FOR ALL MODULES, THE CALCULATIONS NEED TO BE PERFORMED OR VERIFIED BY USING A
STRING CALCULATOR OR CONSULTING A PROFESSIONAL.
The inverter has two MPPT PV charging circuits. MPPT #1 and #2 will utilize up to 17 amps, which
means two strings can be paralleled for any modules having less than 8.5A (Imp) rating.
When sizing strings for each MPPT, they MUST be the same model, brand and # per string
(series and parallel).
All panels on a series/parallel string should face the same orientation and be exposed to
roughly the same shading across the string. Consideration should be placed on string location
and wiring order on the racking to minimize shading eects. One shaded module will
disproportionately reduce the output of the entire string. This can be mitigated by avoiding
linear strings in favor of rectangular strings, or by the use of string optimizers.
5.5.3 PV WIRING INSTRUCTIONS
Step 1: Before installing PV wiring into the inverter, please ensure all breakers and disconnects are
open (o) and confirm the PV strings are not energized by using a multimeter to ensure there is no DC
voltage on the lines. Once that has been verified, please proceed to step 2.
Step 2: Strip o 1/4 - 5/16 in. (6 – 8mm) insulation from the PV strings’ positive and negative
conductors.
Step 3: Insert the conduit fitting into the openings for the PV connections and tighten from the inside
using the counter nut.
Step 4: Route the PV conductors through the conduit fitting and into the inverter.
Step 5: Secure the PV conductors in place into their respective terminals and torque to 10.6 in-lbs. (1.2
Nm). Verify the cables are secure by lightly tugging on them.
Step 6: Ensure the conduit and conduit fittings are fastened reliably, and the cable entry holes are
sealed.
WARNING: Please follow the steps listed below to ensure proper PV connections.
NOTE: The array may have a higher Imp than the 17A specified, but the MPPTs may
not make full use of the extra current which could lead to component deterioration
All exposed metal parts of the system must be grounded regardless of
voltage, including solar panel frames.
DO NOT GROUND NEGATIVE PV LINES, ONLY SOLAR PANEL FRAMES!
If using fine stranded wire, use ferrules to secure the connections to the inverter
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