A global MPP scan sweeps the PV operating range from time to time to find the true maximum power point. This matters when partial shading or modules at different angles create several power peaks on the curve. During each scan the inverter does not run at the maximum power point, so output drops briefly. Shorter scan intervals therefore cost more energy, and on ABB/FIMER units each scan takes roughly 2 seconds. On Solis inverters, SolisCloud has a switch that turns multi-peak scanning on or off and a scan interval setting of 600 to 10,800 seconds. SMA calls this function OptiTrac Global Peak on the Sunny Tripower TL-US, set with the parameters MPPShdw.IsOn and MPPShdw.CycTms. Its manual says the ideal interval is usually six minutes. Newer SMA inverters use SMA ShadeFix, which is enabled by default and usually checks the operating point every 6 minutes. On the Sunny Boy Smart Energy, its cycle time can be set from 180 s to 3600 s. ABB UNO-DM and FIMER TRIO inverters have a menu setting to enable or disable the scan and set the scan interval. The TRIO also lets you start a scan manually. On Yaskawa Solectria PVI inverters, MPPT scan is enabled by default with a 60 minute period. It searches in 5 V steps and can also be started from the MPPT SCAN menu.
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subclass_ofc1 drafted · lead Maximum power point tracking
Global scan is described as an extension of MPP tracking that finds several power maxima under partial shading.
sec=h64 h=b8c91c5707desec=h230 h=82dc537ec426sec=13 h=154a08a362a3sec=h159 h=ff0824ba155fsetting_rangec2 verified · fact 600–10800 SEC
Conditions: MPPT Multi-peak Scan Interval set through the SolisCloud remote control advanced settings
sec=h50 h=2f904674e9d7verified by: review-workflowverified on: 2026-10-24
c3 verified · fact 180–3600 SEC
Scope: products Sunny Boy Smart Energy US-50
Conditions: Cycle time of SMA ShadeFix, parameter DcCfg.MPPShdw.CycTms
tbl=33 h=004d364b23b6tbl=33.r1 h=50485e5136feverified by: review-workflowverified on: 2026-10-24review note: support check: partial - The 180–3600 s range for Cycle time of SMA ShadeFix is given, but the passages don't tie it to the specific product sma-sbse-us-50.
default_valuec4 drafted · lead nominal 6 MIN
Scope: products Sunny Tripower CORE1-US
Conditions: SMA ShadeFix time interval, enabled by default; the manual says the interval is usually 6 minutes
sec=h82 h=f1f39012a7absec=h78 h=f1f39012a7abreview note: support check: partial - Manual says interval usually 6 minutes and enabled by default, but the passages don't name the Core1 product.
c5 drafted · lead nominal 3600 SEC
Scope: products CPS SCH125KTL-AIO/US-600
Conditions: MPPTTime (MPPT Scan Cycle) value under the IEEE-1547, Rule 21 and ISO-NE grid codes
The table gives the value without printing a unit; seconds is assumed.
tbl=24.r26 h=2c4e8910eca9review note: review: partial - The row gives MPPTTime = 3600 under IEEE-1547, Rule 21 and ISO-NE, but it prints no unit, so 'seconds' is an assumption, as the note admits.
implements c12