12V solar panels charging kits for caravans, motorhomes, boats, yachts, marine

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DC to DC Battery Chargers

30A 12V DC to 12V DC automatic multi-stage intelligent battery-to-battery charger for lead acid or lithium batteries

30A 12V DC to 12V DC automatic multi-stage intelligent battery-to-battery charger for lead acid or lithium batteries
30A 12V DC to 12V DC automatic multi-stage intelligent battery-to-battery charger for lead acid or lithium batteries

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Ex. VAT £133.33
Inc. VAT £159.99
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We are proud to offer this 30A DC-to-DC battery charger, from the leading German solar electronics manufacturer, Votronic. German design, engineering and manufacturing ensure unrivalled quality and reliability.


This intelligent battery charger is designed to automatically charge one 12V battery / battery bank from another 12V battery / battery bank with its own energy source. For example, if one 12V battery / bank is being regularly charged by solar / mains/ alternator, this 30A DC-to-DC battery charger can pull energy from this battery bank to charge a second 12V target battery or battery bank. The target battery / bank will be charged at a maximum of 30A, using an intelligent multi-stage approach with full overcharge protection.

This compact and lightweight battery to battery charger can be easily integrated or retrofitted into any 12V system, allowing the user to transform a single battery system into a dual battery charging system. For example, in a vehicle or boat this charger can take energy from the engine starter battery (which is constantly topped up by the alternator) to charge a leisure or auxiliary battery / bank.

In a solar charging system, the charger allows easy conversion from a single battery solar charging kit to a dual battery charging kit, without the need to upgrade the single battery solar charge controller to a dual battery model. This is perfect for systems with a high solar input, where a capable dual battery solar charge controller is expensive or difficult to procure.

Key features:

  • Safe unattended charging: the unit features inbuilt safety functions (protection against overload, overheating, overvoltage, short circuit, incorrect polarization and reverse discharge of the battery), which allow the charger to be left permanently connected to the source battery for unattended automatic charging.
  • Continued charging during battery/load use: the charger will continue to operate at full power whilst energy is drawn from the battery during use. The unit will maintain the charge if the battery is already at full capacity. Any 12V loads may also be left permanently connected and running whilst the DC-to-DC charger is in operation, and will be protected against overvoltage and voltage fluctuations.
  • Compatible with other charging sources: thanks to the inbuilt suppression filter, the batteries may be charged from alternative power sources, for example solar panels / petrol generators etc., whilst remaining connected to the battery charger.
  • Reverse charging during vehicle inactivity - the charger is able to detect when the source battery has become more drained than the target battery. To rectify this, it will trickle charge the source battery back from the target battery at a max charging current of 1A.  For instance, in situations where the vehicle has been left stationary for an extended period of time, e.g. whilst in storage / during winter, while the source battery has been left connected to another charging source , e.g a solar system.
  • Dead battery recovery function: for optimum charging of completely drained lead-acid batteries, the charger offers a gentle preliminary charging stage, followed by a more powerful charging stage.
  • Vehicle battery optimisation: specifically designed with efficient vehicle battery charging in mind. Unlike other chargers (or split charge relays) which do not instantly charge the battery at full current whilst driving and do not provide overcharge protection, this unit will automatically charge at full power, even during short journeys, with full protection from overcharging the target battery. This charger is also well suited to vehicles of Euro 6 emission standard and above, as it prevents the reduced or intermittent charging associated with smart alternators in these vehicles.
  • Battery temperature sensor: the external temperature sensor supplied with this charger monitors the temperature of the source battery and transmits this data to the charger, which will adjust charging settings accordingly. For example, for lead-acid batteries, the charger will automatically adapt the charging voltage upon detection of a low ambient temperature, and will also refrain from unnecessary battery gassing during high temperatures. For lithium iron batteries, the battery protection function will be activated during abnormally high or low temperatures.
  • System upgrade potential: this unit may be connected in parallel to an identical model in order to boost the charging capacity of the system. This is an ideal option for large battery systems, or those with powerful 12V appliances running directly from the batteries. A second unit may be added at any time for future system expansion.


Additional features:

This charger also features LED indicators to show target battery charging status, various charging stages and battery temperature status. This unit also features an internal fan to prevent overheating.


This DC-to-DC battery charger is suitable for use with any 12V lead acid or lithium batteries, with a capacity of 50Ah or greater. It is not compatible with 24V batteries or a combination of 12V and 24V batteries. Compatible with the VLCD-VCC remote display.

Click on the 'Details and Specifications' tab for more information about this product.



  • Nominal operating voltage: 12V
  • Charging current: 0-30A
  • Battery types: suitable for any type of 12V lead acid or lithium battery
    • Min. capacity: 50Ah
    • Recommended capacity: 60-200 Ah
    • Max. capacity: 260Ah
  • Input voltage range (Euro 6+): 10.5-16.5V
  • Overvoltage disconnect (Euro 6+): 16.5V
  • Max. power consumption: 490W
  • Temperature range: -20 to +45 C 
  • Ambient conditions, humidity: max. 95% RH, no condensation
  • Dimensions: 146 x 67 x 40 mm
  • Weight: 280g


This product is covered by a 2 year manufacturer warranty. For more information please refer to our Terms and Conditions.



Full details explaining wiring and operations can be found in the user manual supplied with this product (see Documents tab).

If you need help with installation or have any technical questions we can provide FREE support - please contact us by email or phone (see Contact Us page for more information).




The following documents are available to download:

User manual for 30A DC to DC battery charger (VCC1212-30)