Week 13 progress update - Nukunonu Atoll (Tokelau)
By Shane Robinson
Image: Nukunonu solar array
In 4 short weeks the installation is 95% complete. All of the solar modules, inverters, and batteries are in place and the bulk of the wiring and termination is complete. The system should be commissioned and turned on in one weeks time. If we meet our goal, the system on Nukunonu will have been completed ahead of schedule. We are currently planning on departing for Atafu as soon as the system is commissioned and training is complete. The next boat is scheduled to depart Apia on the 18th of September giving us ample time to complete with hopefully some spare time to focus on fishing, snorkling, and family time.
The system on Nukunonu is much closer to the sea compared to the first system on Fakaofo. At the location of the array the island is only 100 metres wide. The array itself is 50 metres wide leaving only 25m on each side of the array to the sea. The choice of components and the design of the system has taken this aspect into account. All of the aluminum frames have been cut and drilled before being anodised to 30 microns (marine grade). All of the fasteners are 316 stainless steel and have been coated in lanolin spray during the installation. The solar panels are tested to IEC61701 - Salt mist certification.
The system here is composed of:
- 1152 x 230W solar modules for a total of 265 kW
- 384 x Lead acid batteries for a total of 1840 kWh of storage (80% depth of discharge)
- 24 x Sunny Island 5048 5 kW inverters for a total of 120 kW of peak capacity
|Front view of the Nukunonu solar array|