Solar panels do approximately nothing at night. The photovoltaic effect needs photons, and after sunset there aren't any worth counting. So what's actually happening on your roof between dusk and dawn? The inverter idles, the meter still spins, and if you have batteries, they're working overtime. Here's the full picture of a solar system in the dark, covering the full process.
TL;DR: Solar panels produce zero usable electricity at night because moonlight irradiance is roughly 0.001 W/m2 versus the 1,000 W/m2 reference for daytime panels, that's about 1/400,000th of peak (NREL data). A 400W panel under full moon outputs less than 0.0004W, far below any inverter's startup threshold. Grid-tied inverters drop into a low-power standby mode (1-5W draw from the grid) until DC panel voltage climbs at sunrise. Homes with batteries discharge through the evening; without batteries, the meter pulls from the grid for everything you use after sunset. The average US household consumes 28-30 kWh/day (EIA, 2022), with roughly half of that occurring in the 12 hours of darkness. A single Tesla Powerwall 3 covers most homes' overnight load on battery alone. For more on whether solar panels work, the underlying physics and battery sizing math are the same. The honest answer to "what do panels do at night?" is: nothing. The system around them does the work.
I once watched a customer call about their "broken" panels because the monitoring app showed zero output for 8 hours every night. The panels were fine. They were also doing what every silicon panel ever made does after dark: sitting there. Sometimes the most useful thing I can tell a new solar owner is what a normal nighttime curve looks like.
What Actually Happens to Solar Panels in the Dark?
Standard silicon solar panels generate close to zero watts at night because the photovoltaic effect requires photon energy above the silicon bandgap of 1.12 eV (NREL). Moonlight delivers about 0.001 W/m2 of irradiance versus the 1,000 W/m2 STC reference, so output drops 6 orders of magnitude. The panel is still a working semiconductor diode, it just isn't being illuminated.
What's measurable? Practically nothing. A 400W residential panel under a clear full moon produces roughly 0.0004W. That's enough to register a tiny voltage across the cells if you put a sensitive multimeter on the output, but it's far below the minimum DC input voltage any modern inverter needs to start converting power.
What's the panel temperature doing? Dropping fast. Without sunlight to warm the laminate, panels cool to ambient (or slightly below ambient through radiative cooling to the night sky) within an hour of sunset. The cells reach their thermal equilibrium with the environment. Cold cells produce slightly more rated output per photon than warm cells (the -0.30%/deg C temperature coefficient of TOPCon), which is why dawn produces a small efficiency bump as the sun comes up before panels heat. But none of that matters at zero light.
Why does this even surface as a question? Because homeowners watching real-time monitoring see the production 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 a low-power standby mode. Grid-tied inverters monitor DC voltage from the panel string continuously, and when that voltage falls below the inverter's startup threshold (typically 60-150 V DC depending on the model), the inverter disengages from power conversion. It doesn't shut down completely, it stays alert enough to detect sunrise and re-engage.
Standby power draw runs 1-5 W on most residential inverters, pulled from the AC grid rather than panels. Over 12 nighttime hours, that's 12-60 Wh per day of "tare loss" or "vampire load." Across a year, 4-22 kWh, less than 1% of annual production for any reasonable residential system. Not worth worrying about.
Some older inverter models disconnected completely at night to save that standby power. Modern firmware almost always keeps the monitoring electronics live to send data, log events, and maintain the connection to the cloud platform. Anyone wondering why their Enphase Envoy or SolarEdge gateway still shows "online" at 2 AM, that's why.
Microinverters behave a little differently. Each individual microinverter (Enphase IQ8A, IQ8M) drops to standby when its single panel falls below voltage threshold. They wake one-by-one at dawn as light reaches each panel. String inverters drop the whole system at once when the lowest panel pulls the string below threshold.
What about hybrid inverters with battery support? Those stay active continuously, managing battery discharge to the home load and monitoring grid voltage. The SolarEdge Home Battery 10 kWh and Tesla Powerwall 3 both integrate with hybrid inverters that 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 on the side of the house spins forward whenever the utility is supplying power and backward (or accumulates credit, depending on the meter type) whenever solar is exporting surplus during the day. The transition between net-export and net-import happens automatically as solar production rises in the morning and falls in the evening.
The math runs like this. The average US home consumes 28-30 kWh per day (EIA, 2022), with about 50% of that load happening between 6 PM and 6 AM. So roughly 14-15 kWh of grid draws per night on average. At an average residential electricity price of $0.16/kWh (EIA national average mid-2025), that's $2.20-$2.40 per night of grid power costs.
Net metering offsets that draw across the billing cycle. Daytime export credits (kWh exported to the grid) reduce the kWh you pay for at the end of the month. 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. The grid effectively acts as a free seasonal battery.
California's NEM 3.0 changed this calculation in 2023, cutting average export credits from roughly $0.30/kWh to $0.04-0.08/kWh, about a 75% reduction. Homeowners installing solar in California after April 2023 increasingly pair systems with batteries to self-consume daytime production rather than exporting at low rates.
How Do Batteries Cycle Through the Night?
Battery-equipped solar systems run an automated charge-discharge cycle anchored to sunset. During the day, surplus production charges the battery. As production drops below home consumption (typically late afternoon), the battery starts discharging to cover household loads. Discharge continues until either the battery hits its minimum reserve (usually 10-20%) or sunrise restarts solar generation.
A typical evening profile looks like this:
- 5 PM: solar production falling, battery starts discharging at 1-2 kW
- 7-9 PM: peak load (cooking, lights, TV), battery output 2-4 kW
- 10 PM-midnight: load drops to baseline 0.5-1 kW
- 2-5 AM: minimum load 0.3-0.5 kW (fridge cycling, standby)
- 6 AM: solar begins, battery may continue covering load until production exceeds consumption
A 13.5 kWh Tesla Powerwall 3 covers a full overnight load for most US households if the day produced enough surplus to fully charge. Two Powerwalls (27 kWh) buy multi-day resilience. For deeper sizing analysis, our off-grid solar system packages guide covers real-world configurations from 15 to 60 kWh.
What if the battery runs out at 3 AM? Grid-tied hybrid systems automatically draw from the utility once the battery hits minimum state of charge. Off-grid systems either run a backup generator or simply have a power gap until sunrise. The hybrid configuration is by far the most common in residential installs because it sidesteps the worst-case scenarios.
Why Do Some People Think Solar Panels Generate Power at Night?
Three persistent misconceptions, all worth clearing up:
Streetlight or moonlight production. Both deliver irradiance well below the inverter wake threshold. A panel sitting under a sodium streetlamp registers microvolts on a sensitive meter but the inverter never starts. Internet videos showing "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. Real research exists on this. Stanford published a peer-reviewed study in 2022 demonstrating thermoradiative panels that generate roughly 100 mW/m2 at night from the temperature difference between a warm panel surface and the cold night sky (iScience, 2022). That's about 2,000 times less than daytime silicon. The technology is genuinely interesting science but commercially nonexistent in 2026, our piece on why solar panels don't work at covers the physics and the real-world relevance.
"Solar panels that work in the dark" marketing claims. These are almost always either thermoradiative research being misrepresented, or panels paired with batteries where the battery is doing the work. If a product claims meaningful nighttime PV generation in 2026, treat the claim with deep skepticism.
The real question to ask anyone selling a nighttime solar product: 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 residential monitoring screen shows zero production from civil twilight to civil twilight the next morning, with a fast ramp at sunrise and a slow taper at sunset. Inverters often produce trace amounts of power (1-10W) for 15-30 minutes after sunrise and before sunset, this is the bottom of the production curve where panel voltage is just barely above inverter 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 cast onto the panels. The numbers are tiny and usually average out at zero across hourly bins, but they can confuse owners reading second-by-second data. The system isn't actually exporting power anywhere, the inverter isn't running. The current sensor is just picking up cell-level voltage fluctuations from ambient light.
For more context on how cloudy conditions, sunset transitions, and seasonal variability shape system output, see our piece on increasing solar PV yield by 20.
Citation capsule: Solar panels produce essentially zero electricity at night because the photovoltaic effect requires photon energy above silicon's 1.12 eV bandgap. Moonlight delivers only about 0.001 W/m2 of irradiance versus the 1,000 W/m2 standard test condition for daytime panels (NREL). A grid-tied inverter drops into low-power standby mode (typically 1-5W draw from the AC grid) when DC voltage from the panel string falls below the inverter's startup threshold, restarting automatically at sunrise.
Summary
Solar panels do nothing useful at night. The inverter sits in standby pulling a watt or two from the grid for monitoring electronics. Without batteries, every appliance in the house runs on grid electricity from sunset to sunrise. With batteries, the storage discharges to cover load through the evening and falls back to the grid at minimum state of charge. The average US household pulls 14-15 kWh from the grid (or battery) overnight. Net metering offsets that draw in many states; California NEM 3.0 reduced export credits dramatically in 2023, pushing battery economics to the front. Anyone shopping for nighttime production should know: real PV doesn't generate after dark, and the products that claim to are either misrepresenting research or relying on storage. For battery sizing and the math behind nighttime coverage, see our piece on whether solar panels can work at.