I get confused sometimes with these calculations. The specs in RitSim's post show "10W at 25% duty cycle". so wouldn't that already assume active steering 1/4 of the time? So if it was in use (not in standby mode) it would draw 10 Watts (at 25% duty cycle) which over an hour would be about .75 Amps so the 1.8 AH battery pack would last just a little over 2 hours (at 25% duty cycle). Is that right?So that means it's drawing about 1A when it's steering. Assuming it's steering 1/4 of the time, i.e., 25% duty cycle, that's only 1/4 of an Ah per hour. Sound right?
If that's so, I might hot-wire a Li-Ion car jump starter that I could almost put in my pocket, and recharge it from my car cigarette lighter on the way to/from the boat. There's one on Amazon that's 1.8Ah and has a a 12V 10A jack on it.
Not a lot of heavy lifting herein for you to verify yourself. It's always best to do your own due diligenceThanks! I can't wait till you guys get this figured out.
Oh, 18 is a lot more than 1.8.First, typo: it's 18Ah, not 1.8Ah.
Let's see. 10W is 0.8A at 12.5V. 18Ah can provide 0.8A for 22 hours. At 25% duty cycle, that's 88 hours of operation, or about 3.7 24-hour days.
40 mA in standby.those specs are for a ST4000, not the 1000/2000. Am I missing something?
The ST1000/2000 load is 40mA
Yep, except never count on more than 50% of the battery capacity. Running a battery lower shortens its life.Thanks! I can't wait till you guys get this figured out.
for lead-acid, yes, not for litium-ion. Depends on the chemistry.Yep, except never count on more than 50% of the battery capacity. Running a battery lower shortens its life.
Ken