Don't buy this garbage. Firmware is full of bugs, power is unreliable, and support is horrible. Buy an MPPSolar from ebay instead.

This inverter was installed over a year ago by a professional solar installer who normally deals with high-end, far more expensive all-in-one units. This unit was selected because of the low cost and 240Vac was not needed. It works well. Much to my surprise, it even worked one winter day when the lithium battery BMS disconnected the battery from the inverter due to low-temperature safety cut-off. When the sun came out, the inverter still produced energy, and I was able to warm up the battery compartment with a 120V heater. Glad I saved $$$ by installing this instead of the $5000-$8000 versions.

Make sure you follow the directions and connect the green ground to the chassis like instructed. NOT THE TERMINAL FOR THE OUTPUT.

My system is for a off-grid cabin. Currently I have 6 320w panels and 4 100ah LifePo4 batteries.I feel like I will need to double both of those components. There's allot to like with the unit. It was relatively easy to install and get running. I have a generator hooked up that can charge as well but no auto start.The manual is not good enough for this type of product considering the difficulty of getting answers via technical support. I give the technical support credit for trying. They do respond but sometimes to a question I have not asked or they do not understand fully the question and give an answer that is not relevant given my entire statement. There is no phone support and 24 hours minimum for a response due to time difference, so resolving issues is excruciating.One weird issue I was having was that I was detecting small voltage on neutral and ground and my test device was going crazy anytime I even came close to any wire in the cabin (even with the breakers shut off). The previous owner had installed the circuit breaker box and wired for a generator, but had not grounded the system via a ground rod. Once I installed the ground rod that issue was resolved. I do not reside at the cabin continuously and I am currently dealing with an issue where the battery is apparently discharging itself overnight despite no appliances being on overnight. Once battery gets to a certain state, the inverter stops charging with error 03,04,29 The only way to get it charging again that I have found is to turn both switches off, disconnect the Batteries and the panels and then reconnect everything and turn unit back on. basically a full system hard reset. (this is where having disconnects on the components is critical). Fortunately my batteries have built in BMS to protect as a secondary protection. As stated previously there is a lot good with this unit but the interactions with tech support are frustrating I may have to purchase a different product.

(Updated as of 06/17/2022 and again 07/15 read the end for a full review and system recommendations.You will save yourself a headache if you read the updated end) I sat my panels out in the yard just standing up on a cloudy day, so not getting full power at all. I then plugged in my RV. Everything was operating straight off the panels until the dryer started running that put a huge drain on the supply and dropped the incoming voltage around 150 volts from what it showed with just the fridge, TV, and a standard 110V to 12V power converter running. But nothing shut down, nothing got hot, it quietly shifted to battery and solar and kept right on running. So far with just the test I see a few things I do not like one electrical and the others are all structural. First the electric input from my panels, I read 500V in the advertising but its only 450V and without a load the panels exceeded that but with one dropped to half that, I'm a bit worried about adding more voltage to make up the drop because with no load it'll really exceed that 450 it can handle. The first thing I don't like about the box is they recommend for DC in to use #2 wire to the batteries but send #4 wire ends with the device and #2 ends are little difficult to fit in. Second they recommend for AC #7 wire which is kinda rare to find in stock somewhere and I went with #6, the receiver for those is a little difficult to put #6 wire in but its possible so it would be nice if they're a little bigger. Number 3 is not having something to tie those heavy and or stiff wires to so they have a solid mounting connection before they are joined to the reciever. This would stop any chance of pulling them out during assembly. I would actually rather have had a conduit port so I could fully encase the wiring. But at least something to tie up to with a zip tie would make me feel the wiring is more secure. All in all it seems like a well made unit. I'll update this once I have the installation finished.1st UPDATE: Fully installed and running so here is the full review after a few days of use. The unit works well but somethings I would like different. The main problem is when you add power from a gen set or utility it doesn't use that power to charge the batteries at the same time as the solar panel input does. The first thing you need to know is you need around 170 volts 6.5A input from the panels just for the charger to work. Basically 7, 24 volt panels just to charge if they are putting out full power, thats with 0 volt draw down to the load. You will need a 400AH 48 volt battery bank to cover one full 24 hour day with no input and not harm the batteries. I only have 200AH and it never shows full battery power even after I charged them to full with an external battery charger. My system is for an RV and with 18 24 volt panels in series it isn't enough for a full load and full charge on a sunny day. If the 12,500 btu air conditioner is running before fully charging the batteries. Then when used as a heater at night, the 4 24 volt LiFePO4 200AH battery bank is used up before the morning. sun starts adding voltage back to the bank. So in conclusion you'll need at least 36 24 volt panels to have full power and full charging at the same time. Add to that a minimum of 400AH of 48 volt batteries or 8 24 volt to 400AH bank. We're using 4 24V 100AH LiFePO4 batteries in parallel then series as recommended to 200AH total and it isn't enough for a full 24 hours of no input. So in closing it has been working great but I was mislead by some of the answers to peoples questions. So if you want a complete setup using this Controller/Inverter you'll need at least 2 arrays in parallel sending 450 volts input each from the panels. Thats basically 36 24 volt maximum panels 18 in series per array, and equal to 400AH 48 volt battery bank to run a house with room to spare for one full day without input from the panels. One small thing if you want to charge the batteries when hooked to a power source (gen set or power pole) with out the bouncing between battery and input first you need to be set to Utility orSolUtil not Solar second switch the panel input breaker to off so there is no input from the panels at all. Hopefully you have installed a breaker between your panels and the unit. Using one of the panel array combiner boxes are a real good idea. They come complete with protection for the Charge Controller/Inverter and make adding arrays a breeze.07/15 We've been using this for a month and with a little adjustment our small setup is workable and we wake up to hot coffee every morning. We are fully off grid and as mentioned above my system is a little small. We have to wait until the batteries are recharged before we can add a load like AC/Heat. In Northern California where we live that's about 1 PM on a sunny day. Once we add more panels that time will drop or we can run the AC or Heat and charge batteries with more than 3 amps at the same time. All in all as a totally off grid setup it has worked pretty good. Though something is wrong when adding generator power once the machine hits a higher amperage on the charger it draws down on the generator like a huge load then resets and stops functioning for a little while then does it all over again. I'll update again once I know why. It looks like my problem is the unit needs a pure Sinewave from the power source being generator or Utility input. I haven't purchased the inverter generator yet to test it, i will update this again when I know more. One thing I can say after this first couple of months this unit really works hand in hand with the BMS in the batteries. When the batteries were charged in the first week or so a 200AH setup only charged to 195AH and I've read somewhere that that is within acceptable range so I didn't get too worked up over it. Now my batteries are at just about 204AH and it has been gaining a little more every day. That means the charge controller is doing a great job. Another thing is we never run short on power and can operate the microwave while the AC is running no problems. That is also while carrying the entire load from lighting, TV and refrigerator. We also can operate the dryer and AC at the same time. The switching between solar panel power to battery power is seamless. One thing we have learned is it is better to supply a lower voltage and higher amperage to the unit. We have 26 100watt 12V panels connected to the unit. Running enough of them in series to reach the 450V limit would charge the batteries by 1:30pm in June and running two lines in series as 225V strings at double the amps in late July charges the batteries around 1 hour earlier. The batteries will charge as the AC (or any other heavy draw load) is running. Under full sun, with lights, TV, and refrigerator, the standard load, we have around 30 amps charging batteries, and with a heavy load anywhere between 10 and 15 amps charging the batteries depending on what else is running. We are going to double finish adding panels so we have 450V 13 amps input max. That means even in winter we should have enough power to keep the cycle continuous. So we will always have enough juice to recharge and run the house load at long as we get 4 hours of sun a day. We are also adding at least 200AH more and I really think your in the right ballpark at 800AH storage. That would give us 3 days of autonomy with 0 sunlight. I am thinking of adding wind for the stormy dark days to charge batteries though I am little worried about that causing problems with this unit. My understanding is it can be done but the input from the wind power charge controller need to be fully opposite from the battery power out to this unit. That will send the charge from the wind thru the batteries first though I'm not sure why. I'll be figuring out how to do this safely. I really like this unit and we are very happy we chose one we have had so little issues with.

The first one I received did not turn on for some reason. Sent it back for replacement and the second one worked perfectly. It is set to charge batteries from solar only because not enough amperage available from grid to charge batteries and run load at the same time. It is currently running a cryptocurrency mine. Drawing 2kw constantly. Only have about 500 amp hours of battery but I am pretty sure it will run well with about 2000 amp hours of battery for my needs. I am very happy with this product.