PV MPPT Controller Selection: DC-Coupling PV Access Guide
Summary: 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) or buck-boost (Leona-M200K), 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 for a split-decoupled hybrid — PV and PCS sides deployed/maintained independently.
FAQ
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.
