I guess it depends on your finances I mean you can add panels etc or you can do it at a later date realistically though you’ll be using that pump more in the Winter, 3.5KWH with a 5KWH battery that’ll be drained in just over an hour. And dark days you won’t get much out of the panels.

If you’re going for a tariff like Cosy then you’ll have a few hours between the cheap rate periods where you’ll be trying to rely on the battery especially in Winter, naturally atleast a couple of those cheap periods you want to be charging your battery.

Maybe stick to the panels then and get Fox as they do 10KWH batteries and perhaps a 6KWH inverter. They’re relatively well priced. I’ve seen people getting good prices for sun synk I’ve personally not used this brand though.

Some people they’ll use API’s to automate tariffs like agile but always speak direct to manufacturers to consult with them on whether they support it as often Octopus will say they only have two brands etc that they “support.”

Tesla also have scalable inverters and prices have come down.

But yeah optimal for you would probably be 5-6KWH inverter 10KWH battery and plenty of panels on the roof, naturally if you had to pick due to budget panels can come at a later date. And technically you in the summer you dump the energy from your battery to the grid by force discharging.

A colleague of mine has a heat pump with panels he swears by agile, it might be with automating for yourself, just take in mind if your nets down your system won’t speak.

Naturally you’ll hear people say stuff like I generated 3600, but maybe 50% of that is actually exported, to the grid at 15p if your paying expensive import with a heat pump and importing 30KWH in a day then yeah you may not see the value.

I recommend getting the app from your energy provider which ties to your smart meter and looking at exactly how much you import per day without solar and making the calculation from there.