805OPM
Cable sizing
For Power / Battery Connections
Must be protected at a maximum of 50 A. Maximum wire size should be sized based on upstream fuse capacity. When
connecting the power source to the power studs on the module, the M5 hex nuts should be torqued to 3 Nm (22 in lb) after
installing the battery terminals to the studs. Failure to properly torque hex nuts may result damage to the unit and intermittent
operation due to terminals loosening over time.
When using a single conductor, a 35 mm² cable with a typical ring terminal thickness can be used. When using two conductors,
25 mm² cable with typical ring terminal thickness can be used. At least one turn of thread must be visible over the nut after
tightening. It is important not to fit a washer below the ring terminal as the increased resistance will cause heating and damage to
the module and cabling.
Parallel Operation
When connecting channels in parallel, it is important to match the resistance of the wires from each channel. If the wires are not
balanced, one will carry more current than the other, which may result in the channel tripping prematurely.
The best way to ensure that the wires are matched is to join them as close to the module a possible using wires of equal length
and cross sectional area. This should be 4 mm² (14 AWG) wire, no longer than 100 mm (4”). E-Plex Ltd. can supply a pre-made
assembly for this purpose. See below for the ordering code.
Loads with multiple supplies
When a channel is used to power a load, it is necessary to fit a back feed prevention diode to protect against equipment damage
when the OPM channel is off but the other channel is on. E-Plex Ltd. can supply a back feed diode with integral resister which will
protect against back feeding whilst still allowing feedback to be monitored. See below for the ordering code.
