The size of solar controller you need will depend on the nominal voltage of your system, the number of panels you plan to install, and whether you plan to "Overdrive" your solar controller (more information here). The tables below list the maximum recommended solar array size and overdrive array size for each model of MPPT Solar Controller at 12V and 24V.
| EN43510 | EN43520 | EN43530 | EN43540 | |
|
Max Recommended Array Size (12V) |
150W | 300W | 450W | 600W |
| Max Recommended Overdrive Array Size (12V) | 180W | 360W | 540W | 720W |
| Max Recommended Array Size (24V) | 300W | 600W | 900W | 1200W |
| Max Recommended Overdrive Array Size (24V) | 360W | 720W | 1080W | 1440W |
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