⚡ Modular Solar CCTV Sizing Engine
Off-Grid Solar PTZ Camera & Battery Sizing Calculator
Calculate recommended solar panel wattage (modular 100W/120W/150W/200W panels), LiFePO4 battery capacity (Ah/Wh up to 7 days autonomy), and MPPT charge controller for continuous camera power draw and regional peak sun hours.
⚙️ 1. Engineering Sizing Inputs
Daytime Camera Power (P_day)
Optical stream / standby
W
Standard PTZ (24W/42W)
Thermal PTZ (35W/65W)
Compact PTZ (12W/18W)
Long-Range 55x (45W/80W)
Nighttime Camera Power (P_night)
Laser/IR illuminators active
W
Motion Detection / Patrol Duty Cycle
Continuous vs Triggered
Factor
1.0 (24/7 Continuous Recording)
0.85 (Motion-Triggered AI Patrol)
1.15 (Heavy Pan-Tilt Tracking)
Worst-Month Peak Sun Hours (PSH)
Winter minimum irradiance
Hours/day
2.0h (Northern Winter / Overcast)
3.0h (Moderate Climate)
4.5h (Arid / High-Sun Zone)
Continuous Rainy/Cloudy Days Autonomy
Standard max 7 days
Days
1 Day (Basic)
2 Days (Recommended)
3 Days (High Reliability)
5 Days (Critical Security)
7 Days (Extreme Remote Max)
Preferred Solar Panel Wattage Selection
Modular factory panels
100W Panel
120W Panel
150W Panel
200W Panel
📊 2. Sizing Recommendations
Factory-verified for 99.8% off-grid uptime
Daily Energy Consumption
553.0 Wh/day
553 Wh
Equivalent average continuous load: 23.0W
Solar PV Array Recommendation
Min: 395W
2 × 200W (400W)
Configured using modular 200W monocrystalline panels
LiFePO4 Battery Bank (Autonomy)
12.8V / 25.6V Nominal
12.8V 150Ah
Total energy: 1,920 Wh (95% DoD, 80% line efficiency)
MPPT Charge Controller
12V/24V Auto
30A MPPT
Max PV Input Voc < 100V, RS485 / Modbus monitoring
Engineering Sizing Principles & Formulas
Mathematical rigor behind Fengtaida's factory-tested off-grid solar surveillance designs.
Direct Answer: How Off-Grid CCTV Sizing Works
Off-grid solar surveillance sizing requires a two-part energy balance: (1) Sizing the solar array to harvest enough daily watt-hours (Wh) during the shortest winter day to power 24-hour camera operation plus replenish battery storage, and (2) Sizing the lithium (LiFePO4) battery bank to sustain continuous operation throughout 1 to 7 consecutive zero-sun overcast days without dropping below 95% depth-of-discharge (DoD).
1. Daily Energy Consumption (E_day)
E_day = (P_day × 10h + P_night × 14h) × K_duty
Accounts for elevated night power when IR/laser illuminators and thermal sensors are active.
2. Required PV Array Wattage (P_pv)
P_pv = E_day / (PSH × 0.70_eff)
Incorporates 30% aggregate system losses: dust derating, MPPT tracking efficiency, and wiring voltage drop.
3. LiFePO4 Battery Capacity (C_bat)
C_bat (Ah) = (E_day × Days) / (V_bat × 0.95 × 0.80)
Sizes battery capacity for 1–7 autonomy days factoring in 95% Depth of Discharge and 80% inverter/BMS conversion.
4. MPPT Controller Sizing (I_mppt)
I_mppt = (P_pv / V_bat_nominal) × 1.25_safety
Applies 1.25× NEC safety headroom to prevent controller overcurrent tripping during high cold-weather solar irradiance.
6-Step Sizing & Verification Methodology
Standard engineering sequence recommended for EPC security contractors and deployment engineers.
Step 1
Measure Day & Night Power
Obtain true power draw with PTZ pan/tilt active and IR lasers fully powered at max zoom range.
Step 2
Lookup Local Winter PSH
Query NASA SSE or local meteorological irradiance databases for the worst-case month (typically December/January).
Step 3
Select Modular Solar Panels
Match total wattage to standard 100W, 120W, 150W, or 200W panel increments to minimize pole wind load.
Step 4
Determine Battery Autonomy
Select 1 to 7 consecutive cloudy days based on regional climate and site accessibility for maintenance.
Step 5
Verify Low-Temperature BMS
Ensure LiFePO4 batteries feature internal heating blankets if ambient temperatures drop below 0°C (32°F).
Step 6
Validate Pole Mechanical Load
Calculate wind torque on solar brackets and choose SUS304 reinforced mounts for typhoon/storm compliance.
Reference Configurations for Typical Industrial Deployments
Standardized factory configurations validated in oil & gas pipelines, coastal border perimeters, and remote solar farms.
| Surveillance Application | Typical Load | Solar Panel Array | LiFePO4 Battery | Autonomy Days | MPPT Controller |
|---|---|---|---|---|---|
| Remote Farm / Ranch PTZ | 15W Day / 28W Night | 1 × 200W (or 2 × 100W) | 12.8V 100Ah (1,280Wh) | 2.5 Days | 20A MPPT |
| Border / Perimeter IR PTZ | 24W Day / 45W Night | 2 × 200W (400W Array) | 12.8V 200Ah (2,560Wh) | 3.0 Days | 30A MPPT |
| Thermal Dual-Spectrum PTZ | 35W Day / 65W Night | 3 × 200W (600W Array) | 25.6V 150Ah (3,840Wh) | 3.0 Days | 40A MPPT |
| Extreme Remote (5–7 Day Autonomy) | 24W Day / 42W Night | 3 × 200W (600W Array) | 25.6V 200Ah (5,120Wh) | 7.0 Days | 40A MPPT |
Frequently Asked Questions
Click any question to expand the answer.
How do you calculate solar panel wattage for a PTZ camera with day/night power variance?
Daily energy consumption (Wh) is calculated as: (Daytime Power × Daytime Hours + Night IR Power × Night Hours) × Duty Factor. Sizing required PV wattage uses: Daily Wh / (Peak Sun Hours × 0.70 System Efficiency Factor). For example, a camera consuming 24W day and 42W night with motion sensing consumes ~553 Wh/day. In a 2.0-hour winter solar zone, minimum PV power required is 553 / (2.0 × 0.70) = 395W (configured as 2 × 200W panels).
What is the maximum standard battery autonomy supported by this sizing tool?
Standard pole-mounted solar surveillance systems support up to 7 consecutive cloudy/rainy days of battery autonomy. Sizing beyond 7 days incurs substantial battery bank weight, requiring specialized ground-mounted enclosures, wind-solar hybrid generators, or custom engineering thermal evaluation.
What solar panel wattages are standard for pole-mounted industrial CCTV?
Standard industrial monocrystalline panels for solar CCTV systems include 100W, 120W, 150W, and 200W (all 18.2V operating voltage). These modular panels can be configured in parallel or series (e.g. 2 × 200W for 400W 12V/24V arrays) to balance wind load resistance on poles with energy output.
How is LiFePO4 battery capacity (Ah) calculated for 1 to 7 autonomy days?
LiFePO4 battery capacity (Ah) = (Daily Energy Wh × Autonomy Days) / (Battery Voltage 12.8V × 0.95 DOD × 0.80 Inverter/Line Efficiency). A 553 Wh/day system requiring 2 autonomy days requires: (553 × 2) / (12.8 × 0.95 × 0.80) = 113.6 Ah, rounding up to a standard 12.8V 150Ah LiFePO4 battery pack.
Does Fengtaida provide customized pre-wired solar power kits with cameras?
Yes. Fengtaida provides turnkey, pre-engineered off-grid solar packages including matching monocrystalline solar arrays (100W/120W/150W/200W), custom-built SUS304 battery enclosures with integrated MPPT controllers, surge arrestors, and pre-terminated industrial cabling tailored to your PTZ camera model and target deployment location.