Battery storage insurance

Pathway one: domestic and SME battery installers

If you fit batteries in homes, small commercial buildings or alongside solar, your question is installer liability. The core covers are employers liability, public liability including products, and possibly professional indemnity if you design or size systems.

Underwriters focus on lithium-ion hazards: fire and thermal runaway, ventilation and location in the building, and compliance with manufacturer instructions. Some insurers restrict battery work, apply fire exclusions or ask for a stated maximum capacity.

• Typical and maximum capacity per installation
• Indoor, garage, loft or external locations
• Product brands and whether installs follow manufacturer training
• Handling, storage and transport of batteries before installation
• Whether you also decommission or replace batteries

Fire, thermal runaway and aggregation

Thermal runaway is a self-sustaining overheating event in a cell that can spread. Policies may exclude it, limit it or require conditions. Aggregation is the question of how many batteries you hold in one place: a warehouse of stock, a van load or a depot.

Storage and transport are not trivial. Stock held at your premises is a property and fire matter, and carrying batteries in vehicles can fall under specific conditions or dangerous-goods rules. Disclose volumes and where they are kept.

Defective product, workmanship and resulting damage

If a battery fails because of a manufacturing defect, responsibility may sit with the manufacturer, but claims frequently name the installer too. Liability policies may respond to resulting damage while excluding the cost of the faulty work or product itself. Performance or capacity guarantees are generally not insured automatically.

Pathway two: commercial BESS owners and operators

Owners and operators of grid-connected or large commercial storage face a different structure: construction-phase cover while the site is built and commissioned, then operational property damage and, where relevant, business interruption. Third-party liability sits alongside.

These are project exposures, usually arranged through the project and financing structure, and often requiring lender-driven conditions. We can discuss the pathway and what information underwriters ask for, but we do not promise that project insurance is available, nor limits or terms.

Delay in start-up (DSU), where offered, concerns the insured financial interest when agreed insured physical damage delays the planned start of a project, subject to its trigger, waiting period and exclusions. It is not general protection against delays, a contractor's turnover policy or a late-completion guarantee.

Which route is yours

Choose 'Domestic/SME battery installer or maintainer' if you fit systems for other owners. Choose 'Commercial BESS project owner — construction' or 'Commercial BESS owner/operator — operational' for the appropriate project phase. If you have multiple roles, select that option and explain them; owning or operating an asset is not the same as being its installation contractor.