Growatt Nexa Dual Fan Adapter

Growatt Nexa Cooler

This precisely fitting Dual Fan Adapter was specially developed for the Growatt Nexa storage unit.

Background: Under high load (e.g., during maximum PV charging in summer or heavy discharge), my storage unit reached temperatures of up to 55 °C. To protect the sensitive internal components and cells and to significantly extend the lifespan of the storage unit, an active cooling solution was needed. Since I searched in vain on all known platforms (like Thingiverse, Printables, or MakerWorld) and couldn't find a single suitable adapter for the Nexa storage unit, I developed this solution myself.

The Special Feature: The adapter requires no modifications or screws on the storage unit itself. It is simply precisely placed from above onto the original aluminum cooling fins of the Growatt Nexa – no tools, no gluing, and absolutely non-destructive!

Remix Information / Credits

This model is a remix of the great design "Bottom Fan Spacer for PC Case (Dual 120mm) available here, by CraftCruz. 

Features

• Perfect Fit: Specially adapted to the profile of the Growatt Nexa's cooling fins.
• Effective Dual Cooling: Designed for two 120mm fans to direct a powerful, even airflow directly through the cooling fins.
• Flexible Mounting System: Integrated receptacles for clean use of M4 press-fit nuts or, alternatively, traditionally with M3 screws, washers, and nuts.
• Maintenance-Friendly: The adapter can be removed in seconds for cleaning or dusting the cooling fins at any time.

Required Material / Hardware

• 2x 120mm Fans (Important: The adapter is designed precisely for this size!)
• Power Supply (Tip): These fans are available directly with a USB connection. This allows them to be operated very flexibly and autonomously – for example, via a simple power bank or a small USB solar panel. Alternatively, a classic 12V or 5V power supply also works.
• 2x Fan Grills (optional, protects cables and fingers from the fan blades)

For attaching the fans to the adapter (two options):

• Option 1 (Recommended):
  • 8x M4 Press-Fit Nuts / Heat-Set Inserts (are melted into the adapter with a soldering iron)
  • 8x M4 Screws (length suitable for the thickness of your fans)
• Option 2 (Alternative):
  • 8x M3 Screws (length suitable for the thickness of your fans)
  • 8x M3 Washers & Nuts

Print Recommendations

Since the adapter sits directly on the hot cooling fins of the storage unit, you should choose the right material for printing:

• Material: PETG, ASA, or ABS are strongly recommended. Please do not use standard PLA, as it could soften and deform due to the heat generated by the storage unit.