We have a small 12V system, 460amp Lithium, 800watts Shadow Flex Solar, 2000w inverter all Renogy equipment. The controller install and program are straight forward. Impressed with the 60watts input we are still getting 6 or 7 amps of charging very early and late in the day. Not happy that the voltage on the 20 amp feed can not be regulated by the program. When in bulk charge that means the bulk voltage in our case is 14.1v is supplied directly to are 12v equipment and lights. The 20 amps is also to low to run our 2000watt inverter thus the inverter is wired directly to the 12v battery which does not report the amp usage to the program so the amps shown by the program do not reflect the correct amp usage. I do like the system, we have had it in use since January, more than meets are needs the few short falls of the amp usage can be over come with an additional external monitor.