This thing is good because its durability was so standard .I charge one time the back of battery100 amp with use of one fan 14 hours. I see that my older inverter charging so much because battery was hot its die . But microtek ups full charging stop it . And one thing I juge that when 50w lodding inverter cooler start and cool it . In charging time fan cooler was start cool it. One time I use four fan my 1100eb2 in back side facility of hige charging batter is fast than faster.use of inverter is very essay only buttan press its on.after light was going pc was closed.