Costing and Pricing Solar System SS2 Solar Photovoltaic Installation & Maintenance Lesson Note

What is a Bill of Quantities (BOQ)?

In simple terms, a Bill of Quantities (BOQ) is a detailed shopping list. But it isn’t just a list of items; it includes the quantity, the unit price, and the total cost for everything needed to finish a solar installation.

Why is the BOQ so important?

1. Transparency: It shows the customer exactly what they are paying for.
2. Accuracy: It helps the installer make sure they don’t forget small things like screws or cable clips.
3. Comparison: It allows the customer to compare your prices with another technician fairly.

The “Hidden” Items: Beginners often remember the big things (panels, batteries) but forget the small things (trunking, lugs, tapes). A good BOQ covers everything from the roof to the ground.

Structure of a Solar BOQ

A professional BOQ is usually divided into three main sections:

1. Primary Components (The Big Items)

• Solar Panels (e.g., 4×550W)
• Hybrid Inverter (e.g., 3.5kVA)
• Batteries (e.g., 2×200Ah Lithium)

2. Balance of System (BOS) / Accessories

• Mounting Racks (Aluminum rails)
• Solar Cables (6mm2 DC cables)
• Battery Cables and Connectors
• Protection Gear (Circuit breakers, SPD, and Changeover switches)

3. Logistics and Labor

• Transportation (Moving gear to the site)
• Installation Fee (Workmanship)

Cost Analysis – What Determines the Price?

When you are doing a Cost Analysis, you are looking at why a system costs a certain amount. Several factors can change the price of your BOQ:

• Quality of Components: A Lithium battery costs 3 times more than a Lead-Acid battery, but it lasts 5 times longer. Part of your job is explaining this “value” to the client.
• Site Complexity: Is the roof very high? Is the battery room far away from the panels? Long distances mean more expensive copper cables, which increases the cost.
• Market Exchange Rates: Since most solar parts are imported to Nigeria, the price of panels can change from Monday to Friday based on the dollar rate.

Pro-Tip: Always put an “Expiry Date” on your quote (e.g., “Valid for 7 days”) so you don’t lose money if prices jump up suddenly.

Pricing – How to Set Your Professional Fee

How much should you charge for your “Workmanship”? This is where many new entrepreneurs struggle.

Three ways to decide your price:

1. Percentage of Materials: Some technicians charge 10% to 15% of the total cost of the hardware.
2. Daily Rate: You calculate how many days the job will take and multiply it by a fair daily wage for yourself and your helpers.
3. Flat Fee based on System Size: For example, charging a fixed amount per kVA installed (e.g., ₦50,000 per kVA).

Remember: Your fee must cover your time, your tools, your transport, and the “Brain Work” of designing the system correctly.

Profit vs. Markup

To stay in business, you must understand the difference between the Cost Price and the Selling Price.

• Markup: This is the extra amount you add to the cost of the materials to cover your overhead (office rent, data, phone calls).
• Profit: This is what is left over after you have paid for all materials, paid your helpers, and covered your transport.

The “Warranty Fund”: A smart solar businessman always keeps a small portion of the profit in a separate account. If a customer calls three months later because a wire came loose, you use that fund to go back and fix it without it “hurting” your pocket.

Summary: * A BOQ is your roadmap.

• Cost Analysis helps you understand your expenses.

Fair Pricing ensures you get the job while staying profitable.