ReLi

25 Oct, 2021

ReLi

All over Europe, programs incentivizing the installation of renewables for homeowners are ending. These programs allow residential homeowners with solar panels to sell extra electricity produced to the grid and offset their electricity bills.

This project is a submission to Wevolver's Engineering Student & Researcher Communication Program. This program enables a student or researcher to get their work seen by thousands of engineers and tech companies which can increase its impact, lead to collaborations, raise your public profile, and improve your career prospects. Check out all the submissions here.


Problem Description

All over Europe, programs incentivizing the installation of renewables for homeowners are ending. These programs allow residential homeowners with solar panels to sell extra electricity produced to the grid and offset their electricity bills. As these systems come to an end, new solutions and new business models are needed to manage the extra electricity and maintain the momentum of decarbonization. The only solution to this is to store this extra electricity in batteries. The problem is, brand-new batteries are rather expensive, adding to the capital investment of a solar system, and are not sustainable and not environmentally friendly in their production and raw materials sourcing.

Parallel to this, electric vehicles (EVs) are increasing in popularity as a sustainable alternative to traditional modes of transport. Yet, after around 10 years of operations, the batteries of these EVs need to be replaced for safety purposes, although they still retain around 80% of their capacity, meaning they still have plenty of capacity left for stationary applications.

Right now, these batteries either go to waste or they go to recycling companies. However, the capacity of recycling companies is still not big enough to take care of all the batteries coming in. In order to avoid these EV batteries piling up at recycling centers, ReLi refurbished them and offers a more sustainable and affordable energy storage solution for homes with solar panels that complements the strive towards a carbon-free Europe, by inciting both the consumption of reused materials and solar energy.

Product Description

ReLi manufactures sustainable and affordable energy storage solutions for solar PV homeowners by refurbishing batteries from electric vehicles.

ReLi takes retired EV batteries - which usually still retain 80% of their initial capacity - to refurbish them. They are dismantled and tested for individual cells and modules, assembled into a modular battery box, and finally, an innovative Energy Management System (EMS) is applied. This EMS smartly controls the charging and discharging of the battery to optimize its use and extend the lifetime of the battery to 1.5 years more, matching the lifetime of brand new batteries. The product can also be easily interconnected to provide different capacities depending on the home’s specifications, making it very versatile.  

These batteries will be sold online to PV installers, battery retailers, and direct customers (homeowners), at around 250 €/kWh, around 60% of the price of a brand new battery. Rental service of the batteries will also be available, for about ~75 €/kWh/year, for a minimum of 3-5 years, as well as additional maintenance services and other forms of assistance, for a yearly subscription of 100€. On top of retailing through the company website, ReLi plans on establishing a presence and using digital social platforms to market its product.

ReLi solves the problems identified by refurbishing retired EV batteries for a second life, thereby offering a more affordable and sustainable energy storage alternative to homeowners and simultaneously promoting a more sustainable, circular economy.

Choosing ReLi over a brand new battery means a reduction in CO2 emissions of 40% and a reduction in the cost of 60%. Thanks to ReLi’s innovative Energy Management System (EMS), ReLi batteries can be smartly managed, increasing their lifetime by 1.5 years, meaning that the lifetime of the battery is 10 years, the same as a brand new battery. Installing a ReLi battery can increase a household self-consumption of 40% of the price and a reduced levelized cost of storage (LCOS) up to 0.6 €/kWh.

Moreover, ReLi batteries are designed to be interconnectable, meaning that they can be interconnected and reach any capacity needed from our customers.

Specifications

ReLi's Battery

Weight20 kg
Dimensions 50x50x40 cm

Central Control Unit

Dimensions5x5x5 cm

More about Laura Laringe

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