FAQ — Frequently
asked questions
Merus Power is a Finnish technology company based in Ylöjärvi, Finland. We design and manufacture innovative battery energy storage systems (BESS) and power quality solutions using our in-house developed technology. Read more
What does Merus Power do?
Merus Power is a Finnish technology company based in Ylöjärvi, Finland. We design and manufacture innovative battery energy storage systems (BESS) and power quality solutions using our in-house developed technology. Read more
Merus® ESS: A lithium-ion battery energy storage system with ultra-fast grid response, modular and arctic-ready design, tailored to applications like grid balancing, peak shaving, and frequency reserve access.
Power quality solutions: Including the Merus® A2-Active Harmonic Filter, Merus® HPQ-Hybrid Power Quality Compensator, Merus® STATCOM, and Merus® SVC, designed to reduce harmonics, improve power factor, and ensure grid code compliance in various applications.
What are Merus Power’s leading solutions, and how do they benefit customers? Merus® ESS: A lithium-ion battery energy storage system with ultra-fast grid response, modular and arctic-ready design, tailored to applications like grid balancing, peak shaving, and frequency reserve access. Power quality solutions: Including the Merus® A2-Active Harmonic Filter, Merus® HPQ-Hybrid Power Quality Compensator, Merus® STATCOM, and Merus® SVC, designed to reduce harmonics, improve power factor, and ensure grid code compliance in various applications.
Merus Power supports installations with commissioning, maintenance, spare parts, technical training, and power quality studies. Our Merus® Services ensure that customers receive maximum value and efficiency throughout their system’s lifespan.
What services does Merus Power offer across the product lifecycle? Merus Power supports installations with commissioning, maintenance, spare parts, technical training, and power quality studies. Our Merus® Services ensure that customers receive maximum value and efficiency throughout their system’s lifespan.
Merus Power delivers Nordic excellence; scalable and modular systems with fast response times. All hardware and software are designed in-house, allowing high flexibility, reliability, and cybersecurity. Read more
What makes Merus Power unique in the market? Merus Power delivers Nordic excellence; scalable and modular systems with fast response times. All hardware and software are designed in-house, allowing high flexibility, reliability, and cybersecurity. Read more
Merus Power is headquartered in Ylöjärvi, Finland. We operate globally and have delivered solutions to over 70 countries across industries, infrastructure, renewables, and utilities. We also have local offices in Germany and the United Arab Emirates.
Where does Merus Power operate? Merus Power is headquartered in Ylöjärvi, Finland. We operate globally and have delivered solutions to over 70 countries across industries, infrastructure, renewables, and utilities. We also have local offices in Germany and the United Arab Emirates.
Merus Power holds certifications for ISO 9001, ISO 14001, and ISO 45001. Our products comply with standards such as IEEE 519, G5/5, and EN 50160, and our active filters are UL 508/CSA listed. Read more
What credentials and certifications does Merus Power have? Merus Power holds certifications for ISO 9001, ISO 14001, and ISO 45001. Our products comply with standards such as IEEE 519, G5/5, and EN 50160, and our active filters are UL 508/CSA listed. Read more
At Merus Power, we guide customers from initial power quality or energy storage needs assessment through business case design to turnkey delivery (EPC), integration, installation, and finally O&M and trading services.
How is a project typically handled from start to finish at Merus Power? At Merus Power, we guide customers from initial power quality or energy storage needs assessment through business case design to turnkey delivery (EPC), integration, installation, and finally O&M and trading services.
- Visit our Contact Us page to find the right person directly
- Fill out our contact form for general inquiries
- Use the form at the end of each product page if you have product-specific questions
- Reach out through our extensive partner network for local support in your country
How can I contact Merus Power?
- Visit our Contact Us page to find the right person directly
- Fill out our contact form for general inquiries
- Use the form at the end of each product page if you have product-specific questions
- Reach out through our extensive partner network for local support in your country
Merus® ESS is Merus Power’s high-power, fast-reacting battery energy storage system (BESS), designed and manufactured in Finland by Merus Power. It combines advanced lithium-ion technology with Merus Power’s in-house engineered Power Conversion System (PCS), Energy Management System (EMS), and control software.
Merus® ESS has a modular and scalable structure, Arctic-grade durability, and high safety and cybersecurity standards. Merus Power offers the Merus® ESS as a turnkey delivery, covering everything from design and engineering to installation, commissioning, and long-term service.
What is Merus® ESS? Merus® ESS is Merus Power’s high-power, fast-reacting battery energy storage system (BESS), designed and manufactured in Finland by Merus Power. It combines advanced lithium-ion technology with Merus Power’s in-house engineered Power Conversion System (PCS), Energy Management System (EMS), and control software. Merus® ESS has a modular and scalable structure, Arctic-grade durability, and high safety and cybersecurity standards. Merus Power offers the Merus® ESS as a turnkey delivery, covering everything from design and engineering to installation, commissioning, and long-term service.
Battery storage systems are the fastest-responding assets on the grid, capable of delivering full power in under a second. This makes them essential for handling sudden fluctuations in supply or demand and preventing blackouts. They allow renewable energy, such as wind and solar, to be stored during periods of surplus and released when generation drops. This improves grid stability, enables the reliable use of more clean energy, reduces peak demand costs, and avoids the need for expensive backup plants or overbuilding of generation capacity.
Merus® ESS delivers these capabilities with exceptional speed and reliability. It reacts in less than 0.1 seconds to grid events, providing critical frequency regulation and storing excess power when production is high so it can be used when demand increases or renewable generation falls. This fast response strengthens grid reliability, reduces reliance on carbon-intensive backup power, and maximizes the value of renewable energy investments.
Why are battery energy storage systems useful? Battery storage systems are the fastest-responding assets on the grid, capable of delivering full power in under a second. This makes them essential for handling sudden fluctuations in supply or demand and preventing blackouts. They allow renewable energy, such as wind and solar, to be stored during periods of surplus and released when generation drops. This improves grid stability, enables the reliable use of more clean energy, reduces peak demand costs, and avoids the need for expensive backup plants or overbuilding of generation capacity. Merus® ESS delivers these capabilities with exceptional speed and reliability. It reacts in less than 0.1 seconds to grid events, providing critical frequency regulation and storing excess power when production is high so it can be used when demand increases or renewable generation falls. This fast response strengthens grid reliability, reduces reliance on carbon-intensive backup power, and maximizes the value of renewable energy investments.
Merus® ESS integrates seamlessly with different technologies, such as microgrids, wind, solar, and hydropower plants. It smooths out fluctuations in renewable output, provides black start capability, enhances power quality, and supports frequency regulation.
How do energy storage systems integrate with different technologies? Merus® ESS integrates seamlessly with different technologies, such as microgrids, wind, solar, and hydropower plants. It smooths out fluctuations in renewable output, provides black start capability, enhances power quality, and supports frequency regulation.
Merus® ESS discharges electricity when the grid needs it, for example, during periods of renewable energy production gaps, peak demand, or sudden frequency deviations. In microgrids, it buffers renewable power and releases it during demand peaks or outages, ensuring reliability and market participation.
When and how is the stored electricity used? Merus® ESS discharges electricity when the grid needs it, for example, during periods of renewable energy production gaps, peak demand, or sudden frequency deviations. In microgrids, it buffers renewable power and releases it during demand peaks or outages, ensuring reliability and market participation.
Merus® ESS achieves system efficiencies of 95–98%. Its in-house engineered Power Conversion System (PCS), Energy Management System (EMS), and optimized outdoor design all contribute to reliable and efficient operation.
Are energy storage systems efficient? Merus® ESS achieves system efficiencies of 95–98%. Its in-house engineered Power Conversion System (PCS), Energy Management System (EMS), and optimized outdoor design all contribute to reliable and efficient operation.
Merus® ESS is designed with strong safety features. It is Arctic-grade, capable of operating in –40 °C conditions, and is built for resilience in coastal and snowy climates. It also meets stringent cybersecurity and physical safety standards, with cooperation from local fire departments and authorities.
Are energy storage systems safe? Merus® ESS is designed with strong safety features. It is Arctic-grade, capable of operating in –40 °C conditions, and is built for resilience in coastal and snowy climates. It also meets stringent cybersecurity and physical safety standards, with cooperation from local fire departments and authorities.
Merus® ESS provides businesses with multiple advantages: lower energy costs through peak shaving, new income from frequency reserve markets, enhanced power quality, and reduced equipment wear. It also enables smoother integration of renewables, strengthening sustainability strategies.
What benefits do energy storage bring to businesses? Merus® ESS provides businesses with multiple advantages: lower energy costs through peak shaving, new income from frequency reserve markets, enhanced power quality, and reduced equipment wear. It also enables smoother integration of renewables, strengthening sustainability strategies.
Yes, it is. Merus® ESS in Valkeakoski, Finland, is the first grid-forming (GFM) battery energy storage system (BESS) in the Nordic region. It meets Fingrid’s grid-forming requirements, provides black start capability, and has successfully passed demanding simulation and site tests. Read more
Is Merus Power’s grid-forming battery energy storage system the first of its kind in the Nordics? Yes, it is. Merus® ESS in Valkeakoski, Finland, is the first grid-forming (GFM) battery energy storage system (BESS) in the Nordic region. It meets Fingrid’s grid-forming requirements, provides black start capability, and has successfully passed demanding simulation and site tests. Read more
Power quality means a stable, clean, and sinusoidal voltage waveform within regulated limits. Poor power quality can damage equipment, shorten its lifetime, cause unplanned downtime, reduce efficiency, and even lead to penalties from grid code violations.
What is power quality, and why does it matter for my business? Power quality means a stable, clean, and sinusoidal voltage waveform within regulated limits. Poor power quality can damage equipment, shorten its lifetime, cause unplanned downtime, reduce efficiency, and even lead to penalties from grid code violations.
Typical signs are damaged or failing equipment, nuisance trips, overheating, flickering lights, low power factor, or voltage imbalance. Many countries have standards such as IEEE 519, G5/5, or EN 50160. If you are out of compliance, you risk fines or restrictions.
How can I tell if I have a power quality problem? Typical signs are damaged or failing equipment, nuisance trips, overheating, flickering lights, low power factor, or voltage imbalance. Many countries have standards such as IEEE 519, G5/5, or EN 50160. If you are out of compliance, you risk fines or restrictions.
The main causes are non-linear loads such as Variable Frequency Drives (VFD), LED lighting, EV chargers, and data centers. Renewable energy sources and decentralized grids also introduce harmonics and fluctuations.
What causes poor power quality? The main causes are non-linear loads such as Variable Frequency Drives (VFD), LED lighting, EV chargers, and data centers. Renewable energy sources and decentralized grids also introduce harmonics and fluctuations.
Merus® A2-Active Harmonic Filters that dynamically correct harmonics.
Merus® HPQ hybrid systems that combine harmonic filtering with reactive power compensation and load balancing.
Merus® SVC and Merus® STATCOM systems that provide large-scale reactive power and voltage control.
What solutions does Merus Power offer for power quality issues? Merus® A2-Active Harmonic Filters that dynamically correct harmonics. Merus® HPQ hybrid systems that combine harmonic filtering with reactive power compensation and load balancing. Merus® SVC and Merus® STATCOM systems that provide large-scale reactive power and voltage control.
Yes. Merus Power’s solutions are scalable and modular, allowing for expansion as your load or processes change.
Can Merus systems grow with my needs? Yes. Merus Power’s solutions are scalable and modular, allowing for expansion as your load or processes change.
Yes. Merus Power offers online sizing tools, including a harmonic calculator and an unbalance calculator. These help you estimate whether you need filtering or load balancing.
Does Merus Power have tools that help me understand my needs? Yes. Merus Power offers online sizing tools, including a harmonic calculator and an unbalance calculator. These help you estimate whether you need filtering or load balancing.
Merus® A2-Active Harmonic Filter cancels harmonics and balances loads, improving power quality. It helps you comply with standards such as IEEE 519, G5/5, and EN 50160. It is scalable, modular, efficient, and easy to integrate into existing systems.
What does an active harmonic filter like Merus® A2 do? Merus® A2-Active Harmonic Filter cancels harmonics and balances loads, improving power quality. It helps you comply with standards such as IEEE 519, G5/5, and EN 50160. It is scalable, modular, efficient, and easy to integrate into existing systems.
Merus® A2-Active Harmonic Filter works much like noise-canceling headphones. It measures distorted current from non-linear loads and injects equal-but-opposite currents. This cancels the distortion, allowing only clean current to be drawn from the grid.
How does the Merus® A2-Active Harmonic Filter actually work? Merus® A2-Active Harmonic Filter works much like noise-canceling headphones. It measures distorted current from non-linear loads and injects equal-but-opposite currents. This cancels the distortion, allowing only clean current to be drawn from the grid.
By stabilizing voltage and reducing distortion, Merus® A2-Active Harmonic Filter prevents equipment trips, overheating, and malfunctions. The result is smoother production, less downtime, and longer equipment lifetime.
How can Merus® A2-Active Harmonic Filter improve my factory’s reliability? By stabilizing voltage and reducing distortion, Merus® A2-Active Harmonic Filter prevents equipment trips, overheating, and malfunctions. The result is smoother production, less downtime, and longer equipment lifetime.
By reducing system losses, avoiding overheating, and optimizing reactive power, Merus® A2-Active Harmonic Filter improves efficiency. That translates into lower electricity bills and reduced maintenance costs.
Will an active harmonic filter lower my energy costs? By reducing system losses, avoiding overheating, and optimizing reactive power, Merus® A2-Active Harmonic Filter improves efficiency. That translates into lower electricity bills and reduced maintenance costs.
Yes. A single Merus® A2-Active Harmonic Filter or several modules in parallel can filter harmonics from multiple 6-pulse drives. This makes it a cost-efficient choice compared to upgrading every drive with active front-end technology.
Can one active harmonic filter handle multiple drives in my system? Yes. A single Merus® A2-Active Harmonic Filter or several modules in parallel can filter harmonics from multiple 6-pulse drives. This makes it a cost-efficient choice compared to upgrading every drive with active front-end technology.
Absolutely. Merus® A2-Active Harmonic Filter is specifically designed for facilities where Variable Frequency Drives (VFDs) are prevalent, such as water and wastewater treatment plants, HVAC systems, industrial factories, and hospitals. It keeps THDi under control and ensures your system stays within power quality standards.
Is Merus® A2-Active Harmonic Filter suitable for VFD-heavy processes? Absolutely. Merus® A2-Active Harmonic Filter is specifically designed for facilities where Variable Frequency Drives (VFDs) are prevalent, such as water and wastewater treatment plants, HVAC systems, industrial factories, and hospitals. It keeps THDi under control and ensures your system stays within power quality standards.
No. Since the Merus A2-Active Harmonic Filter is connected in parallel with your loads, your processes continue to run even if the filter is offline. This makes it more reliable than active front-end drives, where a single fault can cause the system to stop.
What happens if the active harmonic filter fails? Will my production stop? No. Since the Merus A2-Active Harmonic Filter is connected in parallel with your loads, your processes continue to run even if the filter is offline. This makes it more reliable than active front-end drives, where a single fault can cause the system to stop.
Merus® A2-Active Harmonic Filter reacts in microseconds. This ensures stable operation even with rapidly changing or sensitive loads such as welding equipment, elevators, cranes, and medical devices.
How fast does Merus® A2-Active Harmonic Filter react to disturbances? Merus® A2-Active Harmonic Filter reacts in microseconds. This ensures stable operation even with rapidly changing or sensitive loads such as welding equipment, elevators, cranes, and medical devices.
Merus® A2-Active Harmonic Filter is flexible in placement. It can be installed at the main distribution board, at the point of common coupling, or close to specific sensitive equipment, depending on where you need the most improvement.
Where should I install an active harmonic filter in my facility? Merus® A2-Active Harmonic Filter is flexible in placement. It can be installed at the main distribution board, at the point of common coupling, or close to specific sensitive equipment, depending on where you need the most improvement.
Passive filters target specific frequencies and can cause issues such as leading power factor. Merus® A2-Active Harmonic Filter adapts dynamically to varying loads, providing long-term reliability, compliance, and broader coverage for your system.
How do active harmonic filters compare to passive filters? Passive filters target specific frequencies and can cause issues such as leading power factor. Merus® A2-Active Harmonic Filter adapts dynamically to varying loads, providing long-term reliability, compliance, and broader coverage for your system.
Merus® A2-Active Harmonic Filter is smaller, more efficient, and more reliable. Unlike Active Front-end Drives, an active harmonic filter fault will not stop your processes. Merus® A2-Active Harmonic Filter is also more cost-effective because a single filter can cover multiple drives.
How does Merus® A2-Active Harmonic Filter compare to Active Front-End (AFE) drives? Merus® A2-Active Harmonic Filter is smaller, more efficient, and more reliable. Unlike Active Front-end Drives, an active harmonic filter fault will not stop your processes. Merus® A2-Active Harmonic Filter is also more cost-effective because a single filter can cover multiple drives.
Merus® A2-Active Harmonic Filter can operate in three modes:
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- Selectable mode: lets you choose which harmonics to cancel and includes load balancing.
- All harmonics mode: cancels all harmonics and compensates reactive power in real time.
- Harmonics-only mode: cancels harmonics but leaves reactive power untouched.
What operating modes are available for the Merus® A2-Active Harmonic Filter? Merus® A2-Active Harmonic Filter can operate in three modes:
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- Selectable mode: lets you choose which harmonics to cancel and includes load balancing.
- All harmonics mode: cancels all harmonics and compensates reactive power in real time.
- Harmonics-only mode: cancels harmonics but leaves reactive power untouched.
Yes. Merus® A2-Active Harmonic Filter has a standby mode that turns off power electronics when compensation is not needed. This saves energy and extends the service life of the equipment.
Does Merus® A2-Active Harmonic Filter include energy-saving features? Yes. Merus® A2-Active Harmonic Filter has a standby mode that turns off power electronics when compensation is not needed. This saves energy and extends the service life of the equipment.
In simple terms, topology is the way semiconductors are arranged inside the active harmonic filter to generate the compensation current. The two main topologies in the market are 2-level and 3-level NPC (Neutral Point Clamped) topologies. The number of voltage levels determines how precisely the filter can shape its output and the amount of stress the semiconductors experience. More levels mean lower voltage stress, less heat, and better performance.
What does “topology” mean in an active harmonic filter? In simple terms, topology is the way semiconductors are arranged inside the active harmonic filter to generate the compensation current. The two main topologies in the market are 2-level and 3-level NPC (Neutral Point Clamped) topologies. The number of voltage levels determines how precisely the filter can shape its output and the amount of stress the semiconductors experience. More levels mean lower voltage stress, less heat, and better performance.
Merus® A2-Active Harmonic Filter is built with advanced 3-level NPC topology, which is superior to older 2-level designs. It delivers faster reaction and better harmonic filtering, with lower heat losses, smaller components, and higher power density. The 3-level design also creates a cleaner output waveform with less ripple and lower noise, ensuring more efficient and reliable performance.
Why does Merus® A2-Active Harmonic Filter use 3-level NPC inverter topology? Merus® A2-Active Harmonic Filter is built with advanced 3-level NPC topology, which is superior to older 2-level designs. It delivers faster reaction and better harmonic filtering, with lower heat losses, smaller components, and higher power density. The 3-level design also creates a cleaner output waveform with less ripple and lower noise, ensuring more efficient and reliable performance.
Yes. We have numerous Merus® A2-Active Harmonic Filter reference cases across various industries, including water and wastewater treatment, hospitals, and manufacturing. You can explore them here: Merus® A2 references
Are there real-life examples of savings thanks to Merus® A2-Active Harmonic Filter? Yes. We have numerous Merus® A2-Active Harmonic Filter reference cases across various industries, including water and wastewater treatment, hospitals, and manufacturing. You can explore them here: Merus® A2 references