PowerWalker VFI 1000 LE - Manual (Page 15)

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Wiring & Grounding
Installation and Wiring must be performed in accordance with the
local electrical laws and regulations.
The UPS must be securely grounded. If there are external UPS
battery cabinets, please make sure the battery cabinets have the
equipotential earth bonding to the UPS main cabinet.
An appropriate switch device as backup protection for over-current
or short-circuit should be provided in the input utility.
Battery
Strictly follow the principle of “same voltage, same type” when
paralleling multi battery packs.
DC breaker or fuse must be used as a protection device between the
external battery pack and the UPS. The spec of protection must be matched
to the UPS specification.
2.2 Unpacking and Inspection
2.2.1 Unpack the package and check the contents. The shipped package
contains:
1 UPS
1 user manual
2.2.2 Inspect the appearance of the UPS to see if there is any damage during
transportation. Do not turn on the unit and notify the dealer immediately
if there is any damage or lack of some parts.