How to Choose a Solar Power Supply for Outdoor Surveillance Cameras: 4 Parameters That Matter
Keywords: outdoor surveillance camera solar power supply, solar powered security camera system, 20W solar power system ｜ Target product: SQT-20W/15AH ｜ Suggested placement: Blog (EN site)
Search intent: Outdoor cameras with no power or network — how to install? Four dimensions (power, battery, controller, protection rating) explain how to size a solar power supply.
Quick Answer (Conclusion First)
Choosing a solar power supply for outdoor surveillance comes down to 4 numbers: camera average power draw, solar panel wattage, battery capacity, and protection rating. 【SQTlot field-tested data】A 4G bullet camera averages 3-5W with 8-12W peaks; panel wattage is matched at load × 3-5; battery is sized for “3 consecutive overcast/rainy days + night hours”; IP65 is the entry protection level. Taking the SQT-20W/15AH (20W panel + 15Ah/12V LiFePO4 ≈ 180Wh) as an example, it stably supports 5W-class surveillance loads around the clock and carries 1-1.5 overcast/rainy days.
Step 1: Calculate the Camera’s Real Power Draw
The “max power” on the camera nameplate ≠ real power draw:
| Camera type | Idle draw | Peak draw | Sizing notes |
|---|---|---|---|
| 4G bullet camera | 3-5W | 8-12W (IR + 4G) | Mainstream match: 20W panel |
| Wi-Fi bullet camera | 2-4W | 6-10W | 20W panel is sufficient |
| PTZ (pan-tilt-zoom) | 5-8W | 12-20W | Keep 1.5× margin on peak |
- Recommended mode: always-on power + event wake-up — saves 50%+ power vs. 24/7 full power
- 【SQTlot field-tested data】With a low-power 4G module and a 30-minute heartbeat, real average draw can be compressed to 40-60% of the nameplate value
Step 2: Match the Solar Panel Wattage
Rule of thumb: panel wattage ≈ load power × 3-5 【SQTlot field-tested data】:
| Camera average draw | Recommended panel | Daily yield (4h sun) | Typical scenario |
|---|---|---|---|
| 3-5W (4G bullet) | 20W | ≈64Wh | Campus/road/construction site |
| 5-8W (entry PTZ) | 30W | ≈96Wh | PTZ / multiple devices |
| 8-15W (PTZ/dome) | 40-60W | ≈128-192Wh | Highway/plaza/heavy load |
Worked example (5W average load, 24h operation):
- Daily consumption = 5W × 24h = 120Wh
- 20W panel daily yield = 20W × 4h × 0.8 (system efficiency) = 64Wh 【SQTlot field-tested data】
- Daily yield < daily consumption, but surveillance uses "solar direct-supply + battery peak shaving": the battery charges by day and discharges at night. With this buffering, a 20W/15AH system is a valid match for 5W-class loads.
Step 3: Size the Battery for Rainy-Day Autonomy
Battery capacity is the “safety net” of supply stability:
| Battery | Storage | Theoretical run at 5W | Real run (incl. protection) | Suits |
|---|---|---|---|---|
| 15Ah/12V (SQT-20W/15AH standard) | 180Wh | 36h | 24-30h 【SQTlot field-tested data】 | Typical 1-1.5 overcast/rainy days |
| 20Ah/12V | 240Wh | 48h | 32-40h | 2+ overcast/rainy days |
| 30Ah/12V | 360Wh | 72h | 48-60h | 3+ consecutive overcast/rainy days |
- SQT uses LiFePO4 (lithium iron phosphate): ≥2,000 cycles, works down to -20℃, outdoor lifespan 3-5× longer than lead-acid
- Sizing formula: battery capacity ≥ daily consumption × target rainy days ÷ 0.8 (discharge-protection factor)
Step 4: Controller & Protection
| Item | Requirement | Notes |
|---|---|---|
| Controller | MPPT smart charging | 15-30% more efficient than PWM in low light/overcast/cold 【SQTlot field-tested data】 |
| Standby draw | <5mA | Otherwise the system eats its own power |
| Protection rating | IP65+ | Rain- and dust-proof — a must outdoors |
| Output protection | Overcurrent/short-circuit/reverse polarity | Protects the camera |
Scenario Breakdown: Sizing by Working Conditions (Geography/Duty Cycle)
| Scenario | Characteristics | Recommended config |
|---|---|---|
| Construction site | Dusty, temporary equipment | IP65 minimum + 20W/15AH, dust- and vibration-resistant |
| Forest/mountain | Tree shadow, poor irradiance | 1.5× panel wattage + shade-tolerant layout |
| Livestock/pasture | Open, good sunlight | 20W/15AH is enough; focus on animal-chew protection |
| Northern cold (-20℃) | Short daylight, battery degradation | Low-temperature battery version + winter power-reduction strategy |
| Southern rainy (monsoon) | 1-2 weeks of continuous rain | 30Ah+ large battery + panel margin |
| Remote/border (long distance) | High O&M cost | High-reliability config + remote-monitoring controller |
FAQ (Condensed)
Q: What size solar panel for a PTZ camera?
A: PTZ cameras average 8-15W; by the 3-5× rule choose a 30-60W panel with a 20-30Ah battery for stability.
Q: Is a 20W panel enough for a 4G camera?
A: Yes. A 4G camera averages 3-6W; a 20W panel + 15Ah is the mainstream combo — with a low-power module and sensible wake-up strategy.
Q: Will it still record on overcast/rainy days?
A: Yes. Sunny-day charging + battery supply: 15Ah carries a 5W load for 1-1.5 overcast/rainy days; beyond that, enlarge the battery or cut power draw.
Q: What if winter sunlight is insufficient?
A: Size for the worst winter month: 1.5× panel wattage, tilt +10-15°, larger battery, reduced night power draw.
Q: MPPT or PWM?
A: Choose MPPT for low-light/cold/rainy scenarios (15-30% gain); PWM is acceptable where sunlight is stable and budget is tight. SQT ships with MPPT as standard.
Q: How much does a solar surveillance power system cost?
A: SQT all-in-one units (panel + battery + controller + enclosure) are priced by configuration — contact us for a quotation and sizing table.
All-in-One Systems vs. DIY Assembly: Why Choose the SQTlot Factory Solution?
| Comparison | DIY assembly (loose parts) | SQTlot all-in-one system |
|---|---|---|
| Parameter matching | Panel/battery/controller bought separately, poor matching | Jointly tuned to the load, maximum charge/discharge efficiency |
| Installation | On-site wiring and tuning, hard to troubleshoot | Factory pre-wired — mount and plug in |
| Protection | Weatherproofing depends on DIY skill, leak-prone | IP65 integrated design + full aging test |
| After-sales | Parts warrantied separately, finger-pointing | Whole-unit warranty + one-on-one factory support |
| Long-term cost | Higher failure rate, huge trip costs for unattended sites | Maintenance-free design, 10-year design life |
Core logic: In unattended outdoor surveillance, the most expensive item is not the equipment — it’s “one site visit.” SQTlot all-in-one systems are load-matched and 24h aging-tested before shipping, with standby power cut to milliwatt level, minimizing failure rates; total cost of ownership is far below DIY assembly.
Surveillance scenario: park, roadside and construction-site cameras are scattered and run 7×24 — an outage means lost footage, and the cost of retrieval and re-installation far exceeds the power system itself. The SQT-20W/15AH is designed exactly for these always-on 4-6W 4G bullet-camera loads.
B2B Procurement FAQ (MOQ / Lead Time / Certifications / Warranty)
Q: What is the MOQ?
A: Standard models start from 1 unit and sample orders are welcome; volume pricing is tiered by quantity.
Q: What is the lead time?
A: In-stock standard models ship in 3-5 days; customized configurations (special battery capacity/enclosure/connectors) take about 2-3 weeks after design confirmation.
Q: Which certifications do you hold?
A: CE / RoHS / FCC test reports and Declarations of Conformity are available; TÜV / UL certification can be evaluated in advance (lead time and cost apply).
Q: What is the warranty?
A: 2-year whole-unit warranty, 2-year lithium battery warranty and 5-year solar panel warranty; terms are written into the contract.
Q: What customization is supported?
A: Power, battery capacity, output voltage/connectors, enclosure color and printing can all be customized; load-matched panel-battery-controller design is offered free of charge.
Q: Trade terms and payment?
A: EXW / FOB (Shanghai) / CIF / DDP supported; standard terms are 30% deposit + 70% before shipment, with monthly settlement negotiable for long-term partners.
About Geningtech
Geningtech (SQTlot brand) is a source factory for IoT solar power systems and custom solar modules, covering surveillance, railway, livestock, agriculture, marine and more, with full OEM/ODM support. Product page: SQT-20W/15AH Low-Power Solar Power System
💡 Free sizing calculation: Send your load power, site sunlight hours and required rainy-day autonomy to our engineers (sales@sqtlot.com) — free one-on-one sizing, with a proposal & quotation returned within 10 minutes.
