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Thread: Will leaving Windows in Standby drain battery?

  1. #31
    Low Bitrate Deadnick's Avatar
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    Anyone using standby with an Inverter? I think the inverter is suposed to fall out when the voltage on the battery drops below a certain level so the car would still technically start but the computer would shut down after the inverter dropped out but I wonder if it would run for a few days in standby with the inverter powered. Let me know.

  2. #32
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    An inverter will consume about 250ma by itself (3W), even with nothing connected, which is a lot. I don't know if I am going to use an inverter or dc-dc on the setup I am building, but if I do it with an inverter, I will build a relay circuit to turn the inverter off when the psu shuts down and also bypass the PSU's +5VSB with a 7805 or similar circuit to supply +5VSB to the MB. That will allow me to suspend to S3 (STR) with a minimum of current draw. I will also disable all the wake-up events on the bios, to cut standby power to ps/2, usb, pci, etc, and use only the power switch, that will reduce the standby current even more.

  3. #33
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    Quote Originally Posted by crisr
    An inverter will consume about 250ma by itself (3W), even with nothing connected, which is a lot. I don't know if I am going to use an inverter or dc-dc on the setup I am building, but if I do it with an inverter, I will build a relay circuit to turn the inverter off when the psu shuts down and also bypass the PSU's +5VSB with a 7805 or similar circuit to supply +5VSB to the MB. That will allow me to suspend to S3 (STR) with a minimum of current draw. I will also disable all the wake-up events on the bios, to cut standby power to ps/2, usb, pci, etc, and use only the power switch, that will reduce the standby current even more.
    I use a TI PT6212, it's a boost switching regulator and is just as easy to wire up as a 7805. I have a switch that powers +5VSB from either the power supply (PW60) or from the external 5V regulator. My shutdown controller kills power to the main power supply after ~7 minutes anyway. I also modified my mobo so that the front usb ports are powered by the main 5V rail instad of +5VSB. Now power is cut to usb devices that draw too much during standby (XM PCR, SMC WLAN, GPS receiver). I keep USB device powered during standby that do not draw much power (powermate, dvd rom). The total current draw from the whole system (motherboard, usb etc) is 140mA. This has been working very well.

  4. #34
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    What is "+5VSB", I know the +5V part but not the SB!

  5. #35
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    Quote Originally Posted by kingtut
    What is "+5VSB", I know the +5V part but not the SB!
    I think it stands for 'standby'. In any case, the +5VSB rail is the only rail powered during S3 'suspend to RAM' standby.

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