APsystems (Altenergy Power System Inc.) makes microinverters, energy storage and rapid shutdown devices for solar PV systems; it names APsmart and APstorage as its brands and says it was founded in Silicon Valley in 2010.
Product / system scope unresolved. On the CEC list as certified to UL 1741 SB. California Energy Commission official workbook checked November 6, 2026 Pacific (November 7 UTC). Solar_Inverters row 169, DS3-LV {120V}. The Supplement SB Certification flag (column D) is Y and the certification group at O:P is populated. CEC labels this group third edition. Only the listed voltage configurations are covered by this observation. This is CEC-reported equipment evidence, not an issuer listing verification. No lab/file number, installation approval, regional transfer or complete-kit certification is established. Other maker claims and historical evidence remain separate.
Earlier dated CEC observation retained below; any certifying-entity/date wording in that observation is the earlier CEC report, not a new issuer check:
Listed on the California Energy Commission Grid Support Inverter Lists (data unchanged since October 1, 2026; downloaded October 11, 2026) as Altenergy Power System Inc. "DS3-LV {120V}": UL 1741 SB, certifying entity CSA Group, certificate date 2024-07-04. A state equipment list entry, not the certification body's own record.
Product / system scope unresolved. APsystems states “CSA Certified to UL3700 standards” on its EZ1 US consumer page and July 15, 2026 announcement, read November 6, 2026 Pacific (November 7 UTC). The consumer page explicitly identifies EZ1 as model EZ1-LV and says EZ1-LV is its only US EZ1 model. Manufacturer certification claim only in this row; no current issuer record was read, no edition or listing configuration established, and no certification is transferred to an assembled kit. The separate October 15 CSA file 259077 / class 5311-80 catalog record remains as that dated issuer snapshot; it is not renewed by this page read.
Product / system scope unresolved. CSA Group certification record, file 259077, class 5311-80 "POWER SUPPLIES - Interactive Plug-In PV Equipment and Systems (PIPV) - Certified to US Standards", listee ALTENERGY POWER SYSTEM INC. (APsystems), model EZ1-LV, read on October 15, 2026 (obtained by Alternative Research; csagroup.org challenges the standard research fetcher). The record names UL 3700 in its conditions ("Proprietary connectors shall be of the latching or locking type and comply with UL 6703 and the additional requirements of UL 3700 sec.6.4") but does not print a standard list in its header; the listing is recorded as found on that date, nothing more.
Product / system scope unresolved. Model DS3-H listed on the California Energy Commission Grid Support Inverter Lists (data unchanged since October 1, 2026; downloaded October 11, 2026) under Altenergy Power System Inc., as "DS3-H {240V}", grid support listing date 2022-01-11. This is an equipment listing, not UL certification or complete-system approval.
Product / system scope unresolved. Listed on the California Energy Commission Grid Support Inverter Lists (data unchanged since October 1, 2026; downloaded October 11, 2026) as Altenergy Power System Inc. "DS3-H {240V}": UL 1741 SB, certifying entity CSA Group, certificate date 2023-03-16. A state equipment list entry, not the certification body's own record.
Product / system scope unresolved. Listed on the California Energy Commission Grid Support Inverter Lists (data unchanged since October 1, 2026; downloaded October 11, 2026) as Altenergy Power System Inc. "DS3-H {240V}": UL 1741 SA, certifying entity CSA Group, certificate date 2021-12-03. A state equipment list entry, not the certification body's own record.
Product / system scope unresolved. Model DS3-LV listed on the California Energy Commission Grid Support Inverter Lists (data unchanged since October 1, 2026; downloaded October 11, 2026) under Altenergy Power System Inc., as "DS3-LV {120V}", grid support listing date 2024-10-11. This is an equipment listing, not UL certification or complete-system approval.
Product / system scope unresolved. Model EZ1-LV listed on the California Energy Commission Grid Support Inverter Lists (data unchanged since October 1, 2026; downloaded October 11, 2026) under Altenergy Power System Inc., as "EZ1-LV {120V}", grid support listing date 2024-10-11. This is an equipment listing, not UL certification or complete-system approval.
Product / system scope unresolved. Listed on the California Energy Commission Grid Support Inverter Lists (data unchanged since October 1, 2026; downloaded October 11, 2026) as Altenergy Power System Inc. "EZ1-LV {120V}": UL 1741 SB, certifying entity CSA Group, certificate date 2024-07-04. A state equipment list entry, not the certification body's own record.
Product / system scope unresolved. Model QS1 listed on the California Energy Commission Grid Support Inverter Lists (data unchanged since October 1, 2026; downloaded October 11, 2026) under Altenergy Power System Inc., as "QS1 {208V}", "QS1 {240V}", grid support listing date 2021-03-11. This is an equipment listing, not UL certification or complete-system approval.
Product / system scope unresolved. Listed on the California Energy Commission Grid Support Inverter Lists (data unchanged since October 1, 2026; downloaded October 11, 2026) as Altenergy Power System Inc. "QS1 {208V}": UL 1741 SA, certifying entity CSA Group, certificate date 2021-02-07. A state equipment list entry, not the certification body's own record.
Product / system scope unresolved. Model QS1200 listed on the California Energy Commission Grid Support Inverter Lists (data unchanged since October 1, 2026; downloaded October 11, 2026) under Altenergy Power System Inc., as "QS1200 {240V}", grid support listing date 2019-03-01. This is an equipment listing, not UL certification or complete-system approval.
Product / system scope unresolved. Listed on the California Energy Commission Grid Support Inverter Lists (data unchanged since October 1, 2026; downloaded October 11, 2026) as Altenergy Power System Inc. "QS1200 {240V}": UL 1741 SA, certifying entity CSA Group, certificate date 2019-01-28. A state equipment list entry, not the certification body's own record.
Product / system scope unresolved. Model QS1A listed on the California Energy Commission Grid Support Inverter Lists (data unchanged since October 1, 2026; downloaded October 11, 2026) under Altenergy Power System Inc., as "QS1A {240V}", grid support listing date 2021-08-23. This is an equipment listing, not UL certification or complete-system approval.
Product / system scope unresolved. Listed on the California Energy Commission Grid Support Inverter Lists (data unchanged since October 1, 2026; downloaded October 11, 2026) as Altenergy Power System Inc. "QS1A {240V}": UL 1741 SA, certifying entity CSA Group, certificate date 2021-07-02. A state equipment list entry, not the certification body's own record.
Product / system scope unresolved. Model QS2 listed on the California Energy Commission Grid Support Inverter Lists (data unchanged since October 1, 2026; downloaded October 11, 2026) under Altenergy Power System Inc., as "QS2 {208V}", "QS2 {240V}", grid support listing date 2025-11-03. This is an equipment listing, not UL certification or complete-system approval.
Product / system scope unresolved. Listed on the California Energy Commission Grid Support Inverter Lists (data unchanged since October 1, 2026; downloaded October 11, 2026) as Altenergy Power System Inc. "QS2 {208V}": UL 1741 SB, certifying entity CSA Group, certificate date 2025-09-04. A state equipment list entry, not the certification body's own record.
Product / system scope unresolved. Model QT2 listed on the California Energy Commission Grid Support Inverter Lists (data unchanged since October 1, 2026; downloaded October 11, 2026) under Altenergy Power System Inc., as "QT2 {208V}", "QT2 {480V}", grid support listing date 2022-10-03. This is an equipment listing, not UL certification or complete-system approval.
Product / system scope unresolved. Listed on the California Energy Commission Grid Support Inverter Lists (data unchanged since October 1, 2026; downloaded October 11, 2026) as Altenergy Power System Inc. "QT2 {208V}": UL 1741 SB, certifying entity CSA Group, certificate date 2023-03-30. A state equipment list entry, not the certification body's own record.
Product / system scope unresolved. Listed on the California Energy Commission Grid Support Inverter Lists (data unchanged since October 1, 2026; downloaded October 11, 2026) as Altenergy Power System Inc. "QT2 {208V}": UL 1741 SA, certifying entity CSA Group, certificate date 2023-03-30. A state equipment list entry, not the certification body's own record.
Product / system scope unresolved. Model YC600 listed on the California Energy Commission Grid Support Inverter Lists (data unchanged since October 1, 2026; downloaded October 11, 2026) under Altenergy Power System Inc., as "YC600 {240V}", grid support listing date 2018-03-01. This is an equipment listing, not UL certification or complete-system approval.
This manufacturer is listed as APsystems. Manufacturing entities, factories, cell origin and model-specific ownership relationships have not been audited.
Product certificates and company management certificates are tracked separately. No company management certificates have been reviewed for this manufacturer yet.
Using product as plug-in solar (i.e. balcony solar) system with 2, 400 watt solar panels. Setup instructions could be clearer but managed to get it operating in about 30 minutes of fiddling. What was not mentioned in the installation instructions was this: takes about 5-10 minutes to start functioning after initial setup. No problems so far. Great way to ease into solar power.
this balcony solar inverter was easy to set up. The app good. My only whine is I would like the monthly energy to match my billing cycle. I am quite pleased with the apparent build quality and instructions. Time will tell how it weathers. However I bought too early and paid $350. Then I ordered 2 ea 590 watt panels from amazon for about $1,000. I am lazy yes. Now I see the same configuration for sale for $899. It will only out put 926 watts per the app. The most I have seen is 750 ish watts. Again I am lazy and just laid the panels on the patio roof. We have wicked Santa Ana winds so an elevated/tilted panel must be secured properly.
I attached 4x240W Trina Solar panels, 2P per controller. I mounted these flat on a steel pergola using Unistrut. I may tilt these later but we get strong winds and going into winter I felt better just keeping them secure. I have been getting better than expected production considering the time of year. I've seen as much as 3KWh per day but 2.5KWh is closer to normal. Overall I have been very impressed with the microinverter. The unit is heavy and solid. I mounted it under my deck to keep it out of the weather. SO far no interruptions or unexpected behavior.
I love these. I bought my first EZ1 mid August, it was so easy to install and start producing power that I bought a second one a few weeks later. I found them for $280 per and attached them both up to 2 brand new Sun Spark 410w panels I found on FB Marketplace for $130 each. As the EZ1 says its good for 900w output, I thought the 410's would be good, and they are, but at only a typical 80% peak output, there is unused head room as I'm only seeing about 300-ish watts per panel for about 600w out of the 900 possible. So, for the two EZ1's running 4 panels for two and a half months, my total system output is just under 500kWh. The app is nice, and has been very stable. Super happy with this set up. I also installed the APM1 to shut the system down so it won't back feed.
I have been running mine for 3 months 24/7……explained at the end with copy/paste of my reply to the YouTube vid by Will.
I had issues at first due to plug in sequence and thought I bricked it. Turns out I had to let it sit 24 hours, then plug it in like the directions.
Will, I have an AP SYSTEMS EZ1-lv and have been running it for a FEW MONTHS 24/7. Yes, it runs all the time off my 5 server rack batteries and solar system. I bought 2 voltage converters 48v to 36v 15 amps and used that as the “Solar panels” just for safety so it couldn’t pull too much. I paired that with the AP system limiter so it never puts out more than demand by 20 watts…I set that due to my “location”. My peak power is about 880 watts. I figured all that wasted battery capacity in the winter in AZ, might as well use it at night. I can send you a pic of the setup.
In the graph is a lower typical day, I have 4 chest freezers so they cycle and you can see it on that one 120v leg of the main circuit breaker box that it’s feeding.
Purchased two units, running on a multi-wire branch circuit, so each unit supplies opposite split phase supply.
Paired each unit with a pair of Risen 435W bifacial TopCon panels. I’ve seen on regular days up to 1,200W combined output (I am under panelled, as panels are horizontal on top of a pergola. So they tend to max out at about 600W per inverter).
So far over a months they have been working flawlessly, output over the day matching my existing tesla system very closely. In shape of curve through he day. No complaints.
I haven’t had them long enough yet to give an honest reliability score. I have not had to reach out to customer service at all so can’t review that either.
Install was super simple, but I no longer use the cloud, I instead use them in local mode talking to home assistant, where I have implemented a zero export automation to prevent them from exporting to the grid.
great success, did call tech support twice and got super fast phone assistance.
Pro tip: use -25 with APMeter to get zero export to grid (see pictures)
check out my photo album of system photos https://photos.app.goo.gl/XUag9VDjpjSBUSDXA
stoped working after a month, no contact from tech support for a month
I bought this back in July, and it was working great up until the month. It took them about a month to get back to me to try to help me figure out what's wrong with it. In the end, they tried rebooting and reinstalling firmware, and they just said they were going to swap it out.
I told them I wanted a refund, and they refunded me my money, at least.
I purchased four devices from this company: two microinverters EZ1 and two limiters.
Why did I need two limiters? Because residential electrical systems in the United States use two 120V legs (split-phase power). Therefore, to connect the inverters properly, I needed two limiters.
Unfortunately, their equipment simply did not work properly. Their system would not allow me to register two limiters under a single account. Only one limiter could be registered.
The first microinverter I purchased worked perfectly, connected to the limiter without any problems, and then suddenly stopped working after just two and a half months. The only thing I had done during that time was turn off the power a couple of times for routine maintenance.
The second microinverter never worked with the limiter right out of the box. It displayed an error saying that the latest firmware needed to be installed. I downloaded and installed the latest firmware as instructed, but that did not solve the problem. This microinverter never worked with the limiter at all.
I contacted their technical support department. They told me they had checked everything and that the equipment should be working properly. They closed the support ticket without resolving anything. This happened more than once.
I contacted them again after the second microinverter also failed. They repeatedly asked me to record videos and provide additional evidence so they could investigate and test the equipment. I cooperated, but nothing ever came of it.
Do not waste your money!
They advertise a 12-year warranty, but based on my experience, that warranty is practically worthless. You might as well tear up the warranty paperwork and forget about it.
You would be better off buying a $100 Chinese microinverter. As long as you don’t overload it, it will probably work just fine — and in my experience, last longer than APsystems equipment.
This has been a very disappointing experience with both their products and their customer support. I would not recommend APsystems.
This plug in inverter is fairly simple to install, with one major caveat. Technically you can't legally mix connectors from different manufacturer's which are Staubli MC4 pattern. Doing so has caused many fires. So you should take care to ensure that you buy panels and extension leads which have matching connectors to the manufacturer and model on the inverter (mine came with genuine Staubli MC4 connectors). Otherwise, you should connect it to a 20A circuit if possible and ideally one with no major loads.
The mobile app is acceptable, it will limit output power to whatever peak wattage you set it to; but requires an external device to support metered zero export. This is an extra step above just plugging it in, and may be required in some jurisdictions. There's no desktop app or web browser access, but community members have come up with ways of connecting it to home assistant.
I haven't had any problems with clipping with 2x 450W panels connected to it, and it has produced 728kWh in the 8 months since commissioning; with a peak production wattage of 824W.
I started working with solar when I built my home in 1999. I have had multiple types of inverters and panels. I currently have 10 of the AP systems DS three micro inverters and they work well.
I bought EZ-1 solely for the purpose of showing others how groundbreaking this can be. The unit failed within one month of installation and after multiple attempts by AP systems to fix the unit remotely they still have not agreed to send me an RMA. The last straw for me was when I was going out to once again put the unit online for them. I slipped and fell and decided at that moment it just wasn’t worth it. I am 67 years old.
The unit is sitting on the floor of my garage and AP systems has offered no remedy once I informed them that I will no longer keep it online. Please keep in mind. This was three months total without an offer of an RMA. So needless to say I cannot in good faith recommend buying this unit.
The truly sad part is my other inverters which are 208 V have been running for four years without issue. As a matter of fact, I recently had one fail. I contacted AP systems and after a brief back-and-forth, they sent me an RMA and a replacement with no problem.
I cannot for the life of me figure out why with a new product on the line, they would give me such bad customer service for the. EZ-1.
That’s my story.
