Solar GPS Tracker
An asset tracking device powered by a solar panel and internal battery, designed for non-powered assets like trailers or equipment that lack a consistent power source.
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Compare Telematics software →How Solar GPS Trackers Sustain Power Indefinitely
A solar GPS tracker combines a photovoltaic panel (typically 0.5W–3W) with a rechargeable lithium battery pack (5,000–20,000 mAh). The solar panel continuously tops up the battery whenever ambient light is available — direct sunlight, diffuse overcast light, or even bright indoor fluorescent lighting in some high-efficiency designs. The battery serves as a buffer for night, covered storage, and extended cloudy periods. A well-designed solar tracker can sustain indefinite operation at 4 hourly GPS reports per day with as little as 2–3 hours of direct sunlight daily. In regions with fewer than 3 sun-hours per day — Pacific Northwest, UK, northern Canada in winter — operators should verify the panel's output against the device's consumption specification to avoid battery depletion over multi-week cloudy stretches.
Panel Size, Output, and What the Numbers Mean
Solar panel specifications on tracker datasheets can be misleading. A 1W panel produces 1 watt under Standard Test Conditions (STC): 1,000 W/m² irradiance, 25°C cell temperature. Real-world outdoor conditions rarely match STC. A practical rule of thumb is to derate panel output by 70–75% for real-world performance. A 1W panel in practice delivers approximately 0.7–0.75W under good conditions. A device drawing 50mA at 3.7V (0.185W) when actively transmitting and 5–10mA in sleep mode will fully recharge from a 1W solar panel in 20–30 minutes of direct sun — meaning even a few hours of sunlight per day easily sustains the device at 1-hour reporting intervals.
Mounting Considerations for Trailers
The most common solar tracker deployment is on the roof or rear door frame of a dry van or flatbed trailer. Roof mounting maximizes sun exposure but requires someone to climb the trailer for installation. Rear door or side rail mounting is more accessible and still captures adequate light. Magnetic mounting works on steel trailer roofs but must be rated for highway speeds — a magnet rated for 150 lb static pull can experience significantly higher forces at 65 mph with wind loading. For permanent deployments, bolt-through mounting with a weatherproof gasket is more reliable. Connector cables must be UV-resistant and secured against road vibration.
Real-World Example: Seasonal Agricultural Equipment
A grain farming operation in Kansas tracked 8 grain carts, 3 header trailers, and 4 augers — equipment that sits idle for 8–10 months of the year between harvests. Battery-only trackers required a technician to physically visit each piece of equipment twice a year for battery replacement or recharging. After switching to solar-powered trackers, the operation eliminated all battery maintenance visits. Over a 3-year period, the solar trackers remained operational through Kansas winters with 4–5 hours of winter sun per day, maintaining 12-hour reporting intervals and monthly location checks without any intervention. Total labor savings on battery maintenance: approximately 60 technician-hours over 3 years.
- Calculate average daily sun hours for your operating region before specifying panel size
- Verify the device shows live battery percentage, not just a low-battery alert
- Check IP rating — outdoor trackers should be IP67 or higher for rain and dust resistance
- Confirm the mounting hardware is rated for highway speed vibration if used on trailers
- Ask whether the solar panel is integrated or external — external panels allow better positioning
- Verify the device has an internal backup battery sufficient for 7+ days without sunlight
- Check operating temperature range — agricultural equipment in the Midwest sees -30°C to +55°C