|Battery Name||Ecoult UltraFlex|
|Technology Class||Advanced Lead Acid|
|Maximum Charge Rate||-|
|Maximum Discharge Rate||13.9 kW|
|Rated Capacity (@ 100% DOD)||14.1 kWh @ C10, 9.9 kWh @ 1C|
|Recommended DOD||60% (twice daily cycling), 50% (accelerated testing)|
|Size||840 L (cabinet holds up to 28.2 kWh)|
The UltraFlex is a 48 V battery bank and BMS provided by Ecoult. The technology is considered to be advanced lead-acid because the negative electrode of a traditional lead-acid battery is enhanced with a carbon treatment to create an ultracapacitor within each cell that changes the chemistry and performance to allow the battery to operate in continuous partial SOC, where internal resistance is lower. The UltraBattery technology was invented by Australia’s CSIRO and is now commercialised by Ecoult in Australia, Furukawa Battery Company in Japan, and East Penn Manufacturing in the US. The batteries for the UltraFlex system are manufactured in East Penn’s manufacturing plant in Pennsylvania and the BMS, software and racking is designed and made in Australia.
The unit is connected to an SMA Sunny Island inverter that will charge/discharge the batteries.
Testing update: In September 2017 Ecoult removed some underperforming battery units from this test for analysis and identified that its control system algorithm (specific to the site) allowed some cells to stray beyond their normal cycling limit for extended periods, accelerating deterioration. Ecoult updated their control and replaced all batteries under warranty. Cycling of the new batteries commenced in January 2018.