Thursday I got home at 7:30, and started squaring away a few things. I checked the weather to figure out if I could leave out a package for the mailman the next day, and noticed a giant string of thunder storms to the west (so nope!). 10 minutes later huge straight line winds hit us, I could hear branches cracking in the woods, and then the power flickered and was out.
Power outages happen often enough around here (3-6 times a year), but usually it's 4 - 6 hours, which is annoying but not terrible. The house keeps reasonable temps during this kind of disruption, and the fridge and freezers can float that long if you don't open them. We loose water during that, because we have a well, but we have a rain barrel, so we can pull water to flush toilets easy enough.
However, at 5am, the power was still not back. We have a chest freezer full of meat, fruit, and veggies, as well as everything in our main fridge and freezer. This starts to get into the danger zone where we'd need to dump and waste things. So, after a few Google searches on my phone at 5:50am I was off to Lowe's to make a purchase.
Battery Backup

EGO Power Nexus with 4 batteries attached
I have a lot of EGO electric equipment that runs off their 56V batteries. That includes a lawn mower, snow blower, weed whacker, chain saw, and leaf blower. The packs are all lithium and interchangable. I had seen a couple of years ago that EGO also made an inverter which takes up to 4 of these batteries and turns them into a generator. The retail unit that Lowes keeps in stock comes with 2 additional 56V 7.5Ah batteries (I already owned 3 batteries at that capacity, plus 3 smaller capacity ones).
With 4 of the largest batteries fully charted, connect, you get about 1.5kWh of storage that can do a peak load of 3000W and a sustained load of 2000W.

Energy usage from our Sense energy meter of our refrigerator
Our refrigerator runs at about 1 kWh per day (more or less some days). The chest freeze takes less and is insulated better. But the net of it is that we've got the ability to largely float the house a day if everything is charged up.
But more critically long power outages are typically because it's lots of little breaks. Which means there are lots of places with power. So in the event of a really long outage, once a day I could go to power, charge up the batteries over a couple of hours, and bring those electrons home. Which was the plan I had crafted that morning, and was chilling the chest freezer for an hour before I did, when the power came back on.
Redundancy in Resilient Systems
People say they want a 100% resilient grid, and often complain about that when talking about renewables. In the North east our resiliency problem is trees, which fall during storms. The resilient solution is staring us in the face: bury the lines. Buried lines would drop outages immensely. Instead our utility would rather subsidize gas generators (which run off their gas network, which is buried).
But, I also work in software and the first rule of resilient systems, is that redundancy has to exist at multiple levels, because everything breaks eventually. The grid should be better, but also microgrids, where there is power generation and storage at the community level, and they can operate independently is a great idea. As are redundancy at the home level, like this battery solution. And not every home needs it. Once you get a set of them in a neighborhood, making friends with the neighbors means you can ensure everyone gets through the outage together.
The future is going to have a lot more of this. The Volvo EX90 promises bi-directional capabilities. It has a 111 kWh battery, that's 75 times larger than what I've got in this battery system. It will be able to run the whole house, including the heating system in a deep freeze during the winter, for a day. And then get down to a fast charger and pull back enough electrons to do it again. In the summer, it would go 3+ days outside of a heatwave, 2+ in the middle of one. If I had power I could also easily have neighbors come over and charge up at our house and take the electrons back home.
A better backup strategy
The thing I really love about batteries everywhere, beyond them being less polluting, is they are less noisy. When we first moved in to the neighborhood 20 years ago and there was a power outage in the winter during a storm, it was this kind of quite that you rarely ever get. And then the neighbor across the street put in a loud whole house generator. And then another, and another.
When the power is out now there is a chorus of propane generators booming through the neighborhood. Probably 1 in 4 homes have them. They automatically kick in on an outage. When our house goes out, I step outside, and if I can hear the generators I know it's not just us. Based on the level of din I can tell how extensive the outage was, before the facebook group thread gets rolling.
But, I do look forward to the days where the quiet of the storm comes back. But this time, folks are protected by quiet renewable energy discharging from their backup batteries, keeping them warm and safe while the power company brings back the grid.