12:00 · 2.32 kW from the array
Battery 100 %
Load · 400 W
24 hours · array output, load, battery charge
57.7 °C inside · 35 °C outside
Heat exchanger · 136 W
Drop 0.60 m · stops within 54 mm
Isolators · fn 10.1 Hz
Vehicle floor · input vibration
Sensor · 6.6 W at the device
Camera · 26.4 W at the device
Access point · 52.8 W at the device
PTZ camera · 75.0 W at the device
PoE switch · 24 ports
227 N · at 15 m
3.40 kN·m · added at the base
Wind profile · 29.5 m/s at 3 m, 40.3 m/s at 27 m
Alternator · 60 A at 14 V
Load · 120 W
Battery 26 % · 12:00, parked
LFP battery and inverter
Intro.
Hardware & power · Explainer
Six engineering checks behind every field installation, each worked live: the solar and battery balance through a day and a night, the heat an enclosure can shed, the isolation that protects a transit rack, the Power over Ethernet budget, the wind on a mounted antenna and the power a crew truck carries. Every number below is computed live from your inputs.
01 · Microgrid energy balance
Daily irradiation outside the atmosphere follows from latitude and date: H₀ = (24 · 3600 · Gsc / π)(1 + 0.033 cos(360n/365))(cos φ cos δ sin ωs + ωs sin φ sin δ), with sunset hour angle ωs = arccos(−tan φ tan δ). The clearness index takes it to the ground, and the array delivers its rated kilowatts times that irradiation times a performance ratio of 0.8, shaped hour by hour by the Sun’s height. The battery carries the load through the dark on 90 % of its capacity.
Date
Sky
02 · Enclosure thermal
A free-standing painted steel enclosure loses heat through every face but its base, A = WD + 2H(W + D), at about 5.5 W/m²K, so the inside runs ΔT = P / (5.5 A) above ambient. A sealed IP66 / NEMA 4X box that runs too hot needs a closed-loop exchanger or air conditioner for the difference, P − 5.5 A (Tmax − Tamb). A filtered-fan IP54 box moves V = 3.1 (P − 5.5 A ΔT) / ΔT m³/h of outside air, and no fan can cool below ambient. Equipment here is held at 50 °C or less.
Enclosure, W × H × D
Protection
03 · Rugged rack isolation
The inner rack frame rides on eight elastomer isolators, a mass on a spring with natural frequency fn = (1/2π)√(k/m). Above √2 times fn the isolators cut vibration: transmissibility is √((1 + (2ζr)²) / ((1 − r²)² + (2ζr)²)) with r = f / fn and damping ζ = 0.1. In a drop the frame meets the case at v = √(2gh); the isolators stop it within v / ωn at a peak of v ωn / g. Softer isolators protect better and need more room to move.
04 · Power over Ethernet budget
A PoE switch reserves each port’s class power from its supply: 7 W for a class 2 sensor, 30 W for a class 4 camera, 60 W for a class 6 access point and 90 W for a class 8 pan-tilt camera with a heater. The cable burns I²R on the way: at 44 V and 20 Ω for 802.3af, 50 V and 12.5 Ω for 802.3at, and two pair-sets in parallel at 50 or 52 V for 802.3bt, scaled by length from 100 m. Ports are powered in order until the supply is spent; the rest stay dark.
Switch PoE supply
05 · Mounting and wind load
Wind speed rises with height by the power law v(h) = v₁₀ (h / 10)1/7 over open ground. The dynamic pressure is q = ½ρv² with ρ = 1.225 kg/m³, and the drag on the equipment is F = q Cd A, with Cd about 1.2 for a flat panel facing the wind and 1.4 for a solid dish without a radome or a sector antenna face-on. The force acts at the mount, so the bending moment it adds at the tower base is F · h.
Equipment
06 · Mobile power
A DC-DC charger draws the alternator’s spare current at 14 V into a lithium iron phosphate battery at 95 % efficiency; an inverter at 90 % efficiency runs the load around the clock. Charging power is 14 I × 0.95, the battery runs the load for 0.9 E η / P hours, and the day balances when the hours of driving put back what the load takes. The scene plays one day in 24 seconds, driving first.
Six engineering checks behind every field installation, each worked live: the solar and battery balance through a day and a night, the heat an enclosure can shed, the isolation that protects a transit rack, the Power over Ethernet budget, the wind on a mounted antenna and the power a crew truck carries. Every number below is computed live from your inputs.
Daily irradiation outside the atmosphere follows from latitude and date: H₀ = (24 · 3600 · Gsc / π)(1 + 0.033 cos(360n/365))(cos φ cos δ sin ωs + ωs sin φ sin δ), with sunset hour angle ωs = arccos(−tan φ tan δ). The clearness index takes it to the ground, and the array delivers its rated kilowatts times that irradiation times a performance ratio of 0.8, shaped hour by hour by the Sun’s height. The battery carries the load through the dark on 90 % of its capacity.
A free-standing painted steel enclosure loses heat through every face but its base, A = WD + 2H(W + D), at about 5.5 W/m²K, so the inside runs ΔT = P / (5.5 A) above ambient. A sealed IP66 / NEMA 4X box that runs too hot needs a closed-loop exchanger or air conditioner for the difference, P − 5.5 A (Tmax − Tamb). A filtered-fan IP54 box moves V = 3.1 (P − 5.5 A ΔT) / ΔT m³/h of outside air, and no fan can cool below ambient. Equipment here is held at 50 °C or less.
The inner rack frame rides on eight elastomer isolators, a mass on a spring with natural frequency fn = (1/2π)√(k/m). Above √2 times fn the isolators cut vibration: transmissibility is √((1 + (2ζr)²) / ((1 − r²)² + (2ζr)²)) with r = f / fn and damping ζ = 0.1. In a drop the frame meets the case at v = √(2gh); the isolators stop it within v / ωn at a peak of v ωn / g. Softer isolators protect better and need more room to move.
A PoE switch reserves each port’s class power from its supply: 7 W for a class 2 sensor, 30 W for a class 4 camera, 60 W for a class 6 access point and 90 W for a class 8 pan-tilt camera with a heater. The cable burns I²R on the way: at 44 V and 20 Ω for 802.3af, 50 V and 12.5 Ω for 802.3at, and two pair-sets in parallel at 50 or 52 V for 802.3bt, scaled by length from 100 m. Ports are powered in order until the supply is spent; the rest stay dark.
Wind speed rises with height by the power law v(h) = v₁₀ (h / 10)1/7 over open ground. The dynamic pressure is q = ½ρv² with ρ = 1.225 kg/m³, and the drag on the equipment is F = q Cd A, with Cd about 1.2 for a flat panel facing the wind and 1.4 for a solid dish without a radome or a sector antenna face-on. The force acts at the mount, so the bending moment it adds at the tower base is F · h.
A DC-DC charger draws the alternator’s spare current at 14 V into a lithium iron phosphate battery at 95 % efficiency; an inverter at 90 % efficiency runs the load around the clock. Charging power is 14 I × 0.95, the battery runs the load for 0.9 E η / P hours, and the day balances when the hours of driving put back what the load takes. The scene plays one day in 24 seconds, driving first.
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