GivEnergy Connect EPS Hybrid and AC Deye Inverter and Auto Changeover Switch User Guide
- June 15, 2024
- GivEnergy
Table of Contents
ISLAND MODE
Connect EPS Hybrid and AC
User Guide
Overview
All inverters come with the option for providing an Emergency Power Supply (EPS), this can be used to provide power in the event of a grid outage. The EPS terminals are powered from the grid supply whenever it is available. When the inverter detects a grid outage it will automatically switch to take power from the batteries and solar (if available, on Hybrid inverters only).
Maximum Output (kW)| Gen 1 Hybrid
3.6 / 5kW| Gen 2 Hybrid
3.6 / 5kW| AC Coupled
3 kW
---|---|---|---
2.6 Battery only| 1.25| 1.25| 1.25
5.2, 8.2kWh batteries only| 2.6| 3.6| 3.0
All batteries with solar| 3.6 / 5| 3.6 / 5| N/A
An overload of the EPS circuit may damage the inverter. If the EPS circuit is
overloaded, backup power will be lost for a minimum of 5 minutes, or until a
manual restart is performed on the system. Multiple backup overloads may cause
permanent damage to the inverter.
Care should be taken to ensure that the EPS installation meets wiring
regulations set out in BS7671 and the IET Electrical Energy Storage Systems
(2nd Edition). The inverter creates a Neutral-Earth bond internally upon loss
of grid, this means an external relay is not required.
Please note that a small delay will be experienced following loss of grid
before the EPS system energises. This should be approximately 5 seconds.
CONNECT EPS | HYBRID AND AC (ISLAND MODE)
Electrical Connections
The EPS connection can be found under the same cover as the AC input, the EPS terminals are on the left side with the grid terminals on the right. The EPS output cable must be protected as close as possible to the inverter with at least;
- Double pole RCD protection at a maximum of 30mA
- Overload protection between 6 – 25A
Note
The EPS terminals will be live whilst the inverter is powered from AC,
Battery, PV, or any combination – ensure safe isolation procedure is followed
before removing the terminal covers.
EPS outputs for multiple inverters must not be joined. 
Earthing
In island mode, EPS circuits must not rely on a TNS or TN-C-S earthing system
as when grid live is lost grid earth and neutral may also be lost. A TNS or
TN-C-S earthing system may be left connected when operating in island mode.
Some key points to consider are;
- Earth electrode resistance (ZEE) should be as low as possible and not exceed 200Ω.
- An earth bond should be provided between the inverter casing and all batteries.
- Earthing must be provided to the EPS output circuit(s) as the earth terminals for grid and EPS are not linked within the inverter.
Futher Support
If you have any further queries or are unsure of any points covered in this
document, please send them to
support@givenergy.co.uk.
Method One
Socket connected directly to EPS output terminals via consumer unit
Advantages
Easy to install, simple to explain. The backup power should last longer, due
to minimal loads.
Disadvantages
Requires manual intervention by end user.
Installation
Install a single/double socket close to the inverter that is fed by the EPS
output (via a consumer unit). The socket will be powered via the inverter,
during normal operation and in the event of a power failure will automatically
switch to EPS mode, so long as the battery has capacity. The end user can plug
in devices of their choice.
Earthing
Socket/consumer unit will require TT earthing method.
Note: With method 1, the grid supply to the GivEnergy inverter and any
other grid tied generation may be supplied from an exisiting consumer unit.
Method Two
EPS consumer unit supplying dedicated EPS circuits
Advantages
Backup of dedicated circuits only, less risk of accidental overload. Backup
should last longer due to only supplying essential circuits.
Disadvantages
Does not backup whole property, requires re-wiring of existing circuits or new
circuits to be installed.
Installation
Install a small consumer unit that is fed by the EPS output. This consumer
unit can have new or existing circuits installed into it. All circuits
connected to this consumer unit will be powered via the inverter, during
normal operation. In the event of a power failure, it will automatically
switch to EPS mode, so long as the battery has capacity.
Earthing
At a minimum, the EPS consumer unit will require TT earthing method.
Note: With method 2, the grid supply to the GivEnergy inverter and any
other grid tied generation may be supplied from an existing consumer unit.
Method Three
Full property backup with manual changeover switch
Advantages
Full property backup, manual changeover acts as a reminder to turn off heavy
loads before switching to backup mode.
Disadvantages
Requires manual intervention by end user.
Installation
Install a manual change over switch at the point of the incoming supply. In
the event of a power failure, the end user can switch over to EPS mode. All
circuits in the property can then be supplied by the EPS output, so long as
the battery has capacity.
Earthing
Whole property will require TT earthing method for off grid operation.
Note: With method 3, the grid supply to the GivEnergy inverter and any
other grid tied generation must be supplied from the grid side of the manual
changeover switch.
Method Four
Full property backup with auto changeover switch
Advantages
Full property backup, auto changeover means no intervention required by end
user for backup mode.
Disadvantages
Risk of accidental overload if a heavy load was switched on prior to grid
failure.
Installation
Install an auto change over switch at the point of the incoming supply. In the
event of a power failure, the supply will automatically switch over to EPS
mode. All circuits in the property are then automatically supplied by the EPS
output, so long as the battery has capacity.
Earthing
Whole property will require TT earthing method for off grid operation.
Note: With method 4, the grid supply to the GivEnergy inverter and any
other grid tied generation must be supplied from the grid side of the auto
changeover switch.
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