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Hi all, I am looking for advice on adding a inverter and linking it to a battery in our home.

Not sure what to ask an electrician to quote for and not sure if i will be able to find an electrician who will just supply the feed to the inverter location, or will need to find someone to supply and install the inverter as well. I also not sure if we want to supply the whole house and use the inverter / batteries when the kwh rate is at it highest, or have another circuit setup just for the inverter circuits such as my home office and a couple of new sockets in the kitchen,these will be used for airfryer etc . Looking at G98 certification., I have used victron before but if i go for a 48/5000 that will be a G99. We are in derbyshire.

Hi there, welcome to the forum.
I'm sure you'll get lots of good advice here.

My thoughts as a non-expert are that if you're going to the trouble of fitting an inverter and batteries, it is worth feeding the whole house, and getting enough batteries to meet your usual daily needs, so you can have a cheap rate TOU tariff, eg. Octopus flux, to charge the batteries overnight & then use the stored energy during the day.

If you get the whole system fitted by a company, the whole system is vat free - on the other hand, lots of people on here have bought batteries from China for less and installed themselves.
Also, the mcs certification and g98 approval is easier if done by a registered company.

It's also good to get an idea of options for future expansion too, eg. Solar pv, EV charger, so you don't make life more complicated for your future self.
I know I wished I'd started out asking questiins here before I had my solar & battery system fitted!

Welcome to the forum Alfie.

I did a similar system to what you are considering with Victron Multiplus and batteries from China, the system runs the whole house.

Welcome.
Not much background detail there.
These days all what you require is fitted in one box-inverter,batteries, switch to islanding and charging on TOU (Time of Use) tariff. The Tesla powerwall does this but there is cheaper alternatives i am sure.

electric-alfie, I am reading your email as if you don't currently have any Solar PV, are not looking to add any Solar PV and just want a Inverter and battery function to take advantage of TOU tariffs ?

If so, several on here have done just that, but if your thinking of adding some Solar PV in the future then fitting a Hybrid inverter would be advised as they can take either or both Solar PV and Batteries.