STRCOM Fused String Combiners
Installation and Operation Manual
DOC-020040 rev 4.4
16
- You should see the open circuit voltage of the array drop to roughly 75-80% once the inverter
starts to load the array to MPP.
- Check the current level of each string when the system is operating. This can be done with a
clamp-on amp meter (DC). Assuming constant sun intensity is on all the strings, the current output
should be similar for each string, within 5-10%, for example.
To check for an open PV string:
With the inverter on and the PV system running (producing power), open the enclosure and probe
each fuse holder on the array side and other lead of meter on negative terminal block (neg.
grounded systems). If there has been a short in a string, the fuse for that string may be blown.
You will see this because that string will sit at open circuit voltage while all the other strings are at
MPP voltage.
WARNING:
The combiner should only be opened by qualified service technician.
WARNING:
If the combiner is outdoors, only open it when the weather is clear and
dry and the unit is dry.
To check for a weak PV string:
With the inverter on and the PV system running (producing power), Open the enclosure and probe
each PV string on the array side with a current clamp. If there is a weak string, you will see lower
current on that string. A dead string will show no current at all. Once you find what string has a
problem, you can dig into the wiring and modules for that string to find and fix the problem.
Ground Currents:
Check ground conductors for no current flowing while system is operating. Before closing the
enclosure always check for any signs of problems such as corrosion, loose parts, insect or animal
infestation, excessive dirt/dust or over heated or deformed/aged-looking parts. Also be sure if any
wires were moved or cable ties cut, that they are replaced as new.
4 Product Warranty & RMA Policy
4.1 Warranty Policy
The Solectria Renewables Warranty Policy is stated below.
Solectria Renewables Warranty Coverage:
Solectria Renewables Limited Warranties are provided by Solectria Renewables, LLC. ("Solectria Renewables") and
cover defects in workmanship and materials..
Duration of a Solectria Renewables Warranty Period:
The warranty period is 60 months from the date of purchase of the SRTCOM Fused String Combiners by the end user
or 64 months after the delivery date from Solectria Renewables to distributor or dealer/installer, whichever is shorter.
If a warranty extension has been purchased, the term is defined as extension beyond 60 months. For example, if a 5-
year extension (to 10 years total) is purchased, the term becomes 120 months from date of purchase.
If Solectria Renewables repairs or replaces a product, its warranty continues for the remaining portion of the original
Warranty Period or 90 days from the date of the return shipment to the customer, whichever is greater.
