Solar system update: I just spent an amount of money that is quite frankly frightening to the likes of me

See, there's a bunch of different ways you can Do Solar, depending on how Into It you wanna get. I'm typically on the raccoon end of the spectrum y'know, scavenge parts and cobble together and try to do it all on the cheap, which would normally rule out the sort of all-in-one inverter/chargecontroller/battery devices that rich folk go for. These are devices where you literally just plug solar panels in, keep your voltage below the max, and it does it all for you with an app, you don't have to know anything.

But. Big part of my use case was, frankly, next time there's a massive storm and half my mates are without power for days at a time and they need their freezer to get cold and their phone to get hot, I wanna be able to chuck a thing in the car, wheel it over, give them a couple cycles and take it back to get charged up in the sun again, and that ain't happening with the sort of screwed-into-a-big-plywood-board system I'd initially been thinking about. Plus I'd saved some money on the actual panels by finding a bloke who's upgrading all his, so the panels I'm getting are gonna be big and old and heavy and blue and not very efficient for their size but very very very cheap.

So. Gulp.

Ecoflow Delta Pro Three

which coincidentally has the same number of words as Two Fucking Grand Christ

So I'm, like, half-raccooning it, cheap panels and expensive battery. I'm not plumbing into the house's main panel, at least not at first, I wanna have the vital loads on the battery and keep it kinda divorced from the house wiring. Later on when I've had some more hands-on practical fiddling I might sell this all-in-one contraption on again and bollock around with, like, separate inverter and charge controller and big chomnky wires and get the biggest crimper I've ever seen rrrrrr yumyumyum, but FOR NOW, this'll do nicely
Step Zero of doing solar panels is to not need much electricity
thirteen cents per kilowatt-hour I pay, on that basis it's fine if my primary PC monitor is one of the old ccfl ones that draws 50 watts, but if I'm the one buying the infrastructure to push the electrons through it then the maths Changes y'know
Well today looks like a lovely day to go and buy sixteen old solar panels off a bloke on the internet

I got 8 solar panels today, gonna go back for the others tomorrow.

The panels were in the woods.

Just, like, big piles of them in the woods. Full of rain and leaves and twigs and creatures.

I mean I guess it makes sense and I don't know what I expected, these machines are weatherproof, they're meant to live outside.

Dude wasn't there when I turned up so I got the car ready and had a look around and got my meter on some wires and yup, they work. These mossy dirty sleeping machines in the woods are silently pushing electrons trying to find something to push them through, not asleep after all, just waiting.

I've never handled a solar panel meant for roof mounting before, only those like little portable camping jobs

These things aren't light and I've got stairs in front of my house, had to carry them up balanced on my head

Ready for a little sit down now

Finding technology overgrown in the woods and deciding to wake it up again is like, my most beloved vibe

Solar update: still waiting for the battery to get here so there's no physical update, but here's minor emotional/noticing update.

1. People (who I know IRL in America and have talked to) generally don't think about kilowatt-hours. When folk look at their electric bill they think of nothing if they're rich and dollars if they're normal and kWh only comes onto the radar if they're having solarpunk thoughts. Nobody knows how much a particular appliance or device uses, people think that a server rack pulls more current than a kettle, this is an entirely normal way to live, the world is full of things and nobody has the spare brain cycles to notice this sort of thing until it comes up. I only notice it because It Came Up. So, a caution to those who might do this, It Will Come Up and then your brain will be filled with It whether you want it or not

2. Having solar panels lying around not hooked into anything is a special sort of liminal airport waiting purgatory because you go ALL THOSE LOVELY PHOTONS ARE JUST HITTING THE DAMN GROUND, look at that smug grass

A hundred watts is a guy and every time I make a cup of tea that's like having eighteen guys in my kitchen pedalling on static bikes hooked up to dynamos sweating while I moan "This kettle takes ages, I miss English kettles that run on thirty guys"

I never mentioned how cheap these panels were. They're 240 watts each, 36V, from 2011 - more modern panels you can get twice the watts in the same space, and that's why this bloke had upgraded and was selling these ones for fifty bucks each cash. $45 to me 'cause I was cheeky enough to ask for a bulk discount.

19 cents a watt is hard to beat.

They still put out over 30v each even in woodsy-light where I checked them. Now that might drop like a rock the moment I get a load across them, they're 15 years old so some of their watts have probably run away by now, but even if these end up being like 25c a watt that's still pretty damn good

I did look into newer panels, you can get them for a great price but you've typically gotta buy ten at a time and shipping would be like $400

A solar array below 1kW doesn't need a permit where I'm at. That's a good thing because I now have Anxiety about how exactly I'm gonna mount these things.

My grasping raccoon hands are dexterous and crafty but there's always a period during any new project where I don't know WTF I'm doing - this period passes as I gradually figure out what exactly TF I'm doing, but it can be very hard to remember that the IDK phase is temporary

Inspections and permits and associated bureaucracy need you to make a plan first and show it to the dudes before they give you the thumbs-up, and how I tend to work is by staring at materials and then bashing stuff together until I've made enough mistakes that I know how not to do it, the friction between these two approaches is part of Anxiety

@ifixcoinops

Neighbours could use your research and buying skills, maybe talk to them and arrange a double order with no shipping?

@ifixcoinops
> I did look into newer panels, you can get them for a great price but you've typically gotta buy ten at a time and shipping would be like $400

Meanwhile here in Germany 800W sets (including the inverter and mounting brackets etc) are typically like 250-300€ on Amazon and in hardware stores, but very often they're on sale for 200€. And from time to time they also pop up in regular supermarkets, also for 200€. So roughly the same price per watt as the ones from 2011 you've got, but with higher efficiency, and inverter thrown in, and none of the watts having ran away.
(The inverters in these sets are often limited to 800W, even when the panels themselves can be e.g. 2x 500W plus 2x 150W on the back side, because by law, you don't need any approvals to install balcony solar, and for feeding up to 800W into the grid, so 800W sets are the most popular.)

@ifixcoinops

Open circuit voltage on a photovoltaic panel is not linearly dependent on irradiance, and not really a good metric, as you intuited.

Check the short-circuit current on them with a millivolt shunt, in full sun. That's a good basic measure of health.

I wonder how long it will take the seller to make his money back from their upgrade (assuming that the coming energy constriction does not become a discontinuity).

My neighbor just upgraded his panels to feed his hungry PowerWall.

@ifixcoinops You might actually be pleasantly surprised with how few of the watts went walkabout. When we bought this place it had an existing 2kW system on it that's old enough that the book for the inverter references Windows XP software to speak to it, and it only just this year stopped peaking at 2kW in full sun, but even then it's only down about 10% from rated power.

So if you're able to throw more panels at it to compensate (inverter spends longer at 100%), they basically last forever.