Yeah definitely the size of the solar array up on your roof will affect the amount of battery storage that you'll need in your home. What's important to understand, is what your, how much energy you're actually using in the home, and how much you're exporting back to the grid. Basically what you're exporting back to the grid is the amount of storage you can put into the battery. So you've got to make sure that that ratio is right.

Generally at the moment, as a rule of thumb, it does make a lot of sense to oversize your solar system. If you're just doing solar, or solar plus a battery, there's some pretty friendly government incentives and rebates out there which is really offsetting the cost of the solar panels. So if you've got the roof space, we say load up as large as you can typically. And that would give you the best return. There needs to be an assessment by a qualified installer who can look at your bills, find out how much you're exporting and importing, whether the battery is worthwhile for you, or if maybe you need more solar generation. Please make sure you're using the right quality gear within there, so you know the quality of panels and inverters within that system.

It's definitely possible to have a AC couple battery system on your home, without having an actual solar array on your roof. You could be potentially purchasing the electricity off peak rates, so maybe from midnight to 4:00 AM, and then discharging during peak times, later in the day, in the afternoon. It's not very common because there's not a great cost benefit from doing that. It's a lot more cost-effective to be charging from your own solar generated energy, that you would have been exporting anyway.