Solar Builder

SEP-OCT 2017

Solar Builder focuses on the installation/construction of solar PV systems. We cover the latest PV technology (modules, mounting, inverters, storage, BOS) and equip installers/contractors with tips and tools to make informed purchasing decisions.

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54 S E P T E M B E R / O C TO B E R 2 0 1 7 W e've all heard the expres- sion "work smarter, not harder," but you would be surprised how often solar installers get in a truck and roll out to a job- site to adjust or repair something that probably could have been fixed remotely back at HQ. Many soft- ware-savvy solar installers are bon- ing up on best practices to better utilize the systems and information already available to them — most of it right at their fingertips — to save both time and money. For solar arrays, the most critical software typically lies within the power conversion devices, gateways and interconnected online monitor- ing platform provided by the inverter manufacturer. The online platform not only monitors the performance of the system, but also tracks a profusion of data points simultaneously and stores that information in the cloud. By check- ing certain performance specs, set- tings, activity and historical data, installers can quickly troubleshoot and fix common hitches or, at worst, narrow down the problem. Every inverter monitoring inter- face is a little different, but much of the information and tools available are typically the same. With an MLPE system like microinverters, you're able to drill down to the PV panel level to see what each module is producing at any given time. When troubleshooting a system issue, or when you see a panel reporting low or zero watts, first try rebooting the system remotely if your monitoring platform offers that capability. With some systems, a reboot may help the interface identify the issue, or it might reset the array to its default parameters in case an unusual grid event threw a monkey wrench at it. It could also spur the system to begin download- ing recent updates that may have stalled when the system encoun- tered the issue. You may even con- sider rebooting more than once. If you're still troubleshooting the issue, check the DC side of the sys- tem. For a microinverter system, be sure each inverter is reporting at its minimal operating range (such as 16 V ) incoming from the panel. Next, check your AC output. If your sys- tem shows it registering zero or 120 V, the inverter may not be sensing the grid or enough volts from the grid to register as a 240 V grid con- nection. Without an identified grid connection, the inverter will not convert energy, so if you see this as an issue with multiple sequential inverters, it could be a cable or con- nector problem. If it applies to the entire string or array, the problem could be a loose wire in the junction box or a tripped breaker. With a low wattage problem, you can drill down to the panel level online and check the voltage. If it's registering under its minimal oper- ating range, it's likely a panel prob- lem and not the inverter. You may still have to visit the site, but at least you know what you're replac- ing and exactly where it is on the array. At the site, unplug the sus- pect panel from the inverter and take a live load DC voltage and current reading. If your panel is reading below its minimum startup voltage and 0 current, then the panel is the culprit and needs replacing. Don't underestimate the value of historical data. Looking back over a system's history — especially that of a single panel — may help identify recurring issues affecting that par- ticular panel. Perhaps a chimney shadow hits the panel at the same time each day. You can look back through the production history to see if it occurs often, or if you have multiple installations in a particular area, you can check each of those to see how unusual grid activity may be aff ecting your other sites. Understanding what the site met- rics are telling you will give you bet- ter insight into what's happening at a jobsite. Learning what you can do to troubleshoot an issue online can not only save you a truck roll but also significantly reduce your time identifying the problem if you do have to drive to the site. Larry Busby is a technical services manager at APsystems. PV By Larr y Busby PV POINTERS Minimize truck rolls by using smart software "Don't underestimate the value of historical data. Looking back over a system's history may help identify recurring issues affecting that particular panel."

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