Are there any of the home battery backup systems that let a homeowner direct buy?

I very much doubt it.

As do I, but I'm still hopeful.

Nothing turn key. You can DIY one.  Look up jehugarcia on YT.

Yeah. That's plan B. I personally don't understand why a person can buy grid tie inverters but not battery systems.

Enphase lets you buy theirs, but you need to do their free online classes to have a warranty.

I can do that. Thanks.

I’ve never done business with Wholesale Solar (now Unbound Solar) but I’ve heard nothing but good things about them.

https://unboundsolar.com/shop/solar-batteries-backup/back-up-power

@jehugarcia

I have tried watching his videos and I don't see any answers on how to build a wall.

His channel is very hard to watch...

He's an electrical engineer....if you've ever worked with any you know what weirdness/oddness bthey tend to have. Details and minutia that would bore an average person to death can be like porn to them.

Diy power wall playlistJehue's PCB based system.

That last one is about as "turn key" as you're gonna get. It'll be larger physically than a tesla wall but it would be safe assuming you put it in a proper enclosure.....though after seeing enough lithium batteries let out the magic smoke I'd want this thing outside of my house, preferably in an out building.

I stay in my lane and only do civil stuff.

I'll see if I can make heads or tails of that stuff.

I'm a mouth breathing knuckle dragging troglodyte.  Once I learned the lingo and was able to understand the calculations it's not as scary as it once was.  Started with some smaller electronics problems first, and worked my way up to battery banks.  FWIW It's not really worth your time recovering old cells unless you're on a strict budget and have a reliable source of cells.  I've got a milk crate's worth I am struggling to find the time/motivation to keep going with.  You can buy cells pretty cheap now.

I would like to pick your brain on how you did yours.

18650s to scooter batteries.... I am not really sure what the hell is going on.

Yeah it's a bit much at first.  18650 batteries are the common go to because they're in a lot of things. Some of the server batteries are actually a better, especially if you

Really what it comes down to is that you need to figure out first what the power demand is for whatever it is you are trying to power. Figure how much run time you want it to go for to determine the battery pack size you need.  Then you figure out how to power your device.  Factor for any inefficiencies (I.E. inverters) and losses (cable lengths and gauges based on voltage)

Don't have a good way to draw out a diagram right now but the long and short of it is
Power source in --> charging controller ---> battery management system --> battery bank --> voltage regulator/inverter --> device you want to power.

Holders for the battery cells can be purchased online, same with the heat shrink. To do it right you need a spot welder and nickle strips. There are solderless/weldless holders with bars but they cost a good bit more. Depending on the project, and size constraints, you may want to buy the welder. Don't try to use a soldering iron/gun.

Additional things you may want temp controlled DC fans to cool the batteries.  Displays with current, voltage, temp, etc.  Various plugs/terminals to hook up everything.  Dedicated smoke detector with fire suppression system (sounds fancy, but it's a solenoid controlled fire extinguisher basically).  Remote monitoring devices (smarthome type stuff) for power draw/charge.

The sky's the limit and you can work on big or small projects. Everything from small electronics to electric skateboards/bikes, motorcycles or vehicles can be done. Just a matter of finding the parts...which for me as a non EE type can be daunting at times.

Do you find this more cost effective than just buying a power wall and going that route?

If you have a cheap source of good batteries yes. Power walls  and batter banks can get away with using older cells compared to EV applications where you want brand spanking new or nearly new cells.

Compared to buying a goal zero, yeah it's worth it. Haven't got a large enough source of batts to try a power wall, but yeah it would probably be 2/3 the cost of the Tesla wall.

Strongly consider lifepo4 batteries

They are ideal for power wall use

I would suggest learning a bit more and building your own; it’s not hard to learn what you need to know for assembly battery packs, balancing cells, battery protection, charger/inverter, etc.

Thats what I will probably do.