Can SG-1100 running on 12V battery supply?



  • I have a setup where i might want to run the SG-1100 on battery in the future. My question is this possible? Can the SG-1100 handle different voltage ranging from 12.5V up to 13.8V? I dont know how it is designed and if the device have some kind of voltage regulators on board?


  • Netgate Administrator

    Not directly. It needs a regulated 12V supply. It's only tested with the PSU supplied with the device.

    Steve



  • I run all my stuff on a 24vdc battery bank using one of these.. https://www.amazon.com/Samlex-America-SDC-23-Amp-Converter/dp/B0002D6KO0

    They do make 12v to 12v converters but they are not quite as efficient.


  • Netgate Administrator

    Including an SG-1100 because that looks to be labeled 13.8V out? I believe the 13V Zenner on the board would be unhappy if you tried that. I have not tried it. 😬

    Steve



  • @stephenw10

    They are adjustable.. :) If the sg-1100 does not have some sort of voltage regulation on board I would not touch it with a ten foot pole.. I seriously doubt that the included power supply is exactly 12v. If you look at it unloaded its probably closer to 15v.. From the crappy wallworts en such Ive seen.


  • Netgate Administrator

    Probably not the right place for this discussion. 😉

    But it would be interesting to know how many people would run from battery if it was an option for example.

    Suffice to say that we cannot warranty a device that is used with a power supply we didn't test it with.

    Steve



  • Im sure not telling if I do.. :) Truthfully Ive seen posts where equipment I have fails due to the included power supply fairly often.

    Id be very surprised if the 1100 included power supply had any sort of regulation at all past some coil winding's.. My stuff sits right at 13vdc and never moves till the regulator fails due to the battery bank going below 22 volts during a power outage and my inability to get back within 6 or so hours to get the generator started.

    The battery charging system runs from 90-250 or so volts AC so brownouts or spikes never hit the battery bank and the battery floated regulated circuit keep the equipment quite safe. Since I do remote radio sites for a living my job depends on it.



  • @chpalmer I will measure the output from the SG-1100 provided PSU tonight to see what the Voc is just for fun :)

    So you are infact running your SG-1100 on 13.8v then?

    I have been running my old hardware on 13.8v without problems (Netgear 1Gbit switch and 3 different Dovado routers).



  • @stephenw10 said in Can SG-1100 running on 12V battery supply?:

    Probably not the right place for this discussion. 😉

    But it would be interesting to know how many people would run from battery if it was an option for example.

    Suffice to say that we cannot warranty a device that is used with a power supply we didn't test it with.

    Steve

    I do understand that :) It would be fun to know what voltage tolerances the SG-1100 board could handle though (due to design).


  • Netgate Administrator

    It's almost identical to the Espressobinv7 so you can check the schematics and make that decision for yourself.

    Almost everything on the board actually runs at 5V. If I were trying to run it from battery I would look at that. But it will void warranty etc. 😉

    Steve



  • @Taz79 said in Can SG-1100 running on 12V battery supply?:

    It would be fun to know what voltage tolerances the SG-1100 board could handle though (due to design).

    13V
    The Z-Diode at the input limits it. Then there's the 470µF/16V capacitor in parallel.
    See page 6 in the schematics (this is a v5 schematic, SG-1100 is v7, though)

    I'd use something like a 1N5400 diode in front of the device. That can handle 3A and has a forward voltage (drop) of 1,0V to 1,2V.
    The board itself has "Less than 1W thermal dissipation at 1 GHz". That's as much as you'll have on the 1N5400 alone... or damn effective.


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