Please give us info about your system.
Regarding the logger cost there is few factors why the price is 4k, first is the global chip shortage. Most of the component are not available and those that are available got price increase in in the range of hundreds percent. SolarMD LoggerV2 uses special isolated transceivers for every coms port except USB. This is required in most of the European countries. This is why the cost is 4k.