SENS EnerGenius Technical Manual
6
Service hotline: 1.800.742.2326
1.303.678.7500
2. CHARGER LOCATION
Do not set a battery or any other object on top of the charger. This will obstruct the ventilation openings and cause
excessive heating. Ensure the charger is protected from blowing or dripping water.
3. GROUNDING INSTRUCTIONS
This battery charger should be connected to a grounded, metal, permanent wiring system; or an equipment grounding
conductor (earthing conductor) should be run with the circuit conductors and connected to the equipment grounding
terminal in the charger. This terminal is marked with the ground symbol. Connections to the battery charger should
comply with all local codes and ordinances.
4. NEUTRAL CONNECTION
The grounded circuit conductor (neutral) should be connected to the terminal marked “N” on the input terminal block,
TB1.
5. WIRE RATINGS
A. All conductors should be rated for use at 90º C or higher.
B. All input and output conductor sizes should be coordinated with the fault protection devices: 15A on AC input (14
AWG typical), 40A on DC output (8 AWG typical), 1 A on Alarm terminal block (20 AWG typical).
C. Before installation, ensure adequate battery to charger wire gauge. Wire gauge that is too small may activate the open
battery detector and the charger will shut down. The maximum allowed resistance seen by the charger is found in
TABLE 1. These figures already include an allowance for charger variations (they are 80% of the typical trip-point)
and are for the complete circuit: total of battery leads, battery's internal resistance, and any external equipment. The
total resistance seen by the charger must not exceed the following values:
TABLE 1
12V 24V
Maximum Resistance
36mΩ 71mΩ
Maximum Charger to
Battery Distance (Ft.)
Recommended Charger to
Battery Distance (Ft.)
AWG
mΩ/Ft.
12V 24V 12V 24V
8 0.63 24 48 7 15
6 0.40 38 77 12 24
D. To determine the appropriate cable and length, please refer to the following table:
TABLE 2
The above lengths consider the resistance of the battery and cables only and do not take into account any
additional interconnects.
The above lengths are for operation at 25C. For high temperature installations (40C) reduce lengths by 10%.
In the case of high resistance in the cables to the battery the charger may cycle between AC Fail and Battery
Fault LEDs (approximately every 10 seconds). Cable runs exceeding the proper length for the cable gauge
used most often cause this problem. The appropriate solution is to change the cable gauge to properly
correspond with the necessary cable length (see TABLE 2). In some cases where the resistance is not too far
above maximum, the charger may recover after some time (approximately 10 minutes) and start charging the
batteries. If it is not possible to decrease the system resistance the Battery Fault feature can be disabled. Please
contact SENS at 1-800-742-2326 for further information.
E. Refer to local electrical for additional requirements.
F. See Section 10 for Terminal Block wire ranges.
6. FUSE RATINGS
A. CAUTION: For continued protection against risk of fire, replace only with same type and rating of fuse.
B. DC Output Fuse – SENS part number 304532. Littelfuse 299040, 40A, 32V, Slo-Blo, blade type
C. AC Input Fuse – SENS part number 304468. Bussmann Type BK/ABC-15, or Littelfuse 314015P, 15A,
250VAC, fast acting, ferrule type cylindrical, ¼” X 1-¼”
(164 pages)
(12 pages)
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