Telecom and mobile phone networks are a vast potential market for off-grid PV systems. System sizes range from a few hundred W to several kW.
The load is constant/predictable, which is ideal for an off-grid solar electric system. The diesel generator is mainly for emergency situations, if there is a problem with the PV system.
DC power is required for the retransmitting equipment, and AC power may also be required for ancillaries such as cooling fans or lighting.
Typical off-grid solar-powered telecom system.
Daytime operation: Power is provided by the PV array, and the batteries are charged.
Night-time operation: Power is provided from the batteries.
Back-up operation: The generator automatically comes on if required.
Telecom systems operators will normally prioritise the security of the power supply over up-front costs. Telecom PV systems are very reliable, and require very little maintenance.
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