@BoroBoy
if you want to upgrade to Victron . . . . . .
The get the same battery . . .
get a 100ah Lithium battery to swap out your AGM one, like this - https://amzn.to/3oaKvrg
+++
Then get the Vic` Orion DC-DC charger (30A) - Victron Orion Smart 30A 12V DC to DC charger with Bluetooth connectivity: Amazon.co.uk: Electronics & Photo

+++
add a solar MPPT to the mix, ie a 75/15 - https://amzn.to/31dYLXj

++++
add a smart shunt if you wish . . . - https://amzn.to/3lsGo8q

++++
The Monitoring APP is Free - VictronConnect App - Victron Energy
++++
Then add an inverter . . . 1200w - Victron Energy Phoenix Inverter 12/1200 230V VE.Direct UK - PIN122120400 : Amazon.co.uk: Electronics & Photo

++++
FYI, i have all the above kit, Victron and Renogy and can vouch for it all.
...
if you want to upgrade to Victron . . . . . .
The get the same battery . . .
get a 100ah Lithium battery to swap out your AGM one, like this - https://amzn.to/3oaKvrg
+++
Then get the Vic` Orion DC-DC charger (30A) - Victron Orion Smart 30A 12V DC to DC charger with Bluetooth connectivity: Amazon.co.uk: Electronics & Photo

+++
add a solar MPPT to the mix, ie a 75/15 - https://amzn.to/31dYLXj

++++
add a smart shunt if you wish . . . - https://amzn.to/3lsGo8q

++++
The Monitoring APP is Free - VictronConnect App - Victron Energy
++++
Then add an inverter . . . 1200w - Victron Energy Phoenix Inverter 12/1200 230V VE.Direct UK - PIN122120400 : Amazon.co.uk: Electronics & Photo

++++
FYI, i have all the above kit, Victron and Renogy and can vouch for it all.
...