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Home✈️Aircraft🚁HelicopterAerial Photography and Video › Charging big lipos on the road
06-15-2009 06:19 AM  11 years ago
borneobear

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Kuala Lumpur, Malaysia.

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I run my TP1010 charger right off the cigarette lighter socket charging 8S1Ps at 1C with no issues. Never seen a shut down before.

I do try to charge only when the engine is On (i.e. while driving).
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06-15-2009 08:48 PM  11 years ago
Torsten

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Germany

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i have a vw bus with a "winter package" which has a second battery under the driver seat. i had a local car hifi shop run some fat cables to the back including a circuit breaker right in front of the driver seat. i also installed good size capacitor, also from the car hifi folks, a smoke detector right above the charger and a co² fire extinguisher within reach round of my on the road package.

check the output voltage of cars generator !

t
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07-21-2009 11:55 PM  11 years ago
CRCR

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Aus

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what size cables do you guys run from the battery to the back of car?

I have to run about 5 meters of cables from battery - under car to the rear. Do you think 8 or 10 gauge will be big enough? I'm also running these cables to run a 150w inverter.
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07-22-2009 12:40 AM  11 years ago
fionn

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Ireland

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The cables dont need to be huge, I think 8mm squared should be more than sufficient for most charging requirements. The important thing is the volt drop across the cables, this becomes even more important if you want to charge a secondary battery in the trunk(boot) as if there's too much voltage drop the battery will not charge fully.
Ideally you could connect the cable length temporarily to your car battey output & run your proposed load from the remote end & measure the voltage at each end.
There are lots of free and easy to use voltage drop calculators on the web where you can punch in your requirements in terms of cable length and voltage drop & it will provide you with the cable cross sectional area which you require.
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07-22-2009 02:01 AM  11 years ago
aramsdell

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Sanford, Maine

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Hi, I'm an electrician. Try this one. I just did calcs for #10 guage and #8 guage (AWG) AWG is American Wire Guage. # 10 should be sufficient for charging a 6S pack at 10 amps with engine running and alternator putting out about 13 volts. This calc shows about 4.7 % voltage drop at 12v input and 11.43v out the other end to the charger. That's just a little low but with the alternator going you will be getting 13 or more volts. That gets you to about 12.5 v input to the charger that is drawing about 20 amps and putting out 10 amps at 25.2 volts. Whew !

http://www.nooutage.com/vdrop.htm

Select what is available 14V , DC , #10 , 20A , Copper conductors , no conduit , single set of conductors , 15 feet (one way). Gets you 4% drop. 4% of 14 gets you 13.44v. 150 watts for your inverter would be DC Power = current * voltage (P=IE) 150=1.25 amps * 120 volts. Simplistically if you are only starting at 12 volts and that means 150=I*12volts where I now = 12 amps not including any inefficiencies of the inverter.

12 amps is well within the voltage drop of that #10 guage set-up.

Final answer #10 is good. # 8 is always better if you ever intend to upgrade your inverter though.

Al Ramsdell.
Should've bought a sim. Got a bucket of used blades!
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07-22-2009 02:56 AM  11 years ago
CRCR

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Aus

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Wow, Thanks aramsdell,

I'm running my heli on 10S so am hoping to charge 2 x 5S 5000mah packs simultaneously using a cellpro 10s charger. Will 8 AWG be ok for this?
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07-22-2009 03:54 AM  11 years ago
aramsdell

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Sanford, Maine

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Go ahead, fry my brain! I think yyour 10S charger is good to charge 2 5S packs at only 5amps. The charger is good for 250W output. 10s is 42v fully charged and it will charge pretty much full current up to about that voltage. The calculations don't really care that it is 2 5S packs. P=I * E . so Power = 42V * 5 amps. Power = 210 watts (out ) of the charger. A little more into it. Voltage going in is more like 13 volts on alternator, sometimes up to 14 v. SO lets use 13 volts into the charger and 210 watts and solve for the current. P= I*E. 210=I * 13. I=210/13. Charger input(not including heat dissapated by the charger) is 16.15 amps. Plug 16.15 amps into the voltage drop calculator. I think you are still good to go with # 10. I don't have that web-page up at the moment.Should've bought a sim. Got a bucket of used blades!
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07-23-2009 09:50 AM  11 years ago
CRCR

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Aus

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Thanks aramsdell, I think I'll go for 8 AWG just to be on the safe side, like you say, in case I upgrade the inverter or something
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