Engel

We only connect low revving gensets, 1200-1500rpm diesels to systems. Never seen a small generator working reliably. We would mostly install a changeover to run the house till the pv has sufficiently charged the batteries. Yes you do need a 20kva unit

Great install. I like the multiple inverters as it gives yiu redundancy, and for that reason I also like 5kw battery stacks.
Top notch work. Many can criticize, few can do 

Great install. I like the multiple inverters as it gives yiu redundancy, and for that reason I also like 5kw battery stacks.
Top notch work. Many can criticize, few can do 

Stage 1 assessment.
I did the initial assessment at the guest farm and what a surprise as how thing's are done. The inverters and battery combo was purchased through a reputable solar company but the installation was done by local electrical contractor that i would rather not name.
This farm cater for around 30 to 36 guests at any time with 12 guest cottages no self catering, 3 meals done from kitchen that is gas reliance. Each cottage was initially supplied by a 1000va inverter powered from a 12v 100ah AGM battery installed inside the cottage right next to the main bedroom and the fan never switched off. After many complaints the inverters was moved outside, but still audible in the quiet, tranquil environment. So next step put a label on the inverter to switch it off if noise becomes unbearable. Below pictures i took when staying over and believe me the noise was irritating.

 

 

 

Read the label above🤣

 
Stage 2 the new installation.
4 x 12kw3Ph Sunsynk inverters supplying independently. 3 x inverters servicing the cottages and 1 supplying the dining room. 4 x 20kwh FW in parallel supplying the inverters. 60 x 460w Seraphim Siv Series solar panels connected 15S1P 4 strings(30xNE and 30x NW) each string connected to Mppt1 on each inverter. Each string Voc 622.8V+16%(-20°C)=722.5V.  It appears the  lowest  temperature that has  been recorded  in Southern Africa was  in  one  of the valley's  of Lesotho, just to the west  of the escarpment (near Sani Pass) close to the guest farm hence the reason for such a low offset on solar. 
This time around i used good old fashion cable racks to accommodate the 95mm² battery cables running some length to each inverter.
I used exactly the same solar panels (Seraphim Siv 460wp)in the Checkers CL 33 install as they perform very well.
I occupied their "sort off" board room for the inverters and batteries 😜

Sort of "board room"
 

 

 

 

 

This above distribution was re-done twice hence the labelling "work in progress"

4 curcuits used 2 spare. 
The most difficult and annoying part off this installation was the laying of the 165 meters of 16mm² SWA cable different lengths different directions.😩
 
 
 

This is the new style of installation no airflow!!!!

For CoCs and insurance you must do what they want. In terms of safety I would prefer one earth. If you have to go to multiple earths, you want to connect them all together with big conductors. Otherwise lightning hitting close to your house may choose to make some loops through your house.