1200W Pure Sine Wave Inverter with AC Charger, DC 12V to AC 120V Output,UPS Backup Power Low Frequency Inverter for Lithium, Sealed,AGM, Gel,and Flooded Batteries

This review is for the HT-80112, the 800 Watt unit. I received it Oct 19, 2022 and was pleased to find that cables were included with the unit. I cut the positive cable and attached crimp lugs to each cut end, and inserted a 175 Amp fuse from O’Reilly’s. I also checked the output connector that I expected to be miswired after reading the other reviews. Mine is wired correctly.I initially found the menus a bit funky, but they actually work fine once you get the feel for them. I set my unit up for AGM, 20% charge rate, unattended mode with dropout at 11.5 V and restore at 12.5 V. I hoped to find that with input power disconnected the inverter would operate until the battery voltage dropped to 11.5 V, at which time the unit would wait for utility power to be restored. Note that as shipped, the dropout voltage is set for 10 volts. I tested the unit with my router, the fiberoptic internet interface, a security system, a microprocessor, and a 75 Watt incandescent bulb for loads. I used the old battery I took out of my pickup, so it only ran a couple of hours, but it worked exactly as desired. When I restored power the battery started charging and completed charge normally. Initial charge rate was around 13 Amps.I’ve pulled power several times and all the equipment stays online. This unit does exactly what I need and has an excellent price. All the connectors are quality and well placed. My one criticism is that the marketing is inadequate. It was unclear to me when I ordered the unit that I could set the dropout voltage, which is critical for unattended operation.I emailed the manufacturer twice before I received the unit and received responses each time within 24 hours. I tried unsuccessfully to find a manual for the unit on their website, but was sent one by the manufacturer. The FT series has manuals available for download, but it seems the website hasn’t been finished for the HT series yet.I next bought the UB121000 100AH battery from Amazon. I ended up setting the dropout voltage for 12.0 volts and using the Lithium Ion/Customize menu set the float voltage to 13.6 volts. The only time my battery will be under load is if the power goes off, and all I really need is either to ride through a power glitch, or have a clean shutdown and a clean startup when the utility power comes back online.I’ve attached photos of my inverter waveforms with my 35 Watt load attached. The inverter isn’t quite as pure as utility power, but it isn’t bad. One photo shows the transition from utility power to inverter, and the other shows the transition from inverter to utility. Inverter to utility looked identical in various captures. I only did the one capture of utility to inverter, which happened when I pulled the wall plug to the inverter. One nice thing is when you restore utility power the inverter waits a couple of seconds before it switches back to utility power, so the glitch you sometimes see when utility power is coming back online is masked.I initially thought I might use the unit to equalize an older flooded cell battery, so I set the float voltage to 15.5V. I never got a straight answer out of their tech support as to what the unit is actually capable of, but it isn’t 15.5 Volts, even though you can set it in the menu. I did see it maintain 14.7. The specs in the manual show DC input voltage: 10.5 to 15 volts.I discharged my UB121000 battery for 15 hours for a total of about 42 Amp Hours to around 12.23 volts. It was mostly recharged in about three hours, but I was still seeing around 100mA of charge current 24 hours later. This unit has all the features I need and works great. I couldn’t be happier with it.Oct 31, 2022