Magnum Energy M-RC, Owner'S Manual

© 

2010 Magnum Energy, Inc

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10

BULK 

(yellow)

 - 

• On (solid) – Bulk Charging; the charger is delivering maximum 

current to the batteries. The charger will remain in Bulk Charge 

until 14.6 VDC* is achieved (per Battery Type selection**).
• Blinks On (1 time every 4 seconds) – Charger Back-off; charger 

current is reduced. This occurs if: 1. The internal temperature is 

very hot (charger reduces charge rate to maintain temperature) or, 

2. The AC input voltage has fallen below 85 VAC (charger reduces 

charge rate to help stabilize the incoming AC voltage).

• Off – 

charger is not in Bulk Charge mode.

ABSORB 

(yellow)

 - 

• On (solid) – Absorb Charging; the charger is in constant voltage 

stage and begins after the bulk voltage has been reached. The 

DC charging current will start to taper down to maintain the bulk 

voltage setting. The absorb charging time is 120 minutes (per 

Battery AmpHrs selection**).
• Blinks On (1 time every 4 seconds) – Charger Back-off; charger 

current is reduced. This occurs if: 1. The internal temperature is 

very hot (charger reduces charge rate to maintain temperature) or, 

2. The AC input voltage has fallen below 85 VAC (charger reduces 

charge rate to help stabilize the incoming AC voltage).
• Off – charger is not in Absorption Charge mode.

FLOAT 

(green)

 - 

• On (solid) – Float Charging; at the end of the absorb charging 

time, the charger reduces the charge voltage to maintain the 

batteries at 13.4* VDC (per Battery Type selection**).
• Blinks On (1 time every 4 seconds) – Charger Back-off; charger 

current is reduced. This occurs if: 1. The internal temperature is 

very hot (charger reduces charge rate to maintain temperature) or, 

2. The AC input voltage has fallen below 85 VAC (charger reduces 

charge rate to help stabilize the incoming AC voltage).
• Blinks On (2 times every 4 seconds) – Full Charge; monitors 

the battery voltage to determine when to continue charging. After 

four hours in the Float Charge mode, charger turns off and goes 

to Full Charge mode. If the battery voltage drops to 12.9 VDC, the 

charger will automatically initiate another 

fl

 oat charge.

• Off – charger is not in Float Charge mode.
* These voltage settings are based on the BTS being disconnected; 

if connected, these voltage settings will increase or decrease 

depending on temperature around the BTS – this ensures correct 

charging.
** These settings are preset by the inverter or the connected 

remote (see Table 1, Inverter and Remote Settings), but can be 

changed by the ME-RC50 remote. 

3.0 Operation