nmb100

Hi. I am very new to the inverter world, but saw this post and think it relates to my queries. I have the 3kV Axpert inverter with 24V (2 x 12V) AGM batteries linked and no solar, simply charging the batteries from a plugpoint, not directly onto the DB board. I cannot get the Watchpower software to work with a PC (I had to find one with a serial COM port). The software installs fine, but it is not communicating with the inverter. The PC I am using is Windows XP. Any thoughts? I have changed the baud rate to be the same on the PC com port and Watchpower. I thought about trying to make a RJ45 to RJ45 network cable, which would then alleviate issues of distance a lot, but am not sure which Rx/Tx/GND wires to use. From what I can tell, using settings 26, 27 and 29 enables me to turn off the inverter when say we have a major power outage and the batteries are depleted to a specified level. Am I able to set the batteries to continue discharging, even if the Utility power returns, until almost the depleted setting? I was informed by my battery guy that discharging the battery to only 80% remaining, uses a full battery cycle, whereas running it to around 20% remaining, then switching back to the mains, will lengthen the battery life as the cycle will not be used. Thanks. If anyone could be of assistance, I would be greatly appreciative.