PV OFF-GRID INVERTER

BLACK&BROWN

SITEC 4500‐H is designed to serve as a backup power supply for AC loads. The input power of SITEC 4500‐H comes from PV system and AC grid which not only supply power to AC loads but also charge the battery bank when the power from AC grid or AC generator is present (also known as Line Mode).

In the event of AC grid (or AC generator) outage, the AC loads can be alternatively powered by PV system (if the illumination is sufficient) and battery bank. Please find below the system diagram of typical application.

SITEC 4500‐H can automatically enter 9 different operation modes depending on the status of DC input power (PV) and AC input power. Please refer to the following table for the 8 operation modes and their corresponding conditions.

AC Input GRID Power Present:
Strong PV Power : LINE‐PV or SOLAR‐PV
Less PV Power: LINE‐HYBRID or SOLAR‐HYBRID
No PV Power: LINE MODE
No PV Load : CHARGE MODE

AC Input GRID Power Absent :
Strong PV Power: INV‐PV
Less PV Power: INV‐HYBRID
No PV Power: INV MODE
No PV Load : CHARGE MODE

LINE‐PV
AC loads are supplied by AC grid (or AC generator), and DC input power
(PV) is strong enough to charge battery bank without consuming AC power.

LINE‐HYBRID Mode
AC loads are supplied by AC grid (or AC generator). The power used to charge
battery bank firstly comes from PV system and the rest comes from AC grid (or AC generator).

LINE MODE
As DC input power is too low, AC grid (or AC generator) not only supplies AC loads but also charges battery bank.

INV‐PV Mode (Inverter‐PV Mode)
AC loads are supplied by PV system as backup power without consuming the power from battery bank, and surplus PV power will charge the battery if AC loads is less than 2.1kW.

INV‐HYBRID Mode (Inverter‐Hybrid Mode)
AC loads are supplied firstly by PV system and the rest by battery bank. The power from PV system helps to prolong the backup time.

INV Mode (Inverter Mode)
AC loads are supplied only by the battery bank.

CHARGE Mode (Charging Mode)
When AC grid is not available, PV system can take over to charge the battery as long as no AC load is connect