Manual Energy Storage Inverter ESI-S
Electrical design and installation 39
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6 Electrical design and installation
6.1 What this chapter contains
This chapter gives the data required for integrating the ESI-S successfully in an electrical
installation. It also gives electrical connection examples for popular energy storage
features.
WARNING: The ESI-S is able to operate on networks in a voltage range 208-240 V and
380-415 V with a tolerance range of +/- 10 % (inclusive of harmonics but not
transients). Since operation at the upper limits of voltage and temperature may
reduce its life expectancy, the ESI-S should not be connected to systems for which it
is known that over voltages will be sustained indefinitely. Excessive voltage levels may
lead to inverter damage.
WARNING: The ESI-S is not designed to be connected to systems where one phase
serves as neutral. Connection of an ESI-S to such a system is only authorized after
explicit approval by ABB.
The inverter must be connected to the network in parallel with the loads.
WARNING: The ESI-S does not incorporate protective power line fuses or main
contactor. Hence the customer has to ensure that the feeding cables to each inverter
panel are adequately protected taking into account the inverter rating and the cable
section used. More information on this topic is presented in
Section 6.7.
Basic functionality can be obtained after connection of:
−
Ground (PE) (per enclosure)
−
Four power cables including neutral. The neutral connection is not mandatory for
filtering three phase loads. The power lines must be protected by appropriately
sized fuses or a contactor.
−
DC power cables to the Battery
−
3 CTs (one per phase, to be connected to each unit in a system through a daisy
chain method with return path)
More advanced features (e.g. external monitoring of the inverter status, islanding, black
start…) require some more connections. The connections for these advanced features
have to be made on the ESI-Manager and on the network.