Step 10 Number of Strings per MPPT

Concept

Np Total PV modules in portrait per string (units)

Ns Total PV modules in series per string (units)

Nt Total PV modules (units)

• In this article, means per string, ≈ Nt per MPPT

Npmax per MPPT Maximum number of PV strings per MPPT (units)

If all options failed, reduce Ns, although it can't match Nt per mppt

• • If want to use all solar modules (Nt = Nt per mppt), choose another inverter.

Steps

1) Select Np which has Ns that are closest to Ns rec 

2) Select Ns rec as Ns 

10.2 Calculate Nt per MPPT

Nt per MPPT Total PV modules per MPPT (units)

Nt Total PV modules per inverter, in general can be Nt ac pwr in Step 1 Choose Inverter (units)

NMPPT Number of MPPT/ Numbe of MPPT trackers in inverter datasheet (units)

• • • • • • • Select single value, exp datasheet below show NMPPT is 3 units, not 9 units (Total NMPPT)

Nt per MPPT = round down [22/2] = 11 modules per mppt

10.4 Determine Np and Ns