Thoughts on Solar

Last month during Intersolar, I (along with colleagues Sara and Victoria) was lucky enough to get invited to see a microgrid demonstration featuring the Enphase next-gen IQ8 at their headquarters in Petaluma, California.  As I had to sign an NDA as the price of admission, I was unable to write about what I had seen until today, when Enphase hosted their annual Analyst’s Day.  But I am no longer bound by that agreement, and can now tell you about what I saw. 

To say that I was impressed would be a gross understatement - quite simply, it was the most astonishing thing I have ever seen in the solar industry.  Settle in and let me tell you what I saw…

What Happens Today

Before I launch into describing the demo, let me remind you of what happens today.  All of the systems that we have installed are what is referred to as “grid-tied” which means that if the grid goes down, the PV system that is capable of back-feeding the grid also goes down, and remains down until the grid comes back.  (This is to prevent your house from being an island of energy, feeding the grid, and potentially injuring a worker trying to restore grid service.  As a result, this feature is known as “anti-islanding” and it is required of all inverter systems that are connected to the grid.)

Normally this is not a problem, but last month, when it got super hot out here (think 115° F hot!), both SCE and LADWP suffered dozens of outages, taking down PV systems across large swathes of LA County, and leaving frustrated PV owners without power, or A/C, just like their PV-less brethren.  Not good.

What I Saw in the Lab

Which brings us to what I saw at Enphase last month.

The lab looked like an ordinary industrial space, but with a series of household appliances and tools at one side.  There was a simulated array feeding a bank of IQ8 inverters, and a display that showed the output of the array (i.e., PV production), the total consumption from the loads, and any power being exported or imported to support those loads.  At the start of the demo the only load was a single red lamp, and the display indicated that it was drawing roughly 90 Watts.  The PV array was producing roughly 1.9 kWs, so the excess 1,800 Watts was being exported to the grid.  All super normal stuff.

But then things got interesting…

One of the engineers switched off the breaker that connected the PV array to the grid… and nothing happened!  Well, actually, a lot happened, but what didn’t happen was that the red light did not go off.  It didn’t even flicker to the extent that we could detect it.  But then when you looked at the display you noticed something amazing.  Not only had the microinverters created a grid on their own in fractions of a second, but they had throttled the output down so that now the production of the PV array exactly matched the load of the red light!  And here’s the kicker - there were no batteries attached to this system!!!

But what fun is just having a light on?  How about some toast?  So they switched on a toaster, and it lit up, and the total load jumped by about 1,000 Watts, making the total load now around 1.1 kW, and the PV array scaled up to meet it!  Still no batteries.  And how about this - there was no central controller, no master-slave relationship between the microinverters.  Rather, this was the “hive mind” at work, as the micros sensed the demand and scaled up or down as necessary to meet that load!

But wait, there’s more!

The next load to be added was a grinder like you might find on your workbench in the garage.  All by itself, that device drew roughly 1,200 Watts, bring our total load to roughly 2.3 kW - more than the maximum output of our simulated array.  What would happen when that was added to the mix?  Surprisingly little.  The grinder spun normally, but the red light dimmed slightly.  What was going on?  The system’s “hive mind” had lowered the voltage slightly (a microgrid equivalent of a brown out) to meet the amperage demand of the new load mix!  So slightly slower than normal, cooler than normal, dimmer than normal, but all operating.

Of course, all good things must come to an end.  Our already overloaded microgrid faced one more challenge - a vacuum cleaner with a significant in-rush current, far in excess of what the grid could sustain.  Indeed, as soon as they switched the vacuum cleaner to “on", everything shut off.  Nothing was damaged, the microinverters just shut off to protect themselves.

Turning on the vacuum cleaner served as the “ah-ha” moment for the potential homeowner - I guess I can’t run everything in grid outage mode.  So what do you do when something you just did produced an undesired result?  Well if you can, you undo it!  Turning the vacuum cleaner off, immediately restored the microgrid to its previous state of operation!  No delay.  No human intervention - just turn off that latest (over)load, and the system recovers on its own!

How cool is that?  Pretty damn cool, if you ask me!

Batteries Please?

So what about batteries, how do they play with this new system?  Just exactly as you would want.

The engineers added a bank of batteries to the mix, each with an IQ8 installed.  Now the display also indicated the battery’s overall state of charge, and whether they were charging or discharging.  Reset the demo to just the red light as a load and the batteries at 30% state of charge.  The PV array output jumped back to its maximum, with the surplus energy being used to charge the batteries.  As more loads were added, the PV array remained at maximum output, and as needed, drew power from the batteries.  Should the batteries reach full capacity and the PV output is greater than the loads, the microinverters will once again throttle down.

Sweet!

What’s Next?

I hope you agree that this was an amazing demo, and the IQ8 (or Ensemble, as Enphase refers to the overall system) has tremendous potential, both for Enphase as a company, and for so many nascent markets.  Think of how this product could have helped out in Puerto Rico, or in parts of Africa which have never, ever seen a grid!  Makes me want to book a trip to bring power to a village somewhere - hey Laurel, what do you say?

For our own clients, this has the potential to be the answer we have been seeking ever since Elon’s whoppers got people thinking about storage for the first time ever.

A point we raised with Enphase management is the need to have a reasonable upgrade path for existing clients.  Indeed, I have a call with Enphase tomorrow to discuss that very topic.  We know that current Enphase IQ products (the 6+ and 7+ we have been installing this year) will be compatible with Ensemble.  We expect to be able to work with older systems, though there may be a higher retrofit cost.  When we have that information, we will surely let you know!  The IQ8 is expected to be available in 1H2019… watch this space!

As Run on Sun rings in the new year and looks forward to a great 2017, we have some big news of changes taking place on our team. Our Projects Coordinator / Solar Ninja, Laurel, has moved to Oregon to spread the joys of solar power  in her home state. She wanted to share some final thoughts with her Run on Sun solar family…

Just over two years ago I made a flash decision that would change my career trajectory in a bigger way than I ever could have imagined. I came to Los Angeles after earning my Masters in Global Public Health. While I’ve always been passionate about solutions to environment and health, I hadn’t ever thought about working in the solar industry for perhaps obvious reasons (EVERYONE asks me how I started in solar with a public health background). After a few months living in LA without finding health work, I met someone at a green event who worked for a solar company. That encounter got me thinking about the fact that there is so much sun in Los Angeles but the air pollution is literally in your face every day. I realized that PV Solar provides an incredible opportunity to work towards something of real value for people, the environment, and for broader global health reducing the impacts of burning fossil fuels. So I took a chance and after doing a little research into who was working in my nearby vicinity (avoiding commuting in LA was a big priority) and who was doing solar for the right reasons… I contacted Jim Jenal at Run on Sun. I told Jim I was happy to schlep materials around the county, handle paperwork, answer phones, and do whatever it took to get more solar into our community if he would just teach me all about the industry. I didn’t realize quite how far that deal would go. You see, one of Jim’s past lives was as a high school teacher and despite the small size of his company he is considered one of the thought leaders in the solar industry, largely through this blog.

Over the next two years he taught me everything there is to know about running a solar installation company. Its not very often that one is given the opportunity to learn every aspect of an industry with an employer who gives you the confidence and tools you need to grow exponentially in a short period of time. I ate it all up! After a year I was wearing as many hats as one can imagine in a solar installation business… Inside Sales, Lead Developer, Site Assessor, Project Designer, Project Coordinator, Safety and Health Officer, Marketing Manager, Solar Blog Writer, Boom Lift Operator and of course Solar Installer. That’s when I made my own business cards with my new self-proclaimed title - “Solar Ninja". 

Working with Velvet, Ralph, Josh, Robert, and Jim on Run on Sun’s team was more empowering and satisfying than I ever imagined working in a for-profit field could be. I was helping people to reduce their impact on the environment, lower their costs, and show their neighbors that renewable energy is a real solution everyone can be a part of. I learned that, counter to popular belief, a sales person could be honest, forthright, and down to earth. I learned that we could run our business with integrity and give people quality 20+ year products they could trust. I learned that people who want to go solar are some of the coolest people and really makes sales work a joy. And more than anything else, I learned that I wanted to stay in this exciting industry that was growing and improving exponentially before my eyes. 

It was with the support of Jim Jenal and all the know-how he bestowed upon me that I was able to earn my PV Solar Technical Sales Professional certification through NABCEP. And I was offered an exciting position managing a new solar installation branch in Bend, Oregon for a forward-thinking solar company, Elemental Energy. Elemental even has a non-profit arm called Twende, installing off-grid systems in developing countries around the world! So this truly is a dream job combining my Global Health and Solar Ninja skills into one awesome adventure!  

I am sad to be saying goodbye both to the Run on Sun team and all the wonderful clients I worked with over my tenure which we fondly refer to as our Run on Sun family. Though the sun is setting on my time in Southern California, the sun is shining bright (everything is literally whitewashed with snow currently) in Bend! I look forward to hearing how things continue to grow with Run on Sun. If ever you or someone you know finds yourself with property that needs to be solarized in Central Oregon I’d love to hear from you! 

Thank you for reading my humble Thoughts on Solar! Much love and sunshine for all — Laurel