When a jobsite network goes down, the first suspect is the internet provider. Often the real cause is power. Generators that cycle on and off, long extension cords that drop voltage, shared circuits that trip, and lightning-driven surges can reset or destroy network equipment. Because trailers and temporary structures are not built with the same electrical infrastructure as permanent buildings, power deserves planning in its own right.
This post covers the basics of keeping jobsite network equipment powered and protected.
Know your power source
Different sites have different supplies.
- Temporary utility power, usually the most stable if properly installed
- Generators, flexible but prone to fluctuations, fuel runouts, and shutdowns
- Solar and battery systems for remote cameras and small devices
- Shared power from other trades or from a temporary panel used by many tools
Find out what powers the trailer, and whether the circuit is shared with heavy loads such as welders, compressors, or heaters. Motors and large tools can cause sudden voltage changes that disturb sensitive electronics.
Give network gear its own circuit
Where possible, connect routers, switches, and access points to a circuit that does not share load with heavy equipment. Ask an electrician to confirm the circuit can handle the load and is properly grounded. Avoid daisy-chaining power strips and extension cords, which can overheat and cause voltage drop.
Use a UPS for critical equipment
An uninterruptible power supply is a battery backup that keeps equipment running during brief outages and conditions voltage. For a jobsite network, a small UPS can make the difference between a brief flicker and a ten-minute reboot cycle.
How to choose:
- Add up the wattage of the router, modem, switch, and access point.
- Pick a UPS rated well above that load.
- Decide how long you want the equipment to run on battery, and check the runtime estimate.
- Choose a model designed for the temperature range where it will operate, since batteries degrade in heat and cold.
- Replace batteries on the manufacturer's schedule.
Do not plug laser printers or space heaters into the same UPS.
Protect against surges
Surges come from lightning, generator switching, and utility events, and they can arrive over power lines, network cables, and antenna cables.
- Use quality surge protectors rated for network equipment
- Protect Ethernet runs that go between buildings or to outdoor devices
- Use lightning arrestors on antenna and satellite cables where recommended by the manufacturer
- Make sure the electrical system is grounded properly, which an electrician should verify
A cheap power strip is not adequate surge protection for expensive equipment.
Plan for generators
If a generator powers the trailer:
- Confirm it has enough capacity for all loads, with some margin
- Use a generator with stable output, since poor quality power can damage electronics
- Set a fueling schedule and assign responsibility
- Know what happens during switchover, and use a UPS to bridge it
- Consider a transfer switch where appropriate, installed by a qualified electrician
Add the generator to your daily site checklist, since an empty tank takes the network with it.
Manage heat and weather
Network equipment in sealed trailers and cabinets can overheat in summer. In winter, some devices struggle in extreme cold.
- Provide ventilation or cooling for enclosures
- Keep equipment off the floor, away from water and dust
- Use weatherproof enclosures for outdoor devices
- Check manufacturer temperature ratings against site conditions
Make recovery easier
Even with good planning, power events happen. Prepare so that recovery is fast.
- Configure equipment to power back on automatically after an outage.
- Save configurations so a replacement can be set up quickly.
- Post a simple startup order sheet near the equipment.
- Keep a spare router or modem on hand for critical sites.
- Monitor remotely so IT knows when a site goes offline.
A hypothetical example
Consider a hypothetical site where the internet drops every afternoon. After weeks of blaming the carrier, a technician finds that the router shares a circuit with a space heater and a microwave. When both run, the voltage dips and the router restarts. Moving the router to a separate circuit with a small UPS ends the problem.
Add power to your site setup checklist
When mobilizing a site, record:
- Power source and capacity
- Circuit assigned to network equipment
- UPS size and installation date
- Surge protection installed
- Generator fuel and checks
- Person responsible
Where Ironfield Cyber helps
Ironfield Cyber helps contractors and energy firms design reliable jobsite networks, including equipment selection, power protection, and remote monitoring. If your sites suffer unexplained outages, we can help identify whether power is part of the problem.