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Charger operation

The RTIC-2120-WP is fully automatic once installed properly. 

The LED indicator lights inform the user of the progress of  the 

charging cycle and confirm proper connections.     

Electrical characteristics

LED indicators

 Charging mode:  Indicates the state of charge of the battery. 

The green Float light indicates the battery is fully charged.

 Charging current LEDs indicate amount of current.

 AC Power On LED indicates AC power is applied to the 

charger.

 Charging status LED indicates the output is connected 

properly to the battery and is being charged.

Protection modes

Over temperature: 

The unit inhibits until it cools off and then 

restarts automatically. This is indicated by the AC Power and 

Float LEDs flashing. In very high ambient temperatures, it is 

possible for the non-auto reset thermal protection to activate. 

This is indicated by the AC Power on and 14-20 Amp Charging 

Current LEDs flashing. If this occurs, the AC power should be 

disconnected and reconnected once the charger has cooled off.

Over voltage:

 Activates in the event of a regulation malfunction 

and inhibits the charger. An over voltage condition is indicated 

by the AC Power On and Fast LEDs flashing. If the over voltage 

persists, the factory should be consulted. 

Optional relay contacts

Up to four relay contacts are provided depending upon the op

-

tion purchased. The relay specification is available on our web 

page. Please observe relay specifications in order to maintain 

proper operation.

Optional temperature compensation

The temperature compensation pod can be tie-wrapped to the 

charger cable in the immediate vicinity of the battery or wall 

mounted. Standard compensation is 15mV-18mV per degree 

Celsius per cell or factory programmable upon request.

Please read the entire installation manual before installing 

the battery charger.  If there are any questions or concerns, 

please email us or call our toll-free number given below.
The RTIC-2120-WP is a rugged, waterproof and sophis

-

ticated three state lead-acid battery charger.  With a wide 

operating temperature range and UL/CSA1236 certifica

-

tion, this product is especially suited for high end industrial 

applications and severe environments.

The RTIC-2120-WP is factory programmable to accom-

modate several charging algorithms, an LED display to 

indicate status, and optional four relay contacts to indicate 

various scenarios.  Temperature compensation is imple

-

mented digitally allowing accurate and noise free sensing 

up to a distance of 300 feet eliminating problems associ-

ated with conventional analog solutions.
The charging algorithm, LEDs, and relay control signals 

are generated by an embedded microcontroller that con-

tains software developed by and proprietary to Chargetek.  

The RTIC-2120-WP precisely controls charging voltage 

and current to ensure a complete recharge every time.  

The charger may be left connected indefinitely to the bat

-

tery, maintaining a full charge. 

 RTIC-2120-WP

Installation Manual

Optional signal connector

Outline and mounting

  

Chargetek

 409 Calle San Pablo, Unit 104, Camarillo, CA 93012 

 ~  Phone: (866) 482-7930  ~  Fax: (805) 482-7936

www.chargetek.com

LIMITED WARRANTY

For two years from date of purchase, Chargetek Inc. will at its discretion repair or replace for the original consumer, free of 

charge, any part or parts found to be defective by Chargetek in workmanship or material. All shipping charges under this 

warranty must be paid by the consumer. Proof of purchase is required.

There is no other expressed warranty. Implied warranties, including those of merchantability and fitness for a particular 

purpose are limited to two years from the date of purchase. This is the exclusive remedy and consequential damages are 

excluded where permitted by law.

SIGNAL

DESCRIPTION

AC Fail

AC < 170VAC

DC High

DC > 15.5VDC

DC Low

DC < 12VDC

Over Temperature

Unit shutdown, automatically restart

PARAMETER DESCRIPTION / CONDITIONS

MIN

NOM

MAX UNITS

V

FSTERM

Fast charge voltage, 25C

14.4

14.5

14.6

VDC

V

FLOAT

Float voltage, I

OUT 

< 1.0 A, 25C

13.2

13.4

13.6

VDC 

I

FS

Fast charge, V

BATTERY

 = 12V

20

21

22

Amps

I

FLTERM

Float charge termination current

3.2

3.4

3.6

Amps

V

AC

RMS AC voltage range

180

220

270

VAC

I

SBY

Standby current, AC off

 

0.5

ma

Dimensions in inches

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