What Rayleigh Instruments does

Rayleigh Instruments Limited is a UK-based manufacturer and supplier of energy monitoring and renewable energy products, founded in 1964 and headquartered in South Woodham Ferrers, Chelmsford. The company operates as a subsidiary of the Raytel Group and serves electrical contractors, renewable energy installers, commercial and industrial building operators, railway rolling stock OEMs, and OEM partners across the UK and select international markets through an approved distributor network. Sales motions combine direct UK field sales engineering, an e-commerce storefront, bonded-stock distribution, and distributor-led international reach, with quote-based pricing across the catalogue.

Name

Rayleigh Instruments

Legal name

Rayleigh Instruments Limited

Website

https://rayleigh.com

Company type

Private

Founded year

1964

Operating status

Operating

Headcount range

11–50 employees

Short description

Rayleigh Instruments is a UK-based manufacturer of energy monitoring and renewable energy products founded in 1964, serving electrical contractors, renewable energy installers, and commercial/industrial customers with current transformers, MID-certified meters, PV inverters, and cloud monitoring software.

Ownership category

akta.pro rank

Product category

Energy Monitoring & Renewable Energy Hardware

NAICS

Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals (334515), Power, Distribution, and Specialty Transformer Manufacturing (335311)

SIC

Instruments For Meas & Testing Of Electricity & Elec Signals (3825), Power, Distribution & Specialty Transformers (3612), Industrial Instruments For Measurement, Display, And Control (3823)

akta.pro primary industry

Metering & Grid Measurement (Smart Meters, CT/VT, PQ Meters) (IMAGAAAH)

akta.pro secondary industries

Instrument Transformers (CTs/VTs) & Sensors (Conventional/Optical) (EUADACAG), Solar Inverters, Power Electronics & MLPE (String/Central Inverters, Optimizers, Microinverters) (EUAMABAE), Renewables Monitoring & Controls (Solar/Wind/Hydro Edge) (EUADAPAF), Power Quality, Metering & Monitoring (HDACAJAG)

Keywords

• Energy monitoring products
• Current transformers
• KWh meters
• PV inverters
• Battery storage solutions

Headquarters

HQ city

Chelmsford

HQ country

United Kingdom

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Personnel, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Hardware Products: Manufacture and sale of energy monitoring and renewable energy products including current transformers, kWh meters, multifunction power monitors, PV inverters, battery storage solutions, communication interfaces. Extensive range held in stock with next-day UK delivery.
2. Software Subscriptions: rayleighconnect cloud-based monitoring software with remote monitoring, control and billing capabilities. Mobile applications available for iOS and Android devices. License-based model with automatic remote billing upgrade available.
3. Professional Services: Commissioning service, site survey and report services. Technical support for installation and operation issues. Credit account facilities available for established clients.
4. Bespoke Products: Custom design and manufacture services including bespoke products for railway rolling stock (door systems, buttons, audible devices, illuminated displays, speed controllers, thermostats). Modification centre enables non-standard product options with minimal delay.

Pricing tiers

Go-to-market motion4 records

Distribution channels4 records

Marketing channels6 records

Core offering

Rayleigh Instruments designs, manufactures and supplies energy monitoring and renewable energy hardware for industrial, commercial and renewable energy applications. Its core catalogue includes current transformers, kWh and multifunction energy meters (including the easywire system), PV inverters, battery storage solutions, micro-grid controllers (RI-TS-175), PV controllers (RI-PVS-125), transducers, data loggers, relays, and switchboard instruments, complemented by the cloud-based rayleighconnect software platform for remote energy data monitoring.

Product overview

Rayleigh Instruments is a UK-based manufacturer and supplier of energy monitoring and renewable energy products established in 1964. The product portfolio centers on a hardware-focused ecosystem comprising Current Transformers (including the patented easywire series with RJ45 connectors), kWh Meters, and Multifunction Energy Meters (available as MID certified versions for billing). The proprietary easywire system enables rapid plug-and-play installation reducing wiring time by 90%, supporting daisy-chaining of up to 32 meters. The rayleighconnect cloud-based software platform provides remote monitoring and control for up to 4096 meters with dedicated iOS/Android apps. For renewable energy, the company offers PV inverters (RI-Energyflow series from 1.6kW to 150kW), battery storage systems (RI-ENERGYSET cabinets from 107kWh to 261kWh with liquid cooling), micro-grid control systems (RI-TS-175), and PV controllers. Additional products include data loggers, measuring transducers, relays, and communication interface modules (GSM/Ethernet). The company also manufactures bespoke products for railway rolling stock including door systems, audible devices, and speed controllers.

Differentiator

Problem solved

Functional benefit

Brands

• easywire: Patented energy meters and current transformers system that reduces installation time by up to 90%, featuring plug-in connectors and RJ45 leads for rapid wiring.
• rayleighconnect

Products and services

• Current Transformers A range of current transformers (CTs) used to sense AC current feeding into energy meters, transducers and switchboard instruments, available as solid-core and split-core variants including easywire-compatible versions for electrical contractors, switchgear builders and OEM partners.
• kWh Meters Single-function kilowatt-hour energy meters in single-phase and three-phase variants, including easywire versions that connect directly to compatible CTs without separate wiring, used by electrical contractors for sub-metering applications.
• Multifunction Energy Meters Multifunction energy meters (RI-D140, RI-F100, RI-F300) measuring kWh, kVArh, kVAh, power, voltage, current, frequency and THD, available in easywire and standard variants with optional communication for BMS/SCADA or rayleighconnect integration.
• easywire Metering System The easywire system integrates Rayleigh current transformers with compatible meters through a plug-and-play interface, eliminating traditional CT-to-meter wiring and reducing installation time for electrical contractors and switchgear installers.
• rayleighconnect Software Platform Cloud-based energy management and meter monitoring software platform providing remote visualisation and analysis of energy data collected from Rayleigh meters and inverters for energy managers, building owners and renewables operators.
• RI-TS-175 Micro-Grid Control System RI-TS-175 micro-grid control system that orchestrates PV generation, battery storage and loads to operate as a controllable micro-grid, intended for renewables installers and commercial/industrial sites with on-site generation.
• RI-PVS-125 PV Controller RI-PVS-125 PV controller that manages photovoltaic system operation, providing commissioning, grid interface, and integration capability for solar PV installations.
• PV Inverters (RI-Energyflow Series) RI-Energyflow series photovoltaic inverters converting DC output from solar PV arrays into AC for grid-tie or battery-coupled systems, offered to renewable energy installers and commercial/industrial premises.
• Battery Storage Solutions (RI-ENERGYSET) RI-ENERGYSET family of integrated battery energy storage solutions combining battery hardware with control electronics, deployable alongside PV inverters and the RI-TS-175 micro-grid controller.
• Communication Interfaces Communication interface accessories (Modbus, M-Bus, Ethernet, wireless) enabling Rayleigh meters and inverters to expose energy data to BMS, SCADA, or the rayleighconnect cloud platform.
• Data Loggers Data loggers for capturing and storing measurements from energy meters and transducers for later retrieval, used in commercial and industrial energy-monitoring installations.
• Measuring Transducers Measuring transducers that convert AC parameters (power, voltage, current, frequency) into DC analogue outputs (typically 4–20 mA or 0–10 V) for building management and SCADA systems.
• Relays Industrial control relays used in conjunction with meters and transducers in switchgear and panel-building applications.
• Switchboard Instruments Panel-mount switchboard instruments including ammeters, voltmeters and frequency meters for indication and local monitoring within distribution boards and switchgear panels.

Quantifiable outcome

• 90% reduction in installation time compared to standard meter and CT installation
• +3 more outcomes

Named customers1 record

Segments5 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Six partnerships are on record, tiered core and minor.

• Raytel Group LimitedcoreOthersParent company providing central services and manufacturing capability for Raytel Group companies including Rayleigh Instruments Limited and Raytel Security Systems Limited. Shared corporate identity and branding.
• Raytel Security Systems LimitedminorStrategic or Co-development PartnerPart of Raytel Group specialising in controlled entry and access systems including door entry, access control, barriers & gates, and CCTV. Shares corporate group resources.
• SGS (Société Générale de Surveillance)coreTechnology or IntegrationUK Test Facility for Certifying Revenue Meters under SGS Annex D. One of very few meter manufacturers with such facility in UK. MID testing and certification partnership.
• BSI (British Standards Institution)coreTechnology or IntegrationNational Standards Body of UK. ISO9001:2015 certification provider (Certificate FS12165). Quality management system certification since 1991.
• DPD (Dynamic Parcel Distribution)minorChannel Partner/ Reseller/ DistributorUK shipping partner providing next working day delivery services. Tracking, email/SMS notifications, and dedicated app available. Used for standard and timed deliveries.
• RENAC (Regional Energy Association Network)coreTechnology or IntegrationPV inverter products branded as 'RENAC by Rayleigh'. Products include RI-EnergyFlow-Mini-R1, RI-EnergyFlow-Macro-R1, and various 3-phase series inverters.

Scale indicators4 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• DEIF: Danish provider of power and energy management solutions including meters, transducers, and micro-grid controllers. Overlaps with Rayleigh's RI-TS-175 micro-grid and transducer product lines.
• Carlo Gavazzi: Swiss-headquartered manufacturer of current transformers, energy meters, and monitoring sensors for industrial and building applications. Closest functional twin to Rayleigh's CT, kWh meter, and modular submetering portfolio, with overlapping installer and OEM channels.
• Socomec: European specialist in energy metering, power monitoring, and switching solutions for commercial/industrial customers. Comparable product breadth in CTs, multifunction meters, and remote monitoring software comparable to rayleighconnect.
• Janitza Electronics: German manufacturer of current transformers, power quality analyzers, and energy management software serving industrial and renewable energy integrators. Highly comparable in measurement/monitoring focus and European mid-market positioning.
• Lovato Electric: Italian manufacturer of energy meters, current sensors, and industrial control products. Comparable CT/meter offering and similar European mid-market distribution-led go-to-market model.

Broad incumbents

• Schneider Electric (PowerLogic/Energy Metering): Global energy management giant whose PowerLogic, Acti9, and EcoStruxure lines compete across CTs, multifunction meters, and cloud monitoring. Far larger scale but addresses the same installer, OEM, and building energy management use cases.
• ABB (Smart Power / Electrification): Global electrification and automation leader with metering, monitoring, and inverter offerings. A much larger incumbent serving overlapping commercial/industrial and renewable energy customers as Rayleigh.
• Eaton ( metering and power quality): Diversified power management company with energy meters, CTs, and monitoring software comparable to Rayleigh's scope, alongside a much broader electrical portfolio.
• SMA Solar Technology: German PV inverter specialist covering residential to utility-scale. Directly comparable to Rayleigh's RI-Energyflow inverter range and offers broader inverter-only depth as a global incumbent.
• Fronius International: Austrian PV inverter, battery, and energy monitoring specialist with SnapINverter and Fronius Solar.web monitoring. Comparable inverter+monitoring product architecture similar to Rayleigh's RI-Energyflow + rayleighconnect stack.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

Compliance11 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Rayleigh Instruments