Voltage Adjustable VSR

- Your current dual battery set up is probably either damaging your battery, or not maximising your useable capacity
- Choose your own voltage cut in / cut out / dealy, in 0.1v increments
- If your aux battery drains until empty, you are damaging your battery and reducing its future capacity and cranking amps.
- Adjust the cut off voltage to 50% of your capacity to avoid sulphation process, keeping your battery healthy
- Normal VSR will cut off at 12.7 or 12.8 volts, or 10% capacity. Change this to 12.4 volts to use the full 50% of safe capacity.
- If you have a single battery, use this device to cut your fridge off at a level that will still start your car off that battery in the morning.
- A better safer alternative to current VSR for dual battery set ups
- 150A

- 1 year warranty 

 

General instructions for setting up VSR to stop a battery draining below a set voltage:

- isolate 12v system (car, boat, caravan, appliance etc.)

- add VSR in line the positive cable to the system you to want to avoid draining. Think of the VSR like a switch that turns off when the voltage in that line goes below your required level (disengage voltage setting), then turns back on to complete the circuit and reapply current when the voltage goes above the required level (engage volts setting – eg when car turned on). We commended 6AWG 13mm2 and good quality connectors when making VSR in line circuit. Use tinned cable on boats.

- we advise running a fuse between the battery and VSR between 125a and 150a.

- we also advise keeping the VSR away from the engine heat for best results (Storage temperature -25 to 75C, operating temperature -20 to 60C), but as close to battery where possible to minimise voltage drop. Behind the bonnet grill is a good balance for dual battery set ups, or just inside the firewall for example 1, which also allows you to adjust voltage and settings from inside the vehicle.

- Hold SET button for 3 seconds. Press the up and down to cycle through parameters.

- Find U1 (engage volts) and press SET again.

- Use up and down to set this voltage to desired engage volts (what voltage the switch will close to send current).

- Press set again to save to go back to menu.

- Scroll to U2 (disengage volts), and use the same process to change to desired disengage volts (the voltage you want the circuit to stop, eg fridge to turn off, dual battery to stop equalising voltage etc)

- If you want to change the delay between the voltage being met and the relay turning on or off, use the lower case letters to edit the delay time in seconds.

- Eg t1 at 10 will delay 10 seconds before engaging, t2 at 10 will disengage at ten 10 seconds when voltage met etc. These are default to 10 seconds which is a good level.

- When satisfied, leave unit for 10 seconds to exit menu and you are ready to go.

- if using as dual battery set up (Example 3) hold the A button for 3 seconds to override the relay and use both batteries to start car (for example if starter battery is flat). The override will stay on for 60 seconds to start the car each time.

- the power button will turn the unit off during long term storage. We recommend leaving the unit on if intending to avoid a drained battery.

Example 1:

A dual battery set up where you want your car fridge to turn off when your battery goes below 50% capacity to reduce battery damage and maintain absolute to start engine. Suitable for all non lithium batteries (lead acid, deep cycle, marine, AGM etc).

Isolate system

Find positive fridge lead coming from aux battery positive post.

Put this lead on the right hand side VSR connection post (closest to set button) using strong connection with minimal resistance (no thin wired sections, no corrosion, metal connectors or crimps, no loose connections that feel like they will snap easily)

Use a cable (recommended 6AWG 13mm2) and good quality connectors to connect the positive aux battery post (what you disconnected the fridge from) to the left hand VSR connection post (closest to A button) utilising a 125a – 150a fuse in between. Use enough cable to keep the VSR away from direct engine heat.

Connect ground lead from VSR to vehicle ground (in most cars the vehicle body is a suitable ground).

Secure the VSR using supplied screws if required to minimise vibration.

To set the VSR to stop the battery draining below 50% (normally 12.4V), and kick back in when engine started (eg 13.1V), we need to set cut in to 13.1V and cut out to 12.4V. Battery sulphation specs can be checked with manufacturers.

Hold SET button for 3 seconds.

Press the up and down to cycle through parameters.

Find U1 (engage volts) and press SET again.

Use up and down to set this voltage to 13.1V.

Press set again to save and go back to menu.

Scroll to U2 (disengage volts), and use the same process to change to 12.4V.

If you want to change the delay between the voltage being met and the relay turning on or off, use the lower case letters to edit the delay time in seconds.

When satisfied, leave unit for 10 seconds to exit menu and you are ready to go.

Example 2:

Single battery set up and want to avoid draining below a level so that you can still tart your car.

Complete same process but change voltage to the level you can safely start your car in the morning (eg 12.6v). Anything that will drain your battery (eg fridge, lights etc) should come off the RHS of your VSR and not the positive side of your battery.

Example 3: Use as a dual battery set up to allow charging of second battery when engine on, and disconnect batteries when engine off. Note: the advantage here is you can choose the voltage unlike other manufacturers.

Connect positive starter battery to left hand side of VSR post.

Connect right hand VSR post to positive auxiliary battery.

Connect VSR ground to engine ground.

Set voltages as desired. (engage to 13.3V and disengage to 12.8V is a good starting point and the default of our VSR).

Example 4:

Use to protect sensitive equipment going below set voltage (not just in car or boat).

Complete steps in example 1, making sure voltage is set above damaging level on your appliance. Can be changed in 0.1 step increments. The appliance will now turn on above that set level, protecting the appliance while giving maximum run time.