Solar and Battery Runtime on a Mobile Security Trailer — The Real Numbers
A modern monitored security trailer runs indefinitely on solar under normal Houston conditions and holds 4–7 days of full runtime on battery alone during overcast weather. The specs — solar array wattage, battery capacity, load profile, and generator backup — determine whether the trailer stays armed through a hurricane week or drops offline in day 3 of overcast.
The load profile
A monitored trailer's daily load: 4 PTZ cameras at 8W each (32W), NVR + edge processor (~45W), cellular modem + failover (~15W), talkdown amplifier idle (~5W, spikes to 60W during broadcast), interior + perimeter lighting (LED, ~20W).
Total baseline: ~120W continuous or ~2.9 kWh/day.
- Cameras (4 PTZ): 32W
- NVR + edge AI: 45W
- Cellular: 15W
- Talkdown idle: 5W (spikes 60W)
- Lighting: 20W
- Total: ~120W / 2.9 kWh per day
The solar and battery spec
Guardtress trailers ship with ~1,200W solar array (four 300W panels on the fold-out array) and ~15 kWh lithium battery bank.
Under Houston average conditions (5.2 peak sun hours/day), solar produces ~6.2 kWh/day — more than 2x load. Battery bank alone runs the trailer for ~5 days at full load with zero solar input.
What overcast weeks actually look like
A stretch of 5+ overcast days is rare in Houston but happens 2–3 times per year. Solar production drops to ~20–30% of nameplate, or roughly 1.2–1.8 kWh/day — below load.
Battery covers the shortfall for the first 4–7 days depending on charge state entering the overcast window. Beyond that, the on-board fuel generator (48-hour tank) activates automatically.
- Overcast week solar output: ~20–30% nameplate
- Battery-only runtime: 4–7 days
- Generator backup: 48 hr per tank
- Refuel logistics: automated for extended deployments
The specs that actually matter when you spec a trailer
Ask any prospective vendor for: (1) solar array nameplate wattage, (2) battery bank capacity in kWh, (3) load profile in W continuous, (4) battery-only runtime, (5) generator backup runtime, (6) automated refuel logistics.
Anything vague is a red flag. Reputable vendors publish these numbers.
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