Updated the article with comments from Soltra Energy CEO Jack Ward. The full e-mail interview is reproduced below.
Do you think the Tesla Powerwall is as revolutionary as many people think it is?
Yes, the Tesla Powerwall is a revolutionary concept. Not necessarily because the battery system is based on lithium-ion (Li-ion) technology – which has been around for many years powering cell-phones, lap-top computers and now electric cars – but because Tesla will bring it to the mass market fully packaged at a very competitive price point it will no longer be an exotic option. It is the first solution that makes it possible for the wide-spread use of alternative energy sources such as solar PV. The battery’s competitive pricing will make it generally available to many more consumers than current, competing battery technologies.
Do you think this technology will come to South Africa?
Most certainly – faster than many would think. Available at a competitive price point, the Tesla system is ideally suited to meeting the power provisioning challenges faced by South African businesses and individuals on a regular basis – load-shedding and power-outages caused by any number of factors, including cable theft.
These issues are not commonly experienced in the US where the “green lobby” is more assertive as a technology driver.
Moreover, South Africans have to deal with regular hikes in the price of electricity and will soon face the introduction of time-of-day billing (or ‘smart-metering’) which will further increase costs. These inevitabilities will underpin the broad acceptance of the Tesla battery (and solar PV) as a cost-effective, efficient and professionally-supported alternative.
The Tesla battery can be charged from the grid during off-peak periods, supplemented by solar energy, or it can form the basis of an off-grid installation, relying entirely on solar PV/alternative energy sources.
Do you offer similar products already, which basically do the same?
Yes. Deep-cycle lead-acid batteries are readily available, while flow batteries and batteries based on other technologies are being talked about. However, they pale in comparison to well-engineered and cost-efficient Li-ion solutions. The Tesla system appears to be ideally positioned to address the power provisioning problems and challenges faced by South Africa. It will be a game-changer in the local marketplace.
