The Hubble S Series is a standalone li-ion LiFePO4 battery. These lithium batteries are in the form factor of traditional lead-acid/agm/gel batteries (slightly SMALLER than a standard 100ah lead acid type battery).
NB - Please ensure you can set your inverter CUT OFF voltage to 12.0V, else the BMS will cut off and the battery will go into protection mode (and will need to be jumped)
This means that you can only use this battery in Axpert Inverter with configurable Voltage settings
We however recommend using this battery in a series connection to help equalize the battery voltages for optimal usage