SOLIS S5-GC75K-US - User Manual

SOLIS S5-GC75K-US

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User Manual

for S5 Series Grid Inverter

Version 1.8, Release Date: 11,2022

Applicable models

S5-GC75K-US

S5-GC80K-US

S5-GC90K-US

S5-GC100K-US

Table of Contents

Questions and Answers

M
Matthew PowersSep 18, 2025
What does PV ISO-PRO 01/02 mean on my SOLIS S5-GC75K-US?
- J
  John ReeseSep 18, 2025
  The PV ISO-PRO 01/02 error on your SOLIS Inverter indicates that the inverter detects low DC insulation resistance. Inspect the installation, reset the inverter, and note the weather conditions when the alarm occurs. Measure the insulation resistance; if it's normal, measure it again in the same weather conditions as when the alarm occurred. Physically check the cables. If the problem persists, replace the inverter.
J
Jason DavisAug 25, 2025
How to fix a NO-GRID error on a SOLIS S5-GC75K-US Inverter?
- P
  patricia52Aug 25, 2025
  If your SOLIS Inverter displays a NO-GRID error, it means the inverter isn't detecting the grid. To troubleshoot, with the DC switch OFF, check the AC voltage at the inverter test points (L-L, L-GND). Also, check the LCD reading, as there may be a bad measurement circuit. With the DC switch ON, check the grid standard. If the issue persists, replace the inverter.
T
thompsondonaldAug 25, 2025
What to do if my SOLIS Inverter shows 'Over Temperature'?
- S
  Sharon EsparzaAug 26, 2025
  If your SOLIS Inverter is showing an 'Over Temperature' error, check the ventilation around the inverter to ensure it's not obstructed. Also, verify whether the inverter is exposed to direct sunlight during hot weather.
S
Scott RichardsonAug 26, 2025
What to do if SOLIS S5-GC75K-US LCD has no power?
- M
  Mrs. Melissa Meyer DDSAug 27, 2025
  If your SOLIS Inverter's LCD has no power, check the PV input connections. Also, verify the DC input voltage (single phase >120V, three phase >350V) and ensure that the PV+/- connections are not reversed.
A
Alexis HudsonSep 22, 2025
How do I resolve an INI-FAULT (Initialization Protection) error on my SOLIS S5-GC75K-US?
- M
  Michelle GonzalesSep 22, 2025
  The INI-FAULT error on your SOLIS Inverter indicates that the Master and Slave DSP have different values. To resolve this, reset the inverter by turning the DC switch OFF, waiting until all lights/LCD turn off, and then turning the DC switch ON. If the issue persists, replace the inverter.
J
Jessica ColemanSep 23, 2025
Why is the screen blank on my SOLIS Inverter?
- N
  Nicholas StevensSep 23, 2025
  If your SOLIS Inverter screen is blank, it could be due to low or missing input voltage, reversed polarity, or a damaged main board. To troubleshoot, with the DC switch OFF, test the PV connections, check the polarity, and ensure the voltage is greater than 200V. With the DC Switch ON, check the voltage again to ensure it's greater than 200V. If the DC voltage is "0", replace the inverter.
M
melissa50Sep 9, 2025
What to do if a SOLIS Inverter shows UN-G-V (Under Grid Voltage) error?
- T
  Tyrone SimpsonSep 9, 2025
  If your SOLIS Inverter is showing a UN-G-V error, it means the inverter detects the grid voltage as being too low. To troubleshoot, with the DC switch OFF, check the AC voltage at the inverter test points. If the AC voltage measures low, adjust the lower limit with permission from the utility. Also, check the LCD voltage reading, as it may be a bad measurement circuit. With the DC switch ON, check the grid standard. If the issue persists, replace the inverter.
J
Jacob BowmanSep 12, 2025
What causes an OV-G-F (Over Grid Frequency) error on a SOLIS S5-GC75K-US?
- M
  Michelle JohnsonSep 12, 2025
  The OV-G-F error on your SOLIS Inverter indicates that the inverter detects the grid frequency as being too high. To troubleshoot, with the DC switch OFF, check the frequency at the inverter test points. If the frequency measures high, adjust the upper limit with permission from the utility. Also, check the LCD reading, as it may be a bad measurement circuit. With the DC switch ON, check the grid standard. If the issue persists, replace the inverter.
T
timothysmithSep 3, 2025
What to do if SOLIS S5-GC75K-US Inverter shows over DC bus voltage?
- J
  Jeffrey WestSep 3, 2025
  If the SOLIS Inverter shows over DC bus voltage, check the inverter inductor connection and the driver connection.
A
Audrey ClineSep 1, 2025
How to reduce DC voltage on SOLIS S5-GC75K-US?
- V
  vhenrySep 1, 2025
  If the SOLIS Inverter shows over DC voltage, reduce the number of modules in series.

SOLIS S5-GC75K-US Specifications

General

Model	S5-GC75K-US
Rated Power	75 kW
Max. DC Input Power	112.5 kW
Max. Input Voltage	1100 V
Start-up Voltage	200 V
MPPT Voltage Range	200-1000 V
Max. Input Current per MPPT	26 A
Number of DC Inputs per MPPT	2
Max. AC Apparent Power	82.5 kVA
Nominal AC Voltage	480 V
Nominal Grid Frequency	60 Hz
Power Factor	>0.99
THDi	<3%
DC Switch	Yes
Operating Temperature Range	-25°C to 60°C
Communication	RS485, Ethernet

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