# MT81 Generator Sizing

The MT81 Security Trailer includes a 1,600 W solar array designed to maintain battery health and system uptime under optimal solar conditions.

If a deployment location does not provide sufficient solar exposure to sustain operation, Verkada recommends connecting AC shore power to ensure continued system availability.

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Use the 120 V AC / 15 A port on the rear of the unit to connect an external power source. See the [installation guide](https://docs.verkada.com/docs/mt81-security-trailer-install-guide.pdf) for more information.
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## Generator sizing considerations for MT81 charging

The MT81 AC charger is designed to draw close to the maximum output of a standard 120 V, 15 A circuit, which equates to approximately 1,600–1,700 W of continuous load.

#### Limitations of 1–2 kW generators

Many generators marketed as 2,000 W only deliver \~1,600 W of continuous power, with the higher rating referring to peak or surge output. Operating a generator at or near its continuous limit for extended periods can result in the following issues:

* **Circuit breaker or fuse trips:** Causes intermittent or interrupted charging.
* **Power instability:** Voltage and frequency fluctuations can occur when the generator is under sustained load.
* **Charger protection resets:** The MT81 charger may shut down to protect itself from unstable or “dirty” power.
* **Environmental derating:** Generator output may be reduced in high-temperature or high-altitude environments.

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These issues commonly occur with 1–2 kW generators powering high-draw charging systems.
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#### Benefits of a 3 kW generator

Using a 3,000 W (3 kW) class generator allows the MT81 charger to operate at approximately 60–70% of the generator’s rated capacity, providing sufficient power headroom for stable operation. This helps ensure:

* **Stable power delivery:** Consistent voltage and frequency during charging.
* **Improved reliability:** Reduced risk of nuisance breaker trips or charger shutdowns.
* **Environmental resilience:** More reliable operation in high temperatures, dusty environments, or at higher elevations.
* **Improved generator longevity:** Reduced strain on the generator during extended use.

#### Deployment consistency and support impact

Generator performance and power quality can vary significantly by manufacturer and price tier. Recommending a 3 kW class generator helps ensure:

* Consistent performance across a wide range of deployments
* Reduced troubleshooting during setup and operation
* Fewer support cases related to power instability
* A more reliable customer experience, including when using entry-level generator models