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Electric Battery-Charger-pSupply
› Looking for a 1200W PS
06-01-2012 11:47 PM  6 years agoPost 21
Ace Dude

rrProfessor

USA

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Many modern households have 20 amp breakers, or 2200 to 2400 watts depending on the voltage. Some have a mix of 15a and 20a. You just have to check the breaker box when planning out your bench charging setup.
That's why I specifically stated 15A. However, one must also consider the losses when running two power supplies.

  

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06-01-2012 11:59 PM  6 years agoPost 22
Gregor99

rrElite Veteran

Western Wa

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However, one must also consider the losses when running two power supplies.
Losses of two supplies vs one supply? What are the efficiency differences between one vs two supplies?

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06-02-2012 12:30 AM  6 years agoPost 23
TheWoodCrafter

rrKey Veteran

Costa Mesa, Ca.

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I hope everyone understands how this works.
Series = add up the watts and add up the volts, amps stay the same.
Parallel = Volts stay the same but the Amps amd watts go up.

Watts Law says so

V x A = W

Thanks, TheWoodCrafter

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06-02-2012 12:54 AM  6 years agoPost 24
Ace Dude

rrProfessor

USA

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Losses of two supplies vs one supply? What are the efficiency differences between one vs two supplies?
I think we need to consider the individual efficiency of each supply in the system when calculating overall system efficiency.

Can't say I've examined it, but my Meanwell RSP-1500-24 is listed as being typically 90% efficient according to the datasheet. On the same datasheet the Meanwell RSP-1500-12 is listed as being 87% efficient. Now considering two 87% efficient power supplies to make 24v vs. one 90% efficient power supply to make 24v. Make sense?

  

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06-02-2012 01:14 AM  6 years agoPost 25
Gregor99

rrElite Veteran

Western Wa

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Now considering two 87% efficient power supplies to make 24v vs. one 90% efficient power supply to make 24v. Make sense?
Yes, got it. Not where I thought you were going. But yes that makes sense. Server supplies efficiency specs are hard to come by. But generally most are 85% to 90% with APFC. Add two in series and that will not change the efficiency of the total system except for the logic boards and fan which take about 30 watts per unit.

In the end, most of this is just theory since few poeple have chargers that can push the limits. As for myself, I can trip my breaker (two Powerab8s and power supplies to max them out). But its never an issue as I don't charge at high rates at home. In fact I rarely charge my big packs at home. Seems like its the kiss of death. Charge at home the night or morning before and the trip to the field is always cancelled for a variety of reasons.

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06-02-2012 01:26 AM  6 years agoPost 26
Ace Dude

rrProfessor

USA

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Just theory from my point of view. Would be interesting to do some actual hands on testing at some point in the future.

  

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06-02-2012 03:24 AM  6 years agoPost 27
4cyclic

rrKey Veteran

Montreal, Can. and northern Vermont

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I hope everyone understands how this works.
Series = add up the watts and add up the volts, amps stay the same.
Parallel = Volts stay the same but the Amps amd watts go up.
Watts Law says so
V x A = W
Yes, of course watts are watts, was thinking of amps !
amps stay the same, but voltage is double.

thanks for correcting me.

John

Life is meaningful flying helis.

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06-02-2012 05:07 AM  6 years agoPost 28
Paul Woodcock

rrElite Veteran

Dubai - United Arab Emirates

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Hi guys

I live in a 220v country and do travel.... Sometimes to the US and would only consider PSU's that can handle 110-220v.

This is a big issue, for me....

The Ready Heli one meets this requirement.

Regards
Paul

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06-02-2012 06:12 AM  6 years agoPost 29
pctomlin

rrVeteran

Texas

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This is another nice thing about using server power supplies for your source. A lot of them are voltage sensing and automatically switch to the incoming voltage, I know the Dell 6650 does this. The only thing needed is the plug for the country you are visiting. Another little tidbit of info on server PSUs is anything that is hot swapable is APFC.

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