Record the exact regional models first
Write down the full module and inverter model codes, including suffixes. Manufacturer families often contain variants with different voltage, current or grid ratings. Use the current datasheet for the market where the system will be installed, not a reseller summary or a specification copied from a different regional SKU.
Check cold open-circuit voltage
Module open-circuit voltage rises as cell temperature falls. Calculate the expected cold-weather string Voc using the module temperature coefficient and the design minimum temperature, then compare it with the inverter absolute maximum DC voltage. Exceeding that limit is not an acceptable clipping strategy; it can damage equipment and invalidate approvals.
Check hot operating voltage
Module operating voltage falls as temperature rises. A string that looks comfortable at standard test conditions can fall below the inverter MPPT or start-voltage window on a hot roof. Check the expected hot Vmp and make sure the inverter can stay on its intended tracker window across the usable operating range.
Current limits are separate from voltage limits
Compare module Imp and Isc with the inverter input-current and short-circuit-current limits per MPPT. Parallel strings add current. High-current modules can be incompatible with older inverters even when their voltage is acceptable. Never assume clipping on the AC side makes excessive DC input current safe.
Document the final string map
Keep the string count, modules per string, tracker assignment and design-temperature assumptions in the commissioning file. Cross-check with the cold-Voc guide and array expansion checklist. Final electrical design belongs with a qualified designer/installer under local rules.