Free Piston Stirling Generator RS1000
The Stirling engine is an external combustion engine that avoids the explosive shockwork of traditional internal combustion engines. As a result, it achieves high efficiency, low noise, low emissions, and low operating costs.
Unlike conventional generators, the RS1000 Stirling Generator can run on a wide range of fuels- from natural gas, biogas, propane, hydrogen, and coal gas to diesel, LPG, and even solid fuels like wood. It can also harness solar thermal energy. As long as the hot chamber reaches 180°C, the engine begins operating, delivering about 25% electricity and 70% usable heat.
Generator RS1000: Clean, Silent, Efficient Power!
The RIGID Stirling Generator RS1000 is a next-generation free-piston Stirling generator that transforms external heat into clean, quiet, and reliable electrical and thermal energy. With a compact design, minimal maintenance, and fuel flexibility, it delivers up to 1 kW of electrical output plus usable hot water for combined heat and power (CHP) systems.
The RS1000 represents a new era of clean, continuous, and efficient energy generation. Powered by a Free Piston Stirling Engine, the RS1000 delivers up to 1kW of electrical power from any heat source, including natural gas, biogas, waste heat, or concentrated solar energy. Designed for long-term reliability, low maintenance, and superior thermal-to-electric efficiency, it is the ultimate off-grid energy solution.
From Military Technology to Civilian Breakthrough. Originally developed as a strategic military technology, the Stirling engine was designed for resilience, reliability, and silent performance under extreme conditions. Over time, this pioneering innovation has been refined, and RIGID plays a critical role in bringing it into the civilian marketplace. With over 10 years of expertise in Stirling engine design, assembly, and commercialization, RIGID is one of the few companies worldwide capable of civilian mass production of Free Piston Stirling Engines. This positions RIGID not only as a manufacturer, but as a global leader in next-generation energy solutions.
RIGID is working with world-class suppliers to expand Stirling’s role in modern energy ecosystems.
>Solar Combined Heat & Power
>Biomass CHP
>Gas-fired CHP
Today, RIGID Technology bridges the gap between advanced defense and the urgent civilian need for clean, reliable, and distributed energy systems.
Technical Data
- Specification
- Principle
- Features
- Structure
- Application
Key Features
- Fuel Flexibility – Operates on multiple heat sources: natural gas, biogas, propane, hydrogen, diesel, wood, biomass, or solar thermal. This adaptability ensures operation anywhere with available local fuel.
- High Efficiency – Electrical efficiency of 18–25%, and overall combined heat and power (CHP) efficiency up to 95%. Captures waste heat for heating or hot water applications.
- Low Noise Operation – Only 45 dB (with enclosure) at 1 meter; suitable for hospitals, laboratories, and residential areas.
- Long Lifespan & Low Maintenance – Maintenance-free design with no lubricated parts and service life exceeding 80,000 hours.
- Compact & Lightweight – Weighing only 49 kg with a footprint around 450×300 mm, it is easy to install and integrate into existing systems.
- Scalable Modular Design – Multiple RS1000 units can be combined for higher capacity, distributed power, or redundancy.
- Stable Power Output – 1 kW nominal electrical output at 220–230V, 50/60Hz for universal applications.
- Off-Grid Ready – Ideal for remote areas, disaster relief, telecommunications, oil & gas sites, and field laboratories.
- Quiet and Clean – Zero internal combustion engine vibration; no spark plugs or exhaust noise. Environmentally friendly with ultra-low emissions.
- Smart Integration – Easily connects with existing RIGID cooling, heating, or water-harvesting systems to create a fully energy-efficient ecosystem.
Advantages
- Application – Works reliably across diverse environments, from off-grid energy stations to biogas farms, labs, and sustainable buildings.
- Energy Reuse Capability – Converts heat wasted into usable thermal energy for climate control, reducing energy consumption.
- Running Quietly – Suitable for sensitive environments such as aerospace facilities, hospitals, and laboratories.
- Resilient Design – Provides dependable power in mission-critical or disaster-prone environments.
- Eco-Friendly Operation – Enables green energy transformation through hydrogen or biogas utilization.
- Reduced Operating Costs – Long service life and maintenance-free construction drastically lower total cost of ownership.
- Compact Integration – Easily fits within existing infrastructure, HVAC systems, or compact energy modules.
- Scalable Power Network – Modular architecture supports future expansion and hybrid system integration.
- Consistent Output – Independent of weather conditions (unlike solar PV or wind), ensuring stable 24/7 operation.
- Future Technology – Designed for next-generation distributed energy systems and hybrid renewable grids.
The RS1000 operates on the Stirling thermodynamic cycle, converting external heat into mechanical motion, and then into electrical power via a linear alternator. The Free Piston design eliminates friction losses, ensuring exceptional reliability and silent operation. It utilizes helium as a working gas, which transfers heat efficiently while maintaining system integrity even under extreme conditions.
Typical Applications of RS1000 Stirling Generator
- Biogas/biomass CHP
- Remote power systems
- Industrial waste-heat recovery
- Solar thermal electricity generation
- Hotels, hospitals, off-grid homes, and research stations
Beyond the Grid: Smart, Quiet, and Sustainable
Model: RS1000
- Weight: 49 kg;
- Size: 450 × 300 mm
- Electrical output: 1kW
- Power Input: 220-230 V, 50/60 Hz.
- Electrical efficiency: 18-25%.
- Noise: 45 dB with enclosure at 1 m.
- Cogeneration overall efficiency: up to ~95%.
- Scalability/modular networking.
- Designed for long life and low maintenance.
- Suitable for off-grid, remote, disaster-resilient use.
- Fuel-agnostic combustion (natural gas, biogas, propane, diesel, hydrogen, biomass, solar)
Advantage
Application
- Application Examples
- Working Process
- Remote power stations and off-grid homes
- Data centers and telecommunication sites
- Oil & gas field instrumentation
- Medical and life-science laboratories
- Sustainable housing and green buildings
- Agricultural or horticultural climate control systems
- Military and aerospace field operations
- Water harvesting and environmental monitoring systems
The RS1000 operates on the Stirling engine principle – a closed-cycle regenerative heat engine that converts external heat energy into mechanical energy, and then into electricity.
Unlike internal combustion engines, the Stirling generator does not burn fuel inside the cylinder. Instead, it works with external heat sources (such as gas flame, solar heat, biomass, or waste heat).
Heat Energy → Gas Expansion → Mechanical Motion → Electrical Power + Usable Heat
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Heat Input (External Heat Source)
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The engine receives heat from an external source — for example, natural gas, biogas, hydrogen, or solar thermal collectors.
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The heat is applied to the heater head or hot side of the Stirling engine.
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Expansion of Working Gas
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Inside the sealed cylinder, a working gas (typically helium or hydrogen) is contained.
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When the gas on the hot side is heated, it expands rapidly, pushing the piston or displacer to move.
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This expansion creates mechanical motion (linear movement).
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Cooling and Compression
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The gas then moves to the cold side of the cylinder, where a heat exchanger cools it.
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As it cools, the gas contracts, creating a low-pressure zone that pulls the piston back.
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This alternating expansion and contraction form a continuous oscillating motion.
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Regenerator (Energy Recycling)
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Between the hot and cold sides lies a regenerator — a thermal sponge that stores and releases heat between cycles.
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The regenerator greatly improves efficiency by reusing part of the heat energy instead of wasting it.
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Free-Piston Mechanism
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The RS1000 uses a free-piston Stirling configuration (no mechanical crankshaft).
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The piston’s reciprocating motion is transferred directly to a linear alternator, converting mechanical vibration into electrical energy.
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Because there are no bearings or lubricated moving parts, the system runs smoothly and silently with minimal maintenance.
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Electric Power Output
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The linear alternator generates AC electrical power (typically 220–230 V, 50/60 Hz).
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The generated electricity can directly power devices, charge batteries, or feed into a hybrid energy system.
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Waste Heat Recovery (Cogeneration)
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The “waste” heat from the cold side can be reused for heating water, space heating, or driving climate systems.
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This enables overall energy efficiency up to 95% (electric + thermal).
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RS1000 Stirling Generator: Technology & Benefits (3)
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- Converts external heat into electricity using a sealed free-piston Stirling engine.
- Generates power through a linear alternator, without a crankshaft or conventional connecting-rod mechanism.
- The sealed generator design reduces internal servicing requirements; supporting equipment requires appropriate maintenance.
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- Separates the heat source from the generator’s sealed working gas.
- Supports evaluation of natural gas, propane, biogas and suitable waste heat sources with an application-specific burner or heat exchanger.
- Suitable for assessing remote and off-grid power projects, subject to available thermal input, cooling capacity and electrical demand.
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- Generates electricity while allowing heat recovery for useful heating applications.
- Recovered heat can support water heating, space heating or compatible process loads.
- CHP integration can improve overall energy utilization when a consistent heating demand is available.
- Electrical output and recoverable heat depend on operating conditions and the complete system configuration.
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The RS1000 is a compact free-piston Stirling engine generator that converts external heat into electricity (and optionally useful heat). The working gas (typically helium or hydrogen) is sealed inside a closed cycle, heated at the hot end, expands, does work on a power piston/linear alternator, then is cooled at the cold end and the cycle repeats.
Key steps: external heat → gas expansion → mechanical motion → linear alternator → AC output.
Because it uses an external heat source, the RS1000 can operate on a wide range of fuels and heat sources: natural gas, biogas, propane, hydrogen, biomass/wood, solar-thermal, waste heat from industrial processes. This makes it extremely fuel-flexible.
The RS1000 is designed for a nominal output of approximately 1 kW of electrical power (around 220-230 V, 50/60 Hz), making it suitable for small power applications, micro-CHP, remote power modules or integrated systems.
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Free-piston Stirling engine design (no crankshaft or mechanical linkage) → lower maintenance, low noise.
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Fuel/heat-source flexibility (external heat cycle) → broad applicability.
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Cogeneration capability: electricity plus useful heat output (high overall efficiency) → makes the unit highly efficient in combined heat & power setups.
Free-piston Stirling engines eliminate mechanical linkages (like crankshafts, connecting rods) which reduces friction, wear and vibration. This leads to longer life, lower maintenance and quieter operation
Yes. The RS1000’s design allows capturing the “cold-side” or residual heat from the Stirling cycle and redirecting it for space heating, water heating, or other thermal loads, thereby achieving cogeneration (electric + heat) and boosting overall system efficiency.
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Fuel flexibility: you’re not locked to grid power or a single fuel supplier.
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Quiet, low vibration operation → suitable for sensitive sites (labs, remote installations).
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Maintenance-free design with long life → ideal for installations where service access is hard.
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Combined heat & power capability → makes the system more efficient and cost-effective for remote setups.
The RS1000 offers electrical efficiencies in the ~18-25% range and when coupled with heat recovery (cogeneration) can reach up to ~95% overall thermal/electric efficiency in ideal conditions. (These figures align with best-in-class Stirling engine systems.)
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Remote power and micro-grid installations
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Telecom or oil & gas remote field sites
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Life science lab backup or primary power
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Horticulture / climate control systems in agriculture
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Distributed energy systems (micro-CHP) in buildings
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Integration into multi-source renewable energy systems (solar + biomass + waste heat)
Thanks to its sealed and free-piston design with external heat source, the RS1000 operates with minimal mechanical noise and vibration—making it suitable for sensitive installations such as laboratories, hospitals, and heritage buildings where noise or vibration must be minimized.
Because the RS1000 uses a hermetically sealed working gas and has no crankshaft/linkages in the free-piston configuration, maintenance requirements are very low. The design is long-life, low-wear and intended for minimal servicing compared with traditional internal-combustion generators.
The external-heat design means the RS1000 isn’t limited by fuel type internally; it simply needs an appropriate thermal input (of sufficient temperature). This allows switching between or blending fuels (natural gas, biogas, hydrogen) as fuel supply evolves, making the system future-proof and adaptable.
Key considerations include:
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Proper heat exchanger/boiler or thermal input system to provide the required hot-side temperature.
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Cold-side heat sink or heat recovery loop (if cogeneration is used).
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Integration of the AC output into the building/grid or local load.
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Ensuring ventilation or other heat management as required by system design.
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Space requirements: though compact, allowance for thermal integration and service access is needed.
In a micro-CHP configuration, the RS1000 generates electricity while its waste heat is captured for domestic hot water, space heating or process heating. This dual output means the effective energy utilization of fuel is high, reducing both electricity costs and heat generation costs—and improving overall system economics.
Yes — since the RS1000 is driven by external heat rather than internal combustion of a specific fuel, it can be adapted for hydrogen or hydrogen-derived heat sources. This supports future energy transition pathways and integration into emerging hydrogen infrastructure.
Differences include:
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It uses external heat sources rather than internal combustion.
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Sealed working gas (helium/hydrogen) meaning no intake/exhaust of combustion gases.
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Quiet, low-vibration, low-maintenance free-piston design.
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Ability to recover waste heat for cogeneration, increasing overall efficiency.
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Greater fuel flexibility and adaptability.
The three major technical features are:
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Free-piston Stirling engine architecture (minimal moving parts, high reliability)
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External heat source freedom (fuel/heat source agnostic)
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High-efficiency cogeneration capability (electricity + heat, up to ~95% overall).
These features combine to deliver a high-performance, flexible energy solution.
Benefits include:
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Lower greenhouse gas emissions when using renewable or low-carbon heat sources (biogas, hydrogen, solar thermal)
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Efficient fuel usage via cogeneration (less waste heat lost)
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Quiet and clean operation suitable for sensitive environments
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Potential to replace diesel/generator sets in remote/hybrid applications, thereby reducing noise and pollutant emissions.
Key criteria:
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Confirm compatibility with the available heat source (fuel type or thermal input)
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Ensure proper waste-heat recovery architecture if using cogeneration
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Verify electrical output and integration (voltage, frequency, grid vs off-grid)
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Review service/maintenance requirements and lifecycle expectations
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Look for modularity/scalability if future expansion is intended
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Assess noise/vibration performance if installed in sensitive environment
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Ensure manufacturer support, documentation, and integration support.
Emerging trends include:
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Increasing use of waste heat recovery and industrial waste heat as the hot side input.
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Integration with renewable heat sources (solar thermal, biomass, hydrogen) and hybrid energy systems.
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Improvements in free-piston Stirling designs pushing higher power density, lower cost, and longer life.
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The growth of distributed generation, micro-CHP, and remote/off-grid power solutions is driving demand for flexible, high-efficiency units like the RS1000.