Antminer S21+ Solo Mining Setup Guide
Complete Antminer S21+ configuration guide for solo mining on SoloFury. Pool URL, worker name, firmware settings, and verification.
The Bitmain Antminer S21+ is one of the most powerful SHA-256 ASIC miners available, delivering 235 TH/s at 3,877W (16.5 J/TH). This guide covers how to configure it for solo mining on SoloFury across all 5 supported coins.
Step 1: Access the Miner Web Interface
Connect to your Antminer’s web interface via its IP address in your browser. Default credentials are usually root / root.
Step 2: Pool Configuration
Navigate to Miner Configuration then Pool Settings in the Antminer web UI. Enter the SoloFury stratum endpoint based on the coin you want to mine.
| Region | Stratum host | Ports (primary + 2 failover) |
|---|---|---|
| 🇺🇸 Atlanta | stratum+tcp://bch.solofury.com | 7070, 7071, 7072 |
| 🇩🇪 Frankfurt | stratum+tcp://eu-bch.solofury.com | 7070, 7071, 7072 |
| 🇸🇬 Singapore | stratum+tcp://asia-bch.solofury.com | 7070, 7071, 7072 |
The standard worker format is: Username: YOUR_WALLET_ADDRESS.WORKER_NAME Password: x Pool 1: stratum+tcp://eu-bch.solofury.com:7070 Pool 2: stratum+tcp://eu-bch.solofury.com:7071 Pool 3: stratum+tcp://eu-bch.solofury.com:7072 Worker: bitcoincash:qzREPLACE_WITH_YOUR_BCH_ADDRESS.S21Plus01 Password: x
Step 3: Choose Your Coin
The S21+ can mine any SHA-256 coin on SoloFury. The host prefix changes per coin. For BTC use btc.solofury.com (US), eu-btc.solofury.com (EU), or asia-btc.solofury.com (APAC). For BC2 use bc2.solofury.com. For BCH2 use bch2.solofury.com. For XEC use xec.solofury.com. Each coin has 3 stratum ports (primary plus 2 failover): BTC 6060-6062, BCH 7070-7072, BC2 8080-8082, BCH2 8585-8587, XEC 9090-9092.
Step 4: Firmware Settings
The S21+ runs Bitmain stock firmware by default but is also compatible with several aftermarket options:
- AsicBoost (version-rolling): Enabled by default on S21+. SoloFury fully supports it for 15-20% efficiency gain at no extra cost.
- BraiinsOS+: Open-source firmware, free for SoloFury miners (no devfee). Adds detailed per-chain monitoring.
- VNish / LuxOS: Closed-source firmware with auto-tuning. Both compatible with SoloFury.
- Power mode: Use Normal mode for best reliability. Low-power mode reduces hashrate but saves on energy.
Step 5: Verify the Connection
After saving, wait 1-2 minutes. Check:
- Miner status shows Connected and accepted shares are increasing
- Your worker appears on the SoloFury dashboard (search by your wallet address)
- Zero rejected/invalid shares in the first 5 minutes
- Hashrate matches expected: ~235 TH/s for stock firmware
If any of the above are off, check the Miner Health Check guide for troubleshooting.
Hardware Specifications
| Hashrate | 235 TH/s plus minus 3% |
|---|---|
| Power consumption | 3,877 W plus minus 5% |
| Efficiency | 16.5 J/TH |
| Algorithm | SHA-256 |
| Cooling | Air, 4 custom fans |
| Noise level | approx 75 dB |
| AsicBoost | Yes (version-rolling) |
| Network | 1x Gigabit Ethernet |
| Voltage | 200-240V AC, 50-60Hz |
Next Steps
Once your S21+ is mining successfully:
- Open the SoloFury dashboard to monitor your worker live
- Run a miner health check after 24h to compare actual vs expected difficulty
- For multi-coin operations, consider using profit switching to automatically point at the most profitable coin