Upgrade and Expansion of an Off-Grid PV System - Farm Ombirisu - Photovoltaic - Our Projects

Private Date: 2018

An existing off-grid solar PV system was expanded to a total of 4,44kW on the farm Ombirisu north of Okahandja and the battery was upgraded to a Lithium-ion technology.

Final System Specifications:

6 x 295W Canadian Solar have been added to an existing PV array to deliver a final capacity of 4,44kW
Replacing old charge regulators with 3 x Victron MPPT 150/70
Replace old battery with 1 x BlueNova Lithium-ion battery 24V-24kWh
Pole mounted solar array
Online connection with remote access

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Hybrid photovoltaic system for Gcwatjinga Clinic

Gcwatjinga Clinic

2015

An off gird PV system with generator back up was installed at the Gcwatjinga clinic south east of Rundu. The system comprises of the following components:

6.24 kW PV array
2x Victron BueSolar 150V/70A MPPT regulator
600Ah Battery capacity
Inverter/Charger, Victron Multi, 48V/8000VA
System Monitoring (BMV700, Color Control GX)

The clinic was connected to the grid, which at time of system design and installation the grid connection plans were unknown to the engineer. As the clinic has PV installed, the existing system has been configured such as to allow for grid connection once the batteries reach a predefined SOC. This guarantees a continuous supply of power to the clinic and nurse houses.

In addition to the grid, a backup generator is incorporated in case PV as well as grid failure occur.

Refurbishment of the Van-Eck Transformer Oil Storage Facility

Nampower

2015

CTS was successful in winning the tender for the refurbishment of the transformer oil storage plant at the van Eck Power station. The project included the following:

Cleaning and painting of all oil tanks
Automating the entire plant
Installation of oil filtration system

Old as well as new transformer oil is stored in different tanks. Color codes on the tank clearly indicate what type of oil is stored in each tank. Old oil – oil removed from transformers during service – is stored until enough has been collected before it is sold.

Clean/new oil is stored in the other thanks that will be used for refilling transformers during routine services. Humidity tends to form inside the oil when it is stored for longer periods. This humidity as well as other dirt particles are removed my means of the Alfa Laval Oil Filtration plant. The process is fully automated and PLC controlled. The operator merely is required to enter the quantity of oil that is to be filtered.

Radar level sensors are installed in each tank to monitor quantity on hand. Maintenance free breathers on each tank prevent access of water moisture into the tank and the buildup of dangerous gases.

A Coriolis custody transfer meter accurately indicates the quantity of old oil the is transferred to third party tankers for selling purposes.

A La Mer Laundry - Swakopmund

for A La Mer Laundry

2017

When A La Mer Hotel in Swakopmund decided to expand, they approached CTS with a unique challenge: to create a functional laundry that was both energy and water efficient, and would also fit into a small space, while being whisper quiet, so as not to disturb any guests. In addition, the laundry has to perform excellently, producing quality wash, tumbling and ironing results. Only one brand came to mind: Miele.

Miele recently launched new bench mark machines, which have short program cycles, excellent spin performance, a redesigned patented honeycomb drum and have low consumption values. A La Mer Hotel was the first in Namibia to purchase these new machines.

CTS installed washer extractors with water recovery units, as well as automatic dosing systems, to ensure the best quality wash, every time. The tumble drier has an air recycling system, saving up to 60% of energy. And with a matching drying ironer, optimum finishing results are achieved. Small accessories made this laundry a complete turn key solution.

Supply, Delivery and Installation of a Gas Fired Water Heating System for Hilton Hotel Windhoek

Hilton Hotel Windhoek

2010

CTS was awarded the tender to install a water heating system for the Hilton Hotel Windhoek.

The system was installed according to the following specifications:

• 2x 250kW gas fired hot water boiler

• 2x 6800 liter hot water storage tank (also known as calorifier)

• 1x Danfoss Aqua drive 11kW for glycol circulation pump control

• 2x Automatic bypass valves to control water temperature inside tank

• 4x Hot water circulation pumps

The boilers as well as glycol circulation pumps and one hot water storage tank were installed in the boiler room located in the upper basement of the hotel. The second hot water storage tank is installed on the 9th floor of the Hilton Hotel. A glycol circulation system connects the two calorifier with the two gas fired hot water boilers. The glycol circulation pumps are controlled from one Danfoss Aqua drive with cascading functionality to control the pumping speed depending on the temperature in the glycol line.

Each hot water boiler is cycled on a 24 hour basis, should the glycol temperature fall below a predetermined threshold for certain period of time the second boiler will start automatically.

Automatic bypass valves guarantee that the water temperature of each calorifier is kept at a constant 60 – 65 degrees Celsius.

6kw grid feed photovoltaic system installed in Klein Windhoek

Private

2011

CTS was approached by a senior resident of Klein Windhoek to install a grid-tied photovoltaic system with the aim to cut back on the monthly electricity bill. The system included:

42x 130W photovoltaic modules and mounting structure
1x 6kW grid tied inverter

The system is designed such as to generate an estimated 900kWh per month.

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