Category: Residential Solar

05/24/17

  06:58:00 am, by Jim Jenal - Founder & CEO   , 230 words  
Categories: Commercial Solar, Residential Solar, Non-profit solar

Support KPCC and Save on Solar with Run on Sun!

KPCCHere at Run on Sun we are big NPR fans, and particularly our own, Pasadena-based affiliate, KPCC.  Great local programming, as well as all those wonderful NPR shows that we live for!  (And hey, Kai Ryssdal, we are still waiting to do that interview on the business of solar!)

But between  now and the end of May, KPCC is having their annual Online Auction with over 500 cool things to bid on!  Well, we believe that Run on Sun is Pasadena Solar, so of course we had to get in on the action with not one, but two items for a lucky listener!  Check these out!

Residential Solar

For one lucky listener, Run on Sun will give you $500 off on your residential solar installation!  The bidding starts at $150, so you have a shot at tripling your money, all the while helping to make your local NPR affiliate that much stronger!  Bid on your Residential Solar Discount here!

Commercial/Non-Profit Solar

For that commercial facility or non-profit considering solar, have we got a deal for you!  $1,000 off your commercial/non-profit solar installation, 20 kW or larger.  (New client contacts, only.)  Bidding starts at $300, so again, you could end up tripling your money, and provide a big boost to KPCC.  Bid on your Commercial/Non-Profit Solar Discount here!

But you have to ask fast - the auction closes May 31 at 7:00 p.m. - so don’t miss out, start bidding now!

05/04/17

  05:11:00 pm, by Jim Jenal - Founder & CEO   , 497 words  
Categories: All About Solar Power, Solar Economics, SCE, Residential Solar, Ranting, Net Metering

NEM 2.0 is Coming - But Not Before July 1

As a solar installer working in SCE’s territory, we get messages from them on a regular basis, including those regarding the upcoming transition to NEM 2.0.  But the email we received today (actually two copies of it!) was a bit, how shall we say, high-strung?  Here’s our take.

NEM 2.0 will occur when the first of two events occurs: SCE interconnects enough residential and commercial solar projects to reach 5.0% of its total aggregate power demand, or July 1.  We have written before that SCE will never get to the 5% beforehand, so the deadline is 23:59:59 on June 30. 

So we were a tad perplexed to see this email today - here’s a sample:

417 MWs Remaining in NEM 1.0

As SCE gets closer to its Net Energy Metering (NEM) 1.0 Cap, we want to remind everyone of the importance of submitting complete and accurate interconnection request(s) (IRs). You should be receiving similar notifications within the online application system (i.e., PowerClerk).

Why is the 417 MWs remaining important?

For those applicants and customers with an existing IR moving through the interconnection process, we are sharing this information so that you may plan accordingly as SCE approaches its NEM 1.0 Cap. Once the cap is reached, the existing NEM tariff will close to new customers and the NEM 2.0 (NEM Successor) tariff will become available. With approximately 417 MWs remaining in the NEM 1.0 cap, this is a friendly reminder to please submit all documentation necessary for receiving service under NEM 1.0 and do so as soon as possible.

(Emphasis in the original.)

Wow - you would think that this might happen any day now, based on that language.  Except that it won’t - not even close.

Here are the underlying numbers:  SCE’s total cap is 2,240 MWs - a target it has been building toward since 2007!  As of today, in SCE’s territory, 1,823 MWs has been installed.  That means it has taken roughly  3,595 days to install that capacity, which works out to roughly half a Megawatt per day.  With 417 MWs left under the cap, and just under 58 days before July 1, we would have to be installing at the rate of 7.2 MWs/day!  Uh, no.  Just Not Going To Happen!

(If you would like to see exactly how much time we have before we hit the actual deadline, check out the Doomsday Clock on our Residential Solar page.)

However, the reality of that deadline does have consequences.  For potential commercial clients, sorry, but you are out of luck - there is just not enough time to get a new commercial project designed, permitted, constructed, and approved before July 1.

Potential residential clients are in a slightly better position, but only slightly as your window of opportunity is rapidly closing.  For example, we are already booked solid for the entire month of May with just SCE projects (we have pushed everyone else back to try and help as many as possible in SCE territory meet the deadline), and we can only guarantee an approved interconnection for NEM 1.0 by mid-June.  If you’ve been thinking about solar in SCE-land, please don’t wait, call or email us today!

03/28/17

  03:22:00 pm, by Jim Jenal - Founder & CEO   , 1002 words  
Categories: Solar Economics, Residential Solar, Energy Storage

Solar + Storage = $avings!

We have been waiting a long time for this moment, when we could finally say that we can offer a solar plus smart storage solution for our residential clients.  Well the wait is over, and if you act fast, there is even a sweet rebate available!  It is a complicated picture, so stick with us as we break this down.

Introducing the Enphase Energy AC Battery

Four Enphase Energy AC batteries installed

Four Enphase Energy AC Batteries

Regular readers of this blog know that we are big fans of Enphase Energy and have been installing their microinverters for years.  Given our history with the company, we were excited to be approached by Enphase to participate in their AC Battery “beta” install program, one of just a handful of selected installers in the U.S.  We selected the site of one of our largest residential projects for the beta, knowing that would give us great data to study over time (and you know how we love data!).  We really like the way the install turned out, nice and neat!

Let’s be clear about what this system is, and is not.  It is not a battery backup system.  It will not keep the lights on if the grid goes down.  It is an energy arbitrage system - it stores energy from your PV array for use later in the day when your rates are highest.  That means that this system isn’t for everyone; it is for folks who have a PV system (or want to install one!) and are subject to time-of-use (TOU) rates, which mostly means just some folks who are SCE customers.  (Important note to SCE customers - if you install solar after July 1st, you will be forced onto time-of-use rates.)

Each battery stores 1.2 kWh of energy and can discharge that energy at 280 Watts, giving a discharge time of 4.3 hours.  The beta install shown above is a total of 4.8 kWh and a discharge of 1.12 kW.

So how does this work? Consider SCE’s TOU rates - the cheapest energy (13.1¢/kWh) is from 10 p.m. to 8 a.m.  The next cheapest energy (16.6¢/kWh) is from 8 a.m. to 2 p.m., and 8 p.m. to 10 p.m.   The really expensive energy (a whopping 33.5¢/kWh!) is from 2 p.m. to 8 p.m. - precisely when most people are coming home from work or school, turning on the A/C, and lights, and the TV and on and on.  Ouch! 

But note that the peak time does not coincide well with the output from the PV array, meaning energy exported onto the grid during the day is worth half of what that same energy would be worth later in the day.

That problem is exactly what the Enphase AC Battery is designed to solve.  Each morning when the PV array “wakes up” it starts to power the local loads of the house.  As the system produces more power, excess power is routed to charging the batteries (instead of exporting onto the grid).  Once the batteries are fully charged, any excess power is then exported and the homeowner gets a net metering credit for that energy.  But now when we get to 2 p.m. and the energy rate kicks into high gear, any energy needs that cannot be met by the PV array is supplied by the energy stored in the batteries, thereby limiting the amount of really expensive energy that has to be purchased from the grid.

Here’s a recent day’s performance of the beta system (I told you the data was cool!):

Enphase AC Battery usage

The bright blue is energy from the array, the orange represents energy loads - pale orange is entirely offset, bright orange is drawn from the grid.  The green at the bottom shows the percentage of battery charge - sloping up between 8 a.m. and noon, constant until needed starting around 6 p.m., and then discharging to offset the household loads. 

At the top we see snapshot data from the 8-8:15 p.m. interval.  No power is available from the array (duh, it’s night!), but the house is consuming 533 Watt-hours of energy, with slightly more than half coming from the batteries.  (Hint - the system is entirely modular, so we could easily double the size of the system to completely cover those loads.)

Bottom line: if you are on a TOU rate, storage can really improve the value of your existing PV system.  (And because the Enphase storage system is “AC-coupled” it can be installed with any existing PV system!)

The SGIP Rebate Program

Which brings us to the Self Generation Incentive Program (SGIP) rebates.  Starting in April, rebate applications can be submitted for energy storage systems.  Much as the CSI rebate program had multiple steps over time, SGIP has five incentive level steps and how fast it steps down is tied to how large is the demand for rebates.  (We anticipate that the highest rebate level will be paid out almost immediately after the program formally opens on May 1.)  At this highest rebate level we would expect the rebate for each Enphase AC Battery to be roughly $430.

The competition for these rebates will be pretty fierce.  Fortunately, there is a dedicated carve-out of money for small residential storage systems, so all the money won’t be gobbled up by a few, super-large projects.  (Interestingly, priority will be given to folks living in what is known as the Western LA Basin Local Reliability Area - you can check to see if your zip code, which includes pretty much all of the Run on Sun service territory - is included by clicking here.)

The rebate is not limited to SCE customers; folks who are SoCal Gas customers (that means you, PWP and LADWP folks!) can also participate.

Go with the Pros!

Properly sizing a battery system to go with your solar array is a complicated process that requires technical savvy.  Dealing with the SGIP bureaucracy requires a sophisticated team that can deal with the program’s many twists and turns.  If adding storage - specifically the Enphase AC Battery - to your present or planned PV system sounds like a good idea, give us call, we’re ready to bring our expertise to bear to help you get this right!

02/20/17

  12:30:00 pm, by Jim Jenal - Founder & CEO   , 814 words  
Categories: Solar Economics, Residential Solar, Net Metering

Update: Net Metering 2.0 Coming Soon!

We have written at some length about how Net Energy Metering (NEM) works, and about the changes to NEM that are coming, aka Net Energy Metering 2.0.  While both PG&E and SDG&E have already switched to the 2.0 version, SCE customers are still able to go solar under the existing, more favorable, rules, but not for long!  (NB: PWP & LADWP customers are unaffected by this change, the following is only relevant to SCE customers.)

Here is our update as we dive headlong into the brave new world of NEM 2.0.

Timing of the change

Under the rules adopted by the California Public Utilities Commission (CPUC), SCE must continue to allow new customers to operate under the current NEM 1.0 rules, until either of the following events occur:

  1. SCE reaches its NEM 1.0 cap of 5% of net aggregate demand, or
  2. We reach the deadline date of July 1, 2017.

As of this writing, SCE is still a full percentage point below its cap, with 480 MW worth of solar to install before the cap is reached.  Quite simply, that will not happen between now and the end of June, so the deadline to get in on the current rules is 11:59 p.m. on June 30, 2017.

But here is the rub—to qualify, not only must the project have been completed, but a final, signed-off inspection card must also be submitted to SCE prior to the deadline.  This is going to make June a difficult month as installers struggle to get projects completed and approved in time.  Since approvals are at the whim of individual inspectors, many of whom are idiosyncratic (to be kind) in their understanding of what the code requires, it is difficult to guarantee that a project will be approved on first inspection. 
Prudent consumers will want to make sure that first inspection occurs on or before June 15th.

Key differences

Although NEM 2.0 is not the crushing blow to solar that some feared it might become, it still has a number of aspects that make it less appealing to the solar system owner.  Here are the major differences:

  1. New Interconnection Fee—Presently, it doesn’t cost anything to connect to SCE’s grid.  NEM 2.0 changes that, and imposes a one-time charge of $75.
  2. Imposition of Nonbypassable Charges (NBCs)—under existing rules, if the credits generated by exporting power to the grid equal or exceed the charges incurred for energy imported, the energy charges are zeroed out (or even a credit is carried forward, if exports exceeded imports).  Under NEM 2.0, for every kWh imported from the grid, whether it can be netted out or not, there are NBCs charged for that energy.  The good news is that this is just about 2.2¢/kWh, and it does not apply to solar energy consumed locally, but it does still decrease the savings from solar.
  3. Mandatory Time-of-Use (TOU) Rates—Presently, residential customers who are on an SCE tiered rate before adding solar remain on that rate after interconnection.  NEM 2.0 changes that as well, and forces new solar customers to shift to a TOU rate.  SCE’s TOU rate charges the most for energy consumed from 2:00 to 8:00 p.m., meaning that energy exported to the grid  before 2:00 (as many solar systems do) is less valuable to the consumer than the energy they have to import from the grid in the evening after the solar system is no longer producing.

(Unintended?) Consequences of NEM 2.0

The coming of NEM 2.0 has some obvious consequences—there will be a crush this spring to get projects approved before the new rules take effect (so don’t wait!), and the overall savings from going solar will be reduced, although not dramatically so.

Enphase AC BatteryBut there are some unintended consequences as well.  For one, these new rules will be a boon for intelligent storage systems, both to help reduce NBCs and to shift that otherwise exported energy to peak TOU periods.  Storage systems with the “smarts” to do all that will suddenly make economic sense.  (More on that in the near future, but for now just three little words: Enphase AC Battery!)

Another unintended consequence is the significantly increased difficulty in properly modeling the savings to be derived from adding solar.  While some installation companies use sophisticated software like EnergyToolbase (as Run on Sun does), or build out sufficiently detailed spreadsheet models (as Run on Sun also does), for many, that level of complexity is simply overwhelming.  So what will they do?  More than likely, just create a number that is little more than a WAG (and no, not a SWAG).

The result is that potential solar clients need to push on companies providing them with solar quotes to justify their savings numbers.  If they used something like EnergyToolbase they should be happy to point that out (although there is still the risk that they used it incorrectly…).  If they used their own proprietary model, they should be able to explain how it works.  But be wary of numbers, especially outliers that claim greater savings without sufficient documentation.

02/17/17

  09:46:00 am, by Jim Jenal - Founder & CEO   , 2125 words  
Categories: Solar Economics, Residential Solar

I've got solar; why is my bill so high?

Shocking electric billsEvery now and then we get a call from someone who has solar installed at their home but they’re not happy.  Typically this occurs when they get their “true-up” bill at the end of the year, and are shocked to see that the amount that they owe is way more than they expected!  In many cases this leads them to believe that the system simply isn’t working, and now they want a third-party (like Run on Sun) to come out and evaluate the performance of their system. 

Here are the three leading reasons why that bill is so high…

Your system just isn’t working!

Although this tends to be the number one suspected reason for why the bill is so high, generally it isn’t the actual cause.  Most systems are installed properly and are in operation.  But every now and then we come across a system that simply isn’t working at all.  That was the case with one man who was convinced that his system had never worked and that the company that installed it was simply out to cheat him.  We didn’t see signs of that—the system had been installed and the overall workmanship was acceptable on the surface, so it wasn’t like someone just slapped the panels on the roof and ran away.  But here’s the thing—this was an Enphase system so there should have been monitoring in place to answer the question of how well the system was working.  Except that the installer had never bothered to complete the setup of the monitoring system!

When we came out we were able to access the Envoy directly, and while it could see the microinverters, it was clear that they had never produced any power—in over a year!

So how can a solar system owner prevent this?  Simple—when your system goes live, make sure that the installer walks you through the operation of the system so that you can see with your own two eyes that the system is actually producing power.  (This could be a readout on the inverter/monitoring system, or a spinning performance meter, or an indication that utility meter is going backwards.)  Better yet, ask them up-front how will you be able to know that your system is working, and then when it goes live, make them prove it to you!

Your system is working, but…

This second case is actually far more likely: the system is performing, but it is not meeting your savings expectations.  In our experience there are two main reasons for this: hype and over use.

Beware the hype

One reason for this disconnect is that a dishonest sales person over-hyped the savings to be had from the system installed.  For example, we have seen “savings” projections based just on the size of the system, without regard for how shaded the system was, or its orientation - to say nothing of the actual rate structure that is being used by the utility. 

Shaded systems produce less energy.  Systems aligned away from South will produce less energy.  A utility customer on a time-of-use rate structure may well save less than one on a tiered rate structure (depending on how those rates are designed).

The point is to beware of overly simplistic savings projections.  A proper analysis will factor in all of these issues to provide the best possible estimate of savings.

Solar is not a silver bullet

Even the best savings projection is predicated on future energy usage being consistent with the historical data that the solar company was given (unless increases are specifically discussed and included).  While many people with solar power systems become vigilant about reducing their overall energy consumption, others go in exactly the opposite direction.  Indeed, it is not uncommon to hear people say that part of why they want to “go solar” is so they can afford to run their air conditioning “more” during the summer. 

Solar power systems are finite resources—they can only produce so much energy consistent with the size of the system, and most utilities limit system size to the historical energy usage average at the site.  If you install solar, but then triple how much energy you use during the year, you shouldn’t be surprised if you are not saving any money!

What we have here is a failure to communicate!

Which leads us to the most likely culprit—there has been a failure to communicate between installer and consumer.  At the root of this is Net Metering and the complexities of most energy bills.  (A big part of the blame here goes to the utilities who seem determined to make their bills as complicated as possible!)  Let’s provide an overview of this issue and then illustrate with a specific example.

How Net Metering Works

Solar system owners - at least here in SoCal - operate under utility rules known as Net Energy Metering, or just Net Metering for short.  Here is how this works: on the day when your solar power system is given “Permission to Operate” (or PTO) by the utility, your billing will shift to Net Metering (often the utility will change your meter to allow for that switch).  Every day, as your system operates, you will either be exporting (selling) energy back onto the grid, or importing (purchasing) energy from the grid. 

Think of it this way: you get up at 6 a.m. and it’s dark outside.  You turn on some lights, the radio, coffee maker, etc.  Your solar system isn’t producing anything (it’s dark outside, remember?) so you are purchasing energy from the grid.  You go off to work as the sun comes up, and your system turns on.  All day long, your solar system is producing energy, but there is no one there to use it—the A/C is off, the TV is off, the house is dark—so all of that excess energy is sold back to the utility.  Your fancy new meter keeps track of all of that energy coming and going.

Every billing cycle the utility will look at those readings—how much energy did you sell compared to how much did you purchase—and “net” out the difference.  If you were a net seller of energy, you will have a credit.  If you were a net purchaser of energy you will have a balance due.  But here is where some people get confused—your bill won’t ask you to pay for the energy you used that month.  Typically you  will only be charged for whatever “customer charge” there may be along with taxes and other fees.  The bill for your energy usage (or credit, if you are so lucky) is carried forward to the next billing cycle, and the next, and the next, until you get to the anniversary of your PTO date.  Now your usage will be “trued up” and you will either get a bill to pay (assuming that for the year you were a net energy purchaser) or a check (assuming you were a net energy seller, but don’t get too excited because that payment is really tiny).

Here’s the thing, depending on how much of a net energy purchaser you were, that bill could be pretty significant, in some cases well over a thousand dollars or more!

Of course, you would have been receiving bills every cycle that showed what you were accumulating (either a balance due or a credit) but since there is no related payment required, it is easy for some to overlook those bills, and if this process has never been explained—or even if it was but the consumer simply didn’t “get it” at the time—this can lead to a nasty surprise.

Bottom line - solar companies need to do a better job here in explaining how this works.  (Hence this post!)

A real-life example

Consider a hypothetical solar system owner, let’s call him Bob.  Now Bob is a smart guy, but this is the first solar power system he has ever owned.  His installer explained everything to him when the system went live, but Bob was distracted by the excitement of a potentially zero bill.  His system has Enphase microinverters so he has been receiving energy production emails from Enphase every month, and that looked cool, but he never attempted to reconcile his Enphase report with his utility bill (Bob’s not so big on balancing his checkbook, either).  But to be fair to Bob, the Enphase report that he receives is for each calendar month, but his billing is every two months, and they aren’t calendar months; rather, they run from meter read date to meter read date (e.g., 7/28/2016 to 9/26/2016).

The good news is that Enphase has a reporting feature that allows you to enter any two dates since the system went live and receive day-by-day energy production, with the total at the end.  Let’s see what we can learn when we put Bob’s billing data next to his production data from the Enphase reporting feature:

Usage versus production data

Ten months of Bob’s usage versus production

The first two columns show the start and end dates for each meter reading/billing cycle.  The bought column is the amount of energy that Bob purchased from his utility.  (Whoa, what happened during the latest billing cycle???)  The sold column is the amount of energy that Bob sold back to his utility during that period, as reported by the utility.  The next column is the amount of energy that Bob’s system produced during the dates in the billing cycle, according to the Enphase website.  But wait, how can this be?  In that first period, the utility says that Bob only sold 774 kWh of energy, but Enphase says his system produced nearly twice as much, 1,338 kWh!

How do we make sense of this disparity?  The answer is simple: local consumption.  It is important to remember that the utility has no idea how much energy Bob’s system is producing, all they see is how much energy Bob is selling back to them.  So both Enphase and the utility are correct, they are just measuring different things.  Enphase measures total energy produced.  The utility measures energy sold to them—the difference is energy used to power Bob’s house that didn’t come from the utility; rather, it came from the solar system!  In that first billing cycle, Bob’s system produced 1,338 kWh and of that, 774 kWh were sold back to the utility, meaning 564 kWh of that production were used to power his house.  And that means that Bob’s total consumption for the month is the amount that he bought from his utility, 1,402 kWh, plus the solar production that was consumed locally, 564 kWh, for a total consumption of 1,966 kWh.  Applying that reasoning to the rest of the data shows that Bob’s overall consumption has increased in every billing cycle except one, with a whopper over the holidays!  (Maybe too many holiday lights?)

The production data shows that Bob’s system has been performing appropriately - increasing over the summer months, decreasing over the winter months.  Here’s a graph that puts that all into perspective:

Bob's usage versus production

Bob’s solar power system: Lifetime energy production versus expected.

The blue represents the actual energy produced each day.  The gray line is the predicted system production (in this case modeled using the CSI calculator). Over the lifetime of the system, the maximum amount of energy produced in a day was 29.7 kWh (42% above what was predicted for that day) and on the day when this graph was created, the system produced 15.7 kWh.

Generally, the performance peaks well above what is expected (particularly in the late June through early November period).  But once we get into mid-November things deteriorate—not because of a fault in the system, but because of abnormally wet weather here in SoCal (as we head into a 1″/hour rain storm today!).  For much of the past two months, actual production has fallen well below what was predicted, with just 77% of predicted being realized so far this month.  And yet, despite all of that, overall the system has still produced 99% of its estimated lifetime production.

This points out a couple of key things to me: First, you just gotta love the data that is available through the Enphase monitoring system.  It allows system owners and installers alike to have near-real time access to system performance, as well as to review long-term data to discern trends and uncover patterns.  Priceless!

Second, we as solar professionals need to do a much better job of informing our clients so that they know what to expect.  (I’m leaving out the hype-sters who couldn’t care less what the consumer knows as long as they make a sale.) 

We live with this stuff every day but for most of our clients, this is all brand new, and confusing.  We need to take the time to explain how this works so that they can understand the actual value of their investment.

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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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