Reliable Backup Generators for Off-Grid Power Systems

A correctly integrated backup generator keeps an off-grid power system operating through extended poor weather, higher-than-expected loads and periods of reduced solar generation.

MyEnergy designs complete off-grid systems with automatic generator backup, giving homes, farms and remote operations reliable power throughout the year.

Why Off-Grid Systems Need Generator Backup

Solar and battery storage will normally supply most of an off-grid property’s energy. However, every system must also be designed for periods when solar production is low or power consumption is unusually high.

A backup generator provides another source of energy when the battery reaches a programmed level. This protects the battery from excessive discharge and keeps essential loads operating without requiring someone to manually start the generator.

Automatic Generator Starting

MyEnergy can configure the off-grid inverter system to automatically control a compatible generator.

The generator can be programmed to start based on:

Battery state of charge
Battery voltage
High site loads
Time-of-day conditions
Inverter overload or power demand
Scheduled battery charging

Once started, the system allows the generator to warm up before accepting load. It can then power the property while recharging the battery bank. After the required battery level is reached, the generator completes its cooldown period and shuts down automatically.

Manual controls remain available when the generator is needed for servicing, testing or additional site power.

Correct Generator Sizing Matters

An undersized generator may struggle to supply the property and charge the batteries at the same time. An oversized generator can spend long periods running under light load, increasing fuel consumption and creating potential maintenance issues.

We size the generator around:

Inverter and battery-charger capacity
Normal and peak site loads
Motor and pump starting requirements
Battery charging limits
Generator operating range
Available fuel and local servicing
Expected generator run time

The result is a generator that works properly with the wider off-grid power system rather than being treated as a separate piece of equipment.

Generator and Inverter Integration

Successful generator backup depends on more than connecting an AC supply to the inverter.

MyEnergy configures the inverter, battery and generator controls so the complete system operates together. This can include:

Two-wire automatic start and stop control
Generator input-current limits
Battery charging limits
Warm-up and cooldown timing
Voltage and frequency acceptance settings
Load management
Generator fault monitoring
Remote alerts and system monitoring

Where required, non-essential loads can be temporarily limited while the generator is charging the batteries or supplying higher-priority equipment.

Choosing a Generator for an Off-Grid System

Diesel generators are commonly used for remote and higher-demand off-grid systems because they are suited to longer operating periods and can be supplied in low-speed, liquid-cooled configurations.

The right generator will depend on the application. A remote home with occasional backup requirements has very different needs from a dairy, pumping site, workshop or commercial facility.

We consider the generator’s operating duty, fuel storage, noise, weather protection, starting capacity and access to local parts and servicing before recommending a suitable option.

Built for Remote Reliability

MyEnergy has been designing and installing off-grid power systems since 2010. Our team handles the solar, battery, inverter, generator controls and system commissioning as one complete project.

This provides clear responsibility for how the equipment is selected, programmed and supported throughout the life of the system.

Off-Grid Generator FAQs

Does every off-grid solar system need a generator?

For most permanent off-grid homes and commercial sites, generator backup is strongly recommended. It protects the battery and provides power during extended poor weather, unexpected consumption or equipment maintenance.

Can an off-grid generator start automatically?

Yes. A compatible generator can be started and stopped automatically by the inverter system using two-wire control. The starting conditions are programmed around battery level, site loads and operating requirements.

What size generator is required for an off-grid system?

Generator size depends on the inverter capacity, battery charging rate, peak loads and motor-starting requirements. It should be calculated as part of the complete system design rather than selected only from the property’s average consumption.

Can an existing generator be connected?

Sometimes. The generator must have suitable voltage and frequency performance, enough capacity and compatible starting controls. MyEnergy can assess an existing unit before including it in the system design.

How often will the generator run?

Run time depends on the available solar, battery capacity, seasonal weather and site consumption. A well-sized system should primarily use solar and battery power, with the generator operating when additional backup is genuinely required.