Question on Parasitic Draw

[rayfloyd170]

Originally Posted by mannycheckers

You probably want to keep it below 100 mA or 0.1A. For most batteries, the capacity is 50Ah fully charged. 50Ah/0.1A = 500 hours or about 20 days.

In other words, if you have a fully charged battery, it will take 20 days of non-use to fully drain the battery with a 100mA parasitic draw.

This draw also degrades battery lifetime. Car batteries are designed to be "topped up" most of the time so it can adequately power the starter. Keep your parasitic draw as low as possible or look into installing a deep cycle battery. Deep cycle batteries are designed to be drained fully because it doesn't need to crank an engine.

*Edit* in your case you are probably fine.

Thanks a lot for your reply, good info where i can compare to my battery spec. Mine has only 45Ah.

I actually measured my parasitic draw yesterday and it showed 0.12-0.15A (120-150mA) with both OBD and ultrasonic repellant installed & the Add-on permanent keyless entry, by removing the OBD it showed 0.02-0.04A (20-40mA) only. But i know the OBD will shutdown only after 30 mins (standby when there is no activity) and will just consume 3mA as per the manual.

I think i am fine with my set-up. It will draw much at first 30min due to OBD and after that it will be drawing ~40mA current only. On top of that i am driving my car daily so it wont be an issue.