DITCH THE GRID

The topic of "sustainable", "off-grid", or "green" homes has become increasingly prominent of late, due not only to the cost-of-living crisis but the unreliable nature of state structures... outlining the effectiveness of an energy (and water) efficient property.
 

As increasing energy bills and water cuts continue to ravage homeowners, interest is rising in cutting costs as well as accessing stable utilities. Last month saw a record number of solar installations across the country.
 

Good advice is key, especially for those looking to retrofit their properties. While other countries such as the UK are encouraging people to get off-grid, solar power users stand the possibility of surcharges from Eskom to continue to fund the energy company. 

THE CURRENT CRISIS 

South Africans have suffered load-shedding since late 2007, and the country's water infrastructure is now also threatened due to ageing and poorly maintained infrastructure.

Those wishing to go completely off-grid can expect to pay R734,195 to R795,525 to ditch Eskom and municipal water altogether.

However, a system with very little reliance on Eskom and zero dependence on municipal water is more cost-effective, costing around R354,985 to R416,315.

President Cyril Ramaphosa has implemented several steps to end load-shedding and save Eskom, but it could still be a while before South Africans see any change to the country's power grid. Not only that, but BusinessTech and the Sunday Times reported last week that there is a water crisis looming in South Africa, due to water infrastructure that is more than 30 years old and failing.

"South Africa's water infrastructure is going in the same direction as Eskom's power plants due to a lack of necessary maintenance."
- Professor Anja du Plessis
 

MyBroadband determined the cost of an entirely off-grid solar system with batteries, drilling a borehole, and installing a filtration system:

 

WAVING GOODBYE TO MUNICIPAL WATER

South Africans looking to go completely off-grid and ditch municipal water in addition to Eskom have several factors to consider before taking the plunge and drilling a borehole.

• The depth of groundwater varies across the country, with the Borehole Water Association of South Africa (BWA) saying that it could be anywhere between 30 and 150 meters deep.

• Drilling costs average around R600 per meter.

• According to SA Borehole, the average drilling depth to reach groundwater in South Africa is around 300 feet or 90 meters, meaning drilling alone could cost around R54,000.

• The borehole then has to be cased to prevent excess debris in the water from pumping to the service. BWA recommends uPVC as the casing material.

• At a price of between R360 and R992 per meter, depending on the outer diameter needed, casings can be another R32,400 to R89,280.

• The next aspects to consider are the water pump and laboratory testing of the groundwater to determine which filters are needed before you can use it.

• Pumps vary in price depending on their power ratings, and the unit you need will depend on the depth of your borehole. A 1.25kW 230V submersible borehole kit is available for R12,495 from Adendorff.

• Laboratory testing will set you back between R2,000 and R5,000. The test results will determine what kind of filtration system you require. For water to be safe for human consumption, it must be clear of dangerous bacteria, parasites, and viruses that aren't visible to the naked eye.

• Pricing starts at R12,500 for an indoor filtration system and R13,950 for an outdoor installation, but some filters (such as KDF and nano carbon filters) can significantly increase the installation costs.

• Lastly, you would also need to consider a storage container for your groundwater. Prices vary depending on the size of the tank required. While some households could make do with a 1,000-litre JoJo tank, they may want to increase the capacity for periods of higher water use or if they intend to water their garden. A 2,400-litre JoJo tank costs around R2,800.
  
   

EISH... Escaping Eskom

"South Africans wishing to go completely off-grid with a solar panel and battery setup need to oversize their system significantly to compensate for times when solar electricity generation fluctuates. South Africans would need to triple or even quadruple their requirements to compensate for such fluctuations."
- AWPower's Christiaan Hattingh
 

• An earlier MyBroadband analysis revealed that an average home would pay roughly R618,000 to install an entirely off-grid solar system.

• However, grid-tied systems with a slight reliance on Eskom's grid - around 98% solar generation and 2% grid power - are significantly cheaper, with a 900kWh-capable system coming in at about R240,000.

• The amount of power used at night is also essential to consider as it will determine your battery storage requirements to keep the lights on at night. The average South African household uses around 60% of its electricity during the evenings, meaning battery storage of at least 18kWh would be required for homes using 900kWh a month.

• It is important to consider the peak power that a single-phase Eskom connection provides to households, which reaches up to 13kW, making it possible to run power-hungry appliances, including electric stoves, kettles, and geysers.

• Cost-effective hybrid inverters are typically rated for 8kW, meaning converting specific appliances to gas may be necessary. 

• It is also possible to get a 200-litre solar-powered geyser for around R27,000.
  
   

TOTAL COSTS

A grid-tied system suitable for a household that uses 900kWh a month with little reliance on Eskom costs about R238,790, while an entirely off-grid system that meets the same requirements is around R618,000.

 

1. When combined with the R116,195 to R177,595 needed to install a borehole system for a household using around 950 litres a day, South Africans can expect to pay approximately R354,985 to R416,325 in total for a grid-tied setup with very reliance on Eskom.

2. An entirely off-grid system with zero reliance on Eskom costs significantly more at about R734,195 - R795,525.

The table below summarises the cost of a completely off-grid solar and water system with the above specifications. Note that this doesn't account for gas installation for geysers or stoves, which is certainly a viable option. 
 

LWP Properties has a variety of homes for sale, including ones that are already grid independent! Please contact us if you are curious about what your options are...