For larger off grid solar systems, the combination of a high performance solar charge controller and a capable inverter charger can make a major difference to reliability, scalability and overall system control.
One combination used in compatible stand alone power systems is the AERL CoolMax SRX MPPT charge controller paired with the Selectronic SP PRO Series 2i inverter charger.
Both products are designed for demanding off grid applications and are well suited to rural and regional Australian conditions where consistent power and long term serviceability matter.
Power and Precision with the AERL CoolMax SRX
The AERL CoolMax SRX is an Australian designed MPPT solar charge controller built for off grid energy systems in remote and regional applications.
It is designed to maximise solar harvest while giving system designers flexibility around array configuration and charging performance.
Key characteristics include:
- High efficiency MPPT solar charging
- Support for high voltage solar input
- Ability to work with oversized solar arrays where the system is designed appropriately
- Integrated protection and system monitoring features
- Communication options for compatible system integration
Why Oversized Solar Arrays Can Help Off Grid Systems
Off grid systems need enough solar generation to recharge the battery bank after overnight use and periods of poor weather.
Allowing a controller to work with a larger solar array can help increase total daily energy harvest, particularly when available sunshine is limited by cloud cover or shorter seasonal production windows.
The array still needs to be designed within the electrical limits of the controller and the wider system.
Selectronic SP PRO Series 2i
The Selectronic SP PRO Series 2i is an Australian made inverter charger designed for off grid, hybrid and grid assist applications.
It is commonly used in systems where reliability, surge capability and flexible integration are important.
Depending on the model and configuration, the SP PRO can provide:
- Continuous inverter output suitable for larger household and rural loads
- Strong surge capability for equipment such as pumps, compressors and workshop tools
- Support for AC and DC coupled solar configurations
- Generator integration
- Monitoring and system control through compatible Selectronic software
- Scalable configurations where the installation is designed for parallel or three phase operation
Why the SP PRO Works Well for Larger Off Grid Loads
Remote homes, farms and commercial properties can have much higher peak loads than a typical suburban home.
Equipment such as:
- Water pumps
- Refrigeration
- Compressors
- Workshop tools
- Welders
- Large household appliances
can create significant startup demand, so inverter surge capability is an important part of the system design.
Why This Combination Works Well for Off Grid Sites
Pairing the AERL CoolMax SRX with the Selectronic SP PRO can create a flexible off grid platform for suitable rural and regional installations.
- Strong solar harvest High voltage MPPT charging and oversized array capability can help maximise available solar energy
- Flexible system design The equipment can form part of residential, agricultural or larger commercial systems
- Australian support Both brands are well established in the Australian off grid market
- Generator integration Backup generation can be incorporated into the overall charging and power strategy
- System monitoring Compatible communications and monitoring can help track performance and diagnose issues
Where This Setup Can Be Used
- Remote agricultural properties
- Cattle stations and rural homesteads
- Eco tourism properties
- Bush retreats
- Workshops and sheds
- Commercial sites beyond the grid
The exact configuration still needs to be designed around the property’s daily energy use, peak demand, battery storage and available solar generation.
Frequently Asked Questions
Can the AERL CoolMax SRX Work With an Oversized Solar Array?
Yes, where the array is designed within the controller’s current specifications and the wider system requirements.
Can the Selectronic SP PRO Handle Large Equipment?
The SP PRO is designed for demanding off grid applications and provides surge capability suitable for many pumps, compressors and other higher demand loads when the system is sized appropriately.
Are AERL and Selectronic Australian Brands?
Yes. Both companies are established Australian manufacturers with products used in stand alone and renewable energy applications.
Choosing the Right Combination for Your Property
The AERL CoolMax SRX and Selectronic SP PRO can be a strong combination, but the equipment still needs to be matched with the rest of the system.
Important factors include:
- Solar array size
- Battery capacity
- Daily energy consumption
- Peak loads
- Generator backup
- Future expansion
- Monitoring requirements
Talk to Us About Your Off Grid System
At Stand Alone Power Systems, we design off grid solar systems around the complete property rather than selecting individual components in isolation.
If you are considering AERL, Selectronic or other proven off grid equipment, we can help assess the solar array, battery storage, inverter capacity and backup requirements needed for your property.
Get in touch with us to discuss a custom system for your home, farm, workshop or remote site.