3 ms·

Edit: sorry, forgot a part, yes you can recharge and EV even at 100W but the battery do not balance cells, as a result it last less time. Witch means for instan

Edit: sorry, forgot a part, yes you can recharge and EV even at 100W but the battery do not balance cells, as a result it last less time. Witch means for instance 8 years instead of 10 of usable life. 7kW is generally the "needed mean" to balance for most EVs, normally you have such issue mentioned in the manual. Can you show me an example, I looked at the owners manual for a few cars and none mentioned an issue with slow Level1 charging. Few big enough power plants can coordinate themselves to monitor and decide, too many small and spread can't. Even with frequency shifting witch is the fastest and simplest way possible we can't. My utility can already turn off my air conditioner during peak demand, why is it harder to turn off a 4000W load when they need more power than to turn on a 4000W battery when they need more power?

kkfx 4y ago
I have no example at hand, but if you look at "lithium battery cell balancing" you find many sources, two at random A very generic article https://www.saftbatteries.com/energizing-iot/lithium-ion-batteries-use-5-more-tips-longer-lifespan https://www.saftbatteries.com/energizing-iot/lithium-ion-bat... A thesis who cite many balancing technique https://tel.archives-ouvertes.fr/tel-03584252/document https://tel.archives-ouvertes.fr/tel-03584252/document Another normal advise is not to charge at 100%, not because it's bad in general, the contrary it's NEEDED for a proper cell balance, but on cars have a potential issue, the very same who is an issue for the grid stabilization: when you ask for more power your battery and inverters do their best to give it, but when the demand drop, for instance because you have hit the accelerator then release it, there is an excess of power and on a battery-only system like a car you have no grid to push excess energy to nor you can shut down. As a result you divert excess back to the battery crating high DC ripple effects overheating and stressing the battery itself. > My utility can already turn off my air conditioner during peak demand, why is it harder to turn off a 4000W load when they need more power than to turn on a 4000W battery when they need more power? It's not an on-and-off problem but a how quick such on-and-off can happen. As I suggest try seeing your p.v. system when it works. Try see how the frequency spike constantly with p.v. inverter active and how stable is (normally) on the grid, try to se what happen when you start a big load and when it drop. To see that better, if you have lithium storage try to run exclusively on it+solar and see what happen. AC is veeeery nice for many aspects, but it's hard for others. Try to keep a grid at a certain frequency is NOT an easy business, trying to do so with a gazillion of small generators is next to impossible. Smartness is a modern hope we add in both regulatory capacity for generators and avoid sudden loads spikes because smarter loads can potentially advise generators before starting or stopping and eventually ramp up or down slowly. However so far we are in an uncharted territory with just very little experiments and nothing on scale.

kkfx 4y ago

I have no example at hand, but if you look at "lithium battery cell balancing" you find many sources, two at random A very generic article https://www.saftbatteries.com/energizing-iot/lithium-ion-batteries-use-5-more-tips-longer-lifespan https://www.saftbatteries.com/energizing-iot/lithium-ion-bat... A thesis who cite many balancing technique https://tel.archives-ouvertes.fr/tel-03584252/document https://tel.archives-ouvertes.fr/tel-03584252/document Another normal advise is not to charge at 100%, not because it's bad in general, the contrary it's NEEDED for a proper cell balance, but on cars have a potential issue, the very same who is an issue for the grid stabilization: when you ask for more power your battery and inverters do their best to give it, but when the demand drop, for instance because you have hit the accelerator then release it, there is an excess of power and on a battery-only system like a car you have no grid to push excess energy to nor you can shut down. As a result you divert excess back to the battery crating high DC ripple effects overheating and stressing the battery itself. > My utility can already turn off my air conditioner during peak demand, why is it harder to turn off a 4000W load when they need more power than to turn on a 4000W battery when they need more power? It's not an on-and-off problem but a how quick such on-and-off can happen. As I suggest try seeing your p.v. system when it works. Try see how the frequency spike constantly with p.v. inverter active and how stable is (normally) on the grid, try to se what happen when you start a big load and when it drop. To see that better, if you have lithium storage try to run exclusively on it+solar and see what happen. AC is veeeery nice for many aspects, but it's hard for others. Try to keep a grid at a certain frequency is NOT an easy business, trying to do so with a gazillion of small generators is next to impossible. Smartness is a modern hope we add in both regulatory capacity for generators and avoid sudden loads spikes because smarter loads can potentially advise generators before starting or stopping and eventually ramp up or down slowly. However so far we are in an uncharted territory with just very little experiments and nothing on scale.