Solar Panel Charge Controller. 20 Amps. 320 Watts. SB3Z


SunWorks solar panel regulator SB3Z. Great for mid-range solar panel installations on Motorhomes, Boats and any 12V system

For Solar Panel Arrays of up to 20 amps (320 watts)

Can be used with the SunWorks Remote Display Unit

High performance at a very low cost

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

LED indicates solar current


Out of stock


Solar panel regulator SB3Z

The SunWorks solar panel regulator SB3Z is a high performance but economical  unit designed to sit next to your battery, silently optimising the charge from your solar panel array.

  • Designed specifically for motorhomes, boats and caravans.
  • Fit and forget. Silently optimises the charge from your solar panel
  • Suitable for solar panels of up to 20 amps, 320 watts
  • Optional Remote Display Unit. Bright clear LCD keeps you up to date with the performance of your solar system.
  • Bright LED indicates solar charging mode
  • Intelligent 3-stage PWM charging:
    • ‘Boost’ mode to take full advantage of the available sunlight
    • ‘Absorption’ mode to maximize charge levels, and prolong battery life
    • ‘Float’ mode to maintain the battery once it is fully charged
  • High efficiency SunWorks Precision PWM technology
  • Attractive, compact design
  • No setting up routine
  • Easy to install
  • Compensates for variations in battery temperature
  • Suitable for all gel/liquid 12V battery types
  • Proven high reliability
  • All British design. Built to last

SunWorks solar panels that suit the SB3Z solar panel regulator:

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

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

Here are the basics. See the diagrams below:

  • The regulator is mounted inside the boat or vehicle, close to the battery.
  • A 2-core cable passes through the roof or deck to connect the regulator to the solar panel.
  • Another 2-core cable connects the regulator 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 SB3Z solar panel regulator 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 0.4 kg


Maximum solar panel current

20 Amps

Maximum solar panel power

320 Watts

Battery operating voltage (nominal)

12 Volts


145w x 123h x 45d mm



Controller weight

340 grams

Charge modes

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

Recommended wire type

4 mm sq. automotive cable

Connection type

Automotive ring terminals

Solar panel maximum Voc

35 volts

Operating temperature

-15 degC to +50 degC

Storage temperature

-25degC to +60degC

Environmental protection



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