Most parts of the world use factors from 5 to 7
Ie 30kwatt/ 5 = 6kwatts 24/7/365 on a grid tied setup
or 30kwatt/ 6 = 5kwatts 24/7/365 on a grid tied setup
or 30kwatt/ 7 = 4.3kwatts 24/7/365 on a grid tied setup.
battery setups are more costly and batteries simply do not last long.
In NJ USA a 30kwatt is big for a home.
but 20 kwatt could fit on a decent roof.
out lay would be more than 20k but less than 35k
it would run three s17pro set to 40th and 1000 watts.
giving you 120th endlessly.
you need the correct after market firmware but it does exist.
so you could do 120th for free which is about 30 usd a day.
NJ ,USA has many incentives the array would pay off in under 6 years.
The storage is crucial. During peaking hours you won't consume 20KW. When you run lithium between 20&80% they last easily 10-20years.
There are also saltwaterbatteries. They last more or less indefinite since you can replace the anode by changing the saltwater.
Just not sure if they are available in the US...
it would run three s17pro set to 40th and 1000 watts.
Underclocking S19pros is a very interesting consideration!
Grid tie in the USA is better than any battery setup.
In the USA.
You get various incentives in the correct states.
The grid acts like your battery.
IE IN NJ use a factor of 6. So 20k is 3.33kwatts you constantly burn 3.00 kwatts with the clocked lower s17 pro and the left over goes to the grid. So in full sun 3k goes to the gear 17k reverses on your meter.
When sun goes away you tap the credits.
That is why a 20k system is good for 3.0-3.33 kwatts 24/7/365
Now you also get credits from the state of nj for 10 years in a row.
So the 30k you paid for the 20k watt system get paid off in 10 years.
The mining earnings are your profit.
But this is all due to state law somes states attack solar and protect oil.
NJ attacks oil and protects solar.
Batteries are not really viable as they are an extra cost.
They take you off the grid and you get lower incentives .