EMC-2000 charger from ecity (1500 to 2000W)

Batteries, Chargers, and Battery Management Systems.
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Re: EMC-2000 charger from ecity (1500 to 2000W)

Post by electraflyit » May 10 2012 10:05pm

Are the 900w still availible? Can't see them on the BMS site
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Re: EMC-2000 charger from ecity (1500 to 2000W)

Post by Indubitably » Jan 14 2013 6:33pm

So I bought one of these bad boys about a year ago (EMC 2000) and at the time I was using a 68.5v pack, but recently decided to down size to a 24v pack (3.6v * 7 thundersky 40a) to run a geared RC motor system. I've never had any trouble with the charger at the original 68.5v setting, but the moment I adjusted the voltage down to 25v it just sat there like a bump on a log without so much as attempting to charge the battery. I've got one of the newer models that (presumably) tells you what voltage you're at on the panel without needing any fancy resister tricks, so I'm fairly certain I've got the voltage dialed in (I adjusted w4011 until I was in the ballpark of 25v, then adjusted w503 until I hit a steady voltage) but the charger seems to think that I'm already done charging or something no matter what voltage I use (kicks on the fans for a second at start up, but then sits there doing nothing with both the green and red leds on, and reads 0 current no matter how I tweak W401 and W402).

Anyone have any suggestions? I'd like to eventually trick it out to function as a lab power supply for my robot/cnc projects, but for the time being I'd be happy just to see this thing running at about 26v and say 50A (it had a habit of tripping the breaker for anything but the 20a 120v washing machine line at 68v/25a, and I think 50a should be more than fast enough even for thunderskys).

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Re: EMC-2000 charger from ecity (1500 to 2000W)

Post by IBScootn » Jan 20 2013 12:48pm

How are these working for folks? Might get one for home charging. Wish I could hit it in my e-moto, but looks like two 900w units in parallel is the best i'll be able to.
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Re: EMC-2000 charger from ecity (1500 to 2000W)

Post by Indubitably » Jan 23 2013 4:13pm

I don't know about the 900w units, but the "2kw" units are pretty heavy. I dare say that you wouldn't want one tagging along for the ride on anything built for performance, even something in the motorcycle or scooter weight class. I suppose it might be worth the sacrifice for the right combo of high torque, and lack of convenient access to anything but 15amp sockets, in a utility vehicle just barely heavy enough to haul it along without noticing much difference in weight. I've been looking at throwing a 6kw RC motor behind a 258:1 winch gear box to create delta-style utility e-trike that may find itself in that awkward middling weight class though, so I'll let you know how it turns out, but I'm kind of doubting that my efficiency is going to be too terribly high considering that those gear teeth don't look like they were machined to a terribly high tolerance.

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Re: EMC-2000 charger from ecity (1500 to 2000W)

Post by heathyoung » Jan 23 2013 5:05pm

Chargers in that power class usually are pretty heavy - the stock 1.5KW from the vectrix weighs 15kg.
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Re: EMC-2000 charger from ecity (1500 to 2000W)

Post by megacycle » Jan 23 2013 7:18pm

How much do the case weigh compared to the bare boards?
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Re: EMC-2000 charger from ecity (1500 to 2000W)

Post by Kepler » Jan 24 2013 6:32pm

Once modded with external adjustable voltage, current and momentary switch for activation without attaching a battery, could you actually use the 1200W or 2000W model as a lab power supply?

I want to bench run and test new controllers and motors without the need to use a battery. Always a bit scary with LiPo and bench testing as if anything goes wrong, the battery just keeps on supplying current until components blow. Using the charger as lab supply would be ideal for this.
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Re: EMC-2000 charger from ecity (1500 to 2000W)

Post by Indubitably » Jan 26 2013 9:38pm

Mega: Not all that much really, the transformer is obviously your major stumbling block when it comes to weight. I suppose you could make it work with a coreless or aluminum wire transformer if you could find a way to cool it fast enough and were willing to trade volume for weight.

Kepler:

My understanding is that you can in fact use it as a lab power supply with some minor modifications. I'm still trying to adjust the voltage myself though, so I can't honestly vouch for the convenience of such a mod from personal experience.

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Re: EMC-2000 charger from ecity (1500 to 2000W)

Post by megacycle » Jan 27 2013 1:56am

I wonder what the difference is between my RSP 3000W im using and ecity 2000W.
The RSP being only 4kg with about 0.5kg of case and bars.
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Re: EMC-2000 charger from ecity (1500 to 2000W)

Post by Doctorbass » Jan 30 2013 3:25pm

megacycle wrote:I wonder what the difference is between my RSP 3000W im using and ecity 2000W.
The RSP being only 4kg with about 0.5kg of case and bars.

The RSP case is way much lghter than the ecity extruded aluminum frame!!

Plus they have a true PFC circuit.. not a fake psc like the ecity have

The TRUE PF of the ecity is about 0.75 while the PF of the meanwell is trully corrected with a perfect note of 1.00!

A better PF mean less amp draw on the AC input to give the same amount of DC power at output.

Wich mean the meanwell are alot more efficient.

if only we could play with the current limit of the meanwell RSP serie!.. On the two RSP 1000 i have i removed hald theoutput shunt resistor to cut the current in half and it worked well.. but i wuld preffer finding the right smt resistor to trick with a pot.... I spend hours on that without positive result. the desing is much more complicated

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Re: EMC-2000 charger from ecity (1500 to 2000W)

Post by megacycle » Jan 31 2013 3:51pm

I meant to speak more with Fetcher on this, as he was very impressed with the RSP3000 as a lot of people are me included, when i see it pumping 140+A@ 24V+ into pack for a short period on start unreal, i used 6mm2 cable initially, but when the insulation was melting changed out for short 4G :D, i might push it to see if i can trip its over current soon :mrgreen: .
Fetcher indicated a high likelyhood of current control built in to it, the daughter board has additional current tweaking control circuitry which i have honestly, been scared of touching, as it costing me around US$800, but would say well worth it, id say definitely one of my best even purchases.
With the PFC doc yeh drawing 3kW@even say 230V is 13A would be over 17@ 0.75PF, so need this otherwise need bigger than a 15A outlet here in Aus and bigger than 13A on ring in UK.
A couple of these modded for current control Doc, maybe, on your new build doc?
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Re: EMC-2000 charger from ecity (1500 to 2000W)

Post by GCinDC » Feb 20 2013 8:20pm

NeilP wrote:Ref EMC 1200
rolf_w wrote: 1 = W503 ; turn CW to increase V_out ; range 57V - 116.5V if W4011 set to max V_out
1a = W502 ; is for ??? (not mounted)
2 = W501 ; is for LED lamp indicator adjustment
3 = ?W401? ; is for current adjustment (can't see the label)
4 = W402 ; is also for current adjustment ( probably the fine or coarse)
5 = W4011 ; turn CCW to increase V_out ; shifts the range of W503, kind of offset?; I tried W503 ranges for a number of fixed W4011 positions e.g. 47.0-105.7V, 42.5 - 96.0, 32.5 - 73.5, 28.0 -63.5; I was able to trim down V_out minimum to 2V!
6 = ?
7 = ?

rolf
6 = Display voltage calibration
7 = Display Current calibration

Image
anyone know figure out how exactly to adjust the current, re 3 & 4 above?
is it ok if i up the voltage from 83V to 99 and THEN adjust the current down to match 900W, for the 900W charger?
or should first try to drop the current from 10A to 9A before adjusting up the voltage? I'm planning to use a watts up meter across 4 cells of the 24 to see the amps..

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Re: EMC-2000 charger from ecity (1500 to 2000W)

Post by NeilP » Feb 27 2013 5:01am

I would wind the current down first, then up the voltage

I added my pic of the internal of my EMC2000 to the wiki

http://www.endless-sphere.com/w/index.p ... MS_Battery
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Re: EMC-2000 charger from ecity (1500 to 2000W)

Post by mj2412 » May 26 2013 4:08pm

Hello, i have thte EMC-1200 charger with the 84V 11A setting. Now i went up to 24s Lipo and tried to adjust the voltage. Unfortunately i only can adjust up to 95Volt. Therefore arouns 5 Volts are missing. I'm thinking about to change the resistors to get up to the desired voltage. Does anybody has experience with it.
Thanks for any help.
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Re: EMC-2000 charger from ecity (1500 to 2000W)

Post by dnmun » May 26 2013 5:37pm

i could not get the 72Vlifepo4 EMC-1000 to adjust above 97V. if you look at the daughter board where the #1 or '503' trimpot is on the end you will see a small 1/4W resistor in line with the wiper of the trimpot to ground there. i tried unsoldering and picking up one end, and i put another 2k resistor in parallel but neither would get the voltage beyond 97V and i also tried the other one down on #5 where i could add a resistor in parallel to the resistor there and nothing would get it above the 97V.
Last edited by dnmun on May 27 2013 3:26am, edited 1 time in total.

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Re: EMC-2000 charger from ecity (1500 to 2000W)

Post by NeilP » May 27 2013 12:38am

I believe you need to look for s zener somewhere that gives overvoltage protection.
I think my 1200 is set for 34 series, about 140 volt,

I can look and see what values, but don't know where to look. If someone takes a detailed labelled pic of relevant part of their board, I can compare with mine and post values.

But why did you order a lower voltage and try turning up? Advice on here has always been to order high and turn down , be it a BMS, Meanwell or any SMPSU
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Re: EMC-2000 charger from ecity (1500 to 2000W)

Post by mj2412 » May 27 2013 1:01am

Hello Neil, the last question i can answer easily. By mistake. I was under impression nearly two years ago that BMSBattery needs the nominal voltage not the hot one. The charger is unused, so maybe i will try to sell it and buy a new one.

Thanks for the help.
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Re: EMC-2000 charger from ecity (1500 to 2000W)

Post by NeilP » May 27 2013 2:15am

If someone can come up with pics of the components that determine voltage, then I can look at mine and give you the values.

For now take pics of yours, the main board and small daughter board, and I can do the same on mine
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Re: EMC-2000 charger from ecity (1500 to 2000W)

Post by dnmun » May 27 2013 3:32am

you already have it. the picture of your charger shows the transformer with the 120V rating label. his has one that says 72V.

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Re: EMC-2000 charger from ecity (1500 to 2000W)

Post by NeilP » May 27 2013 4:26am

OK, I'll put it another way,
I am not electronically experienced enough to be able to identify which parts control the output voltage.

I am happy to help, but will need a photo, annotated in Photoshop, with arrows pointing to the exact individual components that need to be changed so i can look on my charger and look at the same components and get the values off them, so the mod can be made to the other charger.

Happy to help, but I have many other jobs on, will help with this if I can, but not to the degree of having it become a major research project for myself. £ e-bikes, a tractor and a Harley that need my attention, plus strimming the weeds down around 5 acres of horse fencing
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Re: EMC-2000 charger from ecity (1500 to 2000W)

Post by dnmun » May 27 2013 4:29am

he would replace the transformer with one that has 120V label on it. then it would be capable of tuning to 100V.

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Re: EMC-2000 charger from ecity (1500 to 2000W)

Post by NeilP » May 27 2013 4:59am

OK< I see what you are getting at now,
Maybe the 1200 is similar to the 2000, I have not got a picture of the 1200 unit. My pictures are of the 2000 watt unit, the unit we are currently discussing is the 1200..though it is probably very similar inside and the mod you are mentioning is probably similar.
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Re: EMC-2000 charger from ecity (1500 to 2000W)

Post by mj2412 » May 27 2013 5:40am

Neil,
thank you for your help. The 1200 has the poti arranged the same way than your picture of the 2000. I will check the transformer and then i will decide how to go further. I think changing of the transformer is critical, because mayby some caps or Mosfets are also rated to 100V. Then i will blew up this components.
Martin

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Re: EMC-2000 charger from ecity (1500 to 2000W)

Post by dnmun » May 27 2013 9:39am

the transformer cannot be replaced. it is easier to just buy the right charger.

if you wanna go to 100V or higher you can build a hyrid charger using a 24V power supply in series with the 72V charger and that will give you 100V at 12A.

that way you do not have to modify the power supply since it is in series with the charger which regulates the current, and you do not have to replace the output caps with high voltage 150V caps.

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Re: EMC-2000 charger from ecity (1500 to 2000W)

Post by NeilP » May 27 2013 11:10am

dnmun wrote:the transformer cannot be replaced. it is easier to just buy the right charger.

arrrrr..no w you say that :lol: I did think that was a bit ambitious, but thought since you were suggesting it, it must be a viable option


Trouble with series'ing power supplies is it gets out of hand..I now have a string of 16 PC supplies in series on the bench, to give me any voltage I want.

Here is a string of six of them.


Image
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