Technical Notes
FlexRack Technical Notes 9/12/21
1. The 500A busbar is only intended to contain eFlex batteries + approved 48V accessories.
2. The Flexrack does not come with the M6 hammer bolts and flange nuts needed to secure the
eFlex to the shelving system at this time. We recommend 1.5” (35mm) M6 hammer bolts and
flange nuts (or washers with locknuts). Only one bolt per eFlex is needed.
Ex. https://www.amazon.com/PZRT-Hexagon-Standard-Aluminum-Profile/dp/B08V1QQXWY/
3. The FlexRack does not come with battery cables.
4. For best results, use #4AWG or #2AWG fine-stranded “flexible, high ampacity cable (see NEC
Table 400.5) such as UL3311 Battery Cable. If using #2 wire, please confirm the compression
lugs are compatible with fine stranded wire.
If using regular stranded cable, create longer battery cables with minimum #1 AWG than pictured above
and angle the cables coming off the eFlex stud terminals to achieve minimum bend radius.
5. The cable lengths should be 12” positive + 8” negative for each eFlex, plus what is necessary
to string back for the crimp lug barrel (typically ½” per side).
6. Use a 3/8ths or 10mm compression ring size for the eFlex lugs. The inverter lugs are a larger
bolt size requiring either 7/16ths to ½” or 12mm compression ring sizes.
7. The longer, positive eFlex cable requires a 45 degree angled crimp ring terminal lug in order to
kick the positive cable around the negative busbar. Research will indicate that #4 regular
stranded crimp ring terminals have the same barrel diameter as #4 fine stranded crimp ring
terminals - so any #4AWG crimp ring terminal with a 45 degree kick will suffice. If using a
straight ring terminal, use zip ties to keep the positive battery cable from touching the negative
busbar.
8. When installing parallel inverters, it is acceptable to land parallel conductors on both sides of
the busbar bolt. In this case, one of the negative inverter-to-battery conductor compression
lugs will require a 45 degree kick - see example materials.
9. The Flexrack maintains a protected ½” clearance from cabinet side walls to energized parts
components per NEC 310.10(3) even when the sidewall is deflected inward.