Monitor your vehicle’s Dual Battery System with a Dual Battery Gauge displaying voltage, current and ambient temperature for each battery.
Low and high voltage alarm levels (visual and audible) can be set separately for each battery.
Why do you need a dual battery gauge to display battery voltages, currents and temperatures?
Every dual battery system needs a Dual Battery Gauge to monitor and display;
- Voltage at the terminals of each battery.
- Current flowing in to (charging) and out of (discharging) for each battery.
- Ambient temperature of each battery
Why is the battery terminal voltage important?
The voltage of a lead-acid battery indicates the level of charge in the battery. As shown on the following table, discharging a battery below 40% is likely to reduce the life of the battery and it may not fully recover. Other battery technologies (eg lithium) also have recommended charge/discharge limits.
For example, a check of the battery voltage gives you the information to decide “does my reserve battery have enough charge to keep the fridge cold overnight?”. “Should I switch over to the reserve battery to start the vehicle?” There are many situations where it is important to know the state of charge of your batteries.
Why is monitoring current into and out of the battery important?
While the engine and alternator are running, the current flows show whether your main and reserve batteries are charging or discharging. When the vehicle is not running, the current flow shows how much current is being drawn from each battery by accessories such as fridges and lights.
For example, by monitoring the current flow it is possible to check the current drawn by various accessories, manage the total current drawn and avoid draining a battery too quickly.
Why is battery ambient temperature important?
Good quality batteries perform reliably when exposed to extreme environments and have a wide operating temperature, ranging from -20°c to 50°c (-4°F - 120°F). However, battery capacity and/or battery life is reduced at the extreme temperatures.
Wherever possible, batteries should be located where the ambient temperature is well within the extremes. For example, if the reserve battery can be installed in location away from excessive heat or cold then both the capacity and battery life will be improved.
Dual Battery Gauge Operation
This gauge allows you to monitor and set alarms for both batteries in any dual battery system. The gauge battery sensors are connected directly to each battery and cannot affect the operation of a dual battery system.
The Dual Battery Gauge uses digital technology and has a full colour screen to display voltages, currents, temperatures, settings and alarms.
You can set normal voltage levels which the display will show in GREEN. By setting the minimum voltage levels, an audible alarm and flashing RED display will be triggered if the minimum voltage level is exceeded. If the voltage level is below the normal level but above the minimum level, the display will show an AMBER warning. The gauge can also show the peak voltage and amperage levels reached since the gauge was powered on.
The gauge dimensions and bezel conform to the 52mm diameter automotive gauge standard, so the gauge can be easily mounted in gauge housings or pods.
There are two gauge buttons - Menu and Settings. The steps required to set the battery alarms, adjust the screen brightness etc are easy to follow.
How it Works
The gauge receives continuous voltage, current and temperature measurements from two digital battery sensors mounted directly on batteries 1 and 2. The gauge and sensors are designed to monitor the typical 12v batteries installed in most street and 4WD vehicles
Each digital battery sensor measures the precise voltage at the battery terminals and the charging/discharge current flowing in or out of the battery. The temperature at the battery sensor (attached directly to the battery terminal) is also measured.
All these measurements are converted by the sensor to digital signals which are continuously sent to the gauge for analysis and display. Unlike most standard voltage gauges, the Dual Battery Gauge is not affected by voltage drops in cables, magnetic interference or electrical noise.
The gauge displays battery voltage in 0.1 volt increments. Current is displayed in amperes charging GREEN or discharging RED. Temperature is displayed in degrees Celsius or Fahrenheit (option).
For example, in the 3 simulated gauge displays above, the SAFE volage level is 12.1v and the MINIMUM voltage level is 11.5v. The warning range is 11.5v to 12.0v.
By pressing the Settings button, the gauge will cycle through a display of the range of battery 1 and 2 parameters reached since the gauge was powered on.
The gauge display icons, settings and colours used are clear and easy to understand. One glance at the gauge and, if the battery icons are GREEN, all is normal.
Each digital temperature sensor can measure temperatures from -55°C to +125°C (-67°F to +257°F). The gauge displays temperatures in one degree increments.
Options
- Two digital battery sensors marked 1 and 2 are supplied with the gauge. Usually 1 is the main battery, 2 the reserve
- Replacement sensors or sensors with longer cables are also available by contacting GaugeInnovations
- Celsius and Fahrenheit temperature standards are supported. Please nominate the standard you require when ordering or refer to the Operation Summary for advice on how to change standard.
The gauge has been designed, developed, manufactured and extensively road tested in Australia. It is backed by a 12 month, return to manufacturer warranty against manufacturing defects. .
What's in the box
- Dual Battery Gauge 52mm diameter, 47mm long, bezel 57mm diameter
- U shaped gauge mounting bracket for automotive style gauge pods and housings.
- Power connector plug and cable 12v DC. Red is positive, Black is negative chassis ground.
- Two digital battery sensors including cables (1 meter) and connectors. The Battery Sensors 1 and 2 are clearly marked. The shunts have a nominal rating of 300A but can carry and sense higher currents..
- Junction box to mount under the vehicle bonnet.
- A cable (2.5 meters) with a plug at each end to connect the gauge to the junction box (normally through the firewall) 4 pin plug is at the gauge end, 3 pin plug at the junction box end.
- Instruction manual
Gauge installation is straightforward. Only two connections are required.
- One plug for power (2 wire, positive and negative)
- One plug for the battery sensor junction box (single cable to run through the firewall)
- The sensor is connected directly to the battery negative (earth) terminal to provide accurate voltage and current readings.
- The sensor is installed with the correct orientation. An arrow on the sensor points to the battery terminal end. Reverse sensor orientation will not damage the sensor but the voltage and amperage measurements will be incorrect.
- While working on the first sensor make sure the second sensor is insulated. Eg wrapped in thick dry cloth or similar non-conductive material.
- Both sensors must be well away from any sources of excessive heat such as exhausts, turbos etc.
- Sensors must be protected from mechanical damage to the sensor or its cable
- Sensors must be well away from sources of excessive electrical noise (eg spark plugs, distributor and two-way radios)
The gauge requires 12 volts DC to operate. This should be from a fused, switched power source that is activated by the ignition key. The gauge requires less than 60ma current during normal operation.
For best viewing, avoid installing the gauge where it will often be in direct sunlight.
The cable from the gauge to the sensors will need to be run to the central junction box located under the bonnet. Normally this will be through the firewall.
The junction box under the bonnet is secured in a convenient location where the sensor cables can be connected. In the case of 4WD vehicles, the junction box should be located where it will not be submerged if driving through water. Alternatively, the junction box and cable entry points can be sealed using silicone or similar material.
NOTE: You should decide which of your vehicle batteries will be battery 1 and install the correct sensors on battery 1 and 2. The sensors are suitable for negative vehicle earths only.
It is important that each battery sensor is installed as follows:
The thin red voltage sensor cable is attached to the battery positive terminal (red). Note this cable is required to measure the voltage at the battery terminals. The cable carries no current, but has an integrated self resetting fuse as a safety feature
Further details are in the gauge manual and installation instructions.
Please note
that due to eBay presentation variation the gauge screen colors may not
be exactly as shown.