RV Super Centre MB3940 DC to DC Dual Battery Charger User Manual

**RV Super Centre MB3940 DC to DC Dual Battery Charger User Manual

**

Important Safety Instructions

WARNING! To avoid any personal injury, please read the safety instructions below,
This battery charger is not intended for use by children or infirm persons without supervision.

FOR AUTOMOTIVE AND RECREATIONAL VEHICLE 12V DEEP CYCLE BATTERY USE ONLY. NOT TO BE USED WITH DRY CELL BATTERIES.

• During the charging process, do not use a naked flame near a battery. Batteries generate explosive gasses during the charging process that may explode.
• Never smoke or light cigarettes near a battery.
• Do not place tools on top of a battery or allow tools to fall on the battery to prevent the chance of a short circuit and sparks.
• Always wear eye protection when charging a battery.
• Ensure charging and testing is conducted in a well-ventilated area.
• Inadequate ventilation may over-heat the charger and cause in-efficient operation.
• This battery charger is not intended for outdoor operation. Do not expose it to moisture or extreme weather conditions.
• The ACID/FLUID within a battery is highly corrosive and poisonous. It can produce flammable and toxic gases when recharged and will explode if ignited. When working with batteries, always wear eye protection, remove jewellery and ensure the area is well ventilated. If spilt – it will cause severe burning to eyes, skin, clothing, damage paintwork and corrode many metals. Ensure that power is disconnected from any appliance in the vicinity of the spill and immediately wash any area that has been affected with water.

The warnings, cautions and instructions detailed in this instruction manual cannot cover all possible conditions and situations that may occur. Common sense and caution are factors which cannot be built into this product and must be supplied by the operator.

Key Charger Features

This DCDS2Ocharger is a sophisticated multi stage charger, utilising switch mode and fully automatic computerised control, designed to charge most 12 Volts AGM/Gel, Lead Acid LION and Calcium batteries.

• Heavy duty aluminium case and mounting brackets
• Microchip monitoring and control
• Fully automatic high frequency multi stage charging
• Pulse mode technology that reduces oxidation, evens electrolyte consistency and minimises temperature equating to longer battery life
• Easy push button chemistry select: AGM/Gel, Calcium,LioN,Deep Cycle, VRLA and conventional flooded Lead-Acid batteries a Internal charger temperature monitoring and power output control
• LED indicators showing state of charge
• Over charging, short circuit and over temperature protection
• Reverse polarity protection:
  1. Input reverse polarity protection
  2. Output reverse polarity protection
• Thermal overload protection
• Solar input overload protection
• Power cut memory function: once selected, the charger will remain on this battery type until it is changed

Installation Options / Instructions

Installing the Charger

Installation of this unit will require twin core wiring – and suitable cable connectors (not included). See specifications page for details.

Any existing cables used in conjunction with this charger will require checking to ensure size is suitable gauge. Where necessary replace with suitable gauge wiring if they do not meet minimum specifications.

• Locate where you are going to install the DC—DC charger. Ensure the charger is located in a suitable dry area in the vehicle or caravan.

• Ensure the charger is securely mounted using the brackets and screws provided. Charger can be mounted overhead, vertically or horizontally.

• Next, measure required cable length from the main vehicle battery through to the location of the DC—DCcharger

• Ensure Al I. cabling meets specification and will not be exposed to excessive heat/moving parts or abrasion.

• Connect the optional ACC wire to the ignition of your vehicle. This will signal the DCDC charger to start DC charging when the ignition is switch on. Note: Make sure your car engine Is running to avoid over drain on the vehicle battery.

• If the charger is located in a camper/caravan we recommend the use of an Anderson style plug between the tow vehicle and the camper/caravan as shown below.

• Fit suitable connectors on either end of the twin core cables.

• Connect the auxiliary battery to (-) shared negative and (+) charger output using twin core wiring as per recommended cable size.
  

• Using the twin core wiring laid between the main starting battery and the DC-DC charger, connect the red (+) to the (+) DC input terminal and the black (-) to the (-) shared negative on the rear of the charger. Finally, make the power connections to the main starting battery of the vehicle. It is recommended to install a 25 Amp drcult breaker (not included) as shown on main diagram. The circuit breaker should be located dose to the starting battery.

• Check all connections are tight.

**Suggested fitment to vehide only

Suggested fitment to Vehicle with caravan
**

“SMART ALTERNATOR” VEHICLES ONLY NOTES ON USING ACCESSORY (ACC) WIRE.

With most vehicles this wire is not necessary, The MB3940 is designed to detect when the vehicle’s engine is running by the increase in voltage across the starting battery as the alternator starts charging. The ‘ACC” connection may be required for newer vehicles that use “Smart” alternators. These only charge the starting battery when its charge fats below a predetermined level or the current being drawn exceeds a certain level. In many cases, if you ensure that the black (negative) wire is connected to the vehicle chassis (Instead of the starting battery negative terminal), this problem will not occur. Alternatively, with many vehicles, the Smart Alternator function can be disabled, either as a user-selected function, or by Your dealer. (Please refer to your vehicle’s manual). Although it says “ACC,” with petrol engines it would be better connected to the actual ignition line.

Operating The Charger

CHARGER DISPLAY

1. DC BATTERY
   Once correctly installed, the DCDS20 charger is a simple set and forget dual battery switch.

   • Start the vehicle and let it idle,
   • The charger will now recognise that there is charge being applied to the main starting battery.
   • Once the main starting battery has reached 13.0 volts the charger will begin to charge the auxiliary battery.
   • The initial default setting is for AGM/Gel batteries.
   • If you are charging a battery with a different chemistry simply change the battery type by pressing the battery type selector button on the front panel of the charger.
   • Once selected, the charger will remain on this battery type until it is changed.
   • The charger will continue to operate even after the vehicle has been switched off, however once the main starting battery falls below 13.0 volts the charger will automatically shut off.

2. Solar Input
   Once correctly Installed, the Dcos20 charger is a simple set and forget dual battery switch.

   • Once connect the input terminal with solar panels positive and negative, the charger will transfer to solar charge mode.
   • If you are charging a battery with a different chemistry simply change the battery type by pressing the battery type selector button on the front panel of the charger.
   • Solar charging requires an input of 16 to 25volts from solar panels. When available solar panel voltage falls below 16 volts no charge will be delivered to auxiliary battery.

Specifications

Model: DCDS20

TYPe: Multi Stage
Input:| DC Battery:12.4 – 16.0 Volts
Solar Input: 16.0 – 25.0 Volts
Output! Charging Voltage:| 13.5 -15.4 Volts (Stops charging when alternator output or vehicle battery below 13.0 Volts)
Output Current:| DC0S20| DC Output: 20A
Solar Output: 20A
Minimum Start Voltage:| 2.0Volts – For battery being charged
Charge Control
Soft Start:| Yes
Soft Charge Current:| DCD520 ‘Li 20A
Bulk Charge Voltage:| 14.7V (AGM/Ge1)14.4 V (Lead Acid)15.4V (Calcium) 14.4VtLION)
Absorption:| Constant voltage with automatic amperage control
Equalisation:| Automatic
Float Charge Voltage:| 13.5V (AGM/Ge1)13.5V (Lead Acid)13.SV (Calcium)
Float Charge Current:| 100mA
Battery Range:| 18 to 250Ah
Cable Length / Twin Core
0 -1 Metres:| 12 AWG
1- 5 Metres:| 8 AM
5 Metres +:| 6 PUG

WARNING! Failure to use recommended wiring will severely impact on performance of DC to DC charger.

Charging Voltage

NOTE: Battery manufactures sometimes specify charging voltages. Not observing their charging instructions may void your battery’s warranty.

Additional Information

Deep cycle batteries It is expected that this charger will be used to charge a ‘deep cycle’ type auxiliary battery. Deep cycle batteries are designed to provide battery power to run items like fridges and lighting in caravans and campers.

It is generally accepted that the life of a deep cycle battery can be extended if it is not discharged below 50% of its full capacity. A fully charged 100 amp battery in good condition should offer 50 amp hours of power without impacting on its normal life expectancy.

Your average compressor style fridge uses up to 5 amps. Over a 24 hour period it should use approximately 24 amp hours. Therefore if the 100AH battery is operating only the fridge (and receives no additional charge) it ideally will require recharging after 48 hours.

To replenish these 8o amp hours using a 2oamp DC- Daharger will require at least 5 hours of driving. A twenty amp unit will require at least 2.5 hours of driving to fully recharge the battery. Undercharging a battery and discharging to below SO% can severely impact on life expectancy of most deep cycle batteries.

Distributed by:
Electus Distribution Pty. Ltd.
320 Victoria Rd, Rydalmere
NSW 2116 Australia
www.electusdistribution.com.au
Made in China

Fault Finding

• Charger won’t indicate
  • Charger not connected to battery. charging.
  • Check terminal connection.
  • Battery is not 12V.
• Battery won’t charge.
  • Verify that all wiring meets specifications.
  • Check condition of batteries.
  • Check performance of alternator.
• Battery won’t fully
  • Batteries that are over 3 years old; severely discharged charge or hold charge. (or previously been severely discharged); not regularly recharged; over-heated; low in electrolyte; undercharged; overcharged or sulphated may not accept or hold a charge. A good automotive store or battery outlet often offer a free or low cost in store service to check condition of battery. Your battery may require replacement

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