17kW Grid Tied Photovoltaic System - Photovoltaic - Our Projects

Stier Vente Chartered Accountant Date: 2017

In early 2017 Stier Vente Chartered Accountant did take the decision to move to renewable energy. A 17kW grid feed system was installed on the roof of the office building to reduce the monthly electricity bill.

A total of 67 260W PV modules and a SMA SunnyTripower 17kW inverter was installed. Remote monitoring allows CTS to advise the client on possible faults and recommended actions to be taken.

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Installation of Containerized Off-Grid PV Systems in the Otjozondjupa Region

Ministry of Mines and Energy

2015

Three localities in the Otjozondjupa region where successfully electrified by means of Off-Grid PV containers. The system sizes varied from 6kW, 12kW to 25kW of PV power. PV modules where installed on roofs of nearby houses, batteries, inverter/charger and switchgear are located in our proven design of prefabricated containers to keep the components cool, even in the hottest of climates.

The system is an AC coupled PV system with SMA Sunny Island (SI 8.0) inverter and SunnyBoys of various sizes. Communication between all components is based on a wireless RS485 solution from Phoenix Contact with a distance covered of 1.5km.

Sites that were electrified in the Otjozondjupa region are:

Rooidag Hek
M’Kata
Kukurushe

Installation of 10 Automatic Weather Stations in Botswana

University of Hamburg

2014

CTS was approached by the Botswana Meteorological Department and the University of Hamburg with the request to install automatic weather stations across Botswana. A total of 10 stations were engineered and build at our workshop in Windhoek prior to installation commencement. With our own tower design, the installation time is reduced to nearly 8 hours per tower.

The stations are equipped with sensors from Vaisala, Kipp and Zonen. At the heart of each station is the CR1000 logger from Campbell Scientific. Each station is capable to measure the following:

Wind speed
Wind direction
Humidity
Air Temperature
Irradiance
Barometric pressure
Ground Temperature
Rain
Leaf wetness

In addition to the above parameters the following parameters are calculated by the logger by means of mathematical models.

Dew point temperature
Wet bulb temperature
Sunshine duration

The data from the station is transmitted to ftp servers situated in Gaborone/Botswana as well as Hamburg/Germany on an hourly bases over locally available GSM network providers. Once the data is uploaded to the server in Hamburg, it is processed and posted on a publicly available website. This website collects data of numerous stations across Namibia, Botswana, Zambia, Angola and South Africa for research purposes. A total of 8000km was covered in just under 4 weeks.

Installation of 4 Containerized off-grid PV systems in the Otjozondjupa Region

Ministry of Mines and Energy

2019

Central Technical Supplies was once again awarded the tender to electrify 4 remote localities in the Otjozondjupa Region of Namibia. Custom build containers where installed on site with SMA Sunny Island 8.0 inverter installed. In addition the offered lead acid battery technology has been replaced by state of the art lithium batteries reducing system maintenance. The use of AC coupled technology did allow for the SunnyBoy solar inverter to be in installed inside relevant buildings on which PV modules are mounted. All components are interlinked by means of wireless technology to allow for remote monitoring where GSM signal is of sufficient strength. System sizes vary form 3kW, 12kW, 15kW to 20kW of PV power while inverters are as much as 3 in a single phase cluster.

Sites that were electrified are:

Nhoma
Aasvoel Nes
Kanovlei
Grashoek

Supply and Installation of 3 Automatic Weather Stations in the Kunene Region

University of Hamburg

2017

The University of Hamburg approached CTS directly with the request to quote and subsequently manufacture and install 3 automatic weather stations at:

Khorixas
Kaoko Otavi
Okangwati

Once again, satellite communication has been chosen, this time not because of GSM not being available, but to reduce future cost of the stations as satellite communication for these stations has got no costs associated.

In addition to the basic data measured:

Wind speed
Wind direction
Humidity
Air Temperature
Irradiance
Barometric pressure
Ground Temperature
Rain
Leaf wetness

The stations are equipped with a WLAN interface. This allows the connection of 49″ SmartTV to be connected to each station to display the current weather inside close by offices.

Installation of 26 Autoclaves Country Wide

Ministry of Health and Social Services

2015

CTS was awarded four tenders in 2015, to supply, deliver to site, install, test and commission of autoclaves throughout Namibia.

In addition to the 160L Steri Tech autoclaves, water softeners were installed to increase the life span of each unit and reduce overall maintenance cost.

A number of installation teams worked hard to complete the project within the stringent timeframe set by the client. Each site came with its own challenges such as:

Removing of existing units that were beyond repair
Low supply water pressure
Space limitations where the new units were to be installed
Breaking out of walls to fit new autoclave

17kW Grid Tied Photovoltaic System - Photovoltaic - Our Projects | Central Technical Supplies

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