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AERL EarthGuard Ground Fault Detection – EG-300



Utilizing proprietary detection techniques, the AERL EarthGuard Insulation Monitoring Device simultaneously monitors the unearthed PV Array (60 – 300V) and Battery Storage System (48/120V) for conductor insulation degradation.

Installed on the battery bus, the EarthGuard monitoring device satisfies the earth fault detection requirements of both AS/NZS 5033:2014 & AS/NZS 5139:2019 with onboard audio/visual alarms and an alarm relay output for external fault indication.

Featuring support for full integration with AERL’s CoolMax SRX charge controller range, EarthGuard can be utilized in an integrated arrangement or as a standalone device for use with approved third-party controllers, power conversion equipment
and battery systems.

Do I Need an EarthGuard?


– 60 – 300V PV Monitoring Range
– Supports 48V & 120V Batteries
– One EarthGuard Per System (When used with AERL CoolMax SRX regulators)
– High Accuracy Detection
– Audio & Visual Alarms
– Alarm Indication Relay

Spec sheet:


Warranty Guide:


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