If your home or business is near the sea, choosing a solar PV system also requires considering exposure to the marine environment. Sunlight and available space remain important, but on their own they do not determine whether the equipment is suitable for the specific location.
Ask for the suitability of the entire installation for your property to be documented. A reference to “salt-resistant panels” is not enough to assess the mounting system, connections, inverter, and maintenance requirements.
Distance from the coast is the starting point for the discussion
When you first get in touch, mention that the property is coastal and provide its exact location. Gather photos of the building, the roof, and the potential inverter location. Note whether there is visible deterioration on other metal components of the property, so the person responsible for the site inspection can assess it.
Salt spray is the presence of tiny salt droplets or particles in the air. It can create a corrosive environment for materials and components. The assessment needs to relate the actual conditions at the site to the equipment’s permitted operating conditions.
In its statement on coastal installations, SMA explains that there is no exact formula for converting distance from salt water into a corrosivity category. It lists different suitability requirements for specific models. Therefore, do not treat a general distance as universal approval for every inverter or panel.
What does the panels’ salt spray test mean?
In technical documents, you may come across the standard IEC 61701. It describes test sequences for assessing the resistance of photovoltaic modules to salt spray corrosion.
The relevant documentation is useful, but it must apply to the model being proposed to you. Ask for clarification on:
- The panel’s exact model number and the document in which it is listed.
- The standard’s edition and the test method or severity specified.
- The requirements for coastal installation in the manufacturer’s manual.
- Any need for additional confirmation for the project’s exact location.
A laboratory test covers defined assessment conditions. It is not a promise that any installation will be free from corrosion, nor does it replace installation and maintenance instructions. Also, documentation for a panel does not automatically cover the system’s other components.
Read the specific manufacturer’s requirements
Limits and requirements are not the same for all products. For example, the Trinasolar Vertex manual, edition N, has a dedicated section on coastal installation. It includes distinctions based on distance from the coastline, requirements for the frame type, and protection for specific points.
This shows why choosing a well-known brand or a “double glass” specification is not enough. The installer needs to confirm that the exact combination of product, location, and installation method is permitted by the applicable guidelines. If contacting the manufacturer is required, ask for this to be completed before you place an order.
Do not transfer specifications from another product range or an older technical datasheet. Keep the version of the documents used for your proposal.
Mounting systems and small components need a separate check
The discussion often focuses on the panels’ glass, while the mounting system includes rails, clamps, connectors, and contact points between different materials. Ask the designer to describe which mounting system is planned and how its suitability for your environment will be confirmed.
In the quote, look for the manufacturer and product range of the mounting system, the specifications of the connectors, and any additional protective measures planned. The general description “stainless steel screws” does not, by itself, describe the entire solution.
Also ask how the supports will remain accessible for inspection. Corrosion protection and adequacy for wind loads are separate issues, and both need to be assessed for your structure.
Choose an inverter location based on documented guidance
Ask for the inverter’s location to be marked on the plan and checked against the instructions for the specific model. The description “suitable for outdoor use” needs to be accompanied by confirmation that it is suitable for the actual installation conditions.
If a protective cover or another location is proposed, ask how the required clearances and ventilation will be maintained. Do not install enclosed cabinets or improvised protective covers after the fact without having the responsible technician check them.
To learn about the device’s role, you can read our guide to the inverter. Here, the focus is on whether the model and its location are suitable for this specific coastal property.
Agree on an inspection and support plan
Before handover, ask for written instructions on the planned inspections, how often they should take place, and how to report deterioration. The plan needs to be based on the equipment and the project conditions, rather than a general rule is copied for all installations.
Keep photographic records of the original condition and reports from technical visits. If you notice discoloration, coating damage or changes to a metal component, notify the support representative. A photograph helps with reporting, but diagnosis must be carried out by a qualified professional.
Do not apply rustproofing products, paints or cleaners to the equipment or connections yourself. Ask for instructions that are compatible with the manufacturer’s requirements. For coverage and the service process, also see our guide to photovoltaic warranties.
What to request with the final quote
- Documentation confirming that the specific panels and inverter are suitable for your location.
- Detailed description of the mounting structures and connection components.
- Clear details of any additional protective work and its cost.
- Recommended equipment locations and access for inspection.
- Inspection, maintenance and support process instructions.
At Solar Home, we assess your site, shading and energy needs for the design of the photovoltaic system. Let us know from the outset that the property is located near the sea and contact us to discuss the needs and requirements of your installation.
