Second Life Battery Research – Another Project Milestone is Piloted
One widespread and suitable application for these are so-called
nanogrids, which in developing countries are usually operated with lead-acid batteries. They supply current for a whole road with up to 50 shops, restaurants and grocers. However, not only do lead-acid batteries have a negative impact on the environment; they are also unfavorable in terms of handling. For example, they are less
stable in their performance (discharge current and energy density), require intense maintenance and have a high transport weight combined with a short service life.
And so the idea was born as another milestone to manufacture an environmentally friendly 2nd life solar nanogrid on the basis of used e-tron battery modules and to test it in everyday use.
This is characterized by the following performance parameters and advantages: 24V direct current and 5 kWh system capacity. The service life is 10-15 years with a moderate rate of use and the charge and discharge state of the batteries is IoT connected. This allows it to be tracked using a SIM card and app. The new “2nd life storage battery” based on two used e-tron battery modules can thus replace four old lead-acid batteries in a nanogrid.
The first prototype of the “Nunam Solar Nanogrid” is currently being tested by an “energy entrepreneur” in Uttar Pradesh. For a small fee of 4 rupees per day (0.06 euros), small traders can purchase the new, sustainable power from a local energy supplier.
The new Nunam Solar Nanogrid allows up to 50 merchants to ply their trade, even at night. With immediate effect it is supplying a whole street with green electricity every evening, fully independent of the grid. This is generated during the day from solar energy and stored for later use.