Repeater Power and Electricity
Reliable repeater service depends on clean power, correct loads, protection, grounding, backup batteries, charging, ventilation, monitoring, and planned maintenance.
Plan for continuous service
Reliable power requires accurate load information, healthy batteries, correct charging, protection, ventilation, and maintenance.
Current draw
Receivers, transmitters, controllers, fans, network gear, and chargers all contribute to the site load.
Runtime planning
Battery runtime must be estimated from actual load, battery capacity, duty cycle, and battery health.
Surge and grounding
Lightning, utility surges, and wiring faults can damage equipment without proper protection and site practices.
Power path at a repeater site
Utility power, charging, batteries, and site equipment form one power system that must remain stable during normal operation and outages.
Utility power
Normal AC power feeds the site.
Power supply/charger
Equipment power and battery charging are managed.
Battery backup
Batteries support limited runtime during outages.
Radio equipment
Repeater, controller, fans, and network equipment draw from the power system.
Learning notes
Repeaters require more power planning than a desktop radio because transmitters draw high current while controllers, receivers, and network equipment operate continuously.
Backup planning should not be guesswork. The club should track battery age, type, capacity, charger settings, test dates, runtime estimates, and replacement history.
Electrical and grounding work must remain assigned to qualified volunteers or contractors.
CBRA application
Know the load: Record each powered device and its expected current draw.
Test batteries: Battery age and float voltage alone are not enough; capacity matters.
Log outages: Record utility failures, runtime, recovery time, and any abnormal equipment behavior.
Measure load and backup capacity
Document connected equipment, use realistic runtime estimates, and verify protection and grounding records.
List loads
Document every device connected to the power system.
Estimate honestly
Use measured load and battery condition rather than optimistic assumptions.
Check basics
Look for documented surge protection, grounding approach, and safe cable routing.
Reliability starts before the outage
Backup power is useful only when connectors, batteries, chargers, runtime expectations, and safe procedures are understood before they are needed.