1. Solar Panels
Must specify brand, model, wattage, number of panels, panel type, and product warranty conditions and production capacity.
Article · Choose an installer
How to choose a solar PV installer: 10 things to check
A cheaper quote may not provide the same item. Use this list to compare point by point. To know what you are paying for and who will be responsible after delivery.
Short answer
What should a good installation company have?
Should actually explore, design from the use of electricity. Clearly specify equipment and scope of work. Installed according to standards Have certified documents And there is a team responsible for after sales. If you can't answer basic questions or rush to pay before seeing the design and details. You should stop comparing first.
Main equipment
1–3. Inspect panels, inverters, and the structure.
2. Inverter
Must specify model, size, warranty, monitor system. and check that it is the model that the electrical authority accepts for that job
3. Panel mounting structure.
Must be suitable for the type of roof. The material doesn't rust easily, holds firmly, and has an explainable way to prevent water leaks.
Safety
4–5. Check wiring and protective equipment.
4. Wires and connectors
DC cables must be outdoor- and UV-rated, correctly sized for the current, and fitted with properly compatible connectors.
5. Electrical cabinets and protection systems
The design should specify circuit breakers, surge protective devices, disconnect switches, grounding, and all required warning labels.
Ask clearly
Who designed it, who supervised the work, and after installation will they receive an electrical system design and a test report?
PEA recommends solar rooftop safety Choose equipment that meets standards. Installed by experts and do not consider price alone
Scope of work
6–8. Inspect the roof, original electrical system, and documents.
- 6. Roof: Inspect the structure, anchor points, work walkways and determine who is responsible if a leak occurs from the installation work.
- 7. Original electrical system: Check the main cabinet, meter, ground wire, and any additional renovation costs that may increase.
- 8. Documents: Specify who created the design. Apply for connection, make an appointment for inspection, change the meter. and responsible for fees
The term “fully installed” is not enough. Always have the bidder list what is included and excluded in the document.
after delivery
9–10. Check warranty and after-sales service
9. Warranty
Separate between warranty from the manufacturer. Production capacity guaranteed and guarantee of installation workmanship With claim channels
10. After-Sales Service
Ask who takes care of you when the app alerts you, power production drops, or the inverter fails. or the roof has a problem And how much time do you have to respond?
delivery
You should receive a manual, system model, and equipment list. Machine number Warranty documents, test results, and monitoring app accounts
Warning signs
6 things to be careful of
- Offer the size of the system without asking to see the bill or asking how long the electricity is used.
- The roof and electrical systems were not surveyed before confirming the final price.
- Do not specify the device model. Use the word “or equivalent” without criteria.
- Guaranteed high savings results without revealing assumptions.
- Ask for a large sum of money before having a design, scope of work, or contract.
- No work, contact channel or the responsible person after the sale who can be verified
Quotation comparison table
Summary of things that should be noted from each company
| Topic | must be seen in the document |
|---|---|
| system | Size, kW, number of panels, estimated output and assumptions |
| equipment | Brand, model, quantity, warranty |
| Installation work | Structure, electrical wiring, protection system, roof work, original electrical work |
| Document | Responsible person, procedures, fees, and deliverables |
| care | Work guaranteed, problem reporting channels and response period |
Want the engineering team to help look at the work site?
PTH GREEN surveys, designs, installs and maintains integrated systems. Ready to explain details before making a decision.
Read more: Installation steps until activation · Price for each size