In Click and Design, when configuring a 3-phase system, is the priority (and non-priority) load values the user provides meant to be the total 3-phase load (the sum of all 3 phases) or is it meant to be an average of the 3-phases (or equivalent to only 1 of the phases)?
Its the total power consumption expected for the system as a whole.
Please see this screenshot of a 3 phase system - the ‘max’ load is 12kW. I don’t understand why an error is being thrown for the 5kVA x 3 inverters to be undersized, if the priority load assumes the load is spread over 3 inverters. (12kW / 3 = 4kW which should be an acceptable max load for the 5kVA multiplus II… but if the model is assuming the load is ‘per inverter’ (not total load for all 3 inverters) then the 12kW max load error makes sense.)
I wish the documentation for the click and design model was clearer on this key point about how the load assumptions relate to the 3 inverters vs. each inverter in the 3 phase configuration.
Because the average continuous load is then modified by the multiplier next to it for the peaks.
12kW is near the max of a 5kVa inverter - the system quite literally wont do that without heat derating.
The little orange square in your screenshot explained the why. Re read it.
The word average implies there are times when the load is above that and loads below that.
In short the system is too small for the power you have configured for it to process and be stable with a long life span.
The problem is not click and design but product knowlege. And remembering heat detating in system sizing is a factor.
Yes I intentionally included the yellow error box in my screen shot so that it could be verified and I could better understand it - thank you for your explanation.
I see in the product manual (pasted below) that at 25C the max continuous output is 4000 Watts:
And when I modify the ‘ratio’ parameter to bring the ‘maximum continuous load’ below 12000Watts (or 12kW/3 = 4000Watts per phase) then the error message goes away:
Thanks for your patience with those of us still growing in our product knowledge.
-Matt
Just remember that if the system is not in an environment where it is kept cooler than 25°C this is an unrealistic continuous operating condition. The inverters get warm processing power like that