FAQs - Gateway
Do I need a system communication Gateway and an Internet connection?
Yes. Internet access should be provided for the Gateway to enable HiQ to supply firmware updates and to provide customer support functions.
How many inverters can be used with one Gateway?
The maximum number of inverters on each Gateway is 200, although local conditions might reduce that number.
How and where should I mount the Gateway?
The Gateway is rated for indoor installation only. Do not expose it to rain, extreme temperatures, or excessive dust. It must be mounted indoors. A utility closet or similar location physically close to the inverter system is ideal. It must be electrically connected to one of the three phases that are connected to the inverter. Note that in large utility closets it is often easy to end up on an unrelated AC circuit accidentally, in which case communications are unlikely to be successful.
Recommended for 480V TrueString: Add a 277 Vac outlet at the earliest entry point in the building to provide the best power line communication (PLC) signal possible. Ideally a 277 Vac outlet next to the breaker.
Recommended for 208V TrueString: Add a 120 Vac outlet at the earliest entry point in the building to provide the best power line communication (PLC) signal possible. Ideally a 120 Vac outlet next to the breaker.
Gateway should be protected by a 15A OCPD
A wired Ethernet network connection must be provided to the Gateway for proper data retrieval.
If outdoor placement is required, the Gateway must be housed in a weatherproof enclosure. Take care to ensure that the memory card is fully engaged, as the Gateway will not communicate properly without one.
What methods are available to communicate with TrueString inverters?
Beyond the usual monitoring portal information, data on system performance may be downloaded in three other ways:
How much data traffic does the HiQ system transfer?
A rough calculation for normal traffic can be made using the following:
Worst case is to assume longest summer day hours to calculate and give some extra padding to be sure you don’t hit any installation limits, such as might be imposed by cell modem plans for example.
Other possible data usage:
An example calculation for a system with 20 inverters is as follows:
How do I troubleshoot Gateway connectivity issues?
Recently added functionality on the Gateway gives greater insight during installation on possible issues. The 'Array Summary' screen has been updated with "indicator lights" showing the status of four critical elements. A green indicator means the following:
The PLC signal strength is low - what do I do?
Occasionally PV installs using TrueString inverters experience issues with the Power Line Communication (PLC) used to communicate between the inverters and the HiQ communication gateway. One reason for this can be that the nearby grid is sufficiently low impedance that the PLC signal ‘leaks away’ and has insufficient strength remaining for proper communication to occur. In this instance the PLC Cores provide a means of increasing grid impedance in the frequency band used by the HiQ system to ensure sufficient signal remains. External noise can be another source of issues.
HiQ Solar offers third party PLC Core common mode chokes as an ordering convenience. More information can be found in the PLC Core Guide.
Where did my 'Discover' button go?
A recent Gateway firmware update made improvements to the discovery functionality. The 'Discover' button has been promoted to having a screen all to itself - from the 'Inverters' page, press 'Setup'. This brings up a page dedicated to the discovery, addition and deletion of inverter serial numbers from a site locally.
Also included is a default discovery search that does not delete previous entries, only adds new units it finds to the existing site list. For a clean-sheet search the 'Add Only' check-box can be unchecked.