How to Install Solar Christmas Lights, Step by Step

To install solar Christmas lights, charge the set in full sun for 8 to 12 hours first, then stake or mount the panel where it gets direct sun for most of the day. Hang the string with clips or hooks, not nails, switch it on and cover the panel to confirm the sensor works.

The steps below apply to string, icicle and net sets that have a separate panel on a lead wire. Sets with a panel on each light, such as stake lights, skip steps 3 and 4. For help choosing a set first, see our guide to the best solar Christmas lights.

What you need before you start

• The light set, its panel, the panel stake or mounting bracket, and the manual
• Plastic light clips, gutter hooks or insulated staples
• A tape measure, to check the lead wire reaches from the panel spot to the display
• A stable ladder if any lights go above head height, plus a second person to steady it

Read the manual’s switch and mode section before you go outside. Many sets have an off/on switch and a mode button on the back of the panel.

Step-by-step installation

Step 1: Remove the pull tab and give it a first charge

New sets often ship with a small plastic tab between the battery and its contact, according to lighting retailer Festive Lights. Pull it out, then leave the panel in full sun. EnergySage reports that brands recommend 8 to 12 hours of sunlight before the first use.

Step 2: Inspect the string

The U.S. Fire Administration advises inspecting holiday lights each year before putting them up and throwing away strands with frayed or pinched wires. The CPSC adds broken or cracked sockets and loose connections to the list. Solar sets run on low voltage, but a damaged wire can still stop the set working.

Step 3: Find the panel’s spot

Stand where the display will go at midday and look for the patch with open sky to the south. The Department of Energy notes solar panels perform best facing south. Avoid spots under eaves, evergreen branches or near a porch light.

Gama Sonic warns that porch, garage, street or neighbors’ lights shining on the sensor can keep a solar light off. If the panel has the sensor built in, keep it out of that glow.

Step 4: Mount or stake the panel

Push the stake into soft ground, or screw the bracket to a fence post or railing if the kit includes one. Tilt the panel toward the sun. Run the lead wire along the ground or fence so nobody trips over it.

Step 5: Hang the lights

The CPSC advises using only insulated staples, not nails or tacks, or running strings through hooks. Start at the end nearest the panel so the lead wire does not come up short.

For eaves and gutters, work from a ladder on firm, level ground. CPSC data found falls were the most frequent holiday decorating incident, at 41%. Our guide to solar lights for roofs and gutters covers clip types and panel spots for rooflines.

Step 6: Switch on and test the sensor

Set the switch to on and pick a mode. Then cover the panel completely with your hand or a dark cloth. Festive Lights and Gama Sonic both describe this test: covering the sensor mimics night, so the lights should come on.

Step 7: Watch the first three nights

Note when the lights turn off each night. A set that shuts off early after sunny days usually needs a better panel spot. See how long solar Christmas lights stay on for what to expect in December.

Solar Christmas light sets with separate panels

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Common installation mistakes

Mistake	What happens	Fix
Skipping the first full charge	Lights are dim or off the first night	Leave the panel in sun for a full day first
Panel under the eaves	Little direct sun reaches it	Stake the panel in the open and extend the run with the lead wire
Panel near a porch light	Sensor thinks it is daytime	Move or shield the panel from other lights
Nails or tacks through the wire	Damaged insulation, dead sections	Use insulated staples, clips or hooks (CPSC)
Switch left off after charging	Nothing lights at dusk	Check the switch on the back of the panel

Installing on a balcony or small space

Apartment balconies change the panel problem: you often have one wall of sky, not a whole yard. Railing mounts and window-facing spots are covered in our guide to solar Christmas lights for balconies.

If the lights still refuse to come on after all seven steps, work through our troubleshooting checklist for solar Christmas lights.