Jakes Louw

When an installation is done with what@Beatis describing, the loads are balanced and a good sparky will make sure that the loads are balanced at the Main DB. It involves making sure the load is spread evenly throughout the 3 phases. 
But I can attest that 3 phase motors can run well in such a set-up. This type of Single phase Parallel to make 3 phase power is quite a task to handle and it requires more space than a single 3¢ unit. There are also some rules to how it can be successfully done. The battery pack has to be shared by all the machines. In other words you can't have the batteries on individual inverters. They need a common battery bank. So voltages must be the same.
it's cheaper to acquire but more expensive to install if that makes any sense. But some good pros and less cons.

The new Infinisolar that will be launched in SA . Will be in 10kW and 15kW size. Will also feature 2 AC outputs . You choose what you want on either. Can be Essential and non essentials. 

I agree with Jakes. I have used Ryobi power tools for years and have had no issues. Currently using a Ryobi 18v cordless impact driver to re-do my roof joists. What a pleasure. Different matter if you are a contractor. Go for a more professional tool and take the (cost) pain. Another bonus for me is if it gets banged up or dropped I don't have to go into a corner and weep - unlike what happened to my expensive Bosch. The current Ryobi HandyLine range of power tools are another matter altogether.  

Hi Jakes, why do you not buy just one lithium-ion battery pack? The capacity will be vastly more than the Ni-Cads, you will rarely have to recharge.
I have successfully repacked three of my old Ni-Cad drills with recycled 18650 Li-ion cells. What a pleasure to have 5 battery drills on a job, each with a different bit. The torque is also impressive. One should ideally use high-drain cells, but I use high-capacity cells and double up more in parrallel (sp?) I do not fit BMS, just made sure cells are identical in specs, capacity and close in internal resistance. I suffer from familiar tremor, so soldering is not neat. A customer has offered to build me a spot welder, should take him up on it.
I see you are at De Wildt, not far from me. Bring your old batteries and I will try a re-pack.
 

Borehole can easily be converted to single phase, speak to Neels at https://cfptechnologies.co.za/ and he will advise as to what you can use, he has gear to run up to 4kw 3 phase motors on a single phase 220V supply.
Not sure about the other stuff but he should be able to advise, worth investigating as it could be a better/cheaper option. 
I would stick an Efergy Engage on it for a month so you can see what your peak power requirements are, is relatively cheap and very handy to have in any case. 
Preferably get the internet attached cloud one so you can get all the data (if you have wifi available on the farm)
 

Yes, I have a borehole on 3ph. I live on a small-holding, I have cold-rooms and various other items that use over 100kWh per day. 

Sunsynk is testing their 12kw 3 phase inverters. Maybe try contacting one of their local agents to find out a release date for SA. 

That's a different inverter to the one you linked. We're still awaiting pricing (and stock) in SA.