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Old 08-15-2014, 07:39 PM   #41
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Re: 12v and 24v+ high output power supplies


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Thanks for the info. I'm new to the site and to the planes. I own a AS3X BNF The Beast, an Apprentice (old version) and my newest plane is a 60 Giant Super Sportster rebuilt by me after I found it in a barn. Looking to buy a motor for it but I not to sure how to figure out what motor to use exactly. What was suggested was a OS16521, but I've seen a motor in the classifieds for a OS magnum motor. Not to sure if that would be to big for the plane.
Not quite sure man, I fly electric.

May want to post this in the gas planes forums instead of here haha
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Old 09-05-2014, 02:34 PM   #42
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Re: 12v and 24v+ high output power supplies

bump ttt!
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Old 09-21-2014, 12:31 PM   #43
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Re: 12v and 24v+ high output power supplies

bump ttt
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Goblin 700 comp(BNIB)
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Old 10-01-2014, 01:41 PM   #44
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Re: 12v and 24v+ high output power supplies

bump ttt
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Old 10-23-2014, 08:42 AM   #45
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Re: 12v and 24v+ high output power supplies

Hi, this is my first post. I don't have a charger yet, but when I buy one I want one that will be good for charging everything including small 1 cell lipos to the big 4s-6s 4-5000mah lipos, etc. I'm not sure what charger or power supply to buy, but faster charge times would be nice...can you provide more knowledge or numbers? Thanks.
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Old 10-23-2014, 09:41 AM   #46
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Re: 12v and 24v+ high output power supplies

(Sorry to Jack your thread Cory... figured I'd take a stab at this one)

Hover, It's related to your overall output needs.
(Noting that even the largest chargers should still be fine for small lipos)

A 1S 3.7V 200mAh lipo charges at 0.2A (1C charge)
A 6S 22.2V 5000mAh lipo charges at 5A (1C charge)

Volts x Amps = Watts

For a 1S lipo:
- A 1C charge (0.2A) needs 3.7 x 0.2 = .74 Watts
- A 2C charge (0.4A) needs 3.7 x .04 = 1.5 Watts

For a 6S lipo:
- A 1C charge (5A) needs 22.2 x 5 = 111 Watts
- A 2C charge (10A) needs 22.2 x 10 = 222 Watts


Let's say you have one of the popular 50W 6A chargers.
- It will charge the 1S with no issues
- It will charge the 6S at 2.25A (even if you set it at 5A)
- Why is it limited to 2.25A?... Becase this charger can only support 50W
- For a 6S lipo this means the maximum charge is 50/22.2 = 2.25A

This smaller 50W charger won't damage the 6S lipos, but it will take a fair bit longer to charge them.

So, if your goal is to charge a 6S 5000mAh lipo at 2C, you would need:
- A 10A charger that rated for more than 250W
- A power supply that is rated for even more than this

Power Supply notes:
- Power Supply must be within input voltage range of the charger
- Cost aside... more Amps are better. (Charger will only draw what it needs)
- a 12V power supply will work with every DC charger (voltage wise)
- These server units advertise monster current of 47A at 575W

Hope this helps...

If it's still too confusing just start a new thread on chargers and charging basics. It will help to focus on this topic..
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Old 10-23-2014, 10:03 AM   #47
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Re: 12v and 24v+ high output power supplies

Thanks for the quick reply, very helpful. So, if I buy a charger that is rated at say 400 watts, would this server power supply work, assuming the charger input is 11-24v. At 2C charge rates, about how long would it take to charge a 4s-5000mah Lipo pack, and does it matter what the C rating on the battery is? Sorry, but I'm just trying to learn this stuff lol.
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Old 10-23-2014, 11:00 AM   #48
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Re: 12v and 24v+ high output power supplies

I wanted to start off by saying thanks Ed, saved me some typing lol

Quote:
Originally Posted by twistedge View Post
(Noting that even the largest chargers should still be fine for small lipos)
It will be 100% fine, no issue

Quote:
Originally Posted by twistedge View Post
A 1S 3.7V 200mAh lipo charges at 0.2A (1C charge)
A 6S 22.2V 5000mAh lipo charges at 5A (1C charge)

Volts x Amps = Watts

For a 1S lipo:
- A 1C charge (0.2A) needs 3.7 x 0.2 = .74 Watts
- A 2C charge (0.4A) needs 3.7 x .04 = 1.5 Watts

For a 6S lipo:
- A 1C charge (5A) needs 22.2 x 5 = 111 Watts
- A 2C charge (10A) needs 22.2 x 10 = 222 Watts
I like to use the charged voltage on these equations because as the pack charges and the voltage increases, it will require more wattage.

A cell that is drained is 3.7v but when charged is actually 4.2v.

So those 6s 5000mah packs are really 25.2v when charged so they use 25.2 x 5a= 126w


Quote:
Originally Posted by twistedge View Post
So, if your goal is to charge a 6S 5000mAh lipo at 2C, you would need:
- A 10A charger that rated for more than 250W
- A power supply that is rated for even more than this
Mostly everyone will say, buy the most charger you can afford as this will prevent you from having to upgrade sooner than later.

Consider whether you think you will ever have the need even in the future to charge multiple 6s packs at the same time using a parallel charging board. If that is the case then consider one of the upper level chargers which can put out over a 1000+ watts. This will also insure you won't probably ever have to upgrade down the road.

Quote:
Originally Posted by Hover View Post
Thanks for the quick reply, very helpful. So, if I buy a charger that is rated at say 400 watts, would this server power supply work, assuming the charger input is 11-24v. At 2C charge rates, about how long would it take to charge a 4s-5000mah Lipo pack, and does it matter what the C rating on the battery is? Sorry, but I'm just trying to learn this stuff lol.
yes these power supplies will work beautifully

on a 2c charge rate, technically should take 30min, but most likely will be done in 20min on a good charger and taking into account most of us only drain packs to the 80% rule (only use 80% max of the mah on the pack)

The c rating on the charging spec is what is important for faster charging. NOT the discharge c rating

discharge c ratings are the numbers that stand out first on a pack, the ones that read 25-50c, 45c, 45-90c, 65c, 65-130c etc.

The charging c rating is sometime on the main sticker, sometimes its on the fine print on the back of the pack, and sometimes it doesn't even say and you need to look it up on the companies website.

Most packs these days are 5c or more charging capable.

There are definitely still some 1c charge capable packs out there so try not to buy those ones if possible

Oh and BTW, no need for apologies . I always say no question is a stupid question, asking questions is what helps you learn
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Goblin 700 comp(BNIB)
Blade 450x, every lynx/blade upgrade available--PARTING OUT(CHECK CLASSIFIEDS)
HK Clik and RC Foam Factory Click super-lite(BNIB)
Losi Mini 8ight--Leopard LBP2838, HW 10BL60, BK 5001, Shumacher Rally's+Pins, Rhino 1050mah 40c
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Old 10-23-2014, 11:25 AM   #49
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Re: 12v and 24v+ high output power supplies

Quote:
Originally Posted by gixerfien View Post
I wanted to start off by saying thanks Ed, saved me some typing lol


It will be 100% fine, no issue



I like to use the charged voltage on these equations because as the pack charges and the voltage increases, it will require more wattage.

A cell that is drained is 3.7v but when charged is actually 4.2v.

So those 6s 5000mah packs are really 25.2v when charged so they use 25.2 x 5a= 126w



Mostly everyone will say, buy the most charger you can afford as this will prevent you from having to upgrade sooner than later.

Consider whether you think you will ever have the need even in the future to charge multiple 6s packs at the same time using a parallel charging board. If that is the case then consider one of the upper level chargers which can put out over a 1000+ watts. This will also insure you won't probably ever have to upgrade down the road.



yes these power supplies will work beautifully

on a 2c charge rate, technically should take 30min, but most likely will be done in 20min on a good charger and taking into account most of us only drain packs to the 80% rule (only use 80% max of the mah on the pack)

The c rating on the charging spec is what is important for faster charging. NOT the discharge c rating

discharge c ratings are the numbers that stand out first on a pack, the ones that read 25-50c, 45c, 45-90c, 65c, 65-130c etc.

The charging c rating is sometime on the main sticker, sometimes its on the fine print on the back of the pack, and sometimes it doesn't even say and you need to look it up on the companies website.

Most packs these days are 5c or more charging capable.

There are definitely still some 1c charge capable packs out there so try not to buy those ones if possible

Oh and BTW, no need for apologies . I always say no question is a stupid question, asking questions is what helps you learn
Thanks for clearing up the C rating questions, I've learned more this morning here than in the last two weeks surfing around the net. I just need to search for a charger, preferably one that is fairly automated..eg: balancing for storage, memory, etc. Any suggestions appreciated, as there are so many out there, many probably copied but with different labels. Looked at a few with ac/dc but don't know if that's the way to go.
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Old 10-23-2014, 11:38 AM   #50
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Re: 12v and 24v+ high output power supplies

Quote:
Originally Posted by Hover View Post
Thanks for clearing up the C rating questions, I've learned more this morning here than in the last two weeks surfing around the net. I just need to search for a charger, preferably one that is fairly automated..eg: balancing for storage, memory, etc. Any suggestions appreciated, as there are so many out there, many probably copied but with different labels. Looked at a few with ac/dc but don't know if that's the way to go.
lol, glad we could help

myself, I own a hitec x2-400. Has dual 400w sides so 800w total.

Hitec chargers are restricted to 18v inputs so i use a paralleled server power supply setup(using two 12v units) that puts out 1150w at 12v.

Having said that, I plan on switching over to either revolectrix or icharger at some point(most likely icharger for me, but still undecided).

IMO, the revolectrix and icharger and the BEST chargers out there.

That AC/DC chargers out there are limited to mostly 80w. I think there's one that does 120w but I think that's only when hooked to dc and still uses only 80w off ac.
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Goblin 700 comp(BNIB)
Blade 450x, every lynx/blade upgrade available--PARTING OUT(CHECK CLASSIFIEDS)
HK Clik and RC Foam Factory Click super-lite(BNIB)
Losi Mini 8ight--Leopard LBP2838, HW 10BL60, BK 5001, Shumacher Rally's+Pins, Rhino 1050mah 40c
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