I've parked mine outside in the Australian summer. It didn't magically lose energy. The battery is a dense insulated brick on the bottom of the vehicle, so it doesn't really get hot enough to need cooling even when it's 40C / 104F and you park in the sun.
You can drain the battery in a few weeks, but you need something running like Sentry Mode consuming power.
I'm not saying building your own home filling station is impossible, just that it's probably really expensive and a terrible idea.
What? Of course you can store power for weeks. It doesn't just dribble out onto the floor. Go away for a month and come home, your EV is still sitting there with the battery charge whatever you left it on.
Yes, EVs use their stored energy for driving... I'm not sure what your point was there. Do you think transporting hydrogen is free and doesn't cost energy?
I'm not sure if you're aware of this, but hydrogen fuel cell vehicles do have batteries. You can't put energy captured from regen braking back into the fuel cell, so either you have a battery or you lose a third of your range.
Fuel cell EVs can't be fitted with charging plugs for religious reasons.
Hydrogen was the future in the 90s, when the alternative was lead acid batteries. Nowadays hydrogen fuel cell cars don't actually top the charts on range, battery EVs have taken the crown.
Hydrogen promised to be a drop-in replacement for fossil fuels. You still needed big industry to make and distribute it, you still needed filling stations to sell it to end users, you still took your car somewhere to fill it up. Everyone could just keep doing their thing. But it was going to be so expensive to switch over that everyone dragged their heels and kept using fossil fuels, so now we're entering the post-hydrogen car era without it ever arriving.
If we'd had hydrogen fuel cell cars 30 years ago, today we'd have manufacturers putting bigger batteries and charging plugs on them to make plug-in hybrids and move away from expensive hydrogen.
Trucks and trailers aren't new, it's the filling and emptying facilities combined with the sheer number of trucks.
Trucks can't hold very much hydrogen gas - you need a lot of trucks to transport a useful amount of hydrogen. One truck only carries enough hydrogen to fill 75 cars, so you're looking at needing fourteen times as many hydrogen trucks as we have fuel trucks. If filling stations were actually busy, you'd be looking at multiple deliveries per day.
All that infrastructure, trucks and drivers costs a lot of money.
I remember hearing back during lockdown that sales of pants had tanked but sales of business shirts were as strong as ever.
Transporting energy isn't possible with grid power? Really? That's what grids are for.
Yes, they have the issue of separate incompatible grids, but building complicated interconnects is still going to be easier than building and operating a hydrogen trucking industry.
They don't just... leave it off. They turn it off for like 15 minutes in the middle of an 8 hour charging session. Nobody notices or cares.
So what I’m hearing is, if I build my own electrolysis station driven by a solar panel array, there’s quickly going to be a glut of extremely cheap hydrogen cars coming out of So.Cal…
That's the fun thing - after you make the hydrogen you have to compress it to 10,000 PSI and cool it to -40 to actually get it into the car. And make sure the pumps, pipes and cooling gear are all made of materials that won't be destroyed by exposure to high pressure hydrogen.
It'd probably be a lot cheaper and easier to gut the car and replace the fuel cell and tanks with batteries and a charger.
You can do off-peak charging with EVs too, that's not a magical hydrogen thing. My hot water system is on its own circuit which can be turned off by the power company whenever they need to cut demand, providers have been doing that sort of thing for decades.
I'm not sure if you know this, but there are smart chargers that include a sensor to put on the feed going into your house. The charger can throttle up and down as you turn stuff on and off to keep the house's total power draw under the limit, so you run all your stuff and the car just gets whatever's left over. You can even have dozens of chargers in a parking garage and program the chargers to share a limited grid connection.
EVs aren't a fixed load, you can ramp them up or down or shut them off as needed, so they're pretty easy to accommodate.