Power and Precision with AERL CoolMax SRX MPPT Controller
The AERL CoolMax SRX is a high-performance, Australian-designed MPPT solar charge controller built specifically for off-grid energy systems in remote and regional Australia. Engineered to maximise solar harvest and uptime, it delivers exceptional efficiency, flexibility, and control.
With a peak efficiency of up to 99%, the CoolMax SRX ensures that nearly all your solar power is transferred into usable battery charge. Supporting input voltages up to 600 V, this controller enables longer PV string lengths—perfect for reducing cable runs and installation costs.
An outstanding feature is its ability to support oversized solar arrays—up to 200% of nominal battery input rating. This is ideal for off-grid solar systems in Queensland, where variable weather can limit generation windows.
Built for tough Australian conditions, the CoolMax SRX includes robust protections such as reverse polarity, thermal shutdown, ground fault detection, and current limiting. It’s also designed with serviceability and diagnostics in mind, featuring a large touchscreen interface and communication via RS485, CAN bus and USB.
Selectronic SP PRO 7.5 kW Series 2i: A Trusted Off-Grid Inverter
The Selectronic SP PRO Series 2i inverter/charger is the gold standard in 48V off-grid solar inverters. Australian-made and time-tested, the SPMC482-AU delivers powerful performance and exceptional flexibility in off-grid, hybrid, and grid-assist configurations.
This unit delivers 7.5 kW of continuous power and up to 13 kW surge capacity, easily supporting equipment like fridges, pumps, welders, and compressors. Its 96% inverter efficiency minimises energy losses and maximises system return.
Perfect for larger setups, the SP PRO supports AC and DC coupling, plus Powerchain parallel configuration—scaling systems up to 240 kW in three-phase mode. Whether you’re installing on a remote cattle station, rural property, or eco-retreat, this unit offers scalability and strength.
The Series 2i also includes compliance with AS/NZS 4777, supports Demand Response Modes 0–8, and provides advanced generator control. Using SP LINK software, you can monitor, log, and optimise performance remotely.
Best of all, when installed by an accredited partner, Selectronic backs this product with a 10-year warranty—a sign of confidence and local support.
Why This System Combination Excels for Off-Grid Sites
Pairing the AERL CoolMax SRX with the Selectronic SP PRO 7.5 kW inverter delivers a robust, scalable solution for off-grid solar systems in regional Australia, especially in areas like the Sunshine Coast Hinterland or Far North Queensland. Here’s why:
- Maximised energy harvest: High voltage input and oversized array support increase total daily kWh production.
- Flexible, modular design: Supports single- and three-phase configurations for residential or commercial use.
- Reliable in harsh climates: Engineered and manufactured in Australia to handle heat, dust, and isolation.
- Full system control: Communication protocols enable centralised load and generation management.
This pairing is an excellent fit for:
- Remote agricultural or pastoral operations
- Off-grid eco-tourism properties
- Homesteads and bush retreats
- Commercial and industrial sites beyond the grid
Search-Optimised Q&A
Q: Is the AERL CoolMax SRX suitable for oversized solar arrays?
A: Yes, it supports arrays up to 200% of its nominal battery rating, perfect for boosting energy capture during limited sun hours.
Q: Can the Selectronic SP PRO 7.5 kW inverter run large equipment?
A: Absolutely. With a 13 kW surge capacity, it handles large inductive loads like pumps and compressors with ease.
Q: Are both units made in Australia?
A: Yes. Both the CoolMax and SP PRO are proudly manufactured in Australia and supported locally.
Final Thoughts: A Smart Choice for Off-Grid Power
If you’re planning an off-grid solar installation in Queensland or looking for a reliable, serviceable system for remote operations, this combination of the AERL CoolMax SRX charge controller and Selectronic SP PRO inverter stands out. Backed by local expertise, world-class engineering, and proven performance, this duo is built to deliver.
Need help designing or sourcing the right components? Contact us for system design support, component supply, and technical advice tailored to Australian conditions.