Work order app for solar panel installers: installation and completion slip with photos, serial numbers, and signature

Paper work orders still work, until you run multiple installations per day, a customer asks for proof, or a dispute arises regarding additional work. With solar panels, extra paperwork is added: photos of the roof, inverter settings, serial numbers, meter cabinet, plus a clear handover with approval.

With a work order app , you record this on location, on your phone or tablet. The office monitors the process immediately, and you get the job ready for invoicing faster.

Why a work order app pays off, especially for solar panels

Installing solar panels is a mix of logistics, assembly, electrical work, and commissioning. The work order is not just “hours and materials,” but also your evidence file. If information is scattered across WhatsApp, loose notes, and photos in the camera roll, it takes time to gather everything together later.

A good app makes the work order part of your standard workflow: you fill in fixed fields, add photos , and sign off . This prevents forgotten details and saves a lot of back-and-forth phone calls.

Installation slip and delivery slip: what do you always want to record?

After completion, an installer wants to be able to demonstrate at a glance what has been installed and what has been delivered. Think of warranty, after-sales service, and clear communication with the customer.

Following this foundation, the rule is: the more consistently you document, the faster your team works.

• Customer and project details: address, contact person, project number, roof surface(s)
• Serial numbers and components: panels, inverter(s), optimizer(s), battery, charging station (if applicable)
• Photos: pre-situation, installation, cable routing, meter cupboard, final result
• Hours and occupancy: mechanic(s), travel time, overtime
• Materials and additional work: rails, clamps, cabling, extra circuit, roof feed-through
• Delivery: checklist items, comments, agreement and signature

One sentence that is often true: if it is not on the receipt, it will be difficult to prove later.

From roof to invoice: this is how the process works in practice

In the morning, you schedule the job. On-site, technicians open the work order, register hours, and record any discrepancies. During installation, you take photos of crucial points: fastenings, cable entries, the meter cabinet, and any damage or limitations.

At the end of the day, you wrap up with a deliverable: notes, photos, and client approval. The office sees the information immediately and can finalize the administration without waiting for paperwork.

Which features really make a difference in solar panel installations?

Not every work order app is suitable for work on the roof. Solar panels require quick data entry, clear documentation, and working in locations with poor coverage.

When selecting an app, these are the points that save the most time in practice and prevent discussions:

• Quickly add photos: multiple photos per work order, logically stored with the project
• Register serial numbers: Copy without errors, preferably via scan or fixed fields
• Signature on location: approval of delivery, directly linked to the invoice
• Ability to work offline: fill in without range, automatically synchronize later
• Hours, materials, and trips in a single flow: Do not switch between systems or lists

What do you document, and why? (useful as an internal standard)

The table below is often used as a “minimum set” for a complete installation file. You can also use this as an internal checklist for new technicians.

Werkbriefje.app for solar panel installers

Werkbriefje.app It is designed for small construction and installation companies that want to move away from paper, without a complicated ERP implementation. You work with a mobile app for field use and a desktop environment for the office. Hours, materials, trips, and project information come together in one system.

For solar panels, it is particularly nice that your work order is not just a “receipt,” but also your project file:

• Record photos and notes for additional work or deviations directly on the work order, so that it is clear later what has been done.
• Time registration (also travel time, overtime and leave) is linked to the project, giving you a quicker overview per job or period.
• Mileage registration can be calculated automatically via Google Maps, handy if you rite pass on or want to charge internally.
• In the dashboard, you prepare completed jobs for billing, with all hours and props with it.

For those who work with a schedule: the annual schedule with drag-and-drop helps keep teams and staffing organized, especially during busy periods with many installation days.

Working with photos, serial numbers, and signatures: here's how to keep it neat

The pitfall is not the app, but the discipline. Therefore, agree on a simple internal procedure: which photos are mandatory, where do you place serial numbers, and when do you have them sign?

A practical approach that often works:

• Photos: fixed set (meter cupboard, roof detail, final photo) and extra photo in case of deviation
• Serial numbers: Note down immediately upon placement, not at the end of the day “by heart”.
• Signature: only after explanation to the client, with delivery note included

This way, you avoid having to “piece together” your file afterwards.

Hassle-free implementation (even with a small team)

Implementing a work order app doesn't have to be a major project. Start with one team or one type of job (only solar panels), establish a standard work order template , and improve it after a week based on feedback.

• Start small: 1 team, 1 week, fixed agreements on scheduling
• Make it mandatory: No work order is no completed job
• Link to invoicing process: Only invoice when the receipt is complete

Werkbriefje.app is available by default, with an option for customer specific and an adjustment to the corporate identity if you want.

Costs and what you get in return

The price indication of Werkbriefje.app is €12,50 per user per month (excl. VAT). For many small installation companies, the profit lies in fewer administrative hours, less rework due to missing information, and faster invoicing because everything comes in immediately.

If you want to know if this fits your way of working, it is wise to run a few actual installation days with the app first. You will then quickly notice whether data entry on the roof is smooth enough and whether the office benefits from it immediately.

Frequently asked questions from practice

Does this also work if we have no coverage on location?
Working offline is important for roofs and technical rooms. Choose a workflow that allows you to register even without a stable internet connection and synchronize later.

Can we properly substantiate the additional work?
Yes, if you attach photos and notes directly to the work order. That makes conversations with the customer or contractor much easier.

Is it only for solar panels?
No, the same principle applies to service, faults, charging stations, meter cabinet modifications, and maintenance. You keep one method of registration for all your jobs.

If you want a work order app that keeps track of hours, materials, trips, and deliveries, then this is Werkbriefje.app a logical option for solar panel installers to consider.