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Alenux
Power from USB only

I'm planning to power both my OVMS module and a dash cam from a USB power bank I have lying around with two outputs. For the dash cam I am doing this so I can capture footage while I'm parked. For the OVMS module I'm doing this to reduce the risk of running down the 12V0 battery in my car (even though I realize the current draw is low). 

To do this, I will plug my power bank into the 12V0 USB adapter I have and then plug the dash cam and OVMS module into the other end of the power bank. I realize that the OVMS module power input is OR'ed between the USB and the 12V0, so my plan was to remove D1 so that the only power option was through the USB port.

Is the USB port enough to power both the OVMS mainboard and the modem? Based on this stack exchange post, SAE J1962 states that the OBD terminal can supply at least 4.0 A, so it has much higher current capabilities than the USB. I imagine that the modem transmission can cause some large transients. Is there a power model for the OVMS module anywhere?

Thanks for any help

dexter
dexter's picture
Power from USB only

You can power the module incl. modem from USB.

Power requirements: https://docs.openvehicles.com/en/latest/userguide/warnings.html#average-power-usage

Regards,
Michael

Alenux
Thanks for the confirmation!

Thanks for the confirmation! I noticed that the link only includes the averages powers for the module; I don't see anything estimating the maximum current consumption. Had that work ever been done? Would that be valuable?

dexter
dexter's picture
Power from USB only

Peak with 1 second average is around 400 mA @ 5V (on GSM burst). If you can measure with higher accuracy, go ahead.

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