Solo Mine Bitcoin With an Old Antminer S9 or S17

On April 9, 2026, a single mining machine — roughly the power of one 2019-era Antminer S17+ that big farms threw away years ago — solved Bitcoin block 944,306 and walked off with 3.128 BTC, about $222,000. No farm. No data center. One old box, running solo, beating odds of roughly 1-in-100,000 on the day it won. This isn’t a fairy tale — it’s the single best argument for doing something the mining industry told you was pointless: pointing a cheap, “dead” Antminer at the Bitcoin network and pulling the lever.

Key takeaways

• Yes, you can solo-mine Bitcoin with an old S9 or S17 in 2026 — through a pool, with the full block reward paid to your own wallet.
• It loses money on raw economics at normal power rates. The value is a lottery ticket plus a space heater plus a decentralization vote — for a $30–$300 machine.
• Solo wins are routine now: on CKPool alone, roughly one solo block is found every 18 days, including wins on machines as small as 6 TH/s.
• The odds-changing move: point the same hardware at a smaller SHA-256 chain (BCH, XEC). Days-to-weeks odds instead of centuries.
• Run it as a heater you were going to run anyway — cold room, cheap or off-peak power — and the effective cost drops toward zero.

Here’s the 30-second answer. Yes, you can absolutely solo-mine Bitcoin with an old Antminer S9 or S17 in 2026. No, it won’t “pay for itself” the way mining did in 2017 — at normal electricity prices these machines lose money on raw economics. What they buy you instead is three things at once: a real, life-changing lottery ticket, a space heater that happens to mine, and a vote for Bitcoin’s decentralization. For a $30–$300 machine, that’s a remarkable bundle. Let’s break down exactly how it works.

The wins that keep the dream alive

Solo block finds used to be once-a-year curiosities. In 2026 they’re routine. On CKPool alone, solo miners found roughly one block every 18 days over the trailing year — well over 60 BTC distributed, much of it to individuals running a single ASIC at home, per block-tag data compiled by Bitcoin.com. The standouts read like tall tales:

• The S17+ jackpot (April 2026): ~70 TH/s solved block 944,306 for 3.128 BTC (~$222K). Mathematical expectation at that hashrate: around 250 years. It hit in months.
• The 6 TH/s miracle (November 2025): a solo miner contributing just 6 TH/s — about what a worn or underclocked S9 puts out — found block 308 of CKPool’s solo run for roughly $270K. CKPool’s creator pegged that miner’s odds at about 1 in 180 million on any given day. They won anyway, as Tom’s Hardware reported.
• The $281K block (December 2025): block 928,985, 3.128 BTC, found solo and worth about $281,000 at the time.

The point isn’t that any single machine is likely to win. It’s that every block is a fresh, independent draw, and ordinary people keep drawing the winning ticket — even tiny rigs: a 480 GH/s Bitaxe Ultra solved a block in March 2025 against roughly 1-in-1-million daily odds. That’s the nature of a lottery — and old Antminers are the cheapest tickets in the building.

Why “obsolete” hardware is the perfect lottery ticket

Here’s the counterintuitive truth at the heart of this: when you solo-mine, the block reward is the same whether you find it with an old S9 or a brand-new S23. A block is a block. The network doesn’t pay you more for using expensive hardware — it pays whoever solves it, full stop, 3.125 BTC plus fees.

So the real question isn’t “how powerful is my machine?” It’s “how cheap is my ticket, and how many tickets can I afford to leave running?” An old Antminer answers that beautifully: it costs almost nothing to acquire, and it produces real hashes against the real network. You’re buying lottery tickets at a steep discount — and unlike a scratch card, the ticket keeps playing 24/7 and warms your room while it does. (Want a brand-new ticket instead? Our Antminer S23 guide covers the other end of the spectrum.)

S9 vs S17: the spec sheet

These two machines define the budget end of the used market. Here’s what you’re actually getting:

To put efficiency in context: the S17 is about 2.1× more efficient than the S9, but still 1.3× less efficient than an S19 and 2.6× less than an S21. By 2026 standards these are thirsty machines — but for a few hundred dollars of hashpower you intend to run as a lottery ticket and a heater, “thirsty” is a feature, not a bug. One caution on the S17: it earned a reputation for reliability quirks — hashboard solder joints and thermistor failures are the usual suspects, and repair shops rate the S17/T17 as the worst firmware-sensitivity of any Antminer generation — so buy from a seller who tests and, ideally, reinforces the boards.

The honest economics: this loses money (and that’s the point)

Let’s not insult your intelligence. At normal electricity prices, an old Antminer mining Bitcoin runs at a loss on paper. An S17+ pulls about 2,920 W — at $0.10/kWh that’s roughly $7 a day in power, against pennies of expected daily reward. The raw spreadsheet is red.

So why do tens of thousands of people do it anyway? Because the spreadsheet is missing two columns:

• The lottery column. Every day you run, you hold a real ticket to ~$200K+. The expected value is tiny, but the payout is life-changing and the downside is a known, small electricity bill. People pay far more for far worse odds at an actual lottery counter.
• The heat column. An S17 throws off about 8,600 BTU/h — equivalent to a mid-sized space heater. If you’d otherwise be running electric heat in winter, that electricity is not wasted: it heats your room and secures Bitcoin at the same time. Companies like D-Central even sell purpose-built “Space Heater Edition” conversions for exactly this. Suddenly the machine runs “for free,” and any block it finds is pure upside.

Run it as a heater that happens to mine, in a cold room, on the cheapest power you can find — solar, off-peak, a basement you were heating anyway — and the economics flip from “loss” to “free lottery.” That reframe is the entire game. (If heat management is new to you, our cooling guide covers airflow and noise.)

Firmware: stock, or unlock it on GitHub

An old Antminer will mine on its stock Bitmain firmware, but the open-source firmware scene can make it quieter, cooler, more efficient, and frankly more fun to own. This is also where the “it’s open hardware” magic lives — you’re not locked into anything. The main options in 2026:

• Braiins OS+ — the veteran. Per-chip auto-tuning, a low-power efficiency mode, and native Stratum V2, with a roughly 2% dev fee on the plus edition. It supports the S9 (and can underclock one to as low as ~7 TH/s under 500W — the ultimate space-heater setting) and the entire S17/T17 family on Xilinx (Zynq) control boards.
• VNish — the aftermarket workhorse, with fast boot, self-tuning, and up to ~30% power savings. Crucially, it supports Antminers with Amlogic control boards, which Braiins OS+ does not.
• DCENT_OS — the newcomer worth watching, from D-Central: a free, fully open-source firmware written in Rust (GPL-3.0 target), 0% mandatory dev fee, per-chip auto-tuning, Stratum V2, Home Assistant integration, and a genuinely clever PID space-heater mode that throttles hashrate to hold your room at a target temperature. It’s currently in closed beta on the S9 (BM1387) and S19j Pro, with a public beta and S17/S19/S21 support targeted for summer 2026 — promising, but not yet a daily-driver, per D-Central.

One critical compatibility check before you flash anything: the S17/T17 series shipped with two different control boards — Xilinx (Zynq) and Amlogic. Braiins OS+ supports the Xilinx board only; for an Amlogic board you must use VNish (or swap the board). Flash the wrong firmware and you can brick the miner. Always identify your control board first. The S9 is the most firmware-compatible Antminer ever made — a single board type with a universally accessible MicroSD slot.

What are your actual odds?

Honesty is the whole brand here, so let’s be precise. At today’s Bitcoin network size — about 980 EH/s, with difficulty around 134 trillion — here’s roughly how often each old machine would find a BTC block solo, on average:

Read the “daily odds” column and then remember: the S17+ that won in April was facing exactly those ~1-in-93,000 daily odds, and it hit in months. The “average time” is a long-run statistic, not a countdown — variance is the whole story, and variance cuts both ways. We unpack the real math behind this in our Poisson variance guide, and put the odds in plain language in can a tiny miner find a block? (These figures track live network difficulty — check the current numbers on the Network Radar.)

The move that actually changes your odds

Here’s the part most “old Antminer” articles never tell you. You don’t have to point your S9 or S17 at Bitcoin. The same SHA-256 hashpower works on smaller chains where the difficulty is a tiny fraction of Bitcoin’s — Bitcoin Cash, eCash (XEC), and others. On those networks, your old machine’s odds go from “centuries” to genuinely realistic: days to weeks, not lifetimes.

That’s the entire reason SoloFury is multi-coin. Our non-custodial pool lets you point one old Antminer at BTC, BCH, BC2, BCH2 or XEC, with the full block reward paid straight to your own wallet at a 1% fee. Want to see which chain is easiest to hit right now? The live Network Radar shows real-time difficulty and retarget countdowns for every supported coin. For the strategy of which coin to chase with limited hashpower, read the best coins to solo mine in 2026 and our coin selection guide. And if BCH is your target, we have a dedicated how to solo-mine BCH walkthrough.

Setup: from dusty box to hashing in minutes

The flow is the same as any Antminer:

1. Plug in the PSU and Ethernet, power on, and find the miner’s IP on your network.
2. (Optional) Flash Braiins OS+, VNish, or DCENT_OS for tuning, quieter operation, and Stratum V2.
3. Open the dashboard, enter your pool’s stratum URL, and set your own wallet address as the worker — that’s where a winning block pays out.
4. Save, confirm it’s accepting shares, and watch your best-ever share difficulty climb.

Our solo start guide covers the pool side end to end, and the Antminer setup guide walks through the dashboard and worker configuration that applies directly to an S9 or S17.

Verdict: should you do it?

Do it if you find the idea of a $50 machine that could pay out $200,000 irresistible, you have cheap or otherwise-spent electricity (especially heat you’d run anyway), and you care about being one more independent node keeping Bitcoin decentralized. It’s the most fun you can have with “obsolete” hardware, and the SHA-256 altcoin route gives you genuinely catchable odds.

Skip it if you expect reliable profit at retail power prices — that’s not what this is. And if you want quiet, efficient, always-on hashing for a desk, a modern Bitaxe or the Nexus S1 is the better tool. The old S9/S17 is a heater, a lottery ticket, and a statement — buy it knowing that, and it’s one of the best deals in Bitcoin.

Plan your old-rig setup with SoloFury’s free tools

• Solo mining calculator — real odds and break-even for your exact S9/S17 hashrate and power price.
• Profitability tool — compare expected return across BTC, BCH, BC2, BCH2 and XEC.
• Network Radar — live difficulty and retarget countdowns, so you aim your old rig at the easiest chain.
• Start mining — point your Antminer at SoloFury in about two minutes, payouts straight to your wallet.