So now I have a solar PV system how do I make the most of it???

Just a thought. Is using a dishwasher better for the environment than washing by hand?

Water heater diverter...

I have the iBoost, since installation of my system at beginning of July this year we have not had the boil on at all.
We get ample hot water every day, it tends to be hotter than when we were using the boiler for hot water.
There are 3 of us in the house, 2 adults, 1 child so usage is probably just below average.
Not sure on the size of the tank, it stands about 1.2 metres high, about 60cm diameter but probably has insulation under the outer metal skin.
Our diverter seems to be diverting about 3.5kWh per day to keep it hot.

Dishwasher....

We don't use our dishwasher much, (it came with the house). We found that it really does eat electricity. The heater part runs at just under 3kW and does this twice per wash for what seems to be ages, (probably main wash and then the rinse cycle). We only use it at peak generation time (11am to 1pm) when we have spare electricity.

Since having solar pv, we have been watching every watt. I am not a green person by a long way, but tight, haha.

What you need to consider is how much you generate in the darker months and how much would be available for space heating. The answer from a normal system is not much. In the in-between months, so about now until the end of October and March/April, you may have sufficient excess to help keep the central heating off for a while longer/few weeks earlier but not enough for serious space heating.

If you think about space heating, and ignoring the gas you use for heating water, if you burn through 12,000 kWh a year, that is about 2000kWh per month or about 70kWh per day. And per room?? Compare that with an excess of perhaps 15kWh from your PV in the middle of July, reducing to perhaps 1kWh in January and a picture begins to emerge...

I haven't gone down the storage heater route as they don't look that good, are bulky, immobile and expensive unless you go top-end when they are ridiculously expensive. But I do have a couple of oil-filled radiators on my diverter. Each is 2.4kW, so when one reaches its temperature the other turns on and so forth. Clearly they only provide heat while the sun shines but we have found (only second autumn using them) that they keep the living room a degree or so warmer. We have just dragged the kit out of summer storage and yesterday ended up with a slightly over-warm living room an hour before the sun went down but were comfortable until bedtime, rather than grabbing for jumpers. This morning I see we are a couple of degrees warmer than we have been at this time for the rest of this week. Some of that is of course direct sunlight heating the room yesterday afternoon but some is the radiators.

My rads cost about £130 in total, plus a bit of cable, but storage heaters are 3 or 4 times more expensive and unlikely to be economically viable over any reasonable period - unless you find something second hand for a reasonable price...