Sargent DX320 12V-12V 20A DC-DC Charger

  (2 Reviews)
Price:  £135.22   (£112.68 Exc. VAT)

Product code:  P02920
Brand:  Sargent
Voltage  12-12V
Current Rating  20A



5 in stock

Note: Cables not included. Please download installation instructions to determine correct cable size and fuses for your application.

The DX320-12 is the brand new 20A DC-DC-charger from Sargent and is the perfect solution if you plan to use one of Sargent's Power Control Systems (such as the EC155 or EC328) in Euro 5 or Euro 6 vehicles that have smart alternators. This unit will maintain a constant charge to your leisure battery regardless of the voltage supplied by the smart alternator, giving you peace of mind that you are maximising the opportunity to charge whilst driving to your destination.

It will also work just as well with standard alternators found in Euro 4 vehicles and earlier and will, in fact, provide a much deeper charge than can be achieved by charging directly from the alternator via a Voltage Sensitive Relay (VSR). We now recommend DC-DC chargers for all installations due to their superior performance and efficiency compared with VSRs.

Designed by Sargent to be easily installed alongside their Power Control Systems, this 3-stage automatic charger is straightforward to fit and the charging profile is selectable to allow you to charge any battery type (wet lead-acid, Gel, AGM & lithium). It has a range of features built in to protect both vehicle and leisure batteries, including over-current, over temperature, over-discharge and reverse-polarity protection. It is fully automatic and keeps your vehicle and leisure batteries separated when the engine is off, so you starter battery is always preserved for engine starting.

A 'start' signal connection is required to be made to the alternator D+.

This unit is suitable for use as a standalone DC-DC charger and does not have to be used with Sargent's Power Control Systems. You can also use the majority of the other DC-DC chargers from our range with the Sargent Power Control Systems (for example, if you wanted a DC-DC charger with built in MPPT solar controller). Please contact us for more information.

  • Input voltage range: 10.5-16V
  • Output voltage range: 13.5 -14.8V
  • D+ signal voltage range: 8 - 16V
  • Battery minimum voltage for charger to activate: 8V
  • Output current: 20A (max)
  • Output power: 260W
  • No. charging stages: 3 (Bulk - Boost/Absorption - Float)
  • Battery type suitability: Wet lead-acid, Gel AGM, LiFePO4, Lithium Ion
  • Battery type selection: Dip switches
  • Charging operation indicators: 4 x LEDs
  • Leisure battery over-voltage protection: Yes
  • Leisure battery under-voltage alarm: Yes
  • Vehicle battery under-voltage protection: Yes
  • Current overload protection: Yes
  • Reverse polarity protection: Yes (2x internal 30A ATO fuses - user replaceable)
  • Over-temperature protection: Yes
  • Standby current draw: 17mA (max)
  • Cable connection type: Screw clamp
  • Max. cable size for battery connections: 16mm²
  • Overall dimensions: 147 (H) x 118 (W) x 41 (D) mm
  • Operating temperature range: -20 to +50°C

Part Number:  DX320-12

Average Rating (2 Reviews):  
Write a Review and share your opinions!

Brilliant kit
19 April 2023  | 

I purchased this system after being mis sold a split charge relay from another company that didnít work!
The guys at 12volt talked me through what I needed cable size etc, now getting 13.98v charging at the leisure battery, with confidence that nothing will overheat or over charge! 100% recommend this product!


Thank you for taking the time to leave this review Shaun, it is much appreciated!

Extra work for Euro 5 and above
16 March 2023  | 

I am sure this will be a great addition to my camper when up and running but have come up against some unexpected additional wiring requirements within my Power Supply Unit (PSU) that were not made clear in the advertising. I tried to keep things simple and chose this Sargent DC-DC charger to compliment my Sargent EC155 PSU, thinking it would be a simple, 'plug and play'. Not so. Whilst it clearly stated it was designed for up to the Euro 4 'normal' alternator, it did not make clear the full extent of the work for Euro 5 and above. The vehicle alternator on my 2013 Mercedes Sprinter is an, 'on demand' or, 'smart' one that requires some internal re-wiring of the PSU so that the internal charger within the unit does not interfere with the charging characteristics of this newly fitted DC-DC charger. I can't do it so the services of an auto electrician and accompanying time delay beckon.

Not the end of the world, and the staff at 12V planet have been great, but it was unexpected and disappointing. Despite this, I don't regret the purchase and look forward to getting it up and running.


Founded in 1991, Sargent specialises in designing and manufacturing complete electrical systems for campervans, motorhomes, caravans and other leisure vehicles. Sargent is best known for its all-in-one kits which are extremely popular amongst professional and DIY converters alike for their integrated, plug-and-play designs.

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CALL Sales & Support: 01844 885100
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