Product Overview

The Bitmain Antminer S19J Pro+ 120T is an enhanced variant of the S19J Pro series, delivering 120 terahashes per second of Bitcoin (BTC) SHA-256 mining power. The “Pro+” designation marks a factory efficiency improvement over the standard S19J Pro, achieving approximately 23 J/TH — a notable step down from the S19 generation’s typical 29–34 J/TH range.

The S19 family has been one of Bitmain’s most widely deployed product lines globally, with S19J Pro units forming a significant proportion of current Bitcoin network hashrate. The S19J Pro+ 120T represents the upper end of the S19-era product family, offering operators improved efficiency without requiring the infrastructure investment associated with the newer S21 series.

For South African miners, the S19J Pro+ 120T is a well-documented, community-supported miner with extensive firmware options (including third-party firmware such as BraiinsOS+ which enables additional efficiency gains), making it a practical choice for operators who value ecosystem maturity alongside hardware performance.

Key Features

• 120 TH/s hashrate: Competitive output for the S19-era hardware class, delivering strong pool contribution per deployed unit without the premium pricing of the S21 generation.
• ~23 J/TH efficiency: At approximately 2760W, the S19J Pro+ 120T achieves roughly 23 J/TH — significantly more efficient than earlier S19 Pro variants and the standard S19J Pro (approximately 29.5 J/TH).
• Air-cooled dual fan design: The standard S19-series cooling architecture with dual industrial fans. Compatible with standard mining farm rack setups and 19-inch rack enclosures.
• SHA-256d algorithm: Designed for Bitcoin (BTC) mining, with compatibility for Bitcoin Cash (BCH) and Bitcoin SV (BSV).
• Third-party firmware support: Compatible with BraiinsOS+ and other third-party firmware options, which can further improve efficiency and unlock advanced tuning features not available in stock Bitmain firmware.
• Ethernet (RJ-45) connectivity: Single wired network connection for pool communication. Web interface accessible via local IP for monitoring and configuration.
• Established S19 ecosystem: Extensive global spare parts availability, repair services, and community knowledge base — particularly valuable for operators managing large fleets.

Technical Specifications

• Algorithm: SHA-256d
• Supported coins: Bitcoin (BTC), Bitcoin Cash (BCH), Bitcoin SV (BSV)
• Hashrate: 120 TH/s (±3%)
• Power consumption: ~2760W (±5%) at 25°C ambient
• Power efficiency: ~23 J/TH (±5%)
• Cooling type: Air-cooled, dual high-speed fans
• Noise level: ~75 dB(A)
• Input voltage: 200–240V AC
• Networking: Ethernet (RJ-45)
• Operating temperature: 5°C to 45°C
• Dimensions (L×W×H): 400 × 195 × 290 mm
• Net weight: ~14.8 kg

Power & Installation Notes

South Africa’s 230V AC / 50Hz grid supply is fully compatible with the Antminer S19J Pro+ 120T’s 200–240V input voltage requirement. No voltage adaptor is required.

At approximately 2760W, the S19J Pro+ 120T draws less than many other high-performance miners on this site. While it still requires a dedicated circuit, a properly rated 16A or 20A circuit (installed by a registered electrician) may be sufficient for a single unit, depending on whether any other loads share the same circuit. For multiple units, a dedicated distribution panel with per-unit circuit breakers is essential.

Load shedding impacts this miner similarly to any high-wattage machine: at 2.76 kW, a 10kWh battery inverter provides approximately 3.5 hours of runtime at full load. This is better than higher-wattage units but still insufficient for extended load shedding outages without a generator or commercial backup power.

Thermal management: the S19J Pro+ runs hot and requires clear airflow paths at inlet and exhaust. Ensure the mining environment stays below 40°C for optimal performance. In South African climatic conditions, summer temperatures may require active cooling in enclosed spaces.

Electricity Cost Context — South Africa

Running the Antminer S19J Pro+ 120T at 2760W continuously consumes approximately 66.2 kWh per day, or roughly 1 987 kWh per month. At R2.80/kWh (reference residential rate — municipal rates vary), the estimated monthly electricity cost is approximately R5 563 per month.

Calculation: (2760 ÷ 1000) × 24 × 30 × R2.80 = ~R5 563/month.

This is lower than many other commercial ASIC miners and reflects the S19J Pro+’s improved efficiency versus older hardware. However, at standard residential tariffs, it remains a significant operating cost. Commercial or below-market electricity rates are preferable. This is an operating cost estimate only.

Ideal Use Cases

• Operators scaling capacity on a budget: The S19J Pro+ 120T offers 120 TH/s at a lower price point than newer S21-generation hardware, making it cost-effective for building out farm capacity when upfront capital is a constraint.
• Replacement for older S17 or early S19 hardware: A direct upgrade path for operators running S17 Pro or S19 Pro units, with significantly better efficiency and identical rack footprint.
• Pool mining with stable, predictable income: Works with all major Bitcoin pools for reliable pool-based income. Suitable for operators who prefer steady payouts over solo mining variance.
• Firmware tuners and overclocking enthusiasts: BraiinsOS+ and other third-party firmware options allow advanced tuning of the S19J Pro+, enabling experienced operators to further optimise efficiency or extract additional hashrate.
• Mixed-generation farms: Can be deployed alongside S19 Pro, S19k Pro, and S21-series units without infrastructure changes, as all share standard rack dimensions and power connectivity.

Frequently Asked Questions

Does the Antminer S19J Pro+ 120T work on South African power?
Yes. The 200–240V input is compatible with South Africa’s 230V supply. A dedicated 16A–20A circuit from a qualified electrician is recommended for single-unit installations; multiple units require dedicated circuits or a rated distribution panel.

What is the difference between the S19 Pro, S19J Pro, and S19J Pro+?
The S19 Pro runs at ~110 TH/s at 29.5 J/TH. The S19J Pro runs at ~104 TH/s at 29.5 J/TH. The S19J Pro+ offers improved chip efficiency at ~23 J/TH — a significant reduction in power consumption relative to hashrate, making it the most efficient variant in the S19J family.

Can I use third-party firmware on the S19J Pro+ 120T?
Yes. The S19J Pro+ is compatible with BraiinsOS+, which can improve efficiency by a further 5–15% through autotuning, and enables advanced monitoring features. Check the BraiinsOS compatibility list before flashing.

How loud is the Antminer S19J Pro+ 120T?
Approximately 75 dB(A) — comparable to a loud vacuum cleaner. Not suitable for home living areas. Operate in a dedicated, acoustically managed space.

How does the S19J Pro+ 120T compare to the S19k Pro?
The S19k Pro series (115T and 120T) offers similar hashrate at approximately 23 J/TH, placing them in a closely comparable efficiency class. See: Bitmain Antminer S19k Pro 120T and Bitmain Antminer S19k Pro 115T.

What’s Included

• 1× Bitmain Antminer S19J Pro+ 120T ASIC miner unit
• Integrated or separately shipped power supply unit (confirm with order)
• Power cable (region-specific — South African plug adaptor or direct wiring by electrician may be required)
• Ethernet cable not included
• Quick-start guide