2015: A year of solar power, battery technology advances.

2015: A year of solar power, battery technology advances.

By Bevan Jones, Technical Director at Soltra Energy

The past year witnessed a sharp uptick in interest in South Africa for rooftop solar photovoltaic (PV) power for a wide range of domestic, commercial and industrial applications. This was bolstered by an increasing determination on the part of consumers to reduce their reliance on Eskom.

Solar power – nature’s free alternative – is now seen as a cost-effective, ‘green’ solution, particularly when compared to noisy diesel- or petrol-powered generators.

Perhaps one of SA’s more memorable advances in the power provisioning field in 2015 was the development by Soltra Energy of a new installation paradigm for solar PV panels.

Soltra Energy is a leader in the field of solar PV power provisioning systems and infrastructures. Its innovative solution is set to provide businesses with more effective energy returns from rooftop solar PV solutions while boosting the often limited availability of Eskom power.

Conventional wisdom maintains solar PV panels should be orientated towards north in the southern hemisphere to allow for the most efficient power generation. The result, from a power production standpoint, is a ‘bell curve’ reflecting power increases throughout the day peaking at midday and gradually falling again to zero at sunset.

However, in a pioneering grid-linked hybrid solar PV application in Johannesburg, an east-west orientation was proposed by Soltra Energy, tested and found to be more advantageous in a business environment.

The motivation for the experiment was an Eskom electrical power supply unable to meet the business’ full demand. A complementary challenge was to reduce the aggregate electricity cost for the facility.

Soltra Energy initially evaluated power production from traditionally north-facing panels. Subsequently, various directions were tried culminating in a convention-breaking, east-west configuration which, in this application, provided significant cost advantages over a north facing system.

One of the keys to the success of the installation – and similar installations going forward - lies with its management. Sophisticated ‘smart’ power management solutions designed by Soltra Energy can now be installed and tailored to users’ needs.

These systems will, for example, complement grid power with solar power when necessary (at peak times), divert excess solar power to possible battery storage for later or after-hours use as appropriate, and engage an optional generator to integrate seamlessly into the power supply grid should battery storage become depleted.

Another breakthrough in this field in 2015 was the launch of a locally-designed ‘power wall’ lithium-ion battery pack solution and making it available to the local market ahead of a similar unit produced by US manufacturer Tesla.

Like its American counterpart, the SA-manufactured Soltra Energy Wall is designed to store excess energy, whether it is derived from the Eskom grid, from solar panels or a combination of both as found in increasingly common hybrid systems.

The attractive, space-saving unit represents a leap forward in battery storage and is expected to boost the acceptance of rooftop solar PV-plus-battery solutions in 2016 and beyond, giving SA consumers greater control over their energy usage.

Efficient battery storage could quickly become one of the biggest game-changers in the South African energy landscape, which will continue to be characterised by a mismatch between demand and supply. It’s a technology whose time has finally arrived.

Find us:

www.soltra.co.za

The Tesla Powerwall: We couldn’t wait, so we designed our own.

The Tesla Powerwall: We couldn’t wait, so we designed our own.

By Jack Ward, CEO of Soltra Energy

From what we’ve seen in the media, the Tesla Powerwall lithium-ion battery pack is an attractive, wall-mounted, space-saving unit that represents a leap forward in battery storage technology.

For users opting for solar energy installations, either to complement or backup Eskom power – or move off the grid completely - the Powerwall concept will certainly boost the acceptance of rooftop solar PV-plus-battery solutions beyond all projections. It’s a technology whose time has finally arrived.

While the Tesla Powerwall has been eagerly anticipated by South Africans facing disruptive power outages and the real possibility of load-shedding in the near future, the first Tesla units for general distribution in SA are reportedly some months away.

Fortunately for local electricity consumers, there is no need to wait. The alternative to the Tesla Powerwall is already on the market. Thanks to local design innovation and manufacturing excellence, the Soltra Energy Wall is available for immediate delivery. There is no waiting for a supply channel to be formed, personnel to be hired or stock to arrive.

One of the most attractive features of the Soltra Energy Wall – which assuredly mirrors its opposition in terms of specification and presentation – is the price. As can be expected, SA’s falling rand against the US dollar has caused the retail prices of US-made goods to soar. According to reports, final pricing for the Tesla Powerwall will likely only become available closer to the battery’s local launch date.

On the other hand, the SA-designed and manufactured Soltra Energy Wall – now available for country-wide installation - is cost effective and its price is easily justifiable for a wide range of applications. These range from domestic installations to the largest industrial sites where synchronised, multiple wall-mounted units and a unique, utility-scale, floor-standing version of the Soltra Energy Wall are ready for duty.

Most importantly, the Soltra Energy Wall is backed by a world-standard 10-year guarantee (subject to a 70% depth of discharge benchmark) and nationwide technical service by an existing, highly-trained and experienced customer support team.

While the Tesla Powerwall has been hailed as a game-changer, we can confirm that the locally-designed Soltra Energy Wall has already irreversibly altered the rules by which the power provisioning game is played in South Africa.

Find us:

www.soltra.co.za