Carter Sullivan

What Carter Sullivan does

Carter Sullivan is a UK-based critical power engineering specialist, founded circa 2005 in Sharnbrook, Bedfordshire, that designs, supplies, installs, and maintains Uninterruptible Power Supply (UPS) systems, standby generators, and battery solutions for enterprise and SME customers. Its core technology covers single-phase and three-phase UPS systems ranging from 10kW to multi-megawatt capacity, supported by custom containerised UPS solutions and 24/7 battery monitoring, with installations using partner-manufactured hardware from the likes of Eaton, Riello, Kohler, Schneider Electric/APC, Yuasa, Exide, Enersys, and FG Wilson. The company operates from a headquarters in Sharnbrook with a fleet of vans and employs 32 staff, including 18 field service engineers, and runs a dedicated training academy (CS Learning) offering City & Guilds-accredited courses.

The company serves data centres, life-safety systems (lifts, fire alarms, sprinklers, smoke extraction), commercial and industrial facilities, and SMEs across sectors including data centres, healthcare, finance, government, transport, and aviation. Named customers include Amdocs, AEM, Northamptonshire Local Authority, the London 2012 Olympics, Capita, The National Gallery, Technicolor, Spreadex, and a regional UK airport. Revenue is generated through hardware sales, professional installation services, recurring maintenance contracts, UPS hire, training services via CS Learning, and an all-inclusive UPS Subscription product called Future-Proof Protection that bundles equipment, installation, maintenance, repairs, battery replacements, upgrades and 24/7 emergency response into a fixed monthly fee. Go-to-market is exclusively direct enterprise field sales, supported by content marketing, SEO, LinkedIn, and detailed case studies; pricing is fully quote-based with no public tiers.

Name

Carter Sullivan

Legal name

Carter Sullivan

Website

https://cartersullivan.co.uk

Company type

Private

Founded year

2005

Operating status

Operating

Headcount range

1–10 employees

Short description

Carter Sullivan is a UK specialist in critical power engineering, designing, installing, and maintaining UPS systems, generators, and battery solutions for data centres, life-safety, commercial, and SME customers. It operates recurring maintenance contracts, hire, and an all-inclusive subscription model, supported by City & Guilds-accredited training.

Ownership category

akta.pro rank

Product category

Critical Power Infrastructure Services

akta.pro primary industry

Uninterruptible Power Supplies (UPS) (HDACAJAA)

akta.pro secondary industries

Power Distribution & Switchgear (UPS, PDUs, Busway) (HDABAKAA), UPS Systems & Backup Power (Online/line-interactive UPS, industrial backup) (IMAGADAD), UPS Accessories & Monitoring (Network Cards, Software, Sensors) (HDACAJAF), Replacement Parts, Maintenance & Service (UPS/Power Protection) (HDACAJAH), Power Quality, Metering & Monitoring (HDACAJAG)

Keywords

• UPS power protection
• Critical power systems
• Battery backup solutions
• Standby generator services
• Power infrastructure maintenance

Headquarters

HQ city

Sharnbrook

HQ country

United Kingdom

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. UPS Equipment Sales: Sale and installation of UPS systems, generators, and batteries tailored to customer requirements. Revenue from equipment supply, site surveys, project management, and commissioning.
2. Installation Services: Expert installation services including site surveys, load assessments, cabling, positioning, integration, and commissioning. Delivered by NICEIC-accredited engineers.
3. Maintenance Contracts: Planned UPS maintenance agreements covering battery checks, component servicing, firmware updates, and proactive issue resolution. Ongoing revenue from service contracts.
4. UPS Hire: Flexible UPS rental service ranging from small-scale kW units to containerised UPS systems with various battery runtimes. Delivery and installation within a week.
5. UPS Subscription (Future-Proof Protection): All-inclusive monthly subscription covering UPS systems, generators, batteries, installation, maintenance, repairs, battery replacements, future upgrades, and 24/7 emergency response. Fixed affordable monthly fee.
6. Training Services (CS Learning): City and Guilds-accredited training programmes including battery installation courses and critical-power engineering certifications.

Pricing tiers

Go-to-market motion3 records

Distribution channels1 record

Marketing channels5 records

Core offering

Carter Sullivan sells and services critical power protection systems, primarily UPS (Uninterruptible Power Supply) units, standby generators, and batteries from leading manufacturers such as Eaton, Riello, Kohler, APC, Yuasa, Exide, and Enersys. The company supports these products with full-lifecycle services including site surveys, installation, maintenance contracts, hire, battery monitoring/testing/replacement, and an all-inclusive monthly UPS Subscription. It serves data centres, life safety, government, healthcare, finance, and industrial customers across the UK.

Product overview

Carter Sullivan is a critical power engineering company offering a comprehensive portfolio of power protection products and services. The core product range includes Single Phase UPS, 3 Phase UPS, Generators, and Batteries. These are supported by a full-service capability spanning installation, maintenance, hire, and subscription options. The company also delivers targeted solutions for Life Safety (lifts, fire alarms) and Data Centres, plus specialist battery services including monitoring, testing, and replacement. Customers can purchase individual products or opt for fully managed subscription services bundling equipment, installation, maintenance, and repairs into a single monthly payment.

Differentiator

Problem solved

Functional benefit

Brands

• CS Learning: City and Guilds-accredited training division of Carter Sullivan, offering UPS training courses and critical-power engineering programmes including the City & Guilds Assured Battery Installation & Maintenance Course (BIMC). Located in Bedford with state-of-the-art training facilities including batteries, bypass switches and fully operational UPS systems.

Products and services

• Single Phase UPS Single-phase UPS systems provide reliable backup power for smaller sites and individual pieces of equipment, tailored to specific load capacity, runtime, and environmental requirements.
• 3 Phase UPS Three-phase UPS systems deliver robust, uninterrupted power for larger sites and high-demand equipment, featuring load balancing, redundancy, and tailored designs for maximum reliability (200kW to multi-megawatt capacity).
• Generators Standby generators providing reliable long-term power during extended outages or failures, available from approved partners with expert supply, installation, and ongoing maintenance.
• Batteries UPS batteries including lead-acid and lithium-ion options supplied from partners Yuasa, Exide, and Enersys, providing backup power to protect data and equipment.
• UPS Installation Expert UPS installation service from initial site survey to full project management and commissioning, delivered as official partners of major UPS manufacturers.
• UPS Maintenance Planned UPS maintenance agreements with NICEIC-accredited engineers delivering tailored service plans to keep power systems running reliably year-round.
• UPS Hire Flexible UPS hire solutions ranging from small-scale kW units to containerised UPS systems, with delivery and installation within a week for short-term needs.
• UPS Subscription (Future-Proof Protection) All-inclusive UPS subscription covering systems, batteries, generators, installation, maintenance, repairs, upgrades, and 24/7 emergency response for a fixed monthly fee.
• UPS for Life Safety Specialised UPS systems for life safety equipment including lifts and fire alarms, designed for BS EN 81-1, BS 8519, and BS EN 62040-1 compliance.
• UPS for Data Centres Large-scale three-phase UPS systems from 200kW to multi-megawatt capacity for data centre environments, supporting N+1, 2N, or bespoke redundancy configurations.
• Battery Monitoring 24/7 battery monitoring providing continuous insight into battery health, tracking voltage, temperature, charge levels, and overall condition with real-time alerts.
• Battery Testing Battery testing services assessing condition, capacity, and performance to identify potential issues before they cause downtime or system failure.
• Battery Replacement Expert battery replacement services with strategic planning, responsible disposal, and high-quality compatible units installed to industry standards.
• CS Learning Training City & Guilds-accredited training programmes including UPS training, critical-power engineering courses, and the specialist Battery Installation & Maintenance Course (BIMC), delivered at a state-of-the-art training centre in Bedford.

Quantifiable outcome

• Data centre load fully supported within 24 hours with zero downtime
• +4 more outcomes

Named customers12 records

Segments4 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

Eight partnerships are on record, tiered core.

• EatoncoreTechnology or IntegrationOfficial partner relationship with Eaton for UPS systems. Carter Sullivan has delivered multiple projects using Eaton equipment including 93PM UPS units. Eaton provides endorsement: 'We are continually impressed by the service levels delivered by Carter Sullivan.'
• RiellocoreTechnology or IntegrationOfficial partner for UPS equipment including Master HP and MPW series UPS systems. Multiple case studies feature Riello UPS installations.
• KohlercoreTechnology or IntegrationApproved partner for Kohler generator supply. Provided 110kVA standby generator for airport fire station installation.
• YuasacoreTechnology or IntegrationBattery manufacturer partner known for reliability, innovation, and performance. Yuasa batteries used in life safety applications including 3-hour autonomy systems.
• ExidecoreTechnology or IntegrationBattery manufacturer partner providing reliable power solutions for critical systems.
• EnersyscoreTechnology or IntegrationBattery manufacturer partner known for reliability and performance in UPS applications.
• FG WilsoncoreTechnology or IntegrationSourced FG Wilson 750kVA standby generator for industrial UPS installation at Capita factory.
• APC (Schneider Electric)coreTechnology or IntegrationInstalled APC Easy UPS 40kW systems for National Gallery project. Carter Sullivan is trained and authorised by Schneider to commission, service and repair APC Easy UPS range.

Scale indicators9 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• Vertiv: Global critical power and data centre infrastructure OEM (UPS, PDUs, cooling). Sells similar UPS products at scale and competes for large enterprise and data centre contracts, including in the UK.
• Schneider Electric (APC): Global UPS manufacturer via the APC brand and a Carter Sullivan partner. Competes for large enterprise data centre and life-safety UPS contracts in the UK and globally.
• Eaton: Global UPS manufacturer and Carter Sullivan's named partner. Competes indirectly by selling direct and through other partners; offers the same UPS product lines (e.g., 93PM) that Carter Sullivan installs and services.

Emerging players

• Riello UPS: European UPS manufacturer and Carter Sullivan's named partner for Riello Master HP and MPW series. Competes in the same UK mid-market and enterprise UPS space through its own direct and partner channels.
• Kohler (Kohler Power Systems): Manufacturer of standby generators and UPS systems with a UK presence. Carter Sullivan is an approved Kohler partner; the overlap is in turnkey UPS-plus-generator solutions for data centres and life safety.

Direct peers

• Uninterruptible Power Supplies Ltd (UPS Ltd): UK UPS specialist providing maintenance, installation, and rental services for UPS systems. Direct competitor in the UK contracted service market.
• Critical Power Supplies: UK UPS and generator distributor and service provider offering installation, maintenance, and hire. Direct competitor in the same UK critical-power integrator niche.
• Specialist Power Systems: UK UPS and critical power specialist providing installation, maintenance, and hire services. Comparable scale and target market to Carter Sullivan, with overlapping product offerings in three-phase UPS and standby power.
• Power Control Ltd: UK-based specialist supplier, installer, and maintainer of UPS systems, generators, and batteries. Closest direct competitor to Carter Sullivan, with a comparable focus on bespoke critical-power solutions and contracted service work across similar customer segments.
• Powertecnique: UK-based UPS specialist offering sales, installation, and maintenance of UPS and generator systems. Overlaps with Carter Sullivan in mid-market and enterprise UPS service contracts.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks1 record

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/carter-sullivan-ltd/posts/?feedView=all
• Xx.com/cartersullivan

Compliance6 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles8 records

Subsidiaries1 record

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 Carter Sullivan