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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Under-hood 150 amp DC generator
04-10-2014 07:30 PM  5 years ago
Tyler

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Chicagoland area

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Using my 48v electric golf cart with 8 x6v lead acid batteries I can charge two 10s 5,000 packs in about 12 minutes simultaneously at 40 amps on each charger port. If I don't do a full normal balance I can be done in 9 minutes.

I've done it.
Enjoy things that money can buy IF you don't lose the things money can't buy.
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04-10-2014 07:38 PM  5 years ago
AirWolfRC

rrProfessor

42½ N, 83½ W

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That iCharger 4010 duo charger can handle up to 48V input. That does not mean that you have to go that high but it is convenient if you use 4 ea 12V LiFe batteries.

Using 4 ea 12V 100AH batteries, you have 4800 WattHours of energy.

each flight of 80% of a 10S 5,000mah pack is 0.8 x 3.8 x 10 x 5 = 152 WattHours

80% of 4800WattHours is 3840 WattHours

3840 / 152 = about 25 flights
. . . (without derating for the inefficiency of the charger)

Notice I'm using WattHours . . . not . . . mah

This might also help,

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04-10-2014 07:47 PM  5 years ago
Tyler

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Chicagoland area

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Would it be 3.8 x 10 x .5 instead of 3.8 x 10 x 5?

I honestly don't know, but the lower figure sound right to me.

It takes 1,000 mah to make 1 ah, right?

Sorry, typed an extra zero. Edited it.
Enjoy things that money can buy IF you don't lose the things money can't buy.
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04-10-2014 07:51 PM  5 years ago
AirWolfRC

rrProfessor

42½ N, 83½ W

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No,
1,000 ma = 1 amp
and
1,000 mah = 1 ah

ma means mili-amp . . . mili is a thousandth
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04-10-2014 07:53 PM  5 years ago
Tyler

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Chicagoland area

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Thanks. Fixed it.Enjoy things that money can buy IF you don't lose the things money can't buy.
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04-10-2014 08:07 PM  5 years ago
bobhend

rrNovice

Fairport NY

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1 CENTS WORTH OF ELECTRICITY
What is amazing to me is our $150 6S 5000 lipos hold roughly a penny's worth of power. I have the good fortune to live in a municipal power district where we pay about 4.5 to 5 cents a kwh. Some people here are paying over 17 cents, but even that works out to 2 cents of power [and 4 cents for the helis using 2 6S 5000's]. Thus you can see, when electric vehicles become popular the government will want to tax electricity to replace all the lost fuel tax revenue. My 24V deep-cycle marine battery system is nearly done and I will put up pictures soon.
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04-10-2014 08:12 PM  5 years ago
Tyler

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Chicagoland area

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Air wolf, I read your formula and calculations again and realize now where the 5 ah comes from.

By using these numbers, the cost of buying a large LiFe battery bank would not seem worth it.

Anyone else have comments on the figures posted?
Enjoy things that money can buy IF you don't lose the things money can't buy.
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04-16-2014 10:02 PM  5 years ago
bobhend

rrNovice - Fairport NY - MyPosts All  Forum  Topic

Finished the 24 Volt deep-cycle system ON HOLD !!!
THESE TWO BATTERIES NEED TO BE IN PLASTIC BATTERY BOXES - DESIGN BEING REVISED DO NOT BUILD AS SHOWN . Ordered 2 at Walmart for $8 each.

I finished my project which is a charging system based on two group 24 Maine deep cycle storage batteries. PM me and I will send you the details to build it. This system meets the needs for many of us but provides nowhere near the daily output of a gasoline generator setup.
The system will provide the charger [in this case a Powerlab 6] with 25 amps at 24 volts. It can be pushed to 40 amps if necessary. Ideally it should be used to 50% of capacity, meaning the open-circuit voltage of the deep-cycles is about 12.2 volt per battery. They can be discharged to 80% or about 12 volts. However each cycle run at 40 amps, or each 80% discharge is equivalent to two cycles. If you did both, it would be equivalent to running 4 cycles at 25A and 50% capacity.
I re-charge at home using a digital charger on the 10-amp setting, or 5 amps per battery. In the off-season or periods of low use they are on a 1.5 amp "maintainer", the Schumacher XM1-5. Just don't leave them unattended on an old analog 10 amp charger. PM me and I will send you the details to buy the parts and build it. The parts are: heavy-duty DPDT center-off toggle, 10 position terminal strip and 10 gauge primary wire and terminals. Note the catch tray ! I already had a brand new Exide 24 EV belch acid on a 1 amp initial charge. The parts dealer replaced it and the replacement is OK but these things CAN for unknown reasons, expel acid. Add a box of baking soda to the parts list. A very useful tool is a DC clamp-on current meter such as the UNI-T #204, $52 on Amazon.
I will add more photos soon. I added the "details of construction"; they were in pdf but I found an online service that converted it to jpg, unfortunately it only converted the first page of 3, gak ! write me for the entire thing.
Also, if I had it to do over again, I would seriously consider using AGMs ,[probably the larger size 31] because they are sealed & unlikely to spill acid and should be able to supply 40 amps without degradation.
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