Solar PV plus battery solutions: Prices poised to plummet

Solar PV plus battery solutions: Prices poised to plummet

By Jack Ward, CEO of Soltra Energy

I’m on record as saying that the Tesla Powerwall, the revolutionary wall-mounted lithium-ion battery-pack, will gain general marketplace acceptance faster than predicted.

The latest news from Tesla certainly supports this. At launch earlier this year, the Powerwall was cheaper than most industry watchers were prepared for, mainly because Elon Musk, the South African-born founder of Tesla, was determined to demonstrate the broad global acceptance of his brainchild.

Now, the prices for all variants of the Tesla Powerwall are falling faster than expected even before the first Powerwall has been shipped! For example, the average Tesla Powerwall battery price on launch was around US$ 547/kWh. Now it’s around $350/kWh and set to breach the $300/kWh price point soon. What will it be when worldwide distribution begins in 2016?

According to industry watchers, Tesla’s batteries are already seven years ahead of the market when it comes to pricing, giving tens of millions more customers the opportunity to cost-effectively install solar PV plus battery systems in their homes.

Consequently, when the customer-friendly, aesthetic, well-designed Tesla Powerwall makes its appearance in SA it will have a ready market waiting. Expect stocks to evaporate faster than water in a parched desert. Globally, reserve orders are mounting - around $800-million worth as we speak.

Why are prices falling so fast? It’s due to the battery’s application in the automotive market. In the US, electric vehicles are big business. Already more than 3 million electric-drive vehicles are on the roads. Tesla, BMW and now Mercedes-Benz are vying for the lion’s share of this burgeoning market.

Bringing down the cost of an electric drivetrain is therefore an important step in increasing the adoption of zero-emission vehicles. Vehicles sales are thus at the centre of this development.

Here, in electricity-starved SA, electric vehicles may not be a priority, but preparing for disruptive load-shedding and soaring electricity prices is. With Testla lighting the path ahead, cheap battery storage is set to boost the acceptance of rooftop solarPV plus battery solutions beyond all projections. It’s a technology whose time has finally arrived.

Find us:

www.soltra.co.za

  

How susceptible are rooftop solar panels to devastating storm damage?

How susceptible are rooftop solar panels to devastating storm damage?

By Jack Ward, CEO of Soltra Energy

How do solar PV panels stand up to the extremes of rain, wind and hail? What about their resistance to the fury of the typical Highveld thunder storm? It’s a good question, considering the expected lifespan of a solar PV installation is 25 years or more. It’s bound to see a good many storms in its lifetime.

Fortunately, the answer is certain panels – from reputable manufacturers - stand up very well to the rigours of harsh weather. The key is to select panel arrays capable of withstanding Mother Nature’s rage and ferocity at its worst.

Panels featuring tempered glass, for example, are particularly strong and long-lasting while amorphous panels, combining flexible plastic material, are highly resistant to hail damage and any harm that may occur (unlikely) will not substantially affect the array’s performance.

The strength of solar PV panels is measured and rated in a number of ways. The first rating is for static loading – usually applicable to snow loading - which shouldn’t interest us here in sunny South Africa.

What should interest us is the rating for wind loading. Wind is a much more dynamic force and can fluctuate in intensity rather rapidly. This is referred to as mechanical load.

Solar PV installation by Soltra Energy

While static and mechanical loading are tested in different ways, the combined force a panel can withstand is measured in Pascals (Pa). The normal test threshold is 2400 Pa, but it’s best to choose a panel capable of passing a mechanical load test of 5400 Pa – particularly if it’s going to be part of an array sited in extremely windy areas, such those found along the eastern Cape coastline.

By far the most impressive test of a solar PV panel is for its hailstone resistance. The Class 4 hailstone test (devised by the Renewable Energy Test Centre in California) subjects solar PV panels to multiple impacts from 50mm diameter hailstones – bigger than golf balls – frozen at minus 17degrees, at terminal velocities of 76 metres per second or a staggering 400-plus km/h. Panels that pass this test represent the very best available.

So, if you are in the market for a rooftop solar PV installation, take out good insurance in the form of a quality solar panel array from a reputable supplier and breathe easy for 25 years or more.

  

Find us:

www.soltra.co.za