The architecture
Two 100W rigid panels form or sit above a small shade canopy. A 50Ah LFP battery and controller live in a locked under-table box. DC USB-C modules and LEDs run from a covered fuse block.
Load and sizing math
Phone charging is tiny compared with almost any other solar project, so panel area is selected partly for useful shade and fast recovery.
| Load | Watts | Hours/day | Daily Wh | Notes |
|---|---|---|---|---|
| USB-C charging | 80 | 4 | 320 | Several devices |
| LED lighting | 20 | 4 | 80 | Evening |
| Controller/indicator | 1 | 24 | 24 | Always on |
| Illustrative total | 424 Wh/day | Before system margin | ||
About 424Wh on a very busy day. A 50Ah battery stores ~640Wh nominal; 200W of solar can recover it quickly.
Full parts list
This is a shopping architecture, not a demand that you buy one exact brand. Match voltage, current and connectors before ordering. Budget ranges reflect the class of hardware rather than a live quote.
200W rigid solar
Target spec: 2×100W canopy panels
Power plus useful shade.
Budget: $100–$260 each
50Ah LiFePO4
Target spec: 12.8V
Compact locked storage.
Budget: $100–$180 each
20A controller
Target spec: LFP, load output
Charges battery and protects loads.
Budget: $50–$120 each
USB-C PD modules
Target spec: 12V input, 45–65W class
Modern phone/tablet charging.
Budget: $30–$100 each
12V warm LED fixtures
Target spec: Vandal-resistant if public
Evening table light.
Budget: $20–$80 each
Locking under-table enclosure
Target spec: Weatherproof/tamper-resistant
Protects battery and controller.
Budget: $60–$200 each
Wiring map
Keep all user-accessible outlets low voltage and put fuses/controller/battery behind a locked panel.
[200W CANOPY PV]-->[CTRL]-->[50Ah LFP]-->[FUSED BUS]
| |
USB-C PD LED lights
Step-by-step build
Engineer the shade structure
Panels create wind load. Use real posts/bracing rather than screwing modules to a decorative frame.
Mount panels with drainage gap
Allow water to drain and cables to stay protected from table users.
Install locked power box
Mount under the bench/table where splash is minimized and ventilation is adequate.
Wire controller and battery
Fuse battery positive close to the terminal.
Install user outlets
Use covered USB-C outlets and avoid exposed cigarette-lighter sockets in public installs.
Add lighting
Aim fixtures down to reduce glare and insects.
Load-test every port
Plug multiple devices in simultaneously and verify buck/USB modules do not overheat.
Weather-test
Spray-test enclosures and inspect after the first heavy rain.
Commission it before you trust it
The project is not finished when the LED comes on. Run it through a controlled test so the first real failure is not in the field.
- Canopy wind bracing secure
- Panel edges protected
- Battery box locked
- USB outlets covered
- All branches fused
- No exposed AC
- Night lighting glare controlled
- Drainage paths clear
- Public-use labels installed
Mistakes to avoid
Undersizing the battery because the panel is large
Panels make energy only when conditions cooperate. The battery has to carry the load through night, cloud and short high-demand events. Size energy storage from watt-hours, not panel watts.
Ignoring standby loads
Controllers, routers, cameras, inverters and cellular hardware can consume power 24/7. On small projects, a 5W always-on device is 120Wh per day—sometimes more than the 'main' load.
Using one fuse for the entire project
Fuse each branch according to its conductor and load. The fuse protects wire, not the gadget. A downstream short should not require an oversized main fuse to clear.
Mounting the panel where the project is instead of where the sun is
The load can sit in shade. The panel cannot. Use a cable run, pole or remote mount to put the collector in the best solar window.
Skipping a low-voltage disconnect
Deep-discharge protection is cheap insurance. Many charge controllers or smart battery systems can disconnect noncritical loads before the battery is abused.
Upgrade path
Add Qi charging pads
Useful on a private table, though outdoor durability is lower.
Add an e-bike charging locker
This pushes the project into inverter/large-battery territory.
Add a Wi‑Fi access point
The spare energy can power a low-watt outdoor AP if networking is available.
Frequently asked questions
Can the panels be the roof?
Yes if mounting/drainage/wind structure is designed for it; do not treat module frames as structural beams.
Do I need a 50Ah battery?
For phone charging alone, smaller works; 50Ah provides evening lighting and cloudy-day reserve.
Can this be installed in a public park?
Electrical, structural, accessibility and vandal-resistance requirements may apply; coordinate with the property authority.
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