You log in after a long session hauling loot from the Launch Site. Your base is pitch black. You fumble for a switch, flip it on, and immediately wonder why you didn't automate this weeks ago. One small circuit — three components beyond your solar panel — and your lights will handle themselves for the rest of the wipe.
The trick is using an Electrical Blocker as a logic gate and a Solar Panel as a live day/night sensor. No timers. No switches. No maintenance. The sun goes down and the lights come on — every single night.
Test this circuit on RUSTPVE.com — no stress, no raids, just build and experiment. US and EU servers are online 24/7.
Three Ways to Wire Lights in Rust
Before diving into the auto circuit, here's a quick comparison of your three options. Each has its place depending on your materials and goals.
Manual Switch
Run power through a Switch. Flip it on at night, off in the morning. Simple, free, and requires you to actually remember to do it every single day.
Timer Loop
A Timer cycling on and off on a fixed schedule. Works without solar but doesn't track actual daylight — it can fire at the wrong time or drift over multiple wipes.
Day/Night Sensor
Uses a Solar Panel as a live day detector. The Blocker auto-cuts lights at sunrise and restores them at dusk. Syncs perfectly with Rust's actual cycle. Zero upkeep.
This guide covers the Day/Night Sensor method — the elegant solution that always stays in sync with the in-game day/night cycle and requires nothing from you after the initial setup.
How the Day/Night Auto Lighting Circuit Works
The circuit is built on one key property of the Electrical Blocker: it completely blocks power from reaching its output whenever it receives any signal on its Block Passthrough input. When that Block Passthrough drops to zero, the Blocker opens and power flows freely.
A Solar Panel generates power during daylight and falls to exactly zero at night. By routing a tiny portion of that solar output to the Blocker's Block Passthrough input, you've wired a real-time day/night detector:
- ☀ Daytime: Solar Panel generates power → 1 rW reaches Block Passthrough → Blocker is closed → Lights stay OFF
- 🌙 Nighttime: Solar Panel = 0 rW → Block Passthrough has no signal → Blocker opens → Power flows to lights → Lights turn ON
Why the Electrical Branch? The Blocker only needs 1 rW on its Block Passthrough to activate. An Electrical Branch lets you set exactly how much of your solar output goes to the block signal — typically just 1 rW — while the remaining solar power flows out through Power Out to the rest of your base or into the Infinite Power Loop.
Component List
| Component | Qty | Role in the Circuit | Craft Cost |
|---|---|---|---|
| Solar Panel | 1 | Acts as the day sensor — generates 20 rW peak in clear weather, drops to 0 at night | 75 Metal Frags |
| Electrical Branch | 1 | Splits the solar output — sends 1 rW to the Blocker's Block input, routes the rest to your base | 75 Metal Frags |
| Electrical Blocker | 1 | Core logic gate — closed during the day (blocked), open at night (passing power) | 75 Metal Frags |
| Large Battery | 1 | Main power source for the lights, or use the output from your Infinite Power Loop | 150 Metal Frags + 3 HQM |
| Ceiling Lights | As needed | 2 rW each — wire to the Blocker's Power Out via a distribution chain or branch tree | 25 Metal Frags each |
| Wiring Tool + Wire | 1 + rolls | Required to connect all components | — |
Step-by-Step Wiring Guide
-
1
Mount and position the Solar Panel (day sensor)
Place the Solar Panel on your roof or an elevated structure with full sky exposure. It must face skyward to generate output. A standard panel produces roughly
20 rWpeak on a clear day — the exact amount doesn't matter for this circuit. You just need it to be above 0 rW during daylight and exactly 0 rW at night. -
2
Place the Electrical Branch and connect it to the Solar Panel
Position the Electrical Branch anywhere accessible — inside your base works fine. Run a wire from the Solar Panel's Power Out into the Branch's Power In. This is the starting point of your day-detection signal chain.
-
3
Set Branch Out to 1 rW
Interact with the Electrical Branch and set the Branch Out value to
1. This is the minimum needed to activate the Blocker's block signal. Keeping it at 1 rW means you're barely touching your solar budget — the remaining power flows out through Power Out to your base circuit or Infinite Power Loop. -
4
Wire Branch Out → Blocker's Block Passthrough input
This is the critical connection. Run a wire from the Branch's Branch Out to the Blocker's Block Passthrough input. When the solar panel is active, 1 rW travels this wire and tells the Blocker to close. When solar drops to 0 at night, no signal reaches Block Passthrough and the Blocker automatically opens.
-
5
Connect your main power source to Blocker's Power In
Wire your Large Battery output — or the output of your Infinite Power Loop — into the Blocker's Power In. This is the power that will flow through to the lights when the Blocker opens at night. Make sure your battery is charged or your loop is running.
-
6
Run Blocker Power Out to your lights or distribution point
Wire the Blocker's Power Out to your first Ceiling Light, or to an Electrical Branch that fans the power out to multiple lights. For small setups, daisy-chain lights in series — each light passes remaining power to the next. For large setups, use a branch tree for cleaner distribution.
-
7
Wire up all your Ceiling Lights
Each Ceiling Light uses
2 rWand passes remaining power forward. For a chain of 10 lights you need at least20 rWavailable. Calculate your total load before placing everything — see the Power Math section below. -
8
Test the circuit
If it's daytime, temporarily block the Solar Panel's sky view (place a foundation or roof tile on top of it) — within 1–2 seconds the panel drops to 0, the block signal disappears, and your lights should turn on. Remove the obstruction to restore the panel and simulate sunrise. This is the fastest way to test without waiting for the actual night cycle.
Circuit Diagram
Integrating with the Infinite Power Loop
The auto lighting circuit and the Infinite Power Loop are designed to work together. When combined, your entire base operates automatically — day and night — without a single manual input.
Here's how to combine them:
- Power Loop's A/B Switch output feeds into the lighting Blocker's Power In
- A dedicated small Solar Panel (one dedicated to the day-sensor role) OR a 1 rW tap from your Loop's Branch 1 Branch Out → feeds the lighting Blocker's Block Passthrough
- Blocker's Power Out → your lights distribution
The result is a fully automated base. When the sun sets: (1) the Infinite Power Loop switches from solar to battery via its A/B Switch, and (2) the lighting Blocker loses its block signal simultaneously and turns the lights on. Sunrise reverses both. Your base goes from day mode to night mode on its own — every single in-game cycle.
Haven't built the Infinite Power Loop yet? Start with the full guide — building both circuits in the same session is much cleaner than retrofitting the lighting circuit later.
Power Math
Calculate whether your power source can handle your lighting load before placing 20 lights and discovering you're 10 rW short.
12 lights × 2 rW = 24 rW (night draw only)
Large Battery capacity: 100 rW stored
100 rW ÷ 24 rW/hour = ~4.2 hours of standalone runtime
With Infinite Power Loop recharging during the day: unlimited runtime
(requires daily solar input ≥ 24 rW × nighttime hours)
Lights draw zero power during the day. Because the Blocker cuts power while the sun is up, your lights cost you nothing from sunrise to sunset. A modest solar setup easily sustains extensive lighting with no strain on the battery budget.
Rust Light Types & Power Costs
| Light Item | Power Cost | Output | Best For |
|---|---|---|---|
| Ceiling Light | 2 rW | Bright, wide | Interior rooms, hallways, main living areas |
| Simple Light (bulb) | 1 rW | Dim, point | Accent lighting, closets, stairwells |
| Flasher Light | 1 rW | Pulsing | Entry warnings, perimeter alerts |
| Strobe Light | 1 rW | Rapid flash | Effects, nightclub builds, events |
| Neon Sign (Small) | 2 rW | Glow | Signage, shop labels, base branding |
| Neon Sign (Medium) | 3 rW | Glow | Entrance signs, base identifiers |
| Neon Sign (Large) | 4 rW | Bright glow | Landmark bases, community builds |
| Disco Floor | 3 rW | Colour-shift | Entertainment, PVE base aesthetics |
Troubleshooting
Lights stay ON all day — Blocker never blocks. Check: (1) Is the Solar Panel mounted with sky exposure? (2) Is the Branch Out wired to the Blocker's Block Passthrough input specifically — not Power In? (3) Is the Branch Out value set to at least 1 rW? (4) Are you in daylight right now?
Lights never turn on at night. Check: (1) Is your battery charged, or is the power loop running? (2) Is the power source wired to Blocker's Power In — not Block Passthrough? (3) Is the Blocker's Power Out wired to the first light's Power In? Disconnect the Block Passthrough wire temporarily — if lights turn on immediately, the block signal isn't dropping at night (likely solar panel obstruction).
Only the first few lights turn on. You're running out of power partway through the chain. Each Ceiling Light needs 2 rW. Check your battery charge and total available power. Use the Power Math section to calculate your exact requirement before adding more lights.
Quick test trick: Place a foundation on top of your Solar Panel to block its sky view. Within a second or two the panel drops to 0 rW, the block signal disappears, and your lights should turn on. Remove the foundation to restore the panel. Much faster than waiting for the actual in-game night cycle.
Final Tips
- Use a dedicated solar panel as the day sensor rather than tapping your main power circuit — it keeps the day-detection logic isolated and failure-proof
- Wire exterior perimeter lights separately from interior lights using two Blocker outputs (or a second Blocker) — gives you independent control if needed
- Chain lights efficiently for small setups; use Electrical Branch trees for large setups with 10+ lights across multiple rooms
- Add a manual override Switch downstream of the Blocker if you ever need to force lights off at night — the auto circuit stays as the default and the switch overrides it when needed
- Combine with the Infinite Power Loop so battery levels never concern you — the loop recharges all day, lights run all night, and the whole system handles itself indefinitely
Wire it up on RUSTPVE.com — no pressure, no raids, experiment as long as you like. Connect on US or EU servers →