Knox children centres cut 75% of energy costs in winter with Redflow batteries

Two state-of-the-art children and family centres in Melbourne’s outer eastern suburbs have eliminated three-quarters of their energy costs during winter with insulation, solar panels and Redflow batteries.

The Knox Children and Family Centres at Wantirna South, which opened in January 2019, and Bayswater, which opened in March, each contain 100 kilowatts peak (kWp) of photovoltaic solar panels and 18 Redflow ZBM2 batteries, storing as much as 180 kilowatt-hours of energy. They also include innovative insulation and thermal sealing to retain heat in winter and cooling in summer.

The performance of the integrated solar panel and battery systems in their first months exceeded Council’s expectations, generating 75 per cent of the power requirements for both of the hubs during winter. The installation of the solar array and batteries is anticipated to save Council an estimated $110,000 – $120,000 per annum at each facility, delivering a total annual saving of $220,000-$240,000.

The Knox Children and Family Centres at Wantirna South and Bayswater are pioneering projects at a number of levels. As well as the high level of energy efficiency and renewable energy integration, the buildings were designed to last for 100 years each – twice as long as the typical 50-year life cycle for most commercial buildings. The solar PV arrays and ZBM2 zinc-bromine flow batteries, designed and manufactured by Australian company Redflow Limited, were installed and configured by Redflow partner: Seven20 Electrical.

Flexibility and economic efficiency were intrinsic to development of both buildings, which were designed as multi-purpose type facilities that can meet changing community needs over the years.

The increasing cost of electricity made energy efficiency a priority for the two centres. This involved a holistic approach to Environmentally Sustainable Development (ESD), which included comprehensive insulation and thermally sealing the buildings with double glazing.

The Council also drew on its extensive experience with solar arrays and battery storage from the past decade when planning to integrate solar collection and storage into these two new hubs. This included the use of lead-acid and lithium-based systems, which have battery chemistries that lose energy storage capacity with use and time.

Council selected zinc-bromine flow batteries to provide energy storage for the two new Children and Family Centres because of their potential for a longer life cycle and their ability to discharge all energy on a regular basis without affecting the storage capacity or longevity of the batteries.

As well as retaining the original 10 kWh energy storage capacity throughout their operating life, other benefits of zinc-bromine flow batteries include a reduced fire risk compared to other battery chemistries and components that are easy to recycle or reuse at the battery’s end-of-life

With estimated energy savings of $220,000-$240,000 each year, Council expects to achieve a payback period of about five years on the solar arrays and ZBM2 batteries at the two new centres.

Click here to read the full Redflow case study about the Knox Children and Family Centres at Wantirna South and Bayswater

About Redflow

Redflow Limited, a publicly-listed Australian company (ASX: RFX), produces small 10kWh zinc-bromine flow batteries that tolerate daily hard work in harsh conditions. Marketed as ZCell and ZBM2, Redflow batteries are designed for high cycle-rate, long time-base stationary energy storage applications in the residential, commercial & industrial and telecommunications sectors, and are scalable from a single battery installation through to grid-scale deployments. Redflow batteries are sold, installed and maintained by an international network of energy system integrators. Redflow’s smart, self-protecting batteries offer unique advantages including secure remote management, 100 per cent daily depth of discharge, tolerance of high ambient temperatures, a simple recycling path, no propensity for thermal runaway and sustained energy delivery throughout their operating life. sustainable energy storage