They donāt ford water wellā¦ I agree they could though if designed too or modified aftermarket, but yeah, its not good for anything long term, even on boats.
The Tesla packs certainly DO dieā¦ capacity starts to tail off rapidly from 1200 cyclesā¦ whats different with that is till that number they keep 94% capacity, so Tesla just over specifies the packs with extra cells and software limits discharge amount so that the user get the same range and no performance dropoff for greater than the 300,000 miles that represents on a 80ah or bigger pack (hence warranty is till 280k miles, although its bigger brother is unlimited, I suspect this is just because Tesla thinks few people will actually exceed that in the time). However based on their own published works on the cell format, the dropoff of capacity after that is pretty rapid after that.
Donāt get me wrong, for a Model S this is AMAZING. It means the average user never need to change the batteries as the car will be old by the time they wear outā¦ and if not the pack can be swapped with a new one pretty easy. However the car gets away with it because its hugely expensive and its weight was not a binding constraint, for (relatively) smaller batteries or more utilization than driving this limit is far more bindingā¦ I estimated based on Teslaās claimed range for there announced class 8 tractor unit (and the concept the battery weight was binding, so not highly over-specified like the P80 and P100) that its packs would only last a typical day cab truck 2.4 years of typical use. Because we use power constantly when not asleep, unlike at task like driving batteries will be put under this much higher utilization, so correctly specified for load will get even shorter lives than that (although to be clear twice as many cells will live twice as long, this just isnāt a great idea unless the application has fixed life needs, since by replacement time the cells will be cheaper and better).
I donāt personally think batteries in every house are going to (nor should) replace the power grid, not only is there losses in charging and conversion back to mains format, but unlike cars ect which are mobile, they compete with fixed line. Since the batteries have limited life based on use, not only corrosion (unlike a fixed line or oil filled transformer, which can pull full rated current for many decades), and higher costs for a given peak wattage to most typical residential areas, they economically donāt make much sense at the highest level (they can to a consumer because the electrical system is price gouging and bureaucratic right now, but thats not inherent to the system). Also individual battery use doesnāt enable the sorts of management of a bulk grid power storage facility, from having a guy actually clean the panels once in a while to predicatively leaving capacity open or charge based on expected average loads vs renewable overproduction estimations. Even things like upgrades can be done in a more rolling fashion when at scale.
PV solar is also the lowest average stability power source, other renewable like wind tend to spend more than 2/3rds of the time within their median output range, while even tracking panels struggle to do 50% on solarā¦ even in areas basically never overcast night has an impact of making you need more storage than most other solutions, which reduces efficiency. Residential rooftop solar installation is also a huge cause of deaths vs even commercial rooftop installation.
I also like the idea of having centralized fireproof warehouse \ bunkers in industrial areas for bulk batteries, instead of having every house have a bulk amount of toxic compounds to be spread over residential areas in case of a fire, puncture or other damage.