I really wonder if part of the reason this isn’t more widespread is that utilities with variable rate electricity pricing would get burnt on it. Imagine charging during cheap time then dumping 5-20kWh back onto the grid during expensive time. You could have a positive ROI on a vehicle you regularly drive (timing permitting)
No, the main barrier is concern over warranties for the vehicles.
In California, the law requires that vehicles still hold up to 70% of their original charge after 8 years and 75% in the future [1]:
> and d., to deteriorate to less than 70% for a warranty period of eight years or 100,000 miles, whichever first occurs, for 2026 through 2030 model years, and 75% for a warranty period of eight years or 100,000 miles, whichever first occurs, for 2031 and subsequent model years.
The law is unclear on bidirectional charging and whether this would give manufacturers an out. So they're cautious.
In TX, the power producers, distributors, and retail electric utilities are (most commonly) different parties, so the latter two are very much interested in the type of decentralized time-shifting you mention since it smooths wholesale costs somewhat and reduces grid buildout and maintenance.
For EV owners in TX, its not uncommon to have fairly free charging overnight (just paying the distribution costs of 5-6 cents/kWh).
For homes with residential solar and batteries in addition to the EV, you can have essentially free power and EV charging due to time-shifting and incentives.
Residential batteries are still quite expensive, though, so it would be amazing to recruit those in the above EV to time-shift using V2H.
V2H was popular among Japanese Nissan Leaf owners and there were tons of Leafs on cinderblocks with dead batteries used to milk incentives sold on used market for like $1k with 10 mi on the meter. Tiny household sellers are credited for sales for generosity, but apparently often just a noise that needs to be compensated by increasing power output at power plants to then just burn off. Great idea on paper, often not so much in practice.
Why? That's the entire point of moving towards dynamic tariffs. In the systems I'm familiar with the utility company makes money through a fee charged on top of the market purchase/sale price, much like an investment broker.
Maybe. I did the math and in our area a Powerwall would roughly pay for itself over the speced lifespan of the device, IIRC that was just the cost of the device not the cost of installation. I did that calculation ~4 years ago, so maybe it has changed, but definitely do the math, I was surprised.
Why shouldn't utilities pay for this? You're provide grid load balancing. Theoretically their pricing should be considering this? It's not actually free to you since charging and discharging your battery costs money.
But naturally the situation is they want to be the ones paid the big bucks for such services.
Yep, there's pretty much only one rule that matters. You can do anything you want as long as it's to people below you socially. All other rules and laws come second to that one.
Maybe AI will be yet another disincentivized for higher education. When I was considering law school a decade ago, the overwhelming advices from existing attorneys was “unless you’re in the top 10% of the top 10% of universities, you’re wasting your time getting a law degree”. Seems very similar to university today (at least in the USA)
Pfsense and maybe openwrt allow split horizon DNS that allows Wireguard tunnels to work seamlessly whether you’re on or off your home network. Took me years to figure out but it’s what I use now
The only positive outcome I’ve ever heard from a DEI program is being a good hedge against groupthink, and bringing different perspectives that can solve problems more efficiently. But most DEI programs don’t seem to set that as their goal. They typically use a physical characteristic as a proxy for finding “different thought process”, with mixed results.
Is the real motivation for these folks to “work and earn money for the North Korean Government”? It says the proceeds were $3M over 5 years…what’s the value of that at a national scale?
I suppose that for a country that cannot get US$ by legal means, to buy whatever it wants from international markets, instead of getting only whatever Russia and China are willing to barter with it, any amount of revenue in US$ is useful.
I hope the next step for this is plug-in battery storage. All the on-grid battery hybrid inverters I can find in the USA are either single leg 120V or 12kW for $5k. I just want like 3kW dual-leg with support for a dozen kWh of batteries
Yeah it seems like the inverter manufacturers don't see demand for that. I was thinking maybe the Victron Multiplus-II 2x120 could be paired for 240V output but I was wrong, that's only on grid power, it won't make 240V from battery.
Obviously the inverters and pairing technology exist, but I don't know where to buy one retail.
Victron devices on sale in Europe/UK all do 240V output. I've seen someone do a boat build in the USA with Victron hardware that included 240V circuits (because the builder was a UK/US person, and they wanted both 120 and 240 "normal" circuits).
Yeah you can use a Victron 230V inverter along with an Autotransformer to get split phase 240V. Also, I was sort-of mistaken in my earlier comment but can no longer edit it. The MultiPlus II 2x120 cannot make split phase 240V on battery, but I see that the regular MultiPlus II can be paired to do exactly that. About $2K for a setup capable of 240V 20A. Not inexpensive, but it is Victron, which is amongst the best.
I've seen setups where they put a 48v battery between the solar panels and plug-in micro inverter. No idea how this impacts efficiency or if there's any safety concerns though.
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