Common Solar System Types
Common solar system types include grid tied, off-grid, hybrid, solar PV with battery storage, and solar thermal systems. Each system differs in grid connection, storage capability, cost structure, and suitability for commercial sites.
Whether your business is in North Scotland under SSE Power Distribution or in London under UK Power Networks, the optimal system design will differ. This guide breaks down the core system types we install, moving beyond theory to explain how these configurations perform in real UK commercial environments.
The right choice depends on energy demand, resilience needs, available space, and long-term strategy. Understanding these differences helps businesses select a system that aligns with operational and financial goals.
What Are Solar System Types?
Solar system types refer to the configuration of solar technology, grid connection, and storage components used to generate and manage electricity or heat. The main distinction lies in whether the system connects to the national grid, operates independently, or combines grid access with battery storage.
For commercial properties in the UK, system type affects export eligibility, backup capability, capital cost, and compliance requirements. Selecting the appropriate configuration shapes energy savings, resilience, and return on investment.
Grid Tied Solar Systems
The majority of commercial solar installations in the UK are grid-tied. These systems are directly connected to the electricity network, allowing you to use the power you generate on-site and export any surplus for revenue under a Smart Export Guarantee (SEG) tariff. With some SEG tariffs from suppliers like Octopus Energy offering attractive peak rates, a properly designed system can significantly impact operational overhead.
How Grid Tied Systems Work
Solar panels produce DC electricity, which an inverter converts to AC for site consumption. The system supplies building loads first. Surplus electricity exports automatically to the grid through the site’s existing connection.
Key Components
Core components include solar PV modules, a grid-tied inverter, mounting structures, DC and AC cabling, generation meter, and connection to the distribution network.
Typical Use Cases For Commercial Sites
Commercial offices, warehouses, retail units, and manufacturing facilities commonly use grid-tied systems. Sites with consistent daytime demand benefit most, as they consume a high proportion of generated electricity on site.
Advantages And Limitations
Grid-tied systems provide lower capital cost and straightforward integration. They reduce electricity bills immediately. However, they do not provide backup power during grid outages unless combined with battery storage and suitable controls.
A grid-tied system is the most straightforward path to reducing energy costs for businesses with high daytime demand. For a recent project at a manufacturing facility in Yorkshire, operating within the Northern Powergrid DNO region, the primary goal was offsetting peak daytime machinery use.
We installed a 150kWp array using JA Solar panels and an SMA string inverter. The system directly services the building’s load, drastically cutting grid import during production hours. The main limitation is clear: during a grid outage, a standard grid-tied system will also shut down for safety.
Off Grid Solar Systems
An off-grid system operates completely independently of the national grid, relying solely on solar generation and extensive battery storage. These are specialist solutions for sites where a grid connection is either impossible or prohibitively expensive. Think remote agricultural buildings in rural Wales, telecoms towers, or off-grid holiday parks in the Scottish Highlands.
You can find out more about Off Grid commercial solar systems in our dedicated guide.
How Off Grid Systems Operate
Solar panels charge a battery bank through a charge controller. An inverter converts stored DC electricity into usable AC power. System sizing must account for peak demand and periods of low sunlight.
Battery Storage Requirements
Battery capacity determines reliability. Systems require sufficient storage to cover overnight consumption and low-generation days. Lithium-ion batteries dominate commercial designs due to higher energy density and longer cycle life.
Suitable Applications And Locations
Agricultural buildings, remote research facilities, telecoms infrastructure, and off-grid holiday parks use these systems. Sites far from distribution networks avoid grid connection costs.
Advantages And Constraints
Off-grid systems deliver full energy independence. However, they require higher upfront investment, larger battery banks, and careful demand management to prevent shortfalls during winter months.
Sizing an off-grid system is critical and must account for the worst-case scenarios of UK weather. The battery bank, typically using lithium-ion technology for its durability, must have enough capacity to cover several days of low sunlight. While they offer complete energy independence, the capital cost is significantly higher due to the need for large battery banks and often a backup generator.
Hybrid Solar Systems
A hybrid system combines a grid-tied solar array with an on-site Battery Energy Storage System (BESS), managed by a sophisticated hybrid inverter. This configuration gives you the best of both worlds: access to the grid when you need it, plus the ability to store excess solar energy for later.
How Hybrid Systems Combine Grid And Storage
Solar PV generates electricity for on-site loads. Surplus power charges batteries before exporting to the grid. When solar output drops, stored energy supplies loads before importing electricity.
Energy Management And Backup Capability
Energy management systems prioritise self-consumption and control charging and discharging. Some hybrid systems provide backup power to selected circuits during grid outages, depending on inverter capability and system design.
Commercial Use Cases
Hybrid systems suit businesses with variable demand or high peak tariffs. Offices, data-driven operations, and sites with critical equipment often benefit from limited backup capability.
Strengths And Trade Offs
Hybrid systems increase self-consumption and reduce peak demand charges. Additional hardware and batteries raise capital cost and extend payback periods compared with grid-tied systems.
This approach is ideal for businesses looking to maximise self-consumption or mitigate high evening energy tariffs. We worked with a data-driven business in the South West, whose critical servers required consistent power. Their National Grid DNO connection was stable, but their energy profile included significant overnight consumption.
We deployed a system using high-efficiency REC Alpha panels paired with a Sunsynk hybrid inverter and battery bank. The system prioritises running loads from solar, then charges the batteries with the excess. Only when the batteries are depleted does it draw from the grid, giving the client true energy flexibility.
Solar PV With Battery Storage
Adding a battery system to a solar array is about more than just backup power. It’s about intelligent energy management. You can find out more about Hybrid commercial solar systems with batteries in our dedicated guide.
AC-Coupled Vs DC-Coupled Storage
We can retrofit batteries to existing solar arrays using an AC-coupled setup (like adding a Tesla Powerwall). For new installations, a DC-coupled system connected to a hybrid inverter like those from GivEnergy or Growatt is often more efficient.
Backup Power And Resilience
When paired with an inverter capable of “islanding,” a battery system can keep critical circuits running during a power cut. For a recent client in the food processing sector, this meant their refrigeration and IT systems could remain operational through a local outage, preventing thousands of pounds in lost stock.
Peak Shaving And Load Management
For businesses on tariffs with high capacity charges, a BESS can be programmed to discharge during peak demand periods. This “peak shaving” lowers your demand on the grid and can lead to substantial savings on your electricity bills.
Solar Thermal Systems
It’s important not to confuse solar PV (photovoltaics) with solar thermal. Solar thermal systems use collectors to absorb the sun’s energy to generate hot water, not electricity. These systems are highly effective for businesses with large and consistent hot water demands.
Solar thermal systems generate heat rather than electricity. They use collectors to capture solar energy for hot water or heating applications.
Commercial properties with high and consistent hot water demand often achieve strong performance from solar thermal installations.
How Solar Thermal Differs From Solar PV
Solar thermal systems transfer heat through fluid-filled collectors and store it in insulated tanks. Solar PV systems generate electricity through photovoltaic cells.
Commercial Hot Water Applications
Hotels, leisure centres, care homes, hospitals, and food processing sites use solar thermal for domestic hot water and process heating. High daily consumption improves system efficiency.
When Solar Thermal Is Suitable
Solar thermal suits sites with significant hot water demand and available roof or ground space. It is less suitable where demand is low or irregular.
We’ve seen exceptional returns for clients in the leisure and hospitality sectors. A leisure centre with a swimming pool, like the Easton Leisure Centre in Bristol, can use a solar thermal array to pre-heat water, drastically reducing its gas consumption.
Similarly, hotels, care homes, and commercial laundries can achieve significant operational savings. The key is consistent daily demand for hot water to make the investment worthwhile.
Ground-Mounted Vs Rooftop Solar Systems
The decision to mount panels on a roof or on the ground depends entirely on your site.
Structural And Space Considerations
Rooftop systems require structural assessment to confirm load-bearing capacity. Ground-mounted systems need sufficient land area and suitable ground conditions.
- Rooftop: Most commercial installations in the UK are on rooftops, as this uses existing, non-productive space. Before any installation, a full structural assessment is required. Permitted development rights in England often cover rooftop installations, provided they don’t project more than 200mm from the roof surface or 1 metre on a flat roof, but sites in conservation areas or on listed buildings face stricter rules.
- Ground-Mount: For businesses with available land, like farms or large industrial sites such as the Shotwick Solar Park, ground-mounted arrays offer easier access for maintenance and can be oriented at the perfect angle for UK sun. However, these installations almost always require a formal planning application and can have a larger environmental impact assessment.
Planning Permission And Compliance
Permitted development rights apply to many rooftop systems in England, subject to limits. Ground-mounted arrays may require formal planning permission, especially on larger commercial sites.
Installation And Maintenance Access
Ground-mounted systems provide easier access for cleaning and servicing. Rooftop systems reduce land use but may require specialist access equipment.
Comparison Of Common Solar System Types
System choice depends on grid access, storage needs, and operational priorities. The following table summarises key differences for commercial applications.
| System Type | Grid Connection | Battery Included | Typical Application | Key Benefits | Key Limitations |
|---|---|---|---|---|---|
| Grid-Tied | Yes | No | Offices, retail, warehouses | Lower cost, simple design | No backup during outages |
| Off-Grid | No | Yes | Remote sites, rural facilities | Energy independence | High cost, complex sizing |
| Hybrid | Yes | Yes | Sites needing resilience | Backup capability, peak reduction | Higher capital expenditure |
| Solar Thermal | Optional | Thermal storage | Hotels, hospitals, leisure centres | Efficient hot water production | Limited to heat applications |
Each system addresses different operational and financial priorities.
Choosing The Right Solar System For Your Business
Selecting a system requires assessment of energy demand, capital budget, site conditions, and long-term strategy. Commercial feasibility studies typically include load analysis, structural review, and grid capacity checks.
A structured evaluation reduces oversizing risk and ensures regulatory compliance.
Energy Demand And Load Profile
Half-hourly consumption data reveals peak demand and daily patterns. High daytime usage favours grid-tied PV. Significant evening demand may justify battery storage.
Budget And Funding Options
Capital expenditure varies by system type and storage inclusion. Power purchase agreements, asset finance, and capital purchase models influence cash flow and return timelines.
Site Constraints And Planning Requirements
Roof strength, shading, available land, and grid connection limits shape technical design. Planning requirements differ between rooftop and ground-mounted systems.
Long-Term Energy Strategy
Net zero targets, resilience planning, and projected energy price trends influence system selection. Scalable designs allow future battery expansion or additional PV capacity.
FAQs
What Is The Most Common Type Of Solar System In The UK?
Grid tied solar PV systems are the most common in the UK. Most commercial properties remain connected to the national grid and export surplus electricity.
Do All Solar Systems Require Batteries?
Not all solar systems include batteries. Grid-tied systems operate without storage, while off-grid and hybrid systems include batteries as core components.
Which Solar System Type Provides Backup Power?
Hybrid systems and certain solar PV systems with battery storage provide backup power when designed with appropriate inverters and load separation.
Is An Off Grid Solar System Suitable For Commercial Properties?
Off-grid systems suit commercial properties in remote locations without grid access. Most urban and industrial sites prefer grid-connected solutions due to cost and reliability.
Conclusion
A feasibility study is the essential first step. It involves analysing your half-hourly energy data to understand your load profile, conducting a structural review of your premises, and submitting a grid connection application to your DNO.
This process ensures the system we design is not just technically sound but perfectly aligned with your financial and operational goals, whether that’s hitting a net-zero target or simply securing your business against volatile energy prices.
