Additional ess system

Hi all
Much appreciated for any help
I would like to add extra storage mainly for my hot water set up,i have existing batteries which are pylontech [on the left diagram] but would like to use my older batteries [330AH lead acid 48v] [on the right diagram]
The whole system would be on both multi inputs ac
Not sure if there would be conflict between the energy sensors ,my thinking is the current sensor would be slightly faster on current detection
The system is ac coupled
The new system [on the right] would be using the solar 1.5kw to charge the lead acid batteries and also detecting hot water energy usage by the ac current sensor
Please forgive the fantastic architectural drawings
Many thanks