You can turn off your miners using apps on smartphone like hiveOS application or through the browser, I do this a lot without getting closer to my mining rigs.
If you off your router the miner will still keep running but with less power consumption compared to when the miner is fully working with the internet connection.
I prefer having extra juice available when mining with solar panels so that my battery bank can also recharge fully for night use, I hope you have some calculator? I am not sure that running 2 S9 and 1 S19 with extra asic miners on a 10kw is a good idea.
I might be wrong but you should do some calculations first.
My optimum result would be for an Automated turn on/off by time/r option in firmware - will check if HiveOS can help.
I have just test loaded DJayOS into an S9 as the old stock firmware was running the unit a bit hot and causing lots of reboots on the hot days. I now have the S9J under clocked running at a reliable 10TH at around 1KW for our 10 hours of daylight. The S19 runs at 3K3 watts so in total I have 5300 watts of miners running and accessories(fans/pumps) using only 250W. So I don't have an issue is running 6000 watts on a 10,000 watt system.
I feel I can squeeze 2Kw more out of the system as the panels still fully charge the batteries by 10 am.
More panels and inverters are planned if I can find them cheap enough.
The more load you add to your solar energy build the longer your battery bank takes to fully charge, also you should know that it won't always be a sunny day, there are rainy seasons as well, make sure you have enough power left to charge your battery bank per day while mining with all the rigs at the same time.
My solar battery bank started misbehaving when I add to much load, I meant the battery bank wasnt lasting as it supposed to until I remove a rig, extra power is very important, for buffering sake and keeping the full battery at full.