Sizin of input and output conductors.
Conductors have resistance that opposes the current flow and produces a
volta e drop and heatin . The resistance is directly proportional to the len th of
the conductor and is inversely proportional to the thickness. Consequently, a
lon er and thinner conductor will have hi her resistance and will produce a
hi her volta e drop and more heatin . The size of a conductor for a particular
application will depend upon the maximum current it is required to carry and for
what distance. The size of a conductor is desi nated by AWG (American Wire
Gau e) number. The smaller the AWG number, the thicker the conductor. The
conductors should be sized for a maximum volta e drop of 2%. The cables
should be multi-stranded insulated copper cable rated for at least 90 º C and
preferably oil resistant. To purchase cables, please visit a weldin or marine
supply store.
Cables for 24 VDC input and 12 VDC output connections.
The cables on the 24 VDC input side must be able to carry a max.current of
approx. 4.2 A (for extreme conditions when deliverin 5.5 A on the output at
current limit at lowest 24 V input battery volta e of 20 V). To limit volta e drop to
2%, use # 14 AWG for distance up to 6 ft. and # 12 AWG for up to 10 ft. The cables
on the 12 VDC output side must be able to carry the full 5.5 A current under
current limit conditions. To limit the drop in volta e to 2%, use # 14 AWG multi
stranded cables to connect to the load for a distance of up to 6 ft. and # 12 AWG
for a distance of up to 10 ft. Use female quick connect terminals (tab size 6.3
mm) on the ends of the cables to enable connection to the male tabs of the
terminal block.
External fuses on the input and output sides.
The input and output connections should be made throu h 32 V, 5A fast blow
fuses (For example “Bussmann” Type ATC-5 or ATM-5 automotive type fuses). The
fuses should be connected in series with the positive input and output cables. The
fuse on the 24 V input side should be as close to the battery positive terminal as
possible. This will prevent the possibility of overheatin & meltin of the input side
cables in case of short circuit on the input side cablin (A battery can provide
very lar e currents durin short circuit condition)
WARNING:
The warranty will be voided if the above external fuses are not used
