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1. E-xpert lite display and control overview

1. Charge battery indicator
2. Alarm activated indicator
3. Numeric value indicator field
4. Readout units
5. Main battery or Auxiliary battery indicator 
6. State-of-charge bar
7. Synchronize indicator
8. Select State-of-charge readout, or next value (>)
9. Select current (A) or Amphour (Ah) readout, or enter / leave Setup menu
10. Select voltage readout (Main or Auxiliary), or previous value (<)

2. Synchronisation

In order to keep your battery monitor delivering accurate status information about your 
battery, it is important to regularly synchronize your battery monitor with your battery. As 
explained in the quick start guide, a synchronisation step is also needed before you can 
actually use your battery monitor. During operation, the battery monitor automatically 
indicates when a synchronisation is required, by displaying the message SYNCHRONIZE.

A synchronisation step means nothing more than performing a complete charge cycle on 
your battery. A charge cycle will be considered complete when all discharged energy is 
restored in the battery and both Auto-sync parameters  F02 and F03 are met during at 
least 4 minutes. This typically means : when the battery charger switches to float mode. By 
meeting these conditions, the battery is considered full, which will be indicated by a 
flashing FULL message on the display. Besides this, the State-of-charge readout will be 
set to 100% and the Amphour readout reset to 0Ah. The FULL message will disappear 
when a key is pressed, or automatically, when the battery starts discharging again.

Performing synchronisations regularly is also important to keep your battery healthy and to 
increase it’s lifetime. You will notice that if you are often performing full charge cycles 
yourselves, the battery monitor will most likely not display the SYNCHRONIZE message, 
since the battery is already kept in good sync with the battery monitor.

Besides automatic synchronisations based on meeting the Auto-Sync Functions, you can 
also manually synchronize the battery monitor with your battery when you are sure your 
battery is fully charged. This can be accomplished by pressing both < and > keys 
simultaneously for three seconds. After these three seconds, the flashing FULL message 
appears on the the display just like when it is automatically synchronized.

Before proceeding with this owner’s manual, please make 
sure you have carefully read the enclosed installation guide as 
well!

 

3. Setup menu

Using the Setup menu, your battery monitor can be adjusted to fit into your system. A 
number of parameters, called Functions, can be set according to your needs. This menu 
can be accessed by the following sequence :

When the Setup menu is entered, you can use the < and > keys to browse through the 
different Functions. By pressing the SETUP key, the selected Function value can be 
viewed. The < and > keys can now be used to change this value. Pressing the SETUP key 
again, will then step back to the Setup menu. From any menu position, the Normal 
Operating Mode can be accessed again by pressing the SETUP key for 3 seconds. This 
will also save any Function value changes to internal memory. When no keys are pressed 
for 90 seconds while operating in the Setup menu, the battery monitor will automatically 
return to the Normal Operating Mode again without saving any Function value changes.

The factory settings are based on a 12V battery system with a capacity of 200Ah. For 12V 
systems, generally only Function F01 has to be checked for correct operation of your 
battery monitor. When your battery capacity is other than 200Ah, Function F01 has to be 
changed to a value that is equal to your battery capacity. All other Functions can be left 
unchanged if you are uncertain about adjusting these values yourselves.

When your battery system is 24V, besides checking battery capacity Function F01 for the 
correct value, you should also change the values of F02 and F05. Default 24V system 
values for F02 and F05 are respectively 26.4V and 21.0V.

The following Functions are available :

F02

Charger's float voltage (

. This value must be equal to your 

battery charger’s float voltage. which is the last stage of the charging process. In 
this stage the battery is considered full.

Auto-sync parameter)

Default : 13.2V

Range : 8.0V - 33.0V

Step size : 0.1V

F03

Charger's float current (Auto-sync parameter). When the charge current is below 
this percentage of the battery capacity (see Function F01), the battery will be 
considered as fully charged. Make sure this Function value is always greater than 
the minimum current at which the charger maintains the battery or stops charging.

Default : 2.0%

Range : 0.5 - 10.0%

Step size : 0.1%

F04

Low battery alarm On (% SOC). When the State-of-charge percentage has fallen 
below this value, the alarm relay will be activated, the Charge battery indicator 
starts flashing and the State-of-charge bar is empty.

Default : 50%

Range : 0 - 99%

Step size : 1%

F05

Low battery alarm On (Volts). When the battery voltage has fallen below this 
value, the alarm relay will be activated.

Default : 10.5V

Range : 8.0 - 33.0V

Step size : 0.1V

F06

Low battery alarm Off (% SOC). When the State-of-charge percentage has risen 
above this value and the alarm relay was activated, the alarm relay will deactivate 
again. When “FULL” is selected, the alarm relay is deactivated when the Auto-
sync parameters are met.

Default : 80%

Range : 1 - 100% / FULL

Step size : 1%

F01

Battery capacity. Your Main battery’s capacity in Amphours (Ah).

Default : 200Ah

Range : 20 - 999Ah

Step size : 1Ah

F07

Peukert's exponent. The Peukert’s exponent represents the effect of reducing 
battery capacity at higher discharge rates. When the Peukert value of your battery 
is unknown, it is recommended to keep this value at 1.25. A value of 1.00 disables 
the Peukert compensation and could be used for Lithium based batteries.

Default : 1.25

Range : 1.00 - 1.50

Step size : 0.01 

F08

Shunt Amp Rating. This Function represents the Amp rating of your shunt at 
50mV. Included with your battery monitor is a 500Amp/50mV shunt, meaning that 
at 500A flowing through the shunt, a voltage of 50mV is generated across the 
small ‘Kelvin’ screw terminals of the shunt. This voltage will be used by the battery 
monitor to measure the amount of current.

Default : 500A

Range : 10 - 900A

Step size : variable 

F09

Backlight mode. Represents the duration of backlight activation in seconds after 
key-press. The backlight can also be set to be always “ON” or always “OFF”. 
Function setting “AU”, activates the backlight automatically when charge / 
discharge current exceeds 1Amp or when a key is pressed.

Default : 30sec

Range : OFF / 5…300 / ON / AU

Step size : variable

F10

Alarm contact polarity. Enables selection between a normally open (NO) or 
normally closed (NC) contact.

Default : NO

Range : NO / NC

F11

Auto-sync sensitivity. Only change this setting when F02 and F03 are set correctly 
and automatic synchronization still 

. If automatic

 takes too 

long or does 

, lower this value. When the battery monitor synchronizes 

too early, increase this value.

fails

 synchronization

never occur

Default : 5

Range : 0 - 10

F12

Firmware version. Displays the firmware version of the battery monitor (read only).

Default : x.xx

r.b

Reset Battery status. Use this reset item to reset your current battery status, for 
example after you have installed a fresh battery of the same specifications as the 
previous one.

r.F

Reset Functions. This reset item can be used to reset all Function values to 
factory default values.

The last two Functions are socalled Reset Functions. By pressing the SETUP key the 
selected Reset Function can be viewed. The default value for all Reset Functions is “OFF”. 
To actually reset the selected Function, use the < and > keys to change the value from 
“OFF” to “ON”. Pressing the SETUP key again, will step back to the Setup menu. All reset 
items set to “ON” will only be reset once the Normal Operating Mode is accessed again by 
pressing the SETUP key for 3 seconds. The following Reset Functions are available :

TBS Electronics (TBS) warrants this product to be free from defects in workmanship or 
materials for 24 months from the date of purchase. During this period TBS will repair the 
defective product free of charge. TBS is not responsible for any costs of the transport of 
this product.

This warranty is void if the product has suffered any physical damage or alteration, either 

1)

internally or externally, and does not cover damage arising from improper use  or from use 
in an unsuitable environment.

This warranty will not apply where the product has been misused, neglected, improperly 
installed or repaired by anyone other than TBS. TBS is not responsible for any loss, 
damage or costs arising from improper use, use in an unsuitable environment or improper 
installing, setup and malfunctioning of the product.

Since TBS cannot control the use and installation (according to local regulations) of their 
products, the customer is always responsible for the actual use of these products. TBS 
products are not designed for use as cricital components in life support devices or 
systems, that can potentially harm humans and/or the environment. The customer is 
always responsible when implementing TBS products in these kind of applications. TBS 
does not accept any responsibility for any violation of patents or other rights of third 
parties, resulting from the use of the TBS product. TBS keeps the right to change product 
specifications without previous notice.

1) 

Examples of improper use are :

 - too high input voltage applied
 - wrong shunt connection
 - applying battery voltage to shunt input
 - mechanically stressed enclosure or internals due to harsh handling and/or incorrect   
   packaging
 - contact with any liquids or oxidation caused by condensation

4. Warranty conditions

6. Declaration of conformity

MANUFACTURER

:

TBS Electronics BV

ADDRESS

:

De Marowijne 3
1689 AR  Zwaag
The Netherlands

Declares that the following products :

PRODUCT TYPE

:

BATTERY MONITOR

MODEL

:

e-xpert lite

Conforms to the requirements of the following Directives of the European Union :

EMC Directive 2004/108/EC
RoHS Directive 2002/95/EC

The above product is in conformity with the following harmonized standards :

EN61000-6-3: 2001

EMC - Generic Emissions Standard

EN61000-6-2: 2005

EMC - Generic Immunity Standard 

5. Technical specifications

Parameter

E-xpert lite

Supply voltage range

1)

Supply current   :

@Vin=24VDC

Input voltage range (auxiliary battery)

Input voltage range (main battery)

2)

Input current range

Battery capacity range

Operating temperature range

Readout resolution :

voltage (0..35V)

current (0..100A)

current (100..999A)

amphours (0..99Ah)

amphours (100..999Ah)

@Vin=12VDC

9..35VDC

7mA

9mA

2..35VDC

0..35VDC

-999..+999A

20..999Ah

-20..+50°C

± 0.1V

± 0.1A

± 1A

± 0.1Ah

± 1Ah

1)

 Measured with backlight and alarm relay turned off.

2)

 Depends on selected shunt. With standard delivered 500A/50mV shunt (350A

   continuous), the  range is limited to -600..+600A.

Note: the given specifications are subject to change without notice.

- E-xpert professional connection kits
- E-xpert quick connection kits

Accessories

weight

Protection class

145 grams

IP20 (frontpanel only IP 65)

height

17mm (base) / 35mm (M8 screws)

Weight

Shunt dimensions :

footprint

95grams

45 x 87mm

total depth

79mm

Dimensions :

frontpanel

body diameter

ø 64mm

ø 52mm

Current measurement accuracy

± 0.4%

state-of-charge (0..100%)

Voltage measurement accuracy

± 0.1%

± 0.3%

[3 sec]

E-lite TBS Manual Rev5en / Printed in The Netherlands

High Precision Battery Monitor

e-xpert lite

Owner’s manual

Thank you for purchasing a TBS Electronics 

Battery Monitor. 

Please read this owner’s manual for information 

about using the product correctly and safely. 

Keep this owner’s manual close to the battery 

monitor for future reference.

TBS ELECTRONICS BV

De Marowijne 3, 1689AR, Zwaag, The Netherlands

http://www.tbs-electronics.com

EN

2

3

4

5

6

7

8

1

9

10

Step size : 1

r.c

Reset zero-offset current. Use this reset item to remove small current readings on 
the display when no current is flowing in- or out of the battery. When performing 
this reset action, please be 100% sure that all DC consumers/chargers are 
disconnected or turned off.

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