We just launched our sailboat and have now had the opportunity to measure the current
draw of the st5112 using an accurate digital battery monitor
. Unfortunately, it draws more current
than our Dell Inspiron E1505 laptop
we hope to replace. The measurements were 4.4 Amps at 12.5 VDC (55.0 Watts) for the tablet vs 3.3 Amps at 12.5 VDC (41.3 Watts) for the laptop. In both cases, it was running OpenCPN at idle. We had really hoped it would draw less than the laptop.
The next task is to reorganize the displays at Nav station to accommodate the mounting of ST5112. As mentioned, above we acquired a mount which allows for easy removal
and even rotation. It now appears that we will give up on rotation give space limitations on the bulkhead.
Edit: whoops, someone on another forum pointed out that a good part of the current draw measured for the tablet was probably going to charge the battery
. I removed the battery and reran the test and got 1.45 Amps at 12.7 Volts (18.4 Watts). That's a whole lot better!