# PV MPPT Controller Selection: DC-Coupling PV Access Guide MPPT feeds PV into the DC bus and tracks max power. Boost/buck-boost, string count and power sizing, with Leona-M200K, SP135HAPV, SP120/60HCPV. What MPPT does An MPPT (maximum power point tracking) controller feeds PV into the DC bus and tracks peak power for DC coupling. Three selection factors **Topology**: boost ([SP120/60HCPV](/en/product/sp120-60hcpv-sp105hcdc)) or buck-boost ([Leona-M200K](/en/product/sp200-150hapv)), wide-voltage. **Strings/MPPT count**: multi-string combiner at array side (Leona-M200K 16 in / 8 MPPT; SP135HAPV 12 in / 6 MPPT). **Placement**: IP65 wall-mount near the array cuts long PV cabling (Leona-M200K key value). Pairing advice New DC-coupled microgrids prioritise MPPT; pair with [H135K](/en/product/sp135hapss) for a split-decoupled hybrid — PV and PCS sides deployed/maintained independently. ## Boost vs buck-boost? Use boost when array voltage is below the bus; use buck-boost when it can be above or below for flexibility. ## Benefit of many MPPTs? Multi-string + multi-MPPT combiner at array side reduces long DC cabling and loss and improves layout freedom. ## How to size MPPT vs PCS? Match total PV to AC-side PCS; a split-decoupled design can put high-power MPPT on PV side and PCS on AC side. ## Is the wall-mount MPPT waterproof? Leona-M200K and SP135HAPV are IP65 wall-mount for outdoor near-array deployment.