I agree with that, but centralized generation or storage does not help reduce peak or improve network utilisation. And time of use "peak" power is ultimately the networks main constraint. I'm all for better utilisation of hardware, but for that you need a buffer to smooth, and they are not better in centralised locations but should also distributed to reduce line losses and at the same time increase local network capacity without a single new grid line being laid. Distributed and embedded generation does more than centralised in this scenario. at a lower cost. Especially if you use already underutilized resources in the form of V2X EVs.Your analysis exposes the fundemental flaw in your reasoning when you suggest that a 30% increase in electrical consumption requires a grid with 30% more capacity. That's not how grids work because you have to account for the time of use. The current grid is operated on a daily basis of around only 15% capacity (it varies by geographical area but is very low in all cases).
This is the whole idea behind the growing popularity of time-of-use billing, to encourage the increased utilization of existing assets (both generation and distribution assets). The cost per kWh of the infrastructure is totally dependent upon how many kWh it is delivering over time. EV's increase the utilization of grid assets so they provide more revenue per unit of investment. This is why it is not problematic to increase grid capacity 10% to increase revenue by 30%.
Agreed, but in most household cases and many industrial cases distributed improves network and generation utilization, and allows for more embedded RE and a more resilient diverse electrical network.While I agree that distributed systems are the best solution, and also the way things are moving, the distributed assets don't necessarily need to be owned at the individual level. In some cases that makes sense, but not in all cases.
This is exactly where the time of use argument is most important. For example: A lot of EV's charge slowly at night. But there is no solar at night. Wind is also intermittent and hardly as predicable or dependable as solar (depending on your latitude). Hydro and nuclear would be dependable dispatchable base load as would be fossils.For example, it makes sense to have roof-top solar (but not wind). Wind is more efficient the larger the turbine. It's a huge difference in cost/kWh and effort to maintain. And it's absolutely silly to use mobile batteries for grid scale storage, even when distributed. Cars need to be light and affordable - we don't want our energy storage systems driving around on the road every day when they are inaccessible or low on charge when you need them the most. Batteries are heavy and belong in dedicated packs at the sub-station level or situated in conjuction with grid-scale solar generation or high consumption facilities with uneven demand like fast charging stations. Battery packs in cars should be sized for the car, not for supplemental grid storage. I once believed that was a good idea too. Then I learned the specifics and was flexible enough to change my mind to align more closely with the reality of the situation. It sounds good at first blush but it's not the best answer to the need for energy storage.
The question then becomes how do we intentionally make a network function so that it uses the least amount of fossil and nuclear, with the smallest amount of effort and resources.
I believe V2X EV's are that underutilized resource. They are dispatchable, inherently moveable assets and are available for large periods of the daytime when the solar is available (e.g. at work) and can take that energy home for use at night when it gets dark. They can also buffer SC use in small remote grids. They can buffer industrial loads at work, they can provide spinning reserve for network stability etc etc. All with the addition of a bidirectional charger at home and at work, all without physically requiring a major network upgrade to what is already installed.
This is exactly why I mention heat as the primary source of energy consumption in the household. If we reduce heat usage, we automatically reduce electrical consumption on the network, making V2X even more viable.That's a silly statement because it conflates the source of the energy with the use of the energy. Electrical energy can be converted to heat, light or motion. So can gas.
I could just as easily say: "The primary type of energy used in any household is heat. Not gas."
The same statement is also just plain wrong because in many households the primary type of energy is used for cooling (both refrigeration and air conditioning). It really depends upon the climate.
In the future (and to a more limited degree, in the present), electricity will be the most cost effective and the most environmentally friendly way to provide supplemental heat to a home. A heat pump can provide 3-8 times as much heat as the electricity consumed. Because it moves heat from where it is not needed or wanted (either underground or outside air) to where it is wanted (inside the structure). And it does it many times more efficiently than any type of gas (including bio-gas). Of course, in most climate zones in North America, passive solar with thermal mass storage is the most cost effective and environmentally friendly way to provide most building heating needs. This will be supplemented by heat pumps running on green electricity in the future.
As you say we can use heat pumps but even better is stop wasting heat by having "leaky bucket homes" where there is not enough insulation or lack of air tight building envelope.
And with heat pumps and your own solar, it's possible to use a hydronic heating system to store heat energy instead of using batteries. All for the cost of a insulated tank to store hot or cold water in. And by using a hydronic system on a insulated house you can have days of storage in a water tank, without ever having to take power from the grid, meaning the V2X EV is even more available for grid buffering.
Space heating accounts for 43% of US household consumption, Water heating 19% that's 62% just for heat. Further to "remove heat" through Air Conditioning requires another 8%. That's 70% of energy use just for heat management, that could all be reduced or at a minimum produced appropriately to reduce demand on the grid.
This "heat consumption" is not an "electrical" problem, and shouldn't be dealt with as one. There are many other countries that empathize this more.