PowMr 5000W Solar Inverter 48V to 120V, Pure Sine Wave Power Inverter 5000W Built-in 80A MPPT Controller, Max.PV Input 5500W,500V,22A, Work with 48V Lead Acid and Lithium Batteries

Using this hybrid inverter as part of a backup system for when our utility shuts the power off, and it has performed very well. To get some ROI on the investment, we wanted it to power some appliances during the day and especially during 5-8 pm when our rates are the highest, and switch back to grid power when the battery dropped below 75% so that we have some backup for lights and electronics if we needed it. We were able to set it up to do just that, hence the 5 stars.There is an screen that displays the current mode of operation that is very easy to understand. For example in the picture, you can tell that the power is coming from the grid while the battery is being charged by solar.However, it was really tricky to program because of a very difficult to navigate input system. You have 3 buttons to program 37+ values, and to reach any of those you need to cycle through all the ones preceding.It is the same 2 buttons (Up and Down) to view the different sensors. You have access to many readings, such as battery voltage, output pv power, voltage and amperage, output power, etc, but that also means cycling through 12 displays, including some that are firmware-level (like the fact this is a 24V input, 120V unit). This and the programming above are areas that could be improved.For anyone trying to set it up the same way, here's my settings for a 24V Solar PV system and 24V LiFePo battery pack:* "Load Working Mode" ([01] SOL) : Use Solar first, then battery, then grid* "Battery Charging Mode" ([06] OSO : Only charge the battery with solar power* "Battery Power to Utility Setpoint" ([04] 25.2V) : When the battery drops below this voltage, switch to grid power. For my battery pack, 25.2V is 75%.Important: the manual doesn't specify this, but you must set "Battery Undervoltage Alarm" [14] higher than [04]. If it is lower, the system will simply ignore your setting for [04]. To check, after you set the value, scroll back to [04] and make sure it was applied properly. This really tripped us up initially. You can safely ignore the red "Fault" warning when this alarm is tripped off. We disabled the alarm sound as it's part of normal operation for us.* "Utility to Battery Power Setpoint" ([05] 26V): The opposite of [04]. When the battery exceeds this voltage, switch back to primary operation, in this case use solar first, then battery. For my battery pack, 26.0V is 90%.* "Battery Type" ([08] LF08): Our battery pack matches this setting the closest. Check your battery's manual for the correct values.* "Battery Undervoltage Alarm" ([14] 25.4V): Make sure to set this higher than [04]. The default is only if you want to let the battery fully discharge before switching to grid power.* "Buzzer alarm" ([25] DIS): disable the alarm for low voltage. You definitely want to switch this off if the system is often switching between solar and grid like ours.* "Alarm" ([26] DIS): This will beep when there is a switch from solar to grid or back. We turned it off.

I liked that everything was straight forward and easy to install. The Mr Power 5000 Watt 48 Volt Hybrid Inverter works perfectly! I have (10)400 watt solar panels feeding a 48 volt battery system. The Built-In charge controller automatically switches from battery charging to sending excess solar electricity to my house and then back feed the grid. Works Flawlessly! Highly Recommended!

The first unit I received was clearly used and someone had previously mounted it to the wall and severed one of the fan wires. I returned that unit and received another. Turned it on and it sounded like it was going to bounce off the wall, it was very loud. I contacted customer support and they told me it was normal. I ended up getting a fan error and opened it up to find a wire was caught in the fan! I removed that and it seemed to be working properly! Then the solar input amps dropped off dispose the array being in full sunlight, it over discharged and possibly ruined my batter bank, and all this while I’m waiting for a response from customer support. The unit is clearly not working normally as they have told me. I am returning the second one and going with a renogy product as they have a better quality record. It seems like this company just stole their design and doesn’t know how their product works!

Works well. Have evaluated and tested most features with oscilloscope, power analyzers, and bench testing. Internal battery current indication is off by 2%, but within expectations. Conversion efficiencies are well above 90%, fans turn off or down during low power usage. Thermal management good, has internal air ducting to force air to selected parts of the circuitry. Self-protects against overpower, shuts down if necessary. MPPT functions well. Overall: well worth the price for a medium sized application. I am a retired power conversion engineer and was looking for a cost effective, reliable system. It more than met my expectations so far. Will update if I have future reliability issues.

At first it worked good. Then it started saying the Batteries are 100% charged in the mornings after I used the power all night. Thinking the batteries are full it doesn't charge the batteries the next day and eventually the batteries run out of power. To be able to use my solar system I have to shut down the PV input, turn the inverter off, Then disconnect the batteries. Next turn the batteries back on, power up the inverter, then turn the PV back on. and it will work fine untill the next morning. They only have email web support You must have a jpeg of your invoice, a video showing the problem and a picture of your spec sheet on the bottom of the unit to even send an email. Maybe they will get back with you or maybe not. I can't be gone over night because I don't want to loose my refrigerator or freezer full of food I am totally off grid. I have a Bluetti AC 300 I use as a backup but I have to be there to use it. After doing this review it has started working correctly again and has been working flawless sense then around one month. I am updating the review to 4 stars.