12
13
Figure 3- 2 Schematic diagram of hybrid system
3 Product Introduction
PV Array
STH 4-12KTL-HT
CT
Meter
Three Phase Storage
Inverter
Back-up Loads
Grid
On-grid Loads
High-voltage
Lithium Battery
AC
RS485
DC
3.1.4 Schematic Diagram of Hybrid System
The hybrid solar system is usually composed of the PV array, hybrid inverter, lithium bat-
tery, loads and power grid. As shown in the Figure 3-2:
3.1.5 Operation Modes
Sunways STH Hybrid inverter has the following basic operation modes and you can config-
ure the operation mode as per your preference in the App.
3 Product Introduction
PV
Inverter
Loads
Grid
Battery
In this working mode, when the power from
the PV array is sufficient, PV power will
supply the loads, battery, and grid by the
following sequence:
Loads＞ Battery＞ Grid.
PV power will supply the loads first, and
second charge the battery, and then feed to
the grid. (You can set the power to the grid
to 0W if the local grid doesn’t allow).
When the PV power is insufficient, the battery
will discharge to supply loads, and the grid
will join in if the battery is not enough to sup-
ply loads.
When the loads consumption more than the
Pmax, the power exceeded Pmax (cannot be
higher than the inverter max output power)
will be supplied by the inverter. Inverter will
use power from PV array to supply loads
first and battery second if it isn't enough.
PV
Inverter
Loads
Grid
Battery
Mode 1
Mode 2
Screen Setting step:
① General Settings → WorkMode Set → Gen-
eral Mode
② Advanced Settings → Peakload Shifting →
ON
③ Advanced Settings → SetMaxGrid → XXX
(kVA)
APP Setting step:
General Mode → To Set → Peakload Shifting
ON → Set Max Grid (kVA)
PV
Inverter
Loads
Grid
Battery
In this working mode, set the Pmax from grid in the App can realize the “Peakload Shifting”.
PV
Inverter
Loads
Grid
Battery
Pload≥ Pmax