Meanwell 1000 and 1500W power supply as FAST charger

[Doctorbass]

I thought it could interest many of you for fast, sinmple and efficient charging solution for up to 12s lipo

here is what i responded to anotehr member about my meanwell psu:


Hi,

I have the RCP1000 and RSP1500 Meanwell power supply and they are really nice and easy to use to charger battery.

no need of external modifications. But to get a wider voltage range adjust you need to install an external potentiometer. The RSP-1500-48 can do from 38 to 56Vdc at up to 1650watts dc output from a 15A 120Vac outlet... drived at 17A

It will top at 37A max . It naturally do the CC-CV with a max of 1650W output.

Pay attention that this power supply will ALWAYS try to push the output to the max up to 1650W on any voltage until it taper to the adjusted desired voltage.

That mean a fully empty 12s battery will receive a kick of 1650W right on starting charging.. and it will not fade up the power as some lithium battery need to last longer.

So this powerfull power supply must be used on battery that are never FULLY discharged .. and that at least have 10% state of charge minimum.

I recently got the RCP1000-48 that is half the size of the RSP1500 and put 1250W out!!!.. I paid it 125$ on ebay.. not bad!!


Meanwell ALSO have the RSP1000 of half size the 1500

The RCP serie have less range of voltage adjustement and can only do like 47 to 50V compared to the RSP that can do 38 to 56V

Also the 1500W model will overload many 15A 120V outlet since it will draw close to 17-18A.. at 1650W output some breaker will hold it.. some NOT.. and they will trip... unless you connect them on the 240V, you might have some problem on keeping your 120V 15A brreaker holding that load.. but 90% of the time it work for me :wink:

The only way to reduce power is to reduce the voltage manually but you will need to constantly readjust it to keep the current level you desire during the charge process...

The great solution is the RSP1000 that can still give 1250W DC output! and will not overload the 15A outlet... it will draw max 13-14A... and will out 25A DC and it cost less.... brand new is like 323$ wich is excellent price compare to the 432$ for the 1500W version.

http://www.trcelectronics.com/Meanwell/rsp-1000-48.shtml

Doc

 

[Kingfish]

Excellent Doc; your experience on these units is invaluable! Such a nice compliment to the family of wattages discussed and certainly answers the questions I had about moving up to the kW level. 8)

Q: What device did you use to measure DC current, if applicable?

Touché mon frère, KF

 

[Doctorbass]

Excellent Doc; your experience on these units is invaluable! Such a nice compliment to the family of wattages discussed and certainly answers the questions I had about moving up to the kW level. 8)

Q: What device did you use to measure DC current, if applicable?

Touché mon frère, KF

I installed a watt's up meter on the power supply ( similar as the turnigy watt meter)

It record tghe max current, min voltage max wattage etc..

Doc

 

[NeilP]

Hi Luke

What do you know about the SVP 1500 series Meanwells?..I can no longer see the RSP series on the Meanwell site. have you ever used a SPV 1500?

Neil

 

[Doctorbass]

Hi Luke

What do you know about the SVP 1500 series Meanwells?..I can no longer see the RSP series on the Meanwell site. have you ever used a SPV 1500?

Neil

I never use the SPV serie. The RSp and RCP serie are still availlable from TRCelectronics

http://www.trcelectronics.com/Meanwell/power-supply-pfc-rsp1000.shtml

I know they plan on releasing a 2000Wof the SAME size of the 1000W !!!

http://www.meanwell.com/search/RSP-2000/RSP-2000-spec.pdf

THAT'S WHAT I CALL COMPACT !!!

 

[NeilP]

Umm yes, the 2000 looks good.

thinking two in series for a 20s charger at 84 volt

 

[Doctorbass]

Umm yes, the 2000 looks good.

thinking two in series for a 20s charger at 84 volt

or to use just one and to step up the voltage with Dc-Dc connected with input and output i serie.. i am planning on doing that with few isolated dc-dc of 250W in parallel for more current of 48V in 48V out. to get a trimable 96V up to 105VDC

I bought 7 of those on ebay at 19$ each for my two 1500 and 1000W meanwell.


At the cost of loosing a bit of efficieny and output.. maybe 5%.. but it worth!.. instead of the need of complicated connections for serie- parallel 48V connections

Doc

 

[NeilP]

yes, I read a thread of your about that somewhere earlier, but did not really understand what you are doing.

So you are running two DC-DC convertors off the same supply, then connecting the DC-Dc outputs in series to up the voltage?

I am trying to get 84 volts at about 220 to 40 amps...1C to 2C charge rate

 

[Doctorbass]

yes, I read a thread of your about that somewhere earlier, but did not really understand what you are doing.

So you are running two DC-DC convertors off the same supply, then connecting the DC-Dc outputs in series to up the voltage?

I am trying to get 84 volts at about 220 to 40 amps...1C to 2C charge rate

 

[NeilP]

Um yes, that will do it nicely, cheers I see what you mean now

 

[NeilP]

Sorry to chase you again Luke.

Any chance of a link to the DC-DC convertors you found on e-bay. or at least a name/model to search for

All I can come up with on ebay is a 12-24 v dc dc 250w convertor

 

[Spacey]

Or you could just buy a 900w charger set to the exact voltage you need for £140 from various ebike part seller in China?

 

[NeilP]

Too easy :wink:

 

[NeilP]

Well not that easy...just done a few e-bay searches for 900 W charger and nothing under various search terms

Do you have a link to a 84 volt charger? save me a load of searches

 

[Doctorbass]

Two weeks ago I had finally decided to buy one o fthose ecitypower ( BMSBATTERY) charger for trying.

I bought the EMC 2000 wich is a charger that you can adjust teh output voltage and current to get up to 1500W-2000W depending o 120V or 240V version you decided to buy.

I asked to get 100.8V at 15A. I got it.. but i discovered that i can readjust them by myself with the internal pot

Ecity have various charger up to 18000W

If you search for a 900W here it is.. at 88$: http://www.bmsbattery.com/alloy-she...ifepo4li-ionlead-acid-battery-ev-charger.html

This is the list of all their EMC charger: http://www.bmsbattery.com/18-alloy-shell

I am reviewing the EMC-2000 now: http://www.endless-sphere.com/forums/viewtopic.php?f=14&t=29096&hilit=emc+2000



Finally, the lilnk fo rthe 250W 48V to 48V dc-dc: ( 8 units left)

http://cgi.ebay.com/Vicor-V48B48C25...695?pt=LH_DefaultDomain_0&hash=item27b800f3c7

JUMP ON THAT !!!!.. that will convert any 500W 48V charger to 96V or anywhere around 100V perfect for 24s!

 

[NeilP]

Cheers Luke and Spacey

Well seeing that they do a 2000W unit, it rather makes using a Meanwell a bit redundant

Think I will just go for the 2000 unit and save a load cash..one of those is way cheaper than a pair of 1500W Meanwell

Spacey, i read your post again...you said

Or you could just buy a 900w charger set to the exact voltage you need for £140 from various ebike part seller in China?

I read

from various EBAY part seller in China?

and spent ages searching ebay

doh!!



I got a string of PC PSU's charging my pack earlier..good 13 amp charge from 8 of them. 6 at 12v and two at 5 volt.
Would go with all 5 volt and aim for 30 amps, if I can get some more to make up 84 volts

 

[Spacey]

Doh! I do have a 365W 73V charger that I can only get down to 69.4V which is not low enough as I need 66.3V for my 16 cell Lipo to be charged at 4.15V , maybe I should mess with it some more.... would be a shame to waste it. Have ordered a 900W 66.3V charger which should be here in a couple of weeks.

 

[NeilP]

it may be something as simple as changing a pot for one of a larger value, or changing a resistor somewhere. No harm in trying

 

[Spacey]

Actually it's 70.3V and I can't get the potentiometer to go any lower.

I wonder if I can replace the adjuster for some resistors if I measure the resistance of the pot I could maybe guess as to the required resistance to get close to 66.3Volts that I need?

 

[NeilP]

As i say, take the old pot out and fit a different one.

Set it to minimum voltage before you remove it and see if the pot is set to maximum or minimum resistance. It may be setup as a potential divider with each pin connected to a different pad, or may be as a variable resistor, with two pins set common. You will have to work that out, and see if you need a higher value pot or maybe need to change a resistor that maybe in series with it on the board

 

[Spacey]

Yeah I reckon you are right, I measured 2.36k resistance on the pot at minimum.... wish I knew more about electronics lol.

Good job I managed to build some synthesizers up and have lots of spare parts. Looking for another pot now.

 

[NeilP]

Wish I did too

Would have expected the pot to be either at min or max value when the voltage is at minimumj. Did you take the pot off the board before measuring it? If not you may be measuring the value of other components on the board.

Can you tell how the pot is wired?as a potential divider...each pin connected to a different connection on the board? or are two of the pins connected common ..so the tap is connected to one end of the resistance.

It It seems strange for a pot to have a value like that at minimum..would have expected zero at minimum.

Work out if it is connected as potential divider ( three pins separate) or as variable resistor ( tap common to one end)

if it is connected as variable resistor and minimum setting is minimum voltage, then you may need to change board resistor values too. Remember i am not an electronic engineer either...just going on what i have picked up playing with the Meanwells and PC PSU's in the past few months

 

[Spacey]

Found a 10K Volume control pot that should work nicely, all the others were 50k pots.

 

[Spacey]

Well I was going to take a photo but my camera suck arse, it's connected to the board with 2 of the prongs soldered to one trace and the last...not sure where that goes.

I reckon if I de-solder it and then solder in some wires connected to the new 10K pot and make an attachment on the power supply so I can dial in the voltage it should work. I will of coarse have the new pot on minimum before I test it. If it breaks the power supply then it's not the biggest loss in the world as I have another on order and this one is useless to me for charging 16 cell Lipo as I have to watch that it doesn't go over 4.2v a cell.

 

[NeilP]

Well if two of the pins are connected to one trace, take it off and measure the resistance of the removed pot again in minimum voltage position. If the pot is at minimum value between the two common prongs and the last then, what ever value pot you replace it with, will not lower the voltage of the supply at all.

All changing the pot to a larger one will do is possible increase the supply voltage as the pot is turned up.

I would suspect that you may need to trace the traces either side of the pot back, until you come to another resistor (hopefully) check the value of that and replace that with a lower one....


BTW...what is the supply you are playing with? there is always a chance you may be able to find a schematic of it...or fins someone else on here that has already done what you are doing



Just a thought..how much extra voltage do you need to drop below PSU supply minimum....a diode drops 0.5 v ( or is it 0.7v) ...or a resistor on the output side...maybe enough to get the voltage down to where you need it to be..and keep the PSU standard