Calculate the maximum string current It is typical for arrays connected to SMA inverters to be installed without DCU (DC conditioners/optimisers). AS/NZS 5033:2021 3.3.3 (a) describes how to calculate ISTRING MAX where no DCU are installed. ISTRING MAX = 1.25 x KI x ISC MOD Generally, KI has a value of 1 except where. .
Check backfeed current of inverter MPPT DC input. ISTRING = ISTRING MAX or IBF TOTAL(whichever is greater) IBF TOTAL is the backfeed. .
Calculate the maximum array current IARRAY = SA x ISTRING MAX IARRAY is the maximum array current in Amps. SA is the number of strings in the array. ISTRING Maxis the. [pdf]
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