Solar Installers: SunWize is your trusted partner for reliable information that will help you to grow your business. Following are resources we hope you will find to be valuable: Tech Tips, Solar Engineering Bulletins, and a list of links to outside websites that we call the “Solar Installer’s Toolbox”.
Tech Tips
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PV Connectors - UL Compliance and Inter-Mating - How to use SunWize Adapter Kits
The market for PV connectors is becoming increasingly crowded. There are well over 30 different manufacturers of PV connectors on the market today. This article will outline the different connectors used by manufacturers that SunWize represents, provide details on which connectors are compatible, and discuss the requirements to maintain PV module and inverter listings when mating pairs of connectors. Read more...
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Transformerless Inverters: Benefits, Installation Differences and NEC Compliance
While transformerless (TL) inverters have been available for a number of years and are popular in the European market, they have lately become readily available in the US as they have come into compliance with US electrical standards. Until recently, solar electric systems were almost always designed using galvanic isolating devices (a transformer) between the DC and AC side of the inverter. Read more..
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Enphase M215 FAQs
In June, Enphase launched their new microinverter, the M215. The launch of this new product from Enphase has generated a lot of questions and SunWize wanted to take this opportunity to clarify the changes. Following is a list of frequently asked questions.Read more...
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Wiring and Configuring the D380 Enphase Energy Microinverters
There seems to be a degree of confusion relative to how to select and configure the wire harness for Enphase D380 systems. The D380 system uses an entirely different set of wiring harnesses compared to the M190/M210 family of inverters. This Tech Tip presents a basic explanation of how the D380 inverters are designed to be wired. Read more...
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Traditional PWM vs. MPPT Technology in Charge Controllers
This tech tip was contributed by Morningstar Corporation and explains the differences between advanced MPPT (Maximum Power Point Tracking) controllers compared to standard PWM (Pulse Width Modulation) controllers. There are several important differences between PWM and MPPT technology and unique advantages to each. These basic differences are outlined and an explanation is given on how to properly size solar arrays for each type of controller. Read more...
Solar Engineering Bulletins
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#7/11 Logistical Considerations and Solar System Design
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#6/11 Solar/Photovoltaic (PV) Array Sizing
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#5/11 SunWize Power Systems – Guidelines for Choosing the Right Product
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#4/11 Systems versus Components – Which Way to Go?
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#3/11 How Long Does It Take to Recharge Solar System Batteries?
