- Set up solar panels + Battery storage = Price X
- When Energy bill > 20% of Price X
- Finance will fund the off grid set up. (cost of money around 7% for unsecured loans + principal repayment)
It will be much like what happened with our shift from the dumb phone to the smart phone. We have a contract to pay off the hardware (which actually includes hidden interest costs), but in this case, the hardware is paid for by the money we’d normally be paying the electricity company with a quarterly bill. But now it will go to the companies setting up a mini power plants in our homes.
So where are we today with the cost of going ‘off grid’ and having enough energy to power our homes?
The average home in Melbourne, Australia (where I live) uses 16 kwH per day. In order to set up a solar PV, inverter and battery system which can provide this level of energy on a daily basis, in all weather, it currently costs around $25,000 – just google “off grid solar 16kwH” to see the various options. The current average energy bill in Australia is $550 per month. Already the cost is very close to the switch covering the cost of finance and repayment in 3-5 years – the typical length of unsecured loans. The switch will happen very quickly when we consider the rapidly declining cost of both solar panels and batteries. Currently the cost of Lithium Ion rechargeable batteries is falling by 40% every 2 years driven by large scale production efficiencies. Based on the current price trend, within 5 years the cross over will start to occur.
And here is where it gets interesting. It will happen quicker than we think based on other non-battery based system efficiencies:
Solar Panels (PV cells) cost performance improvement 20% per doubling of manufacturing capacity – otherwise know as Swanson’s Law. This too will continue. Within 5 years their cost will be 75% less than they are today, and they will be more efficient at capturing energy, due to energy capture improvements. Since 2011 the average PV panel went from only capturing 11% of available joules of energy to 19% currently. Add to this the potential of a curve jump to better technology and we could surpass even our current optimistic estimates. A report just this week from the Journal of Material Science revealed a way to recharge Zinc Air batteries which could be 5 times more efficient than Lithium Ion.
And finally, lets not forget that the amount of electricity / and energy we use in the home currently has wastage rates of up to 30%. New devices and IoT functional smart homes will significantly reduce the energy wastage in our homes. Once our houses become IoT enabled, not only will the efficiency and capture of an off grid system be much better, there is a highly likelihood we will not require as much energy as we do today. This is because most devices requiring energy in our homes will essentially become computers. This is where Koomey’s Law comes in. Koomey’s Law states that at a fixed computing load, the amount of battery you need will fall by a factor of two every year and a half. This will have a more dramatic impact on the energy industry as most machines we use computerise.
When we add this up, all these pieces from different previously isolated sectors, it is clear to see we’ll have all the energy we need from the sun and other sustainable sources. Which means, that unless you sell oil or burn coal for a living, the future is certainly bright.
Check out my new book – The Lessons School Forgot – thrive in the technology era.