Self-Consumption

Self-consumption and self-sufficiency :

Anticipating the evolution towards self-sufficiency, PowerTech Systems has decided to turn to Lithium-Ion storage batteries associated to independent systems of energy production.


All over the world, small districts will sparse population and often rugged geography are beyond the viable reach of the regional grid system. And many countries suffer from power outage too. Stand-alone renewables are the obvious solution. But electrifying remote areas means to provide a long masting solution with a reliable storage item and very low maintenance.

Production cost of renewable energy has decreased during the last five years

Energy can be produced on local mode connected with less and less grid : renewable energies are becoming cheaper (nuclear energy’s selling price is 0.12 Euros/kWh and will increase by 30% within 2017. Meanwhile a solar plant in Africa is 0.08 Euros/kWh)

Energy production for domestic use presents a good return on investment (price of photovoltaic cells has been divided by 6 in the last 3 years)

Supply of continuous source of energy on a local mode is the key issue

Solar panels do not work at night or in cloudy conditions, wind mills depend on wind conditions, power generators depend on oil supply.

Real time energy generation has to be stored to optimize domestic use with no rupture of energy and permanent control on the storage reserve level.

Storage capability must be durably reliable, eco friendly and ready to handle long short cut of power supply.

Why Lithium-Ion batteries for Self-consumption ?

Better Security

Lithium Iron Phosphate (new Lithium-Ion chemistry) will not burn and do not explode when charging is prolonged or overloaded

Greater energy density

Lithium-ion batteries have an energy density exceeding 150 Wh/kg. The energy density of a lead acid battery is about 20 to 30 Wh/kg.

Best performance

Lithium-Ion batteries support up to 5000 thousand charge cycles and discharge unlike conventional lead batteries (about 500 cycles).

Lithium-Ion batteries accept large flows of discharge (1C to 3C continuous and peak)

The discharge curve of a lithium-ion battery is nearly flat, which allows to obtain maximum power to the complete discharge.

Ease of storage

Lithium Ion batteries can be stored for long periods even if they are partially discharged unlike conventional batteries which need to be fully recharged regularly and frequently. The rate of self discharge of Lithium-ion battery is very low.

Better heat resistance

Lithium-ion batteries can withstand high ambient temperature (up to 60°C)

Minimal maintenance

Lithium-ion batteries do not need any maintenance

Better for the environment

Lithium-ion batteries contain no toxic heavy metals such as lead and cadmium

Better life

The lifespan of Lithium Iron Phosphate is far superior to Lead batteries even for deep discharge cycles (up to 20 years). Lifetime > 80% after 1800 cycles at 1/2C charge discharge