Solar Panel Charge Controller. 8 Amps. 125 Watts. SB0


Low cost solar panel charge controller for use with solar panels up to 8 amps (125 watts)

Compact design with three stage charging: Bulk, Absorption and Float modes

Bright LED’s indicating solar current and battery state

SunWorks PWM technology: Prolongs battery life

Protects batteries from overcharge

Fully automatic

For all 12 volt battery systems


Out of stock


Low cost solar panel charge controller.

SunWorks solar panel charge controller SB0. Combining high performance, fully automatic battery charging and protection.

The SB0 is fitted close to your battery using two small screws.  One pair of wires connects the controller to the battery and one pair connects to the solar panel. This completes the installation.

  • Designed specifically for motorhomes, boats and caravans.
  • Fit and forget. Silently optimises the charge from your solar panel
  • Very low self-consumption. Suitable for use with most small to medium size solar panels
  • Suitable for all 12 Volt leisure and engine batteries. Liquid or gel types
  • Two bright LED’s indicate battery charge level and solar charging mode
  • Intelligent 3-stage PWM 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 battery once it is fully charged
  • High efficiency SunWorks PWM Precision technology
  • Attractive, compact design
  • No setting up routine
  • Proven high reliability
  • All British design

 SunWorks Solar Panels that suit the SB0 solar panel charge controller:

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

Installing a solar panel charge controller is straightforward for any competent DIY person. Each controller comes with complete illustrated instructions.

Here are the basics. See the diagrams below:

  • The controller is mounted inside the boat or vehicle, close to the battery.
  • A 2-core cable passes through the roof or deck to connect the controller to the solar panel.
  • Another 2-core cable connects the controller to the battery via a suitable fuse.

Typical connections for a motorhome or caravan:

Wiring for single battery_motorhome


Typical connections for a yacht or narrowboat:

Wiring for single battery_boat


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

Wiring accessories:

To help install the SB0 solar panel 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 0.25 kg


Maximum solar panel current

8 Amps

Maximum solar panel power

125 Watts

Battery operating voltage (nominal)

12 Volts





Controller weight

100 grams

Charge modes

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

Recommended wire type

2.5 mm sq. automotive cable

Connection type

2-5-mm-sq-automotive-cable, Screw terminals

Solar panel maximum Voc

35 volts

Operating temperature

-15 degC to +50 degC

Storage temperature

-25degC to +60degC

Environmental protection



  1. S. Sprague (verified owner)

    I purchased a flexible 50watt solar panel and controller, which I installed on the roof of my campervan. It works great, my leisure battery is always topped up, allowing me to recharge phones, laptop, AA batteries, camera, run van lighting etc, even while parked-up several days, as at festivals. Tony was very helpful when I ordered the kit, I called him a few times to ask advice on installation as well as choosing what to order. In all a 100% satisfactory experience. Thank you

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