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Cost Of Charging 5200mah Lipos

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Old 11-09-2012, 09:26 AM
  #1
Henryslash
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Default Cost Of Charging 5200mah Lipos

Hi all

Just trying to work out cost to charge up 5200 mah 30c lipos at 6amps would be ?

My electric supply company charge me 20 cent per kilowatt per hour.

I am using the Turnigy 400w multi charger which can charge 4 batteries at a time.

All info greatfully appriciated :-)
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Old 11-09-2012, 04:25 PM
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Default RE: Cost Of Charging 5200mah Lipos

We need the voltage of the battery pack. It is obviously twice as much to charge a 6s pack than a 3s pack.
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Old 11-10-2012, 01:09 AM
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Default RE: Cost Of Charging 5200mah Lipos

Hi 

yea sorry it is a 2s 2p 30c zippy 7.4v lipo
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Old 11-10-2012, 03:07 AM
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Default RE: Cost Of Charging 5200mah Lipos

I've wondered this myself from time to time, looking forward to seeing if anyone knows, even if it's only a rough amount.
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Old 11-10-2012, 06:09 AM
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Default RE: Cost Of Charging 5200mah Lipos

Well, you can find the watts you're using by multiplying voltage x amperage. If you pack was charged with 7.4v(not sure about this) at 6 amps, that would be 44.4 watts. Of course that's not including the power the charger needs to operate. Also in order to complete the estimate, we'd need to know roughly how long it takes to charge the pack.
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Old 11-10-2012, 09:23 AM
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Default RE: Cost Of Charging 5200mah Lipos

Let's build on that 44 watts and assume it takes an hr. It looks , like a penny.
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Old 11-10-2012, 10:28 AM
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Default RE: Cost Of Charging 5200mah Lipos

Yea, I never even knew this was an issue worth worrying about. No offense intended to the OP, and PLEASE don't take it as such, but RC is not cheap, if you are in a position to worry about what charging a battery will do to your power bill, maybe this isn't for you. I would, however, love to invite you over and see you cringe when my welder or air compressor dim the lights
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Old 11-10-2012, 11:12 AM
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Default RE: Cost Of Charging 5200mah Lipos

FahrtAutoRC who said i was worried about it you muppet?

I just wanted to know if anyone had an idea what it cost.

I came on here to hear genuine replies to my question.

I would prefer if you have nothing to add to the post that yourefrainfrom posting anything.

I would love you to see my bills for skydiving and riding a ZZR1400 every year i am sure you would also cringe ....no offence intended
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Old 11-10-2012, 11:42 AM
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Default RE: Cost Of Charging 5200mah Lipos

Wow, dude, I seriously meant no offense and even took lengths to emphasize that. Your OP made it sound like you were concerned about the cost, not curious.

And personally, nobody cares what bike you ride or what you do in your free time, dude.

And I didn't ask for the pissing contest to begin with. I'll get your feet wet anyways son. Moving on now...

Quote:
ORIGINAL: Henryslash

FahrtAutoRC who said i was worried about it you muppet?

I just wanted to know if anyone had an idea what it cost.

I came on here to hear genuine replies to my question , not to hear some smart ass take the pee.

I would prefer if you have nothing to add to the post that yourefrainfrom posting anything.

I would love you to see my bills for skydiving and riding a ZZR1400 every year i am sure you would also cringe ....no offence intended
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Old 11-10-2012, 12:57 PM
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Old 11-10-2012, 02:26 PM
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Default RE: Cost Of Charging 5200mah Lipos

Now now, Henry......ya might give the bloke the benefit of the doubt.....sometimes typing words from yer head and someone else reading them CAN lead to inferred inflections not there.  Be nice here, mates.
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Old 11-11-2012, 08:25 AM
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Default RE: Cost Of Charging 5200mah Lipos


Quote:
ORIGINAL: FahrtAutoRC

Yea, I never even knew this was an issue worth worrying about. No offense intended to the OP, and PLEASE don't take it as such, but RC is not cheap, if you are in a position to worry about what charging a battery will do to your power bill, maybe this isn't for you. I would, however, love to invite you over and see you cringe when my welder or air compressor dim the lights
I totally agree!! Yeah watch the meter spin at 10,000 rpm when using the welder!! Hey man look at it this way...the dude skydives...he has much bigger problems than being concerned about what it costs to charge a battery.
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Old 11-11-2012, 02:51 PM
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Default RE: Cost Of Charging 5200mah Lipos



Ha! Funny stuff...muppet...I'm going to use that!
One way to figure it out would be to flip off all the breakers on your meter exept for one that nothing but your charger is plugged into. Record the reading before and after you charge your battery. This would give you precisly the amount used. With that number you could figure out the exact cost.  Let us know what you find out.

Muppet...ha!

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Old 11-11-2012, 03:13 PM
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Default RE: Cost Of Charging 5200mah Lipos

Omg I've got a thing that plunges into my power point to measure costs of things running.... Might have a look for it and do a test
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Old 11-12-2012, 03:21 AM
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Default RE: Cost Of Charging 5200mah Lipos

Henry mate, this isn't the kind of forum you can get away with that. I'll be editing your posts later (limited access from the office), this is a wholesome family forum, we have kids as young as 8 on here.

Fahrt, if you'd been following Henry's threads, you might have noticed that he is starting a small RC track and hire venture, so will be charging large numbers of packs constantly, up to 30 packs possibly 15-20 times a day, as you can imagine electricity consumption then becomes a concern.
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Old 11-12-2012, 04:21 AM
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Default RE: Cost Of Charging 5200mah Lipos

Sorry Foxy and anyone else i upset i will remove the remarks now myself.
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Old 11-12-2012, 05:13 AM
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Default RE: Cost Of Charging 5200mah Lipos

ok ive been playing around.

Electricity is expensive here tho its about 18c/kw,h

The supply was 244.6v @ 50htz
Im using a 30a Power Supply to Power 2x Imax B6 chargers, both where on but only one was charging.
I charged a 2s 7.4v 5500mah 30c lipo @ 5amps max
Mind u the battery charged to 6351mah but took its time to ballance, 104min normally its alot faster
Using a Efergy power meter It dident measure of its kw,h scale (000.0) but it did peak at 65 watts and droped to 16 watts neer the end of the charge

So lets use the peak value.
charging at 5amps for one hour consumes 0.065 kilowatt hours (65 W / 1000 W/kW) × 1.73333h (104min) = 0.11266645 kW,h.
0.11266645 kW·h × $0.18/kW,h = $0.020279961,
or two cents.

Keep in mind this is the max values. no way would it ever use that much power to charge. still a hell of a lot cheaper than nitro's
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Old 11-12-2012, 05:55 AM
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Default RE: Cost Of Charging 5200mah Lipos

Hi Phmaximus

Thanks for the info. Wont break the bank then

Can you tell me how long it usually takes to charge up your 5500 mah 30c lipo as i have 5200 mah 30c lipos and was hoping to charge each one in under an hour at 5 amps...do you think this is possible?


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Old 11-12-2012, 06:35 AM
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Default RE: Cost Of Charging 5200mah Lipos

no not at 5 amps.

The best u will get would be 1.2 hours but thats with a really good battery at 20% Efficiency Loss, 1.4h 30% & 1.5 for 40%

So it would be around 1.2-1.5 hours providing they are not higher than 5200mah

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Old 11-12-2012, 06:43 AM
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Default RE: Cost Of Charging 5200mah Lipos

Henry, as you learn which individual packs have well balanced cells in terms of the way they DIScharge, in other words, are usually pretty well balanced when the lvc stops the truck (and therefore need balance charging less often), you will be able to do 'fast' charges at 5A, which will be done in about 50 minutes I would guess. The time is added doing balance charges as the charger pisses around with the cells to try to get them matched again toward the end of the cycle. What you could do, though there is a small risk attached, is balance charge only once every 5 (for example) charges. The non-balance charges will be fast.

6A will give you the hour you want even on a balance charge, and 40-45 mins on a fast charge. I can see why you are keen to reduce the amps, as 6amps to 5amps is an 18% decrease in overall power usage, however, with the charge taking longer, I really don't think you'll realise gains in the region of more than 5% by dropping an amp; stick with 6A.
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Old 11-12-2012, 06:49 AM
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Default RE: Cost Of Charging 5200mah Lipos

Hey Foxy whats ur take on charging at 1c??? sometimes Ive charged at 1.5c on a ballance charge. and wonder if it is really that bad?
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Old 11-12-2012, 07:34 AM
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Default RE: Cost Of Charging 5200mah Lipos

I think if the battery is rated for it, go for it, IF you have a good reason. When I'm charging on a Friday evening in anticipation of a Saturday bash, I balance charge at 1c. When my first pack(s) are depleted at the bash spot, they go straight on the charger at 2C non-balance. I then balance and store charge them when I get home.
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Old 11-12-2012, 08:26 AM
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Default RE: Cost Of Charging 5200mah Lipos

Thats great info.
The Turnigy 4x6 4 waychargeri got seems to only charge at a maximum of 5amps . I have not connected a lipo upto it yet as i am waiting on traxxas battery connectors but when i connect up the charger and go through the settings it says lipo charge 5amps...now i can go down the ampage to 4.9 4.8 etc etc but not up past 5amps to say 5.1 5.2 or 6amps etc.
Anyone else using one of these?
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Old 11-12-2012, 09:09 AM
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Default RE: Cost Of Charging 5200mah Lipos


Post deleted since it has already been addressed.
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Old 11-12-2012, 09:11 AM
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Default RE: Cost Of Charging 5200mah Lipos

I think that this info covers a retorical question, when concerned to the feeling of Nitro costs exceeding the YS engines in short order in pattern planes, and the
general census that electric is sooo much cheaper to run .....

I had no idea of the "TRUE" costs of running a YS 170 pattern engine, untill it was all spelled out for me....
It was staggering to say the least... In the THOUSANDS OF DOllars....on HIGH NITRO (30%) for a years worth of competitions...not including practice...


I am thankfull that I was able to see some knowledgable information on the subject...
But ONLY 2 cents...to fully charge a large ma lipo???
I would think it would be more in the dollar range.... as Electricity costs increase, and decrease depending on the time of year...
Or perhaps I am geting walked on by my electrical company...

Thanks guys....
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