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Discussion in 'Inspire 1 Discussion' started by Droider, Dec 13, 2015.
Does any one know what the hover amp draw is on the I1?
Yes - its very easy to work out but I'm curious why you need to know.
Yes it may be but I am being lazy and its sunday and my head needs to reboot for the following week! I want to make a discharge unit save flying the bloody machine to calibrate the batteries.
Ahhhh......you do not really need that for a simple discharge unit. I use a 24v/35w halogen bulb to discharge the packs. Gives a nice gentle discharge down to cut off without stressing the cells.
Anyhoo.....to answer your question on rough and ready calculation on current draw at hover:
If we take a 5700mAh pack and fly it down to 20% we would get roughly 15mins (give or take).
So 4,560mA consumed in 15mins therefore we can assume that approximate current at hover is a little over 18Amps (around 18.2A). Obviously considerably more at climb out etc.
So taking nominal pack voltage at 3.7 per cell x 6 gives 22.2v that equates to roughly 400watts.
So my 35watt truck bulb is nice and gentle.
Hope that helps.
Quality answer thanks that will save me a load of mither. Does the pack auto turn off when it gets to 0% or you you have a volt meter / amp meter in line?
There is an auto low voltage cut off (LVC) to stop the cells going below 3.1v and causing damage.
Generally anything around 3.3v is sufficiently drained to accommodate pack calibration but the pack will switch itself off before any damage is done.
You then simply need to allow it to recover back to ambient (usually around 30mins) and then fully charge to 100%.
My calculator says 404W
Oh bummer - yes so does mine .
Its Sunday and I'm knackered My P=IV needs an IV(Drip). I took the voltage of one cell instead of six
Kilrah is correct its approx 404watts at hover (18.2 x 22.2 = 404.04W) - Sorry, normal service is now resumed.
Original post now corrected
So a 35w bulb is going to be really slow as a discharge tool!
Starting from a full battery yes, but to drain the remaining capacity after a flight it's good enough.
Hey guys - don't think its been mentioned in this thread already and think its quite relevant to the discussion. I recently made a dedicated Inspire battery discharger. It discharges to storage level and also deep discharge. I call it the Phantom Angel (it should really be the Inspire Angel but the first version was for Phantom batts and the name stuck!)
Check it out at Phantom Angel