Charging
The MULTI XT 4000 charges and analyses in eight fully automatic steps.
- Desulphation
Desulphation with pulsing for sulphated batteries. - Start
Starting phase for charging. The starting phase continues until the battery’s terminal voltage has risen over a preset level. At this point, charging goes into the bulk phase. If the terminal voltage has not reached the preset level within a preset time, charging is suspended. The error mode is indicated. This indicates a battery which is faulty or has too large capacity. If a large battery is charged that has been severely discharged, it may be necessary to restart the charger after a preset time. - Bulk
Primary charging where approximately 80% of the charging takes place. The charger delivers maximum current until the terminal voltage has risen to the preset level. After a number of hours, the charger goes on to the next phase, even if maximum voltage is not reached. - Absorption
Final charging, voltage is kept at the preset level. During this phase, the current is gradually reduced. If the maximum length of time for Absorption is exceeded, the charger automatically continues with Analysis. - Analysis
Charging is suspended for a short period and the battery voltage measured. If it falls too quickly, the battery is probably faulty. Charging is suspended and an error is indicated. - Recond
Recond is used to recover severely discharged flooded batteries and for reconditioning severely discharged batteries suffering from stratification. The voltage increases with reduced current for a limited time period (depending on the charge level of the battery at start). The higher voltage starts some gassing and mixing of the acid, which is beneficial for both battery capacity and expected life. The battery could emit explosive gas during this step. - Maintenance charging - float
During the first 10 days of maintenance charging the battery is maintained with constant voltage. - Maintenance charging - pulse
State of charge varies between 95% and 100%. The battery receives a pulse when the voltage sinks, keeping the battery in good shape when it is not being used. The charger can be connected for months at a time. If the battery is charged and/or the battery’s terminal voltage drops, the charger starts a charge pulse until the voltage has reached the preset level. The charge pulse is then interrupted and the cycle is repeated as long as the charger is in pulse maintenance phase. If the terminal voltage drops even lower, the charger automatically reverts to the beginning of the charging curve. If possible, check the water level in the battery.
Using the MULTI XT 4000 gives your battery an optimum service life and operational reliability.
Batteries
The MULTI XT 4000 can be set very easily to charge different types of lead-acid batteries (Wet, MF, GEL and AGM) and conditions. You will find an explanation of the various battery types under Charger University, Battery Types.
The MULTI XT 4000 charges a wide range of battery sizes, from 8Ah to 100Ah (up to 250Ah maintenance).
| SETTINGS |
EXPLANATION |
| NORMAL |
Normal setting for wet batteries, MF and for most Gel batteries. A somewhat lower charge voltage may be preferable for some GEL batteries. |
| Snowflake |
This setting is recommended for charging batteries at temperatures lower than -5 degrees C. It is also suitable for many AGM batteries. |
| RECOND |
This mode is used to recover severely discharged batteries where you might expect stratified acid (high acid weight at the bottom, low on top). Use this mode with care, as the high voltage may cause some water loss. 32V is normally no problem for electronics in 24V systems, although maximum effect and minimum risk for electronics is achieved by disconnecting the battery. |
| BULK CHARGE TIME |
| BATTERY SIZE (Ah) |
FOR ABOUT 80% CHARGE (h) |
| 8 |
2 |
| 20 |
5 |
| 60 |
14 |
| 100 |
20 |