A rooftop solar job isn’t one appointment. It’s a site survey, a permit application (sometimes), an install that might span one or two full days, a grid connection inspection, and then recurring maintenance visits for the life of the system. Scheduling that well is the difference between a crew that finishes on time and one that’s always behind, always calling to rebook, always starting the next job slightly wrong.

Treat the survey as its own job

The most common scheduling mistake in solar is booking the install before you know the site. Send a technician to assess the roof pitch, shading from nearby trees or structures, the meter location, and the available wall space for the inverter — before you commit a date.

When the survey is a real job in your system — assigned to a technician, tracked, documented — it produces a site report that travels with the job. The crew arriving to install knows exactly what to bring. No surprises about a non-standard tile roof. No return trips because the conduit run is longer than expected.

Block multi-day jobs honestly

A 3kW residential system on a straightforward roof takes most crews about one full day. A 5kW or 10kW system on a commercial rooftop can easily run two days, especially with string inverters, multiple sub-arrays, or complicated AC cable runs.

If your schedule blocks a 10kW commercial job as a single day, every job after it gets pushed. The customer expecting installation to finish Tuesday now gets a call on Tuesday afternoon saying “we need to come back tomorrow.” Your Wednesday crew has to shuffle.

The fix is simple but requires discipline: when you quote the job, estimate the installation duration honestly. Block that duration in the schedule. Assign the same crew across both days so nobody has to context-switch.

Manage weather dependencies explicitly

Solar installation is one of the few fields where you genuinely can’t work in the rain — not safely on a pitched roof. If you’re booking two weeks out and weather isn’t in your thinking, you will have last-minute reschedules.

A few habits that help:

Keep a buffer slot mid-week for rain reschedules rather than stacking jobs wall-to-wall
When confirming an install date with a customer, mention that rooftop work depends on weather and you’ll notify them 24 hours before if there’s a delay
Have a list of indoor prep work (mounting rail fabrication, inverter configuration) that can fill a rain day without wasting crew time

Keep the whole crew on one view

Most solar installs in the 3–10kW range require at least two people on the roof and ideally a third handling ground-level work — running cable, preparing the inverter mount, keeping parts organized. When you have three people on one job and another job starting somewhere else that day, the person managing it all needs to see the full picture.

When the schedule shows who’s assigned where across the week, you stop making the call that pulls your most experienced technician off a half-finished roof to go deal with a customer complaint somewhere else. That call feels necessary in the moment. It costs you hours of rework.

Grid connection and inspection timing

In Thailand, after the system is installed, connecting to the grid requires an inspection and approval from the Provincial Electricity Authority (PEA) or Metropolitan Electricity Authority (MEA). This step can take days or weeks depending on the area and queue.

Build this into your project timeline. When you quote a customer a “completion date,” be clear whether that means physical installation is done or whether it includes grid connection. Customers who expect to start exporting power the same week you finish installing are often surprised.

Create a follow-up job in your schedule for the day of the inspection. It doesn’t have to be a full crew — sometimes just the lead technician needs to be available. But if it’s not in the schedule, it gets forgotten.

Don’t lose the maintenance

The install is the start of the relationship, not the end. Solar panels lose efficiency when dirty — dust, bird droppings, and Bangkok’s air pollution reduce output measurably over months. Inverters need periodic checks. Mounting hardware should be inspected after the first monsoon season.

Set up the maintenance cycle on the day you commission the system. When that’s linked to the install job, the next service visit schedules itself for six months out. You don’t have to remember. The customer gets a reminder. The cleaning job appears in your schedule automatically.

That’s how one rooftop install becomes a decade of recurring visits — and how the customers you install for this year are still your customers in five years.

Related feature: see how OnSiteQ’s scheduling & appointments keep multi-step solar installs on track.

Scheduling a solar installation crew without the chaos