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Beyond The kWh: Factors That Bitcoin Miners Need To Consider

Jon Hartney by Jon Hartney
July 15, 2022
in Bitcoin, Blockchain, Business, Market
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Beyond The kWh: Factors That Bitcoin Miners Need To Consider
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KWh aside, there are other important factors for miners to consider in both the choosing of their machine and the operational decisions they make.

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A Decision-Making Framework For Bitcoin Miners — What Various Whatsminer Models Tell Us

The bitcoin mining space is rife with anecdotes, best practices and old wive’s tales about ideal operating conditions for ASIC computers. Beyond this, the market is only beginning to discuss environmental factors, contracting and alternative cooling mechanisms. For example, newer market entrants like MicroBT Whatsminers and their various M30S ASIC models are often seen as excellent hardware, but are comparatively under-studied relative to market competitors. In this paper we review empirical data generated via API query across multiple models of Whatsminer M30S to begin answering the broader ASIC question, “How do I make intelligent decisions around self-mining and/or hosting my machines?”

This data should be viewed as the beginning of a conversation around ASIC optimization and not a series of hard and fast rules for operating machines or facilities.

Distributed hash research is dedicated to studying the mining ecosystem and producing content that empowers miners of all sizes and experience levels. For project consultation, hosting, or general inquiries, please email [email protected]

Notes On Miner Data

The following data was collected in a dry, Western environment at an altitude of over 4,000 feet, but below the manufacturer recommended maximum operating altitude of 6,561 feet (2000 meters) for most new generation miners. Data was collected via API query in a single air-cooled datacenter across multiple weeks. Temperature conditions varied between a high of 94.3 F (34.62 C) midday and 41.2 F (5.1 C) in the evenings. Precipitation was 0.22 inches over the period of data collection with humidity between 93% and 15% (average 49%).

Miner Decision-Making: Rates, Hosting And Contracting

Bitcoin miners are taught to consider kWh as the golden number. The sacred kWh is often the single vector of decision-making when deciding when and where to mine. However, as experienced miners will attest, cheap energy is only meaningful when 100% machine uptime is assumed. Additionally, for miners who host their machines with third parties or have signed power purchasing agreements with mandatory minimums or fixed consumption agreements, these contracts are only cost-optimized when uptime is near maximized.

Considering only kWh when mining or hosting is both naive and financially reckless.

Imagine hosting a new generation miner for an agreed upon 6.5c/kW. Your bill starts at $154 per month, plus most companies have additional fees that can push your bill closer to $200 per month per miner (so you’re already at an effective rate of 8.6c/kW before you power up). However, that’s not all that influences your effective kWh rate. The overall uptime of your machine or facility and the way those terms are contracted is, especially these days, becoming a large factor in profitability.

If you’re contracted to pay a fixed $200 per month on your machine (we assume a hosting provider has a cheaper rate per kWh than 6.5c and makes money on the spread). What happens when a heatwave rolls through your state? A provider, or you, powering down your machines 50% of the time while you pay a fixed $200/mo to generate sats via your chosen pool effectively doubles your cost of sats production to over 17c/kW.

Outside of contract issues, uncontrollable factors such as environmental conditions, grid level supply issues (not to mention unexpected geopolitical upheaval) can invert even the most optimal contract for cheap kWh and leave operators hemorrhaging money with no recourse. What’s more, these factors come before consideration of macro bitcoin market conditions such as difficulty and price.

In the future, we hope to provide additional tools for miners to better navigate their hosting agreements, facility operations and external environmental conditions to maximize their sats production and minimize their risks.

Heat, Modes, And Downtime In Whatsminer M30s Models

Ambient heat poses a significant challenge to current air-cooled ASICs.

All miners should consider geography, altitude, humidity, and temperature when choosing which machines to purchase and operate. We look particularly in the following data at various Whatsminer M30S ASICs (M30S 86T, M30S 92T, M30S+ 102T, and M30S++ 106T) and have a few broad suggestions regarding which machines are optimal in environments that are subject to high summer heat.

Consider the above capture of machine-reported environmental temperatures over a five-and-one-half-day period. You will notice a general sine wave pattern reflecting the heat of the midday and the cool of the night. There is a more general cooling effect for the first three days, followed by a number of hot days in quick succession. Additionally, notice how machine-reported environmental temperature towards the right-hand side of the chart becomes more chaotic as ambient temperature increases overall.

A series of hot days are what pose the most serious risk to miner operation. During peak heat hours miners will automatically reset or switch to idle until the ambient temperature cools sufficiently to resume regular hashing. Consider the capture on the following page of four days of miner data with terahash reported on the upper lines and temperature reported on the lower lines. At roughly the same ambient temperature each day a series of machines in this subgroup will overheat and drop hash power until the ambient temperature decreases sufficiently. In the aggregate this is a substantial amount of downtime with negative outcomes for miners on fixed contracts.

Note: This is why distributed hash chooses to bill our hosting clients only on power consumed. This protects the miner from predatory contracting and becoming massively unprofitable during tighter market conditions.

So how can a miner maximize uptime in the most punishing midsummer environments?

Whatsminer machines have the option to toggle between “low,” “normal,” and “high” power modes. The vast majority of the time miners will choose to run their machines in
normal mode, which most closely delivers the TH listed on the machine at the stated wattage. However, during times of high heat it becomes preferable to run your machines in low mode, which, by decreasing the effective wattage of the machine, gives an additional ambient temperature buffer to the hash boards. Consider the below capture over five days showing a series of miners switching from normal to low mode on June 18 and the subsequent elimination of machine overheating.

The effect of switching the M30S ASICs into low mode from normal mode is obvious. No machines overheat during peak temperature days as the lower wattage draw has added an ambient temperature operating buffer. This switch to low mode has proven to be an effective remedy to midday overheating, but miners wonder how much hash they are losing by doing so. The answer is a discussion around chip manufacturing and PSU efficiency that is outside of the scope of this current paper; however, we submit the below data to open the conversation around various models of Whatsminer M30S ASIC:

As you can see in the above chart, when machines are switched from normal to low mode there is a general trend that goes: drop in hash power, larger drop in wattage, increase in watts per terahash. This is intuitive, as the less energy is consumed by a miner the efficiency of the miner increases. Increasing heat int a system will introduce some inefficiency.

What is most intriguing is how a drop in hash on low mode does not correlate directly with wattage across all variations of machine. Note that the highest powered new generation machines, the M30S++ series, remain largely stable in both normal and low mode. This suggests that you can run your top end machine in low mode, gain a temperature buffer for ambient conditions, and still hash within 2Th of the rating of the machine (104.27 actual versus 106 rated). On the other end of the spectrum, the M30S machines, specifically the 92T rated M30S machines, display a substantial non-linear variation in hash and wattage when switched from normal to low mode. For the miner using these machines, it suggests that mode switching should be considered during competitive markets or high ambient temperatures when the efficiency gain is meaningful to sat generation. We speculate that the differences between efficiency in the M30S 86T and M30S 92T ASICs are a consequence of the chip manufacturing process (an assertion outside of the scope of this discussion but interesting nonetheless and worth future study). Finally, the middle of the pack, the M30S+ machines, show efficiency gains that fall directly in the middle of the lower end M30S machines and the top end M30S++ machines.

The final question miners must have is when to switch between modes given certain prices and operating kWh conditions to maximize efficiency of their machines. We have prepared the larger model below, which takes into account various bitcoin price points at various electrical prices for you to determine how to run your personal machines.

Consider the below as rough data aggregation with the intention of optimizing the amount of bitcoin you’re able to generate during tight markets. During clear bull markets the best option is generally to operate at the highest recommended wattage draw of your machine.

If you would like a higher resolution version of this image, please contact us at [email protected].

Conclusions

In summary, we began by considering the risks associated with using kWh as a single determining metric when operating ASICs. It is important to look into not only the terms of your contract with either your utility or hosting entity, but to also consider the political and geographical risks associated with hosting in certain jurisdictions or climates. There are no hard and fast rules for how to run X miners in Y location, but introducing these factors into the conversation will serve miners in making better decisions.

We continued by reviewing datacenter level figures around ambient variations in temperature and how midday heat can drastically increase miner downtime. We assert that running machines in low mode is the best option to mitigate this threat and continue with an in-depth analysis on a per-machine level to better understand what the nominal terahash losses are, versus efficiency gains measured in watts per terahash.

We found that the highest tier Whatsminer M30S++ machines demonstrate incredibly stable operation across various modes, while the higher terahash M30S machines (92T) demonstrate the highest watt per terahash efficiency gain when switched to low mode. We end our discussion by sharing a more comprehensive table of efficiency per machine across various prices per kWh and bitcoin prices to better educate miners around when to change operating modes.

We hope that you have found this data and the surrounding discussion informative and are better able to strategize around your particular mining operation. Whether you are a backyard miner or a client of a hosting facility, the more information you have around your particular operating situation, the better able you will be to navigate market conditions and advocate for yourself.

Knowledge is power.

-distributed hash team

This is a guest post by Colin Crossman and Robert Warren. Opinions expressed are entirely their own and do not necessarily reflect those of BTC Inc. or Bitcoin Magazine.

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