ChristofR

I've been running two of these in series on a 24V for a week now and I'm very impressed. I have no reason to doubt the 200Ah capacity rating. The construction looks decent and my (also single page) datasheet had the correct 2S voltages of 25.6V / 27,2V and 28.4V (nominal / float and bulk). I ran a capacity test lasting 19h and these are my results. The total capacity turned out to be 5.35kWh (rated in 2S configuration is: 25.6V nomimal x 200Ah = 5.1kWh). The higher capacity is due to very low C rate of this test. One thing I did notice is that the battery voltage is greatly impacted by the load power with increases / decreases in the load clearly visible in the graph below. Note, detailed measurements were stopped after 12h, the load was simply kept constant after this until auto shutdown at 22V after 19h. Total runtime (h) 19 Ave load (kW) 0.232 Ave discharge rate (C) 0.045 Ave inverter power usage (W) 50 Total kW used by load (kWh) 4.4 Total kWh used by inverter (kWh) 0.95 Total kWh produced (kWh) 5.35

TL;DR: the power factor is indeed extremely low and my unit consumes very close to 50W at standby (not 35W as stated in the datasheet) I recently bought a RCT Axpert VM III-3000-24. Upon my initial power measurements I was very concerned about the standby power usage as my clamp current meter was measuring between 1.2A and 1.3A. Upon reading this thread I decided to invest in two Kill-A-Watt units to measure the true power usage. I currently have no solar and am running this simply as a backup UPS. After running one on the AC input and one on the inverter output I can now share my results. Total test run time: 7d 10h Total power in: 34.7kWh Total power out: 25.2kWh Ave load: 140W Max load: 700W Min load: 30W Inverter standby power: < 50W (AC in and battery, doesn't seem to make much difference) Inverter power factor with no load: 0.17 Attached are images of the power factor and standby power usage over one hour.