desiji

Did more than check the cabling traced fom the array to the mppt position couldn't see any fault if plug into the mppt the voc keeps fluacting between 60v sometimes 90v
it crashes. tested everything til we found out it was the Inverter, ws thinking flares and so tested but was getting maximum 452V as voltage to inverter

Hallo Coulomb,
I was not stating the Panels VOC but the Inverter VOC which is Rated at 500v my measurement at the breakers with the 13 Panels was around 405V

started with the construction of the Emoncms web, with the help from @Christosnake Doc.
 
first exP.-https://emoncms.org/dashboard/view&id=55138

Well, you'll miss out on the ability to mix if that happens. But the inverter will simply switch to bypass mode, so it can support loads of up to the limit of the relays. In other 5 kVA Axperts, these relays are rated for 40 A AC. I assume the King 5 kVA is no different.
It's too easy: it's the rated power of the inverter (5 kW). It will allow very short term overloads, up to 100% (up to 10 kW), per the advertising. Of course, that's more than 40 A @ 230 V, but I suppose a short term overload of the relay is permissible.
That depends on your household, of course. In the "average" house, the larger loads are often in the kitchen: oven, stove, kettle, dishwasher, toaster, microwave. Other high power items are the geyser, large air conditioner (especially if direct-on-load start (no inverter in the air conditioner)), washing machine, air compressor, hair dryer, electric vehicle charger, space heater. Things like geysers can vary a lot, but are often 2.4 to 4.8 kW.
Fridges and freezers are low power but high energy, because they run 24/7. So these are not a problem for this discussion.
As you can see, there are many potential high power loads in a typical house. So really it all depends on how many such loads are on at once. I have a single 5 kVA / 4 kW inverter, and for years with support from my family, have had little trouble avoiding the inverter bypassing most of the time (it bypassed perhaps once every few days). That was until I bought an electric car; now I'm seriously considering paralleling it with a second inverter. Of course, 4 kW models are now obsolete, and there are technical difficulties getting new and old models to parallel. If only I know someone who can patch firmware... 😉  (And if that someone had some spare time 😐).
Fortunately, Kings (like all the non-VM models) can be paralleled, so you can always start with one, and parallel it with another later if the need arises, and of course if funds permit. You will need a paralleling "kit" to safely parallel them, of course.