Dual Battery Solar Charge Controller. 11 Amps. 170 Watts. Black. DB1C


Dual battery charge controller. Charge your leisure battery and your engine battery with one solar panel

Prolong battery life with SunWorks precision Duo technology

New ‘Winter’ mode. Automatically prevents either battery from discharging during long storage periods

Protects both leisure and engine batteries from overcharge

Looks smart in your living space. Clear LCD display shows the solar current and both battery levels

Cables can enter from the back or from the side. No unsightly wiring

Fully automatic. For all 12 volt battery systems. Also available in light grey


Out of stock


Dual Battery Solar Charge Controller with LCD Display.

SunWorks DB1C dual battery charge controller with LCD display. For solar panels up to 11 amp (170 watts).

  • Optimal charging of both engine and leisure batteries, from one solar panel.
  • Precision Duo system specially designed for motorhomes and boats
  • Prolongs battery life through SunWorks enhanced pulsed charge system
  • Includes our new ‘Winter’ mode. This automatically prevents either battery from discharge in low-light conditions:
    • Great for motorhomes and boats stored for long periods. Especially those with active alarm systems
  • Fully automatic.  No setting up routine
  • Intelligent 3-stage precision Duo charging:
    • ‘Boost’ mode to take full advantage of the available sunlight
    • ‘Absorption’ mode to maximise charge levels, and prolong battery life
    • ‘Float’ mode to maintain the batteries once they are fully charged
  • Large clear LCD display provides continuous reading of the solar current and both battery voltages
    • ‘See’ your solar panel working
  • Available in black or light grey to enhance the interior of any motorhome or boat.
  • Cables can be concealed. All cables can enter from the back, or from the side, of the controller
  • Attractive, compact design
  • No visible fixing screws
  • Can accept solar panels of up to 170 watts, 11 amps
  • Suitable for all 12 Volt leisure and engine batteries. Liquid or gel types
  • Proven high reliability. Five year guarantee

SunWorks solar panels that suit the DB1C dual battery solar charge controller:

We can supply rigid aluminium-framed panels, semi-flexible panels and marine grade solar panels. For example:

Installation information for use with a dual battery solar charge controller:

Installing a dual battery solar charge controller is straightforward for the competent DIY person.

Each controller comes with complete illustrated instructions. Here are the basics:

  • The controller is mounted inside the boat or motorhome where it can be seen by the user.
  • Mount the unit such that the cables can pass through the back or the side of the controller. A bulkhead or cupboard side are suitable places.
  • A 2-wire cable must pass through the roof or deck to connect the controller to the solar panel.
  • A 2-wire cable must connect the controller to each of the two batteries via a suitable fuse.

Typical connections for a motorhome:

Typical connections for a boat:


Below we list some useful accessories that will ease the installation of your solar panel system.

Wiring accessories:

To help install this dual battery solar charge controller on your motorhome or boat, we recommend the following items:

Other useful accessories:

To make a secure and watertight connection through the roof of your motorhome or the deck of your boat:

If you need any further help or advice concerning this product, please do not hesitate to contact us: [email protected]

Additional information

Shipping Weight 0.3 kg


Maximum solar panel current

11 Amps

Maximum solar panel power

170 Watts

Battery operating voltage (nominal)

12 Volts


110 mm x 85 mm x 35 mm



Controller weight

210 grams

Charge modes

Boost (bulk), Absorption (PWM), Float (PWM), Winter

Recommended wire type

2.5 mm sq. automotive cable

Connection type

Screw terminals

Solar panel maximum Voc

35 volts

Operating temperature

-15 degC to +50 degC

Storage temperature

-25degC to +60degC

Display resolution

0.1 (10th’s) for volts and amps

Environmental protection



  1. A.Sant (verified owner)

    I purchased the complete kit from Sunworks, the dual controller, 80w panel, cable mounts and sealant/glue. You need to have some DIY skills to install yourself and I checked with Auto-Sleeper on where and how to best fit the panel on the roof of my Devon.
    The UK Sunworks technician was very helpful with advice too.

  2. M Wood (verified owner)

    I recently purchased a 2 channel voltage regulator for my motorhome from SunWorks to replace the single channel unit already installed, this was a like for like swap.
    I installed it so the solar panel on my motorhome could keep my motor battery charged as well as the leisure battery. I also purchased the wiring accessories needed to connect the unit up.
    The service I received was excellent guiding me to the correct unit and advising which accessories I would need to correctly install the unit.
    Once installed the unit immediately started to charge the two batteries.
    I would highly recommend the SunWorks the company for the excellent products and above all the customer service I received from them.

  3. M. Anderson (verified owner)

    I would just like to take the time to thank you and your team for the prompt response time and quality solar panel and charge kit I purchased.
    Instruction provided for fitting was clear and fitting kit more than adequate making a complete novice like me feel like a professional.
    I have just returned from a three-week trip where it performed faultlessly.

    Many thanks


  4. A. Hall

    I needed a regulator for a 140W panel that I bought for the motor home. I was keen on having the ability to charge both the leisure and the engine battery so they are both maintained particularly during the winter. I wanted to mount the regulator next to the existing electrical panel and therefore having the cables connecting from behind was important, and as a retired engineer keen to have the actual status of the batteries, the amount of charge and the operating mode of the regulator clearly displayed is just brilliant. Have just returned from our first trip and everything worked as expected. It was easy to fit, a couple of questions I had regarding the operation of existing built-in chargers were confidently answered by Sunworks. It is one of the best things we have added to our motor home. it is attractive and discrete, informative and performs well.

  5. AMC

    I’ve had this controller for just over a month now fitted to my Motorhome, and I’m really pleased with it. Its June and the sun is shining bright every day, I have been monitoring the controller and its really looking after both the Leisure and Starter battery. Prior to purchasing I had done some research on solar controllers and had pretty much decided between two different manufacturers. What swayed me in favour of Sunworks was how helpful their Technical Rep was. The UK technical specialist was very helpful and put me straight on a few things I was unaware of. With a backup service like that, I decided I would buy Sunworks.

  6. S Copeland


  7. N D

    Controller works well and let’s you monitor both leisure and vehicle battery at the same time.

  8. Billykate

    Using this with my 120 watt solar panel. Keeps both batteries charged in the summer and seems to maintain them well during the winter. Looks great in my motorhome and I am very happy with it. Straight forward to fit.

  9. G Cran

    An excellent piece of kit , I have had one for 2 years on my Autotrail MIAMI without any problems . If you need help or advice Tony Weldon of Sunworks will go the extra mile to help you ,just contact him at [email protected]

  10. R Goodwin

    I had the Sunworks SB1C fitted to my Chausson CamperVan a few months ago, and it has performed perfectly. Before fitting, I had no problems with the leisure battery, but the engine battery was losing charge over long periods of non-use. Now, with the DB1C, both batteries are being topped up constantly, with NO involvement from ME – also very useful to see the state of both batteries on the clear display. Very impressive!

  11. F Broughton

    My engine battery went flat very shortly after I fitted a new head unit in my T5 Campervan … I have a 100watt Solar panel with a cheap single battery controller… I replaced it with this Sunworks Dual Battery Controller… Absolutely delighted with the result… It is so simple to install, cable to each battery and one to solar panel.. it is fully automatic, with several charge modes which it works out what mode is needed itself.. the display shows the charge state of each battery and the amount of charge plus the mode it is using at the time..no more flat batteries… I highly recommend this to any camper who has a solar panel and 2 batteries….

  12. H Avalle

    I have just upgraded from the Sunworks SB1C to the DB1C so that I can charge my engine battery as well as my leisure battery from the same solar panel. This is my third motorhome and my third Sunworks controller and I thoroughly recommend this product.

  13. I Salsbury

    Upgraded my previous single battery controller to one of these so that both my leisure and engine batteries are kept fully charged. Fabulous support from Sunworks. Well recommended.

  14. D Durling

    Following problems with an earlier single battery controller which appeared to give false readings, I decided to fit my boat with a controller for the solar panel that would treat both batteries (engine and domestic). A main criterion was that I wanted something that would just do the job without my intervention – I didn’t want any difficult setup procedures and I didn’t want to programme anything. The Sunworks DB1C seemed to fit the speci OK. No problem to install, easy to understand, and my batteries are kept at float charge when I’m away from the boat. It works very well.

    I have nothing but praise for the product.

  15. C Jones

    I have recently fitted a solar panel (150w) to my motorhome so to avoid flat batteries over the winter period & eliminate any worries with it starting after along period parked up, used a recommended installer for the installation with which they used a SunWorks digital controller. Excellent I love it shows me amps going to panel & voltage on both leisure batteries & cab battery.
    My mate has a solar panel on his caravan which just gives lcd lights(green/red) but he has no information on the power from the panel or what charge is in his batteries !

    Would recommend this controller to any Motorhomer.

  16. A Keaveny

    The Sunworks Controller shows at a glance the Voltage of the battery and also the Amperage of the current from the solar panel, at a glance. I had one in my previous Rapido Motorhome, for 6 years and I am now changing the regulator which came with my new Rapido for a Sunworks. The 11 amp model should be enough, but if you have multiple solar panels, and winter in Morocco as I do, buy the 15 amp for the extra few pounds well worth it.

    It is also the best looking regulator I have seen.

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