We can offer battery options from Victron, MG Energy Systems, and Mastervolt. We are in the process of certifying more batteries over time. Nominal 24V batteries need to be in pairs. Victron batteries come in 10kWh increments and the MG LFP in 14.2kWh increments .
The Victron and Mastervolt batteries are more expensive 6 x Victron or Mastervolt 5kw batteries will give you 30.7kWh of battery bank
The MG LFP are more cost effective 4 x 7.2Kw batteries will give you 28.8kWh of battery bank
Victron however are tried and true batteries, MG were the former supplier of Victron.