Product Overview

The Bitmain Antminer S19k Pro 115T is the entry-level variant of Bitmain’s S19k Pro series, delivering 115 terahashes per second of Bitcoin (BTC) SHA-256 mining at approximately 23 J/TH efficiency. As with the 120T sibling, the S19k Pro 115T benefits from tighter chip binning on the S19 platform, placing it significantly ahead of the standard S19J Pro in terms of power efficiency while sharing the same well-known S19-series form factor and infrastructure requirements.

The S19k Pro 115T is positioned as the more accessible entry point within the S19k Pro range, offering similar efficiency to the 120T at a lower upfront cost. For operators who prioritise capital efficiency over maximising hashrate per unit, the 115T provides the same J/TH ratio at a lower absolute power draw and unit price.

This is a proven, widely deployed hardware model with strong aftermarket support, third-party firmware compatibility, and a clear place in the S19-era fleet ecosystem. For South African operators building or expanding a Bitcoin mining operation, it represents a balanced option between old-generation efficiency and next-generation pricing.

Key Features

• 115 TH/s hashrate: Entry-level output in the S19k Pro family. Suitable for pool mining contribution without the higher per-unit cost of the 120T variant.
• ~23 J/TH efficiency: At approximately 2645W, the S19k Pro 115T achieves roughly 23 J/TH — the same efficiency class as the 120T but at a slightly lower absolute power draw, which reduces electrical infrastructure strain per unit.
• Air-cooled dual fan design: Identical cooling architecture to the broader S19 family. Standard mining rack deployment — no specialist cooling required.
• SHA-256d algorithm: Mines Bitcoin (BTC) as primary target. Also compatible with Bitcoin Cash (BCH) and Bitcoin SV (BSV).
• S19-ecosystem compatible: Same physical chassis, rack footprint, and power connector type as the S19J Pro and S19k Pro 120T, allowing mixed-fleet deployments without infrastructure changes.
• BraiinsOS+ and third-party firmware support: Compatible with advanced firmware for per-chip autotuning and enhanced efficiency beyond stock Bitmain levels.
• Standard Ethernet (RJ-45) connectivity: Wired network connection for reliable pool communication. Web interface for configuration.

Technical Specifications

• Algorithm: SHA-256d
• Supported coins: Bitcoin (BTC), Bitcoin Cash (BCH), Bitcoin SV (BSV)
• Hashrate: 115 TH/s (±3%)
• Power consumption: ~2645W (±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/50Hz grid supply is fully compatible with the Antminer S19k Pro 115T’s 200–240V input. No voltage conversion is needed.

At approximately 2645W, the S19k Pro 115T is one of the lower-wattage options among high-performance commercial Bitcoin miners. A single unit can be supported by a dedicated 16A circuit (rated 3680W, safely loaded to ~80% = 2944W), though professional electrical assessment and a registered electrician installation are still required. For multi-unit setups, a dedicated sub-board with per-unit circuit breakers is recommended.

As with all Bitcoin ASICs in South Africa, load shedding requires planning. At 2.645 kW, a fully charged 10kWh home battery could support approximately 3.8 hours of operation at full load. This is better than higher-wattage machines but insufficient for extended stage 4–6 load shedding without generator or commercial backup power.

Ensure the installation space has adequate ventilation: clear airflow at both inlet and exhaust fans, and ambient temperature maintained below 40°C. Active air extraction is recommended for enclosed mining rooms, particularly in warmer South African regions.

Electricity Cost Context — South Africa

Running the Antminer S19k Pro 115T at 2645W continuously consumes approximately 63.5 kWh per day, or roughly 1 904 kWh per month. At R2.80/kWh (reference residential tariff — varies by municipality), the estimated monthly electricity cost is approximately R5 331 per month.

Calculation: (2645 ÷ 1000) × 24 × 30 × R2.80 = ~R5 331/month.

The S19k Pro 115T’s 23 J/TH efficiency makes it one of the more cost-effective S19-era machines to operate per terahash of output. While standard residential tariffs still make large-scale home mining economically challenging, operators with commercial tariffs, industrial rates, or renewable energy sources will find the operating cost more manageable. This is an operating cost estimate only.

Ideal Use Cases

• Entry-level commercial Bitcoin mining: A practical starting point for operators building their first commercial-scale mining setup with a modest budget.
• Upgrading from S19 Pro or T19-era hardware: Significant efficiency improvement over first-generation S19 hardware at a fraction of the cost of new S21-series equipment.
• Multi-unit farms where per-unit cost matters: Lower unit price than the 120T means more hashrate per rand of capital invested when buying multiple units.
• BraiinsOS+ firmware users: The S19k Pro platform works well with advanced third-party firmware for operators who want to fine-tune efficiency or hashrate.
• Mixed S19-era fleet expansion: Can be deployed alongside S19J Pro, S19J Pro+, and S19k Pro 120T units without any infrastructure changes.

Frequently Asked Questions

Does the Antminer S19k Pro 115T work on South African power?
Yes. SA’s 230V/50Hz supply is within the miner’s rated input range. A dedicated circuit with appropriate amperage, installed by a registered electrician, is required.

What is the difference between the S19k Pro 115T and 120T?
Both share the same efficiency (~23 J/TH) and chassis. The 115T has 5 TH/s less hashrate and a slightly lower power draw (2645W vs ~2760W). The 115T is the more affordable entry into the S19k Pro range. See: Bitmain Antminer S19k Pro 120T.

Is the S19k Pro 115T a good investment in 2025–2026?
This depends on your electricity tariff and BTC price. At 23 J/TH, it is reasonably efficient for an S19-era machine. Profitability analysis should be done with current network difficulty and BTC price using a mining calculator — this page does not offer profitability projections.

What Bitcoin mining pools work with the S19k Pro 115T?
All standard Stratum-protocol SHA-256 pools: Foundry USA Pool, AntPool, F2Pool, ViaBTC, Braiins Pool. Pool setup is done via the miner’s web interface.

Can I use third-party firmware on the S19k Pro 115T?
Yes — BraiinsOS+ supports the S19k Pro platform and can further improve efficiency through per-chip autotuning. Always verify firmware compatibility before flashing.

What’s Included

• 1× Bitmain Antminer S19k Pro 115T ASIC miner unit
• Power supply unit (confirm with order)
• Power cable (region-specific — South African plug may require local adaptor or electrician wiring)
• Ethernet cable not included
• Quick-start guide