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T-REX 500 › Charging 6S Lipos at Field.
12-02-2007 02:05 AM  10 years agoPost 1
zsultan

rrVeteran

USA

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I want to connect Two 12V 7A lead acid batteries in parallel to get a 12V 14A power source to power TP 1010C charger at the field.

How many 6S lipos can i charge with this setup. Did anyone try this?

Thanks

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12-02-2007 02:18 AM  10 years agoPost 2
FOX222

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Atlanta, Ga. (Actually Buford)

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1, maybe.

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12-02-2007 02:35 AM  10 years agoPost 3
zsultan

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USA

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Just one?

Thanks

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12-02-2007 02:59 AM  10 years agoPost 4
robl45

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Deerfield Beach, FL

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these things drain a lot of juice, best thing is to just charge off the car battery.

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12-02-2007 03:02 AM  10 years agoPost 5
zsultan

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USA

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I read somewhere that charging with car battery will mess the car battery up. is that true?

Thanks

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12-02-2007 04:01 AM  10 years agoPost 6
pcliftonjr

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Phoenix, AZ

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Deep Cycle...

If you're going to charge at the field the the biggest Deep cycle battery you can afford. Don't try to charge it from your car if you plan to drive home.

Paul

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12-02-2007 04:11 AM  10 years agoPost 7
robl45

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Deerfield Beach, FL

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It all depends really, I probably would run the car when charging or run it after each charge. My wifes car is a hybrid so I don't worry about killing the battery as I can just leave it in the ready mode while charging and it will startup automatically if needed.

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12-02-2007 05:12 AM  10 years agoPost 8
cudaboy_71

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sacramento, ca, u.s.

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these things drain a lot of juice, best thing is to just charge off the car battery.
bad idea. car batteries are designed for high initial cranking amps (10% or less discharges). The plates are more porous and thinner than deep cycle batteries. they also use sponge or expanded metal grids instead of solid lead. you will severely shorten the life of a car battery by using it for deep cycle applications.

i picked up a 105amp marine/deep cycle battery from wal-mart for ~$55 and keep it in the bed of my truck, and top it off with a charger every week. i can charge 2 6s 4900mah packs @ 1C + 2 more 6s @ .75C + 4-5 3S 2100s @ 1C before it gives out (voltage too low to power the chargers).

unless you like replacing your car's battery sooner than you need to, i'd recommend a dedicated starting battery.

if it ain't broke, break it.

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12-02-2007 06:36 AM  10 years agoPost 9
MolokaiBoy

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Lahaina, Maui,Hawaii USA

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I read somewhere that charging with car battery will mess the car battery up. is that true?
I believe this to be true. The batteries in most cars are made to basically start the vehicle up and once it has started the alternator is what keeps supplying electric to the vehicle and its components. The standard batteries in most cars are not made to be disharged then recharged over and over, it is best to keep them at full charge all the time.

Deep cycle batteries however can be discharged then recharged numerous times without much harm.
It all depends really, I probably would run the car when charging or run it after each charge.
I thought of doing that here in Hawaii but with gas prices topping a whopping $3.60 + /gal, I think I better not.

Has anyone tried to use one of those Booster Jumper boxes that can also be used as a 12v/120v power supply using a built in 19aH battery for charging at the field?

Les
Maui RC Modeler's, Big Island RC Helis, http://www.facebook.com/mauirc

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12-02-2007 03:20 PM  10 years agoPost 10
robl45

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Deerfield Beach, FL

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you can use a booster box, however, unless its pretty big, you wont get many charges. However, the one I bought has safety features so it only cranks for like 10 seconds and then cuts off the connections. I'm not sure if they are all like that now so its important to check if you go that route.

A deep cycle battery is certainly an option if you don't mind carrying aroudn a second battery. Another thing you could do is just get a replace your car battery with a deep cycle battery. A number of car audio guys have done this and says it works fine. This of course is not a good idea if you live in a place where it gets very cold.

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12-02-2007 06:24 PM  10 years agoPost 11
zsultan

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USA

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How about Two 12V 7A lead acid batteries connected in parallel? If i could get 2 charges of 6S out of these i am happy.

Any one has tried this option?

Thanks

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12-02-2007 06:25 PM  10 years agoPost 12
cudaboy_71

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sacramento, ca, u.s.

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SLAs just can't take that kind of abuse. they won't last.

if it ain't broke, break it.

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12-02-2007 06:27 PM  10 years agoPost 13
zsultan

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USA

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How about connecting a solar panel to Two Lead acid 7A batteries?

How do you charge lead acid batteries with solar panel?

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12-02-2007 07:50 PM  10 years agoPost 14
mmc205

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PA - USA

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I AGREE WITH THE OTHERS, I CHARGED 2 6S 4000MAH PACKS OFF MY CAR BATTERY AND THE CAR WOULDNT START. THE MAKEUP OF STARTING BATTERIES IS COMPLETELY DIFFERENT THAN DEEP CYCLE. I ALSO PURCHASED A DEEP CYCLE 100 AMP HOUR BATTERY FOR AT THE FIELD CHARGING. ITS BEST NOT TO TAKE THEM PAST 75% OF THEIR CAPACITY THOUGH (SOUND FAMILIAR? ) SO YOU COULD USE 75 AMP HOURS SO FOR ME THAT WOULD BE 9 CHARGES (6S CONVERTED TO 12 VOLTS WOULD USE DOUBLE THE AMP HOURS BECAUSE ITS TWICE THE VOLTAGE
EXPLANATION
100 AMP HOUR BATTERY * 0.75= 75 AMP HOURS
EACH LIPO CHARGE = 22V @ 4 AH SO, 8 AH AT 11 VOLTS,
SO 75/8 = 9.3 CHARGES OR ROUNDS DOWN TO 9. MIGHT EVEN BE EIGHT BECAUSE THE PROCESS IS CERTIANLY NOT 100% EFFICIENT.

HOPE THAT HELPS

***Logo 600 vbar***Henseleit TDR vbar***

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12-02-2007 08:03 PM  10 years agoPost 15
robl45

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Deerfield Beach, FL

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as I understand it, its not nearly that efficient. Besides, unless you have a ton of packs, you probably want to charge at 10 amps or close to it and charge at 2C, not a problem for FP packs and a decent balancing charger. That means your input is probably around 25amps.

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12-02-2007 09:06 PM  10 years agoPost 16
coptercptn

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Mesa AZ. USA

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I tried charging my 6s 5000 batteries with a motorcycle battery 12v (not sure of the AH's) but it would shut the charger down before it could completely charge the battery...then I went out and bought a Diehard deep cycle Marine battery (12V 500 cranking amps) and I have so far recharged my 6s's 6 times and the Diehard battery still reads 12.57V. So, for the price of a good Deep cycle battery I think that is the way to go. I'm using both the top of the line Align charger for reciever/transmitter packs and a Bantam e-station BC-8 for the 6s batteries. I'm able to hook both chargers up at the same time and charge all the batteries simutaniously of of the Diehard.

Home of the "Sea Cobra".....

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12-02-2007 09:13 PM  10 years agoPost 17
cudaboy_71

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sacramento, ca, u.s.

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How about connecting a solar panel to Two Lead acid 7A batteries?

How do you charge lead acid batteries with solar panel?
i think that's called throwing good money after bad. you've already been told that SLAs are no good for charging batteries. you'll be re-purchasing the batteries after less than 1/2 a season of flying...if they make it that long.

if it ain't broke, break it.

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12-03-2007 05:15 AM  10 years agoPost 18
FOX222

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Atlanta, Ga. (Actually Buford)

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I use a 1000w Honda generator @ the field.

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12-03-2007 05:46 AM  10 years agoPost 19
Kona Chopper

rrKey Veteran

Kailua-Kona, Hawaii USA

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I use an Optima Yellow top deep cycle battery to power my Thunder Power 1010c charger. I use it to charge 6S flightpower batteries. OPTIMA BATTERY



Why buy?? when you can borrow and no return

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12-03-2007 01:56 PM  10 years agoPost 20
helimatt

rrElite Veteran

Lafayette, IN

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Convince flying buddies to pool up for a Honda or similar generator and the necessary power supply for the chargers. Seems like the best way to go. Right now I charge from my car battery, but need to run the car if I want to charge more than one pack (and I acknowledge that this is bad practice and the battery will not hold up to such deep discharge.. but I want to fly).

If you don't have anyone else flying big electrics- better evangelize them! Then you can share resources. Purely selfish motivations, you see.

Never, ever, ever, ever give up.

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