I'm looking to buy one of the SmartSolar Charge Controllers, probably the 250/70.
Then I notice that it has no connection for battery voltage sense leads, and that you have to buy a separate dongle that sends this via Bluetooth. I'm very confused about this design decision, since a battery sense is essential to make any controller work in a reliable way. Why make it a separate product, and why send it over Bluetooth, when it is just two simple cables? Can someone explain?