Solar Panels, Inverters and Batteries

The “best” solar panel or battery is not a useful standalone answer. Equipment has to work as one designed system on your roof, with an installer and warranty route that will still exist if something fails.

Solar panels

Compare rated power, dimensions, product warranty, performance warranty, temperature coefficient, mechanical loading and manufacturer support. A higher-wattage panel can reduce panel count but may be physically larger; it does not automatically produce a better roof layout.

Inverters

The inverter converts DC electricity from the array into AC electricity for the home. Check AC rating, tracker inputs, string design, shade strategy, export control, monitoring, warranty and replacement access. The panel warranty is poor comfort if an incompatible or undersized inverter limits the system.

Optimisers and microinverters

Module-level electronics can help with complex roofs, monitoring or shade, but add equipment on the roof and may add cost. Ask what problem they solve on this property and what happens when one needs replacing.

Batteries

Compare usable kWh, charge and discharge power, round-trip efficiency, warranty throughput, fire-safety requirements, backup hardware and compatibility with the inverter and tariff. Treat panel-only and battery cases separately.

Mounting and roof interface

Fixings, rails, roof hooks, waterproofing and wind-loading design matter as much as the visible modules. Ask how the roof condition was assessed and who is responsible for leaks or damage.

Monitoring and data

Check what the app shows, who holds the account, whether local access remains if cloud services close, how long data is retained and whether installer access can be revoked.

Product comparison checklist

• Exact model numbers on the contract.
• Compatibility documented by the system designer.
• Manufacturer and installer warranty routes.
• Replacement availability and labour coverage.
• Monitoring ownership and subscription cost.
• Fire, isolation, shutdown and maintenance information.
• MCS-certified installer verified independently.