Megawatt Systems: 3 Design Considerations

On the Megawatt Design discussion board, Ryan Mayfield answers student questions about designing systems. He discusses surge protection, tilted arrays, and “levelized cost of energy.”
Student 1: Do any of you specify surge or lightning-protective devices for your systems? Either on the DC or AC side of the inverter? Have any of you had cases where array equipment […]

Megawatt Design: 3 Obstacles You Might Face (…and 3 Solutions!)

Megawatt Design expert Ryan Mayfield addresses 3 obstacles that professionals in the field might experience.
STRUCTURAL ANALYSIS
Student 1: The most common obstacle we run in to is the structural requirement during the initial budgeting phase. Typically the potential customer does not want to pay for a structural analysis of a building roof or soil borings and engineering […]

Megawatt String Sizing Tool 2.0

Download Ryan Mayfield’s Megawatt String Sizing Tool 2.0 for free!
This is an updated version of the original Megawatt String Sizing Tool
This updated String Sizing tool includes a large re-work of the modules and inverters used in the existing database. There are significant updates in verifying inverter specifications and the interaction of multiple MPPTs in the inverters […]

Reassessing DC Voltage Drop Conventions

This article originally appeared in SolarPro Magazine in Issue 8.3.  | by Ryan Mayfield, Paul Gibbs and Paul Grana
“Ask almost anyone who works for a system integrator how to size PV system conductors with respect to voltage drop, and the nearly unanimous answer is “Keep voltage drop to less than 2%.” Typically, PV system designers […]

Ryan Mayfield on Megawatt Design Equipment and Software Selection

Happening on the Megawatt Design Discussion Board…
Expert Instructor Ryan Mayfield on three student questions regarding Megawatt Design equipment and software selection
1. String inverters & AFCI failures…

Student 1: I have seen many people staying with central inverters on big jobs mostly due to AFCI failures. I think the AFCI issues are being resolved, but it burned […]