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12
User Manual V1.1-2022-01-05 02 Installation Instructions
• Battery voltage is lower than discharge voltage.
• Battery over heating protection.
• Battery communication is abnormal for lithium battery.
• BMS limitation for lithium battery.
When charge/discharge current limitation protection happens:
• Under on-grid mode, battery charge/discharge operation could be abnormal.
• Under o-grid mode, Back-Up supply will shut down.
Note:
• Under o-grid mode, if Back-Up supply shuts o because of battery, low battery SOC or voltage, PV
power will all be used to charge battery till battery SOC reaches 40% +(1-DOD)/2, then Back-Up supply
will be activated.
• Under on-grid mode & o-grid mode, battery is protected from over discharge by DOD and discharge
voltage.
• The DOD setting of a battery prevents the inverter from discharging battery reserve power. As soon
as the DOD is reached the load of building will only be supported by either PV power or the grid. If
there are continuous days when little or no battery charging occurs, the battery may continue to self-
consume energy to support communications with the inverter. This behavior is dierent between battery
manufactures products, however, if the SOC of the battery reaches a certain level, the inverter will boost
the SOC back up. This protection mechanism safeguards the battery from falling to 0% SOC.
2.4.4 On-Grid&Back-up Connection
An external AC breaker is needed for on-grid connection to isolate the inverter from the utility
grid when necessary.
The requirements for the on-grid AC breaker are shown below.
Inverter Model AC Breaker Specication
GW3648D-ES 32A / 230V (e.g. DZ47-60 C32)
GW5048D-ES 40A / 230V (e.g. DZ47-60 C40)
Note: The absence of AC breaker will lead to inverter damage if an electrical short circuit happens on
grid side.
1. Use separate AC breakers for individual
inverters.
AC breaker
AC breaker
AC breaker
AC breaker
Grid
Grid
Load
2. On the AC side, an individual breaker
should be connected between the inverter
and grid but before any loads.
Requirement of AC cable connected to On-Grid and Back-Up side.
Make sure the inverter is totally isolated from any DC or AC power before connecting the
AC cable.
Note:
1. Neutral cable shall be blue, line cable shall be black or brown (preferred) and protective earth cable
shall be yellow-green.
2. For AC cables, PE cable shall be longer than N&L cables, so in case that the AC cable slips or is taken
out, the protecting earth conductor will be the last to take the strain.
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