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FIRE! Walmart Sues SolarCity/Tesla Over Rash of Solar Fires

08/26/19

  01:14:00 pm, by Jim Jenal - Founder & CEO   , 414 words  
Categories: Commercial Solar, Safety, Shortcut Solar

FIRE! Walmart Sues SolarCity/Tesla Over Rash of Solar Fires

On August 20th, Walmart sued Tesla Inc, alleging “widespread negligence” in the installation and maintenance of systems on something like 240 Walmart stores across the country, resulting in 7 fires!  Is this a uniquely SolarCity/Tesla problem?  Are rooftop solar installations invariably unsafe?  Or is there a design difference that can make systems safer, particularly for residential solar clients?  Here’s our take…

Fire at Walmart store allegedly caused by Tesla solar installation

Fire damage at Walmart store allegedly caused by Tesla solar installation.

The 114-page complaint is a pretty damning set of accusations, saying that the installations were rushed, that faulty materials were used during the installation, and that the maintenance provided by Tesla did not meet “Prudent Industry Practices."  For example, after one Tesla maintenance team left a Walmart site, a DC combiner box, which could involve DC voltages of as much as 1,000 volts, was found left with the cover off!

Other problems involved multiple solar modules with “hot spots” possibly caused by micro-fractures of the cells, as well as mismatching cabling connectors (connecting MC4 connectors to Amphenol connectors) such that excessive resistance in the connections could occur, resulting in overheating, and potentially fires.

While the lawsuit is specific to SolarCity, and its now parent, Tesla, the types of conditions described are going to be potentially present in any string inverter system - which all of these were.  Since you are dealing with strings of solar panels, you are dealing with higher string operating voltages, with more power running through those strings.  If you use mismatched connectors, or stand on solar modules (one of the best pictures in the complaint shows the foot of a Tesla maintenance inspector standing on a solar module!) you can have the potential for fires.

A Safer Way…

DC arcing at 240 volts

DC arc at 240 volts.
Video by John Ward
6:20 into the video.

Which leads us to yet another reason to prefer the Enphase microinverter approach - no high DC voltages involved!  When a DC circuit opens under load, it is possible to get significant arcing, like you see at the left - ouch! 

But since each solar module plugs directly into the Enphase microinverter, there is no additive effect leading to those crazy high DC voltages.  Open a DC circuit with a voltage of 40 volts or so and guess what? No arcing!

While human error is never going to be eliminated in the solar industry – those are human beings doing the work after all – the Enphase microinverter system is inherently safer.  And if you are going to put solar on your home, school or business, isn’t safer what you want?

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Jim Jenal is the Founder & CEO of Run on Sun, Pasadena's premier installer and integrator of top-of-the-line solar power installations.
Run on Sun also offers solar consulting services, working with consumers, utilities, and municipalities to help them make solar power affordable and reliable.

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