Fastest charge inverters

[electric-alfie]

Hi,apologies for re opening this, I am looking at a 48/5000 and really just want to import from the gid and use it when prices are more expensive such as octopus agile tariff, i have some solar 1600 w but mainly i need a decent battery charge rate . I am on the lookout for an installer / electrician and dont know wether i neeed a victron expert to do the comissioning and testing etc, for the g99 or stick with g98 as i wont be exporting.