© 2023 by XOLTA
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4.3.2 General electrical requirements
The XOLTA Outdoor BESS has been designed for connection to low voltage three-phase 400V AC
50Hz electrical grids. However, the system can also be connected to grids with other voltage levels
if appropriate power/voltage transformers are in place to match the required voltage.
All installation and commissioning work must be carried out by a certified electrician. Any subsequent
changes or modifications performed by unauthorized personnel are strictly prohibited and could
compromise safety.
NOTE!
Residual current device (RCD) is not required. If there are site-specific reasons for requiring such an
installation, then ensure the device detection/trip points are >1A for a single inverter configuration.
Contact XOLTA support for further advice.
4.3.3 Communication requirements
A XOLTA BAT-80 outdoor system consisting of one or multiple battery racks, external meters and
other peripherals communicates via PDS-CAT-6 cables from each device to a central switch securing
inter-rack communication and communication to the XOLTA cloud via the internet.
Battery racks use DHCP to acquire an IP address. Optionally: reservation of the IP addresses can be
managed in the router.
NOTE!
It is important that meters are connected within the same subnet and with fixed IP address allocation,
static or via reserved IP in the router.
4.3.4 Installation with and without renewables
The block schematics in Figure 4.3 and Figure 4.4 depict a typical installation of the different types
of XOLTA Outdoor BESS unit racks with and without solar panels.
Table 4.1:
Connections
ELECTRICAL/COMMS
CONNECTIONS
REQUIREMENTS
Electrical Panel
Nominal inverter current per rack
(stated in “requirements”)
Install pre-fuse/circuit breaker
accordingly
3 x 400 VAC + N, 37A (BAT-80/25)
3 x 400 VAC + N, 45A (BAT-80/30)
3 x 400 VAC + N, 74A (BAT-80/50)
3 x 400 VAC + N, 90A (BAT-80/60)
BPU power supply
1 x 230 VAC +N + PE, 10A per rack
External power meter
3 x 400 VAC + N + PE per meter
Protective earthing
Sizing according to power level above
RCD
Not required
BAT-80
Inverter mains supply
3 phase 400 VAC + N + PE per rack
Terminal size rack SAG 35mm
2
Multi strand CU-cable required with min.
bending radius r50mm
BPU supply
1 x 230 VAC + N + PE, 10A per rack
Terminal size SAG 2,5mm
2
Communication to central switch
Ethernet CAT-6 cable per rack
Earthing
Terminal size rack SAG 35mm
2
External
communication switch
Ethernet communication
between batteries, power meters
and other system peripherals
1 port per battery rack
1 port per power meter
TCP/IP Power meter
Power meter power supply
3 x 400 VAC + N + PE per meter
Current transformers
(X)A/5A
Ethernet connection to
public internet
Ethernet CAT-6 cable per site
