Preliminary Operations For Connection Of The Pv Generator; Independent Or Parallel Input Channels Configuration - ABB UNO-DM-TL-PLUS-US Product Manual

P
reliminary operations for connection of the PV generator
I
ndependent or parallel input channels configuration
All input parameters that must be met for correct inverter operation are shown in the "techni-
cal data" table.
The inverter is equipped with two input channels (thus benefiting from two
trackers for MPPT maximum power point tracking) which work independen-
tly of one another, which can be paralleled by leveraging a single MPPT.
Strings of photovoltaic modules having the same type and number of
panels in series must be connected to each single channel; they must
also have the same installation conditions (in terms of orientation to the
SOUTH and inclination from the horizontal plane).
When connecting the two input channels in parallel, you must comply
with the above requirements in order to benefit from the ability to levera-
ge the full power of the inverter output on a single channel.
The dual MPPT structure however allows management of two photovol-
taic generators which are independent of each other (one for each input
channel), and which may differ between themselves with regard to instal-
lation conditions, type and number of photovoltaic modules connected in
series. A necessary condition for the two MPPT to be used independently
is that the photovoltaic generator connected to each of the inputs has a
lower power than the power limit of the single input channel and a maxi-
mum current lower than the current limit of the single input channel.
- 55 -
5 - Installation