Shut down in this order: AC side first, then the inverter, then the DC disconnect, then verify every conductor is dead with a meter before anything else happens. Safely shutting down a solar array for roof work is not a single switch, because panels keep generating voltage in daylight no matter what you switch off downstream. The array itself cannot be turned off, which is the fact the whole procedure is built around.
That single point trips up most people. Killing the inverter or opening the main breaker stops power flowing to the house and leaves the DC conductors between the panels and the disconnect fully energized. Our guide to solar disconnect switches covers the hardware this procedure depends on.
Quick Answer
Turn off the AC breaker feeding the inverter, shut the inverter down, then open the DC disconnect. Verify with a meter that the conductors on the load side of the disconnect read zero. Treat everything upstream of the DC disconnect as live for as long as there is any daylight on the panels.
Key Points
- Panels produce voltage whenever light hits them, including on overcast days.
- Shutdown order runs AC side inward, never DC side first.
- Always verify dead with a meter rather than trusting a switch position.
- Grid-tied inverters stop exporting on grid loss, which does not de-energize the DC side.
- Battery systems keep an energized DC bus after the array is isolated.
- Covering panels reduces output and does not reliably bring it to zero.
Step by Step Shutdown Sequence
Work through these in order and do not skip the verification step.
- Open the AC breaker feeding the inverter. This stops the inverter exporting and, on a grid-tied system, starts its shutdown behavior.
- Power down the inverter at its own switch. Wait for the display to go dark and for any internal capacitors to discharge, which the manual will specify as a wait time.
- Isolate the battery, if there is one. Open the battery disconnect or main battery breaker so the DC bus is not fed from storage.
- Open the DC array disconnect. This separates the panels from everything downstream and is the switch that makes the equipment side safe.
- Verify with a meter. Read DC volts on the load side of the disconnect and confirm zero, then confirm zero on the AC side of the inverter.
- Lock out and tag. Physically prevent anyone reclosing a switch while you are on the roof.
- Treat the array wiring as live. Everything between the panels and the open disconnect still carries voltage.
Why the Array Stays Live
A solar panel is a generator with no off switch. Light in, voltage out, with no relay or contactor between the cells and the leads.
Open-circuit voltage also appears at very low light levels. A heavily overcast day still produces most of the string’s voltage even though current collapses, and voltage is what creates arc and shock hazard at a disconnected connector.
String voltages matter here. A series string of several panels can sit at several hundred volts DC, which is why the conductors between panels and disconnect get treated as live regardless of what downstream switches are doing.
What Each Switch Does and Does Not Do
| Action | What It Stops | What Stays Energized |
|---|---|---|
| Open AC breaker | Export to the panel and house | Inverter DC input, all array wiring |
| Inverter off switch | Conversion and output | Array wiring, DC input terminals |
| Battery disconnect | Storage feeding the DC bus | Array wiring |
| DC array disconnect | Array feeding the equipment | Array wiring upstream of the switch |
| Grid outage | Export, via anti-islanding | Everything on the DC side |
| Module-level shutdown | Voltage at each module, where fitted | Depends on the specific system |
Read the bottom two rows carefully. A grid outage is not a shutdown, and our guide to anti-islanding on grid-tied solar explains what that protection actually does.
Systems With Module-Level Shutdown
Some installations use microinverters or module-level electronics that reduce voltage at each panel when the system de-energizes. Where that equipment is fitted, the array conductors can drop to a low voltage rather than staying at full string voltage.
This depends entirely on the hardware installed, and it varies by manufacturer and by installation age. Check the system documentation and the placards on the equipment rather than assuming the feature is present.
Verify with a meter either way. Module-level shutdown is a design feature, and measurement is what confirms it worked today.
On the Roof
Do not disconnect connectors under load
Pulling a DC connector while current flows draws an arc that damages the connector and presents a real hazard. Open the DC disconnect first, and confirm zero current before touching any plug.
Do not walk on the modules
Glass and cells crack under point loads, and the damage is often invisible until production falls. Work from the frames and the roof surface, and see whether you can walk on solar panels for what actually happens.
Handle removed panels by the frame
Leads should be capped or kept apart so nothing shorts against the rail or the roof. Panels laid face up in the sun still produce voltage, so face them down or cover them while they are off the roof. Panel lifting and install tools exist to keep this manageable.
Keep the grounding path in mind
Removing panels and rails can interrupt the equipment grounding path for whatever remains connected. Plan the sequence so bonded components stay bonded, and see whether solar panels need grounding for context.
Bringing the System Back Up
Reverse the shutdown order. Close the DC array disconnect, reconnect the battery, power the inverter, then close the AC breaker last.
Watch the inverter and charge controller as each stage comes up. Fault codes on restart usually point at something disturbed during the work, such as a connector not fully seated or a grounding conductor left off.
Then compare production against your baseline. A restart is a good moment to catch a panel that was damaged during the job, and what breaks first in a solar system covers where to look. A multimeter handles both the verification and the follow-up checks.
When to Call a Professional
Anything grid-connected involves utility interconnection equipment and permitted work, and that is a licensed electrician’s job in most jurisdictions. High-voltage strings also carry consequences that do not forgive a mistake.
Roof work adds a second set of hazards independent of the electrical ones. If the job involves both height and live DC conductors, the argument for hiring it out gets strong quickly.
Recommended Reading
Frequently Asked Questions
How do you safely shut down a solar array for roof work?
Open the AC breaker feeding the inverter, power the inverter down, isolate any battery, then open the DC array disconnect. Verify zero volts on the load side with a meter and lock out the switches. Treat all wiring between the panels and the open disconnect as live.
Can you turn solar panels off?
Not the panels themselves. They generate voltage whenever light reaches them, with no switch between the cells and the leads. You isolate them from the rest of the system with a DC disconnect, which makes the equipment side safe and leaves the array wiring energized.
Does flipping the main breaker make a solar array safe?
No. The AC breaker stops power flowing to the house and does nothing to the DC side, where the panels are still producing. This is the most common and most dangerous misunderstanding about solar shutdown.
Do solar panels produce voltage on a cloudy day?
Yes. Current falls sharply in low light while open-circuit voltage stays high, and voltage is what creates shock and arc hazard. Overcast conditions are not a substitute for opening the disconnect.
Does covering panels with a tarp de-energize them?
It reduces output and does not reliably bring voltage to zero. Light leaks around edges and some material transmits enough to keep voltage present. Use the disconnect and verify with a meter instead.
Is it safe to unplug MC4 connectors on the roof?
Only after the DC disconnect is open and you have confirmed no current is flowing. Pulling a connector under load draws an arc that damages the contacts and presents a burn hazard. Verify first, every time.
What order do you bring the system back online?
Reverse the shutdown: DC disconnect closed, battery reconnected, inverter powered, AC breaker last. Watch for fault codes at each stage. Then compare production against your recorded baseline.
Do microinverter systems need the same procedure?
The sequence is the same, and module-level electronics may reduce voltage at each panel when the system de-energizes. Whether that happens depends on the specific hardware installed. Check the documentation and confirm with a meter rather than assuming.
