Review on 🌞 Efficient 3000W Solar Hybrid Inverter: 24V DC to 110V AC, Pure Sine Wave, Off Grid All-in-One Solution with 60amp MPPT Controller - Max 3000W 100V PV Input for 24V Lead Acid/Lithium Batteries by Ryan Hill

I was looking for an inverter that could deliver 3kW while handling grid, 24v battery and solar power with user set priorities. I couldn't find a reputable low frequency converter that did what I needed. This one comes close, but it's a high-frequency type. For $600 I decided to give it a try. I have had bad experiences with a high frequency inverter. He has trouble starting a large load without shutting down the system, blowing fuses, or blowing up the weakest FET since they parallel many of them. The low frequency design uses a large energy storage iron core, 1/2 LI^2, to handle the peak load. The circuit is designed for a separate circuit in the house, designed for a UPS with a load of 250 W to 850 W. A 120 V home network is supplied through this inverter. During the day it charges the battery via the solar panel and supplies the house with 120 VAC. At night, it consumes battery power until it is about 30% discharged, and then automatically switches to AC power. The battery is charged the next day via the solar panel. It worked well for several weeks with a net gain of around 7kWh per day. The heaviest load I tried was a 1500w microwave, it started up fine, the fan sped up to maximum speed in just under a minute. The air came out quite wormy. My comments/problems: - There is no temperature control for charging in the box, LiFePO4 cannot be charged at temperatures below 0C. Lead-acid requires temperature compensation.- Operation depends on 2 fans running constantly, variable speed, quite noisy- Manual in Chinese-English requires some imagination to understand- Fans move air from the top to the bottom of the unit, which is thermodynamically not intuitive is point of view. - WiFi dongle is unusable for me. It does not serve as a remote control for the control panel. The app wanted me to share my personal information to the app owner in China for data registration only. There are several settings for the operating status warning. However, these warnings are referred to as "Fault" and are indicated by a flashing red Fault LED on the control panel. This may cause users to worry about the health of the system while it is functioning normally. The buzzer warning can be disabled by the user, but not the "Error" LED. I found it annoying. The consumption is relatively high at 50W in idle. A block diagram of the structure would be helpful for many users. A better understanding of how this works would help in using the product correctly. The transition from one mode to another, for example from battery to mains, is inconsistent. For example, if you set the battery-to-grid transition to 27.2 volts, the transition may occur prematurely. I think it happened because the control system picked up the peak voltage during the load transient. This problem can cause the device to switch to mains much earlier than you set the voltage. I noticed that Midnite Solar offers the same thing by contacting the manufacturer of the product in Shenzhen, China and putting the label "Midnite DIY" on it. That. It's a bit more expensive but I don't think they could add value as they don't control the design and manufacture. The only good thing is that the folks at Midnite have probably already delved into the details of the design and done some testing. Each design topology has its advantages and disadvantages. Additional design improvements can be made, but they cannot avoid the intrinsic nature of the high frequency conversion limitations. They have a maximum allowable PV voltage of 100V. You need to be careful if you live in a cold weather area where you sometimes see sub-zero temperatures. Increasing PV voltage with decreasing temperature. For safety reasons, the voltage of the PV module should not exceed 80V. This usually means that the FET in the charger's buck converter is rated at 100V. The FET fails when the PV voltage is higher than 100V. I have found that the MPPT is well below the 99% stated in the specification. battery charge. Current is supplied to the battery and the input of the inverter at the same time. Nothing special, the AC power from the inverter comes from both the battery and the PV via the charger. Knowing this, I simply connect the PV to the MidNite Classic to charge the battery. This hybrid inverter runs much cooler because the charger is no longer using energy. Also, MidNite Classic works better as MPPT charger with higher power and voltage. What do I have left? Well, this hybrid inverter still does a good job of managing multiple power supplies for the price. Be careful when using this hybrid inverter to charge your LiFePO4 from the grid. The instructions are practically useless. There's a good chance you're overcharging your battery due to confusing instructions. The OEM of this hybrid inverter is located in China. There are many companies, mainly Chinese, selling the same product under their own name. They don't seem to have the design knowledge to support their customers. So you're on your own if that fails. Also, I don't think MidNite Solar can do anything for the device under their name. You must remember that you cannot operate this hybrid with maximum charging current (60A) with 3000W output power of the inverter, otherwise you will overheat the device. and the fans can't keep up. After 1.5 months of use, I decided to use it with the MidNite Classic as a full-time charger and keep the inverter power below 60% to reduce heat and avoid heat-related failures that drained my $6,000 LiFePO4 battery could destroy. Finally, the data sheet says "inverter efficiency > 95%" which is not true. 20-80% is the best case I've seen across the load range. Do the laws of physics work differently in China or is it just a lie? I'm interested to see how this device was designed and how it works by looking at it casually. I would like an additional device to evaluate the performance in detail to be sure that it is reliable. After all, this $600 inverter/charger connects to my $6,000 battery. It would be a disaster if the charger failed and unduly drained the batteries. I downgraded my rating to 2 stars because at close to the max specs (3kW inverter power with 60A charging current) it gets too hot when the fan is running. the highest speed. Excessive heat means shorter lifetime as the junction temperature of semiconductor devices is above the limit (typically 150°C). The device is not designed for continuous operation at maximum power. In addition, the efficiency figures of 99% for the MPPT and 95% for the inverter are incorrect and greatly exaggerated.