The section devoted to charging batteries from solar: here you will find the Litio Store SOLAR BOOST 4820 charge controller, a buck-boost unit with Bluetooth that works on 12V, 24V, 36V and 48V systems and accepts an array whose voltage is either above or below that of the battery.
The boost function is what sets this controller apart from a conventional MPPT: it lets you charge a 48V battery from two or three 12V panels in parallel, a common situation when upgrading an existing installation without rewiring the strings.
Bluetooth is there to set the charge profiles and read production from your phone, with no extra display needed.
