Enphase M250 240V Micro Inverter M250-60-2LL-S22 by Enphase Energy

Last Fall I decided to have a professional PV grid tie system installed. After looking at several options I finally settled on a 9 panel ground mount array using Solar World 270 Watt Mono panels with Enphase M250 inverters. I based my decision on several factors: one is that if an inverter should fail, you only lose the output of one panel. Second is that the DC run is from the panel right to the inverter so there so no voltage drop. Third is all other wiring is 240VAC split phase, so again no power loss. Forth is the Envoy data collection. This allows you to have very detailed information on all of the power your system is producing.There were a few construction delays and the system went “live” on November 15. The system is rated at 2.25KW. Central Maine in Winter is not the best place to produce solar PV electricity, but I was so impressed that I decided to add three more panels this Summer as a DIY project. I purchased some gently used 305W Hanwha Solar Poly panels for a very good price and purchased three more Enphase M250 inverters. I was able to find all the needed Enphase cables and other hardware online. This last August my three DIY panels went “live” for an additional 750W.The inverters communicate to the Enphase Envoy date hub using the house wiring and the Envoy then sends the data to an Enphase Enlighten database over the internet. You can use your local LAN to hit the Envoy IP and access the Envoy web interface or you can set up an Enlighten account and access everything you would like to know about the health of your system.The only downside is the inverter does use about 9 watts to monitor the AC line even at night when the panels are not producing power. A negative review stated they draw 10 Amps, that is just wrong. The power the inverter consumes is insignificant to the total power produced. I have a whole house power monitor and I noted the night time power draw increased as more inverters were added.So, bottom line, is after 10 months there have been no problems and system has produced 2.75MWh. Total net kilowatt hour usage over the 10 months is under 300KWh and still dropping with each and every sunny day.May 2016 Update:Added two more panels last November, system is now at 3.5 KWatts. Also,added a yard light photo cell to control a 240V 20 Amp power relay on the solar panel feed line. When the sun goes down the relay picks and drops the power to the solar panel inverters. 9 Watts X 12 Hours dark (average) = .108 KWH X 365 Days = 39.4 KWH per panel X 14 panels = 552 KWH per year savings. When the sun comes up in the morning power to the inverters is restored.

Was not what we wanted for our panels.

I have a system with 17 of these micro inverters installed on my roof right now. The system produces the energy stated quite efficiently. I am pleased there.However as an Amateur Radio operator, I am frustrated at the RF interference generated and Enphase seems unwilling to admit how many others are reporting the same problems. I might need to resort to legal actions to get this fixed. This is amazing considering their claim of FCC Part B compliance. The interference happens at several frequencies in the 144 MHz frequency band and at a level making my radio useless on several frequencies while the sun is up.

When I first read of these they sounded like a do-it your self er dream all UL up to the point of termination no single point of failure 95% efficiency 25 year warranty all grate unless its BS, I only have a 21 panel system that I installed my self all done by code even installed a hole house surge protector, the first one failed about two years ago, called they verified the failure and they shipped a new one no problem, now a second one has failed and when you call its a recording stating something along the lines of if your not a pro they don't want to talk to you and then promptly hangs up, there's also an email system but after a week and two emails with no response, there seems to be a problem with the company heading in a downward direction, so if your buying based on 25 year clams and warranty Id keep looking.

So far so good with my 22 panel 275 watt Solar World Mono panels. In all honesty, I could have put 5 stars, but then again, my system is fairly new being only 3 months old. I am in Hawaii and chose these sealed micro inverters, as we have high humidity here and they can be a problem with vented string inverters. There is a drawback in that you cannot have it flip to batteries if your utility goes down. We have net metering, and when utility goes down, you don't produce for yourself during daylight hours. That being said, I researched, and where I live, electric power has not been off longer than 24 hours here in 18 years. I have a small generator if I need to make sure my refrigerator does not cause food to spoil. I am no longer a ham operator, so if the microinverters are causing some RFI, and I hear they do, it doesn't affect me. It is smart idea to have individual inverters and keep them shaded under panels IMO. Good luck

I have four of these on a small self designed PV system. They work like champs, and right from the beginning with no hassle. I did not buy the monitoring device. That seemed expensive for a small 1 kW system. And I was worried I might need to make some adjustments to get everything working. But in fact the factory values work just fine. These are so efficient that they barely get warm to the touch during max sun. The unique cabling system is clearly designed for bigger arrays than mine and is a bit overkill for me. But it all goes together quite nicely. I soon will have my connection approval (I am already connected) and net metering will commence. Already though my panels and inverters generate enough during the day to stop my meter from counting. When net metering is approved, it will be counting down a bit during the day. Very happy.

I dealt with Omar at TreePublic and I can't say enough. He's been truly outstanding. I'm 40 years old, and struggle to remember a time I've received better service. He has proven himself to be knowledgeable, responsive, honest, resourceful, kind... This review might sound too good to be true, but this honestly how I feel. And I can be difficult to please! So, I recommend Omar and Treepublic (I'm impressed by their operation - they are very well run) wholeheartedly.