Badri Kothandaraman
President and Chief Executive Officer at Enphase Energy
Good afternoon, and thanks for joining us today to discuss our third quarter 2023 financial results. We reported quarterly revenue of $551.1 million, shipped approximately 3.9 million microinverters and 86 megawatt-hours of batteries and generated free cash flow of $122 million. Approximately 86% of our Q3 microinverter shipments were IQ8. We exited the third quarter at 48% gross margin, 18% operating expense, and 30% operating income, all as a percentage of revenue on a non-GAAP basis and including the IRA benefit. Mandy will go into our financials later in the call.
Let's now discuss how we are servicing customers. Our worldwide NPS was 77% in Q3 compared to 74% in Q2. Our NPS in North America was 78% compared to 77% in Q2. Our average call wait time was 1.3 minutes compared to 1.1 minutes in Q2. We made significant progress on root-cause fixes of some customer issues and expanded our field service teams globally.
Let's talk about operations. In general, the overall supply environment for microinverters and batteries, is quite stable right now. Let's cover microinverter specifically US manufacturing. We began manufacturing at Salcomp facility in Arlington, Texas during the third quarter. We shipped approximately 531,000 microinverters to customers in Q3 from our three contract manufacturers in the US; Flex in South Carolina, Foxconn in Wisconsin, and Salcomp in Texas. We expect to ship approximately one million microinverters to customers from our US manufacturing facilities in Q4.
Let's talk about batteries. For IQ batteries, we have two cell pack suppliers, both of which are in China. We have a manufacturing capacity of 300 megawatt-hours per quarter, positioning us well to ramp-up in 2024. We are looking at bringing manufacturing of IQ batteries into the US by the middle of 2024.
Let's now cover the regions. Our US and international revenue mix for Q3 was 64% and 36% respectively. In the US, our revenue decreased 16% sequentially, and 22% year-on year. The overall sell-through of our microinverters was down 12% in Q3 compared to Q2. On the other hand, the sell-through of our IQ batteries in the US was up by 34% in Q3 compared to Q2. In Europe, our revenue decreased 34% sequentially and increased 26% year-on year at healthy gross margin. The sell-through of our microinverters in Europe was also down 35% in Q3 compared to Q2. The sell-through of our IQ batteries in Europe was down by 14% in Q3 compared to Q2. We are now shipping IQ microinverters and batteries into many countries in Europe. We recently entered UK, Sweden, Denmark and Greece markets with both IQ8 microinverters and IQ batteries. Combined, these new markets represent more than 1.5 gigawatts of residential solar opportunity with countries like the UK, having a healthy battery attach rate of 30%.
I'll provide some brief commentary on Australia. Our revenue in Australia, more than doubled year-on year. We are quite pleased with the launch of our Enphase Energy System, it is state-of-the art followed by IQ8 microinverters plus our third-generation battery.
Let me comment on Rest of the World. In Brazil, we launched our IQ8P microinverters 480 watts AC, the highest power microinverters that we have. We also launched the Solargraf software platform and have good feedback from installers there. In addition, we started shipping both the 384 watts IQ8HC and the 480 watts IQ8P microinverters into India to support high-powered solar panels.
Let's now talk about Q4 guidance. We are guiding revenue for Q4 in the range of $300 million to $350 million. This reflects approximately a $150 million of channel inventory correction in the US and Europe. In other words, we are under shipping to the end market demand for our products by approximately $150 million. We anticipate under shipment will continue in Q1 and expect our channel inventory to normalize in Q2. Of course, we are conservative and are assuming the demand picture is unchanged from the current level.
So what has changed since 90 days ago, when we told you that the inventory levels would normalize by the end of Q3. We have seen a substantial demand reduction in Europe. We've also seen the US market continued to fall, driven by California. When the demand falls, we think more decisive inventory correction becomes necessary. We are being conservative in our assumptions of no demand recovery until Q2 in this framework. So that explains the guidance. Despite the large reduction in Q4 guidance, we are maintaining our non-GAAP gross margin above 40% in our guidance, without the IRA benefit. We aren't making any broad-based pricing changes at this time on microinverter, then we have already made the necessary changes on batteries before. Our pricing and operations team are doing an excellent job of managing, pricing and reducing costs.
Let's discuss the market trends. I'll give you a little more than usual color on markets. Let's split the US market by non-California states and California. For non-California states, the sell-through of our microinverters was 4% lesser in Q3 compared to Q2. We see this business starting to stabilize, given the weekly sell-through trends. In California, the sell-through of our microinverters was 25% lesser in Q3 compared to Q2 due to the NEM 3.0 transition. It will take a few more quarters for our installers to fully transition to NEM 3.0 and normalized sales to NEM 2.0 levels. Utility rates are continuing to move higher in California with one California utility recently requesting at 22% rate hike. Assuming that even half of that rate hike is approved by the CPUC, the payback period for an M3 solar plus a battery system will become close to a NEM 2.0 solar only system, so that's good.
Let me say a few words about US market share before I give more color on Europe. We see stable share today for our microinverters based on both internal as well as third-party data. Competition is not new for us. We have always relied on our differentiated technology with our distributed AC architecture, product quality and customer service to win share and we expect this to continue. We have many tools at our disposal, such as the installer services that we have bought, we made several acquisitions over time in the last couple of years, such as the software tool for design and proposal, the permitting tools, lead management, et-cetera. We have a lot of tools at our disposal to help our installers and our partnerships go a lot deeper in the downturn.
Let's talk about Europe demand a little bit. We are facing two challenges in Europe and the situation has dramatically changed from the last quarter, from 90 days ago. We saw a much weaker demand recovery from summer. We also see a lot of distributors facing oversupply of solar equipment, particularly panel is leading to much more aggressive destock. Despite this temporary weakness, we think that the pullback in Europe will be temporary as the fundamentals remain strong and we are relatively underpenetrated in the US, we are entering a lot, lots of new geographies with our IQ8 microinverters and batteries. So we remain very bullish about Europe.
Let me spend a few minutes discussing our three largest markets in Europe; the Netherlands, France and Germany in detail. In Netherlands, our largest European market, our Q3 sell-through was down 40% compared to Q2. This was our first sequentially down quarter in the last two years. In solar cell as that the customers fear of an export penalty and confusion around ending of the net metering has caused the market pullback. I was in Netherlands, two weeks ago, I visited with our leading installers. I came away confident that this pullback will be short LED [Phonetic]. We think that the plans for net metering will be clarified after the country's elections in November, the payback period are continuing to be attractive in Netherlands. In addition, total system solutions, which includes batteries, solar and EV chargers are going to become the norm, as dynamic tariffs become more prevalent in Netherlands. We are well-positioned to take advantage of these changes.
In France, our Q3 sell-through was down 34% compared to Q2, driven by seasonality. We see potential for this market to rebound very quickly. We're already seeing that as utility rates recently moved higher and are expected to increase even more in early 2024. In Germany, our Q3 sell-through was down 32% compared to Q2. We saw a strong sequential growth in installer count and activations, and we are continuing to gain traction there.
Let's talk about our new products, IQ batteries. Our sell-through for batteries has been steadily increasing over the last couple of quarters. We are at an inflection point for our battery business. With our IQ Battery 5P, we can deliver the best power specs and the best commissioning times of any Enphase battery till date at an industry-leading 15-year warranty and at the right price point. The battery adoption rates are on the rise globally. We are well-positioned to grow battery sales throughout 2024. And we are working on entering even more countries in Europe and Asia in the next few months with our IQ Battery 5P. In addition, we expect to introduce our fourth generation battery in the middle of 2024, that will have a much reduced form factor and the reduced cost structure. As previously discussed, we have entered many new markets with the IQ8 family of microinverters. We plan to enter many more new markets in Europe and Asia in the next several months.
Let's talk about our latest microinverter or residential segment in emerging markets. I didn't mentioned this before, this is IQ8P microinverter at highest power microinverter till-date 480 watts of AC power, that can support solar panels, up to 650 watts DC for Brazil, India, South Africa, Mexico, Spain and other emerging markets. We have started shipping the product into Brazil, South Africa and India in Q3, and are on-track to start shipping in Mexico and Spain in Q4.
The other variant of the IQ8 microinverter, IQ8P microinverter with the new three-phase cabling system is well-suited for small commercial solar installations, ranging from 20 kilowatts to 200 kilowatts. We are doing beta installations as we speak there and we expect to release the product this quarter into the US market. We are very bullish about the small commercial solar business where we believe we can add value to our business owners and installers with our quality and good customer experience.
Let's cover EV charging. We shipped over 3,500 chargers in Q3 compared to over 6,600 chargers in Q2. We launched our IQ Smart EV chargers in the US, just a few days ago, both US and Canada, actually. The IQ EV charger is Wi-Fi enabled, it includes smart control and smart monitoring capabilities. It seamlessly integrates into our solar and battery systems to help homeowners maximize savings, for example, by directly charging from solar energy-only that's current green charging. We are also working on developing IQ EV chargers for many countries in Europe, and we expect to introduce them in the middle of 2024.
Let's now discuss our installer platform briefly. Solargraf, our cloud-based design and proposal software platform now provides NEM 3.0 functionality for solar and battery systems in California. We are now offering 3D and shading features and continue to make progress on our new features and functions. The software platform is now available to installers in US, Germany, Austria, and Brazil. We expect to make this software release as part of our standard offering to any country that we enter.
Let me conclude. We are managing through a slowdown in our overall demand. In the US, it is due to high interest rates and NEM 3.0; in Europe it is due to broad macroeconomic conditions. Despite this, we are very bullish about our business long-term. We see several positive drivers that will accelerate adoption, such as the 30% ITC tax credit in the US, rising utility rates globally, increase grid instability also globally, climate change, and of course increasing EV adoption worldwide. We have no doubt that these will drive meaningful solar plus battery group. Our strategy is very clear. We manage for the long-term. We are doubling down on our relationships with our customers during these times. We are driving down installation times and investing in our customer service teams.
We are also strongly investing in innovation. We are working on IQ9 and IQ10, our next two generations of microinverters as well as the next two generations of batteries. We are also rapidly expanding worldwide with systems, comprising of IQ8 microinverters, IQ batteries, IQ EV chargers and home energy management software. We are introducing products for the small commercial and emerging residential solar markets, and we are making continuous enhancements to our installer platform, in addition to driving towards world-class costs on our products. We remain very positive about our future growth and profitability, and we'll continue to make best-in class home energy systems with a laser-focus on innovation, quality and customer experience.
With that, I will turn the call over to Mandy for her review of our financial results. Mandy?