Solar panels do approximately nothing at night. Short answer: output falls to zero watts, the inverter drops into a 1-5 W standby mode, and even a full moon's 0.001 W/m2 of light (versus 1,000 W/m2 at midday) coaxes under 0.0004 W from a 400 W panel. So what's actually happening on your roof between dusk and dawn? The inverter idles, the meter still spins, and if you've got batteries, they're working overtime. For more on whether solar panels work after dark, the physics and battery math are the same.
I once fielded a call about "broken" panels because the monitoring app showed zero output for 8 hours every night. The panels were fine, doing what every silicon panel ever made does after dark: sitting there. Sometimes the most useful thing I can tell a new owner is what a normal nighttime curve looks like.
What Actually Happens to Solar Panels in the Dark?
Standard silicon panels generate close to zero watts at night because the photovoltaic effect needs photon energy above silicon's 1.12 eV bandgap (NREL). Moonlight delivers about 0.001 W/m2 versus the 1,000 W/m2 STC reference, so output drops 6 orders of magnitude. A 400W panel under a clear full moon produces roughly 0.0004W, enough to register a tiny voltage on a sensitive multimeter but far below the DC input any inverter needs to start converting power. The panel is still a working semiconductor diode; it just isn't lit.
Panel temperature drops fast. Without sunlight, panels cool to ambient (or slightly below, through radiative cooling to the night sky) within an hour of sunset. Cold cells produce slightly more output per photon than warm ones (the -0.30%/deg C coefficient of TOPCon), which is why dawn brings a small efficiency bump before panels heat up. None of it matters at zero light. Homeowners watching real-time monitoring see the curve flat-line at sunset and worry something broke. The flat line is the system working exactly as designed.
What Does the Inverter Do at Night?
The inverter drops into low-power standby. Grid-tied inverters monitor DC string voltage continuously, and when it falls below the startup threshold (typically 60-150 V DC), the inverter disengages from power conversion while staying alert enough to detect sunrise. Standby draw runs 1-5 W, pulled from the AC grid, not the panels. Over 12 nighttime hours that's 12-60 Wh a day of vampire load, 4-22 kWh a year, under 1% of annual production. Not worth worrying about. Modern firmware keeps the monitoring electronics live to log data and hold the cloud connection, which is why your Enphase Envoy or SolarEdge gateway still shows "online" at 2 AM.
Microinverters differ slightly. Each one (Enphase IQ8A, IQ8M) drops to standby when its own panel falls below threshold and wakes one by one at dawn, while a string inverter drops the whole system at once. Hybrid inverters with battery support stay active continuously, managing battery discharge and monitoring grid voltage. The SolarEdge Home Battery 10 kWh and Tesla Powerwall 3 both handle this transition automatically.
How Do Grid-Tied Homes Get Power Overnight?
Grid-tied homes without batteries pull from the utility for everything after sunset. The meter spins forward when the utility supplies power and backward (or accrues credit) when solar exports surplus during the day, switching automatically as production rises and falls.
The math: the average US home consumes 28-30 kWh per day (EIA, 2022), with about 50% of that between 6 PM and 6 AM, so roughly 14-15 kWh of grid draw per night. At $0.16/kWh (EIA national average mid-2025), that's $2.20-$2.40 per night.
Net metering offsets that draw across the billing cycle. In states with full retail net metering (much of New York, Massachusetts, parts of the Midwest), 1 kWh exported at noon offsets 1 kWh imported at midnight, so the grid acts as a free seasonal battery. California's NEM 3.0 changed that in 2023, cutting export credits from roughly $0.30/kWh to $0.04-0.08/kWh, about 75%. Homeowners installing there after April 2023 increasingly add batteries to self-consume rather than export at low rates.
How Do Batteries Cycle Through the Night?
Battery systems run an automated charge-discharge cycle anchored to sunset. Surplus daytime production charges the battery; as production drops below consumption (typically late afternoon), the battery discharges to cover loads until it hits minimum reserve (usually 10-20%) or sunrise restarts generation. A typical evening ramps from 1-2 kW discharge at 5 PM to a 2-4 kW peak load (cooking, lights, TV) at 7-9 PM, then tapers to 0.5-1 kW by midnight and 0.3-0.5 kW (fridge cycling, standby) by 3 AM.
A 13.5 kWh Tesla Powerwall 3 covers a full overnight load for most US households if the day charged it fully. Two Powerwalls (27 kWh) buy multi-day resilience. Our off-grid solar system packages guide covers configurations from 15 to 60 kWh.
What if the battery runs out at 3 AM? Grid-tied hybrid systems draw from the utility automatically once the battery hits minimum state of charge. Off-grid systems run a backup generator or have a power gap until sunrise. Hybrid is by far the most common residential setup because it sidesteps the worst case.
Why Do Some People Think Solar Panels Generate Power at Night?
Three persistent misconceptions:
Streetlight or moonlight production. Both fall well below the inverter wake threshold. A panel under a sodium streetlamp registers microvolts but the inverter never starts. Videos of "moonlight solar" usually involve a small load and a hand-wired bypass of the inverter, which isn't how a grid-tied system works.
Thermal panels that work at night. Stanford published a 2022 study demonstrating thermoradiative panels generating roughly 100 mW/m2 at night from the temperature gap between a warm panel and the cold sky (iScience, 2022), about 2,000 times less than daytime silicon. Interesting science, commercially nonexistent in 2026; our piece on why solar panels don't work at night covers the physics.
"Solar panels that work in the dark" marketing. Almost always misrepresented thermoradiative research or panels where a battery does the work. Ask the seller: what's the rated output at midnight, and where's the third-party test data?
What Does Nighttime Behavior Look Like in Real Monitoring Apps?
A typical monitoring screen shows zero production overnight, with a fast ramp at sunrise and a slow taper at sunset. Inverters often produce trace power (1-10W) for 15-30 minutes after sunrise and before sunset, the bottom of the curve where panel voltage is barely above threshold.
| Time | Solar production | Inverter status | Grid flow (no battery) |
|---|---|---|---|
| 6 PM (sunset) | 200-500 W | Active, dropping | Slight import |
| 7 PM | 0 W | Standby | Full import |
| 10 PM | 0 W | Standby | ~1 kW import |
| 3 AM | 0 W | Standby | ~0.5 kW import |
| 6 AM | 50-150 W | Active, climbing | Slight import |
| 8 AM | 800-1500 W | Active, climbing | Export starts |
What about LED-driven false readings? Some cheap monitoring systems show "production" at night when streetlights or porch lights hit the panels. The numbers are tiny and average out at zero across hourly bins, but they can confuse owners reading second-by-second data. Nothing is exported anywhere; the current sensor just picks up cell-level voltage fluctuations from ambient light.
For how cloudy conditions and seasonal variability shape output, see increasing solar PV yield by 20 percent.
Summary
Solar panels do nothing useful at night. The inverter sits in standby pulling a watt or two from the grid. Without batteries, every appliance runs on grid electricity from sunset to sunrise; with batteries, storage covers the evening load and falls back to the grid at minimum charge. The average US household pulls 14-15 kWh overnight. Net metering offsets that draw in many states, though California's NEM 3.0 cut export credits sharply in 2023, pushing battery economics to the front. Real PV doesn't generate after dark, and products claiming otherwise are misrepresenting research or leaning on storage.