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For User Manuals and Frequently Asked Questions (FAQs) please follow the links below. For all other enquires please contact the Jayco Service department on 03 8792 2136.
Yes they can, as gel is a version of lead acid
Yes you can, however the ST35-II and ST35-III is a better option for the charging capabilities
Yes, the ST35 is a smart charger and maintains batteries through float, equalise, store and trickle modes
The type of generator used will impact on how the ST35 works. Consult your dealer for approved generators
Yes, via a diode to isolate reverse current
There is no user adjustable way of disabling the charging system on this unit
The trickle charge is not user adjustable, it is set at 13.8V in the factory. If your battery is very flat (say <9 V), then the unit will be charging at 1.2 A. When the output is greater than 11.8 V, normal charging resumes
Yes it is safe to leave it plugged in to 240 V continuously and yes it does act as a float charger and will not overcharge the battery
1. Check the fuses
2. Consider upgrading to the later ST-II or ST-III series when using poor quality batteries
3. The ST20 will not connect the Aux input voltage to the battery unless the battery voltage is above approximately 9 V
Note: If the battery is not connected, the voltage at the BAT+ terminal will read 0V
Summary – disconnect the ST20-II from the “240 V”
Our suggestion is to get an auto electrician to review your setup. If a battery is installed then:
Battery Positive should be connected to the ST terminal BATT +VE
Battery Negative to ST terminal BATT –VE
Any other wiring won’t permit the ST to charge and provide Low Voltage Disconnect protection for the battery. The Aux In +VE is not designed to be a battery input, it is for external power sources to supply power to the system and charge the battery when mains power is unavailable. The configuration described won’t charge the battery due to an isolation diode on the input of the Aux In +VE
ST Series Tips and Common Questions
Any generator capable of generating a sinusoidal output at 240 Volts and 50 Hz. The generator manual must be read and it must be capable of delivering 560 Watts / 330 Watts at PF of 0.7 for ST35-II/ST20-II. As an example, a 2000 Watts inverter generator that we have checked was only capable of delivering 680 Watts at PF 0.4 to 0.7. This is fine to run the ST35-II/ST20-II, but it would not be able to run anything else at the same time
Generators/Inverters that supply square wave output, will generally have lower peak voltage, this may be too low to run the ST35-II/ST20-II
There should be no problem operating from both 240 Volts and AUX in as long as the AUX in does not exceed the 14.8 Volts limit defined in the manual. The AUX limit of 14.8 Volts must not be exceeded or damage to internal components will occur
It is possible that the power supply will operate in a hiccup mode if the AUX input voltage is above the voltage that the power supply is trying to regulate at, however this should not cause any problem
It usually takes a similar time to charge the first 80% as it does to charge the last 20% of a lead acid battery
The time depends how deeply discharged the battery and charge current. A 120 Amp hrs battery connected to an ST20-II could take around 10 hours to reach 80% charge and another 10 hours to reach 100% full charge. So if it was at 60% full charge, it would take about 2.5 hours to reach 80%, then another 10 hours to reach full charge
Use the Setec BMS-001 battery monitor to keep track of your battery status.
Sealed batteries do not require any cell maintenance. Serviceable types require fluid levels to be maintained
All batteries should be regularly inspected to ensure:
• Terminals are clean
• Connections are tight and secure
• The battery is not cracked or deformed
Keeping a battery at 20 °C and not deep cycling (discharge only to 70%) can improve your battery life by up to 5 times longer than high temperatures (40 °C) and deep discharge (below 30%).
Always check battery manufacturers’ maintenance and operations for maximum battery life
Replace fuses only with the recommended fuse rating and type. – Using the wrong fuse can cause over heating of the fuse board
• To reduce impact of electrical noise
• Keep wires runs short
• Don’t allow big loops to form,
• Ensure all connections are good quality and wire size used is appropriate.
• Route wires as far away as practical from TV and Radio antennas.
• All wires from and to the power supply can be considered antennas,
Following these simple rules will reduce the size and effectiveness of the antennas