So you’ve got more solar than you can use. Here’s what nobody tells you to do with it.

If you’ve got solar, you already know the feeling. Sunny afternoon, battery’s full, the house doesn’t need anything — and you can almost watch the extra power just… leave. Off to the grid. For what — like four to ten cents, depending on where you live. And then at night you buy it back at three, four times that.

You probably didn’t think much of it at first. But it nags at you. You put this thing on your roof to be a little more independent, a little smarter with your energy — and here you are basically handing the good stuff back to the utility for nothing.

And you’ve tried things. Well — no assumptions. But a lot of solar owners have tried things. Bigger battery (expensive, and it still tops off by noon). Dump it into the hot-water tank. Run the AC harder. A second freezer in the garage. Buy some gadget just so the power lands somewhere. None of it really sticks. Because none of it is actually using the surplus — it’s just finding new ways to get rid of it. There’s a difference, and you feel it.

Here’s the thing nobody really says out loud. Selling your surplus to the grid was never the answer. It was just the only option anyone handed you. The feed-in rate isn’t a reward for your extra power — it’s the consolation prize for not letting it vanish completely. Off-grid it’s even blunter: once the batteries are full, the surplus doesn’t go anywhere at all. It’s just gone.

There is another use for it. And honestly, it’s the kind of thing that makes you roll your eyes a bit, because it’s Bitcoin mining, and… yeah. Stick with it though, because it’s not the thing you’re picturing.

A miner is just a computer. You point it at power, it does work for the Bitcoin network, and it gets paid in Bitcoin for that work. That’s the whole thing.

The part almost everyone gets wrong at first is picturing the energy getting “used up” and vanishing into crypto. It doesn’t. The miner takes its little cut in Bitcoin, and basically all of that energy comes right back out the other side as heat. It just passes through. Hold that thought — more on the heat in a minute. The point for now: you’ve got cheap power going to waste, and a miner is the one thing that turns that exact problem — too much energy you can’t use — into the thing that makes it work.

Now the objection. You’re probably already thinking it, because it’s all over the forums: mining isn’t profitable, you make like €30 a year, the big farms killed it for normal people. And… true. For almost everyone, that’s completely true.

But here’s why, because the why is everything. Mining comes down to basically one number: what you pay for power. That’s the game. It’s the reason the giant farms win — not magic machines, they just buy the cheapest electricity on the planet. A regular person mining on normal household power can’t compete, because the power cost eats the whole thing.

You’re not a regular person here, though. Just in this one specific way. Your surplus costs you basically nothing — it was going to be wasted. So the one number that kills it for everyone else, the cost of the power, you’ve already taken to zero. On energy that was going down the drain anyway.

There’s no number here like “you’ll make X a month,” because nobody can know your setup, your surplus, your rates — and anyone who hands you a clean number on a page like this is guessing. What’s fair to say is the math stops being a joke the second the power is free. If you want your actual number, there’s a little calculator: you put in your surplus, it does the sum on your kilowatt-hours, not a stranger’s.

Right, the heat. Remember the energy comes back out as heat. That’s the part that quietly makes the whole thing sensible. A bare miner just dumps that heat outside. A data centre actually pays a second time to air-condition it away — energy used once, and wasted twice. It doesn’t have to be like that. In the colder months that heat is heat for your home you’d have paid for anyway: same energy, two jobs out of it. (In high summer, honestly, the heat mostly just dissipates and the Bitcoin’s the point — nobody’s pretending you want a radiator running in July.)

A few honest ones, fast.

The noise. A bare miner, yeah, it’s not quiet. So it doesn’t go in the living room — it goes where your inverter already is. Garage, utility room, basement. Out of earshot. There are quieter “silent” ones if space is tight.

The “this sounds complicated” one. That’s the hang-up for most people. There’s a little controller called Port that watches your solar and your battery and flips the miner on when there’s surplus, off when there isn’t. You don’t babysit it. It’s the automatic switch people keep asking for on the forums.

And the big one — whether this is a scam, and who you’d even buy from. Fair. Honestly: made in Austria, built and repaired in the EU (nothing shipped off to China), 30-day returns, real people answering emails in a couple of hours, strong reviews on Trustpilot. Boring, checkable stuff. In this corner of the internet, boring is exactly what you want.

If you want to actually try this, don’t go big. The whole point is you’re putting nearly-free power to work, so start small — a modest refurbished machine, watch how it behaves with your setup, scale up once you trust your own numbers. People on the forums tend to start with a downclocked used S19 for a few hundred euros (currently from €890,00 here). That’s a sane first step, not a leap. Pair it with Port (€189,00) so it only runs on your surplus, and you’re basically done.

Here’s the picture, if it lands. Same roof. Same panels. Same sunny afternoon. Except now the extra doesn’t just leak off to the grid for pennies — it runs through something useful on its way out, takes its cut, and the rest you keep. You went solar to stop wasting energy. This is just… finishing the job.