Stop giving your solar power away.
Use your PV surplus for Bitcoin mining instead of feeding it in: requirements, power costs, hardware. Miners from €299, German stock, 2–4 day shipping.
Use your PV surplus for Bitcoin mining instead of feeding it in for a few cents.
Feed-in vs. Bitcoin Mining
The direct comparison: feed-in tariff or self-consumption of the surplus with an ASIC miner. Instead of roughly 8 cents per exported kWh you use the power in your own miner; what that returns depends on Bitcoin price, difficulty and the efficiency of the unit and changes daily. The Bitcoin mining calculator runs an example calculation with your own assumptions (no guarantee of earnings).
Why Solar Mining?
Four reasons why PV owners choose Bitcoin Mining.
- €0 Electricity When Sun Shines: Use your PV surplus instead of feeding it in for pennies.
- Automatic On/Off Control: Smart plug or energy management starts the miner only when sun shines.
- Heat Recovery in Winter: 3,000W waste heat warms your home – mining as electric heater.
- No Grid Power Needed: Operate exclusively on self-produced power – 100% off-grid possible.
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Feeding in or using it yourself?
Exporting surplus PV in Germany often earns only a low single-digit cent amount per kWh depending on system and commissioning year. The same kilowatt-hour inside a miner produces Bitcoin. What that returns depends on Bitcoin price, difficulty and the efficiency of the unit and changes daily. That is the core of solar mining: replacing a low-paid export with self-consumption.
On top of that, a miner is a perfectly controllable load. It can be throttled or stopped in seconds, needs no inrush current and no flow temperature — more flexible as a surplus consumer than a heat pump, boiler or wallbox.
Sizing the system correctly
As a guide: 1 kWp of PV yields roughly 900–1,100 kWh per year in Germany. A miner at 1.7 kW continuous (e.g. Avalon Q) uses about 40 kWh per day at full load — far more than a small array delivers during daylight. In practice you run the miner on surplus or at part load.
Two designs work well: a small efficient miner running many hours on solar, or a larger unit switched on only around midday. Which is better depends on array size, storage and your consumption profile.
Surplus-based control
Control comes from a smart-meter reading or the inverter interface: the miner is released when surplus is available and throttled when you start drawing from the grid. Braiins OS allows stepped power control instead of pure on/off, which substantially increases usable hours.
Important: miners are most economical running continuously. Frequent cycling costs yield, so with battery storage prefer steady part-load operation over constant switching.
Using waste heat in winter
In winter, when PV yields drop, the maths inverts and the heat matters. A miner converts practically all input power into heat. Using it to warm a room, a workshop or preheat water replaces heating energy and yields Bitcoin as a by-product. This dual use is what makes mining viable at many locations in the first place.
Solar mining FAQ
What result can I expect from PV surplus mining?
The result depends on the Bitcoin price, difficulty and electricity price and changes daily. The calculator lets you run an example calculation with your own assumptions; it is not a guarantee of earnings.
Which miner is best for solar power?
The Antminer S19j Pro (from €299) offers the best entry point. For maximum efficiency, we recommend the Antminer S21 at 17.5 J/TH.
Stocked miners for PV surplus
| Model | Hashrate | Power | Efficiency | Price | Availability |
|---|---|---|---|---|---|
 Antminer S19 J Pro (Used) | 104 TH/s | 3068W | 29.5 J/TH | from €299 | Stock DE · 2–4 business days |
| Antminer S19k Pro 115 TH/s (Used) | 115 TH/s | 2645W | 23 J/TH | from €419 | Stock DE · 2–4 business days |
Facts about buying from Mining Technologies
- Dealer: Mining Technologies (owner: Arthur Reiz), Am Brauhaus 4, 91413 Neustadt an der Aisch, Germany · Since 2021 · over 2,000 miners sold · eBay: 100% positive, 238 items sold (as of 2026-10-15) · 5.0★ Google (43 reviews, as of 2026-10-15)
- Contact: Phone +49 179 4382414, WhatsApp on the same number, email info@miningtechnologies.info
- Shipping: Germany €19.90, EU €29.90 – both free from €1,000 order value. EU islands €49.00. Switzerland €40.00 (import duties are paid by the recipient).
- Delivery time: Stock items ship in 2–4 business days after payment; ex-works models 10–14 days
- Payment & warranty: Prepayment (bank transfer), PayPal, Apple Pay, Credit card (Mollie), Cryptocurrency (NOWPayments); invoice showing VAT; statutory warranty and 14-day right of withdrawal for consumers
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