## MeanWell Mods - S-350-48

DrkAngel   100 GW

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### MeanWell Mods - S-350-48

MeanWell Mods
MeanWell Mods - S-150-5
MeanWell Mods - S-150-12
MeanWell Mods - S-150-24
MeanWell Mods - S-150-48
MeanWell Mods - S-240-48
MeanWell Mods - S-350-48

See- ES Wiki MeanWell Mods for more

MeanWell S-350-48
S-350-48.JPG (42.06 KiB) Viewed 3874 times

Specs:

Mean Well S-350-48
350w max continuous output
48V - adjustable from 41V - 56V
7.3A max continuous output@48V -
48V x 7.3A = 350W
Thermal regulated fan
Factory Specs

Problem:

Rated at 7.3A, but will surge-sustain much higher, burning components

Solution:

Restrict the amp output -
The "R33" resister is the key to regulating amperage.

For testing purposes, I soldered 2 wires of a 2s balance plug to the ends of the R33 resister.
Then plugged a multi-turn 2K Pot (potentiometer) into the balance connector.
Then I lowered the voltage to minimum and applied "load".
Removing and measuring the pot's ohms at each 1/2 amp mark.
(Pot must be removed to measure! "In circuit" it is laid parallel with R33.)

Restricting Current (Amps):

9.1A = (OEM resister only) .350K = 350ohm
7.9A = 2.000K = 2000 ohm
7.5A = 1.432K = 1432 ohm
7.3A = 1.200K = 1200 ohm
7.0A = 1.000K = 1000 ohm
6.5A = .775K = 775 ohm
6.0A = .580K = 580 ohm
5.5A = .458K = 458 ohm
5.0A = .368K = 368 ohm
4.5A = .288K = 288 ohm
4.0A = .225K = 225 ohm
3.5A = .180K = 180 ohm
3.0A = .132K = 132 ohm
2.5A = .098K = 98 ohm
2.0A = .065K = 65 ohm
1.5A = .038K = 38 ohm
1.0A = .013K = 13 ohm

Disconnect, or remove R33.

Amps ........ Ohms
1A ... from ... ? ohms
2A ... from ... ? ohms
3A ... from ... ? ohms
4A ... from ... ? ohms
5A ... from ... ? ohms
6A ... from ... ? ohms
7A ... from ... ? ohms
8A ... from ... ? ohms
9.1A ... from ... 350 ohms
10A .. from .. ? ohms
11A .. from .. ? ohms
12A .. from .. ? ohms
13A .. from .. ? ohms
14A .. from .. ? ohms
15A .. from .. ? ohms
16A .. from .. ? ohms
17A .. from .. ? ohms
18A .. from .. ? ohms
19A .. from .. ? ohms
20A .. from .. ? ohms
etc.

Need lower voltage high drain rig to determine higher amps.

Not precise ... used analog amp meter.

Widening the voltage range:

By changing the value of the Voltage pot, I was able to lower the output range substantially.

1K = 38.3 - 56.7V (oem)
2K = 29.8 - 56.7V
5K = ? - 56.7V (<20V - 56.7V estimated)
10K = ? - 56.7V
20K = ? - 56.7V
100K = ? - 56.7V

As I will demonstrate later, there can be great advantages to lower voltages.

Note! The higher value pots (100K etc) only allow a very "coarse" adjustment at the high voltage end. Harder to fine adjust.
Lowering Voltage

Lowering voltage could take advantage of higher amperage.
Without removing components, amperage is regulated below 9.1Amps.
R33 has a measured resistance of ~350ohms.

Component View

Raising Voltage?

Not tested ... or recommended!
This model has 63V caps ... a fairly strict limitation!

350 Watt!

To be safe and effective, amperage should be adjusted as voltage is altered.
Volts x Amps = Watts
Watts should equal, or be slightly below, 350 watts.

56V x 6.25A = 350w
55V x 6.36A = 350w
54V x 6.48A = 350w
53V x 6.60A = 350w
52V x 6.73A = 350w
51V x 6.86A = 350w
50V x 7.00A = 350w
49V x 7.14A = 350w
48V x 7.30A = 350W
47V x 7.44A = 350w
46V x 7.60A = 350w
45V x 7.77A = 350w
44V x 7.95A = 350w
43V x 8.13A = 350w
42V x 8.33A = 350w
41V x 8.53A = 350w
40V x 8.75A = 350w
39V x 8.97A = 350w
38V x 9.21A = 350w
37V x 9.45A = 350w
36V x 9.72A = 350w
35V x 10.00A = 350w
34V x 10.29A = 350w
33V x 10.60A = 350w
32V x 10.93A = 350w
31V x 11.29A = 350w
30V x 11.66A = 350w
29V x 12.06A = 350w
28V x 12.5A = 350w
27V x 12.96A = 350w
26V x 13.46A = 350w
25V x 14.00A = 350w
24V x 14.58A = 350w
23V x 15.21A = 350w
20V x 17.50A = 350w
15V x 23.33A = 350w
10V x 35.00A = 350w
5V x 70.00A = 350w

Yeah ... I'm gonna try pushing everything to the limits ... and then a little further!

(Will test to confirm)
In Series

"In series" is when the negative of one power supply is run through the positive of another - combining their voltages.

Important!

When run in "series" the DC "negative" must be isolated from the 110AC negative ... on all but the primary unit!. Otherwise, the DC positive from the primary unit will "short" through the AC negative on the secondary unit.

The negatives are usually connected through the "ground".
Not confirmed yet!!!
It appears the S-350 series is ready for "in series" with no mods!
Not confirmed yet!!!

Submitted to Endless Sphere WIKI

MeanWell Mods - S-150-24 Mods w\Instructions

MeanWell Mods

S-150-5
S-150-12
S-150-24
S-150-48
S-240-48
S-350-48
Attachments
S-350-5-1.pdf
Last edited by DrkAngel on Sep 04 2018 6:06pm, edited 14 times in total.
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DrkAngel   100 GW

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### Re: MeanWell Mods S-350-48

I finally built my 33.3V 43.2Ah (9s20p) LiPo battery pack and needed a charger.
I had planned to VET the S-350-48 and finally had a good reason.
Filled in all mod info except increasing Amps.
Though I did spec out the Amp regulation mods, my pack will be perfect with the oem Amp limit.

I intend on charging to 4.05V = 36.45V and (4.15V = 37.35V for trips).
350w / 36.45V = 9.6A ... 9.1A oem limit will work nicely with an extra safety buffer.
(350w / 37.35V = 9.37A)

Fan Mod
There is a fan mod posted, by shorting across some points ...
I just cut the neg fan wire and ran it to the DC neg ... works fine!
Charging 42Ah battery at 9.1A, I will want the fan to run constantly!
A little learning is a dangerous thing;
Drink deep, or taste not the Pierian spring:
There, shallow draughts intoxicate the brain,
And drinking largely, sobers us again.

I enjoy enlightening ... and enlivening the spirit of the innovators.

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2007blueprius   100 W

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Joined: Jun 17 2013 11:27am

### Re: MeanWell Mods S-350-48

how did you go about figuring out all these mods, are you that smart? had schematics? I tried the same with pc PS had some success modding one to adjust voltage no Idea how to go about amps, thou that does not seem to be much of an issue , just curious, I look up to you and what you have done quite a bit. Always been a fan of the underdog, any daddys idiot can throw money or borow and default on payments at brand new plug and play stuff that may not even compare to your cheap setups, and that I think it's the beauty of what you are doing, my grandpa used to call it: " making a whip out of horseshit " and it snaps too.

DrkAngel   100 GW

Posts: 5435
Joined: Dec 15 2010 11:14am
Location: Upstate-Western-Southern Tier NY. USA

### Re: MeanWell Mods S-350-48

2007blueprius wrote:how did you go about figuring out all these mods, are you that smart? had schematics? I tried the same with pc PS had some success modding one to adjust voltage no Idea how to go about amps, thou that does not seem to be much of an issue , just curious, I look up to you and what you have done quite a bit. Always been a fan of the underdog, any daddys idiot can throw money or borow and default on payments at brand new plug and play stuff that may not even compare to your cheap setups, and that I think it's the beauty of what you are doing, my grandpa used to call it: " making a whip out of horseshit " and it snaps too.
To a large extent, I expound upon the work of others.
I hunt and investigate info on certain quality-useful-moddable, readily available items.
Then, using basic methods, I investigate, test, mod, document ...
I would rate myself as intelligent, blessed-cursed with an ingenuity which might be partly attributable to a degree of dyslexia, I see things differently than most people.
I am very much a system rather than a component thinker.
I amass a horrific amount of info then process it, almost subconsciously at times, when needed.

Most importantly, I try to provide clear and complete info-instructions.
I will add current regulation mods as well as pictures.
Last edited by DrkAngel on Aug 07 2014 5:14am, edited 2 times in total.
A little learning is a dangerous thing;
Drink deep, or taste not the Pierian spring:
There, shallow draughts intoxicate the brain,
And drinking largely, sobers us again.

I enjoy enlightening ... and enlivening the spirit of the innovators.

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Thud   100 MW

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Location: West Michigan,USA

### Re: MeanWell Mods - S-350-48

Expounding from this thread is kinda easy
http://endless-sphere.com/forums/viewto ... =14&t=4125
I think there is another word for it to......

Kingfish has another model mod thread....with good info in it.....i never book marked that one though.

These are fantastic to control amperage without getting int serious mods & work with the newer PS's that go into hicup mode when over burdened
http://endless-sphere.com/forums/viewto ... 31&t=36958
get some......

All information & advice provided by Thud are "Open Source" & free for personal use & distribution under the following agreement linked below.

DrkAngel   100 GW

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Joined: Dec 15 2010 11:14am
Location: Upstate-Western-Southern Tier NY. USA

### Re: MeanWell Mods - S-350-48

Added S-350-48 to MeanWell Mods in Endless Sphere Wiki
I am concentrating on the "S Series".
S-150-24 is complete, S-150-15 and S-150-5 are largely complete.
S-350-48 is complete except for increasing Amp limit.
And have begun S-350-24.
Still have some S-320-xx to test

The S (Standard) Series is an older "simpler" version MeanWell that lends itself to simple mods.
Later models added features and redundancies that make "simple" mods ... "difficult"?
A little learning is a dangerous thing;
Drink deep, or taste not the Pierian spring:
There, shallow draughts intoxicate the brain,
And drinking largely, sobers us again.

I enjoy enlightening ... and enlivening the spirit of the innovators.

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DrkAngel   100 GW

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Joined: Dec 15 2010 11:14am
Location: Upstate-Western-Southern Tier NY. USA

### Re: MeanWell Mods - S-350-48

Oh ... Fun?
Bid low on a "New" MeanWell S-320-5 ... and won ...
4.5-5.7V 50A! ... What could anyone ever use that for?

Run in series, it could properly current regulate an HP ESP120 (51.4V 57A) switching power supply as a 50A charger for a 48V large battery pack.

48.1V 13s x 4.2V = 54.6 (51.4V + 3.2V = 54.6V)

5.7V from the MeanWell is preferable. (5.7V x 50A = 285w)
(13s x 3.7V = 48.1V and 48.1V is lower than 51.4V from the ESP120,
and MeanWell would perform no regulation,
54.6V - 5.7V = 48.9V which is still more than 48.1V but the .8V voltage differential ("pressure") should draw less than 50A! ... ?)

I will have to implement voltage mods on the ESP120 but I have leads-clues on how to accomplish them.

If successful, and to what voltage modable, might work nicely with a 44.4V 12s x 4.2V = 50.4V?
Last edited by DrkAngel on Aug 06 2014 7:37am, edited 1 time in total.
A little learning is a dangerous thing;
Drink deep, or taste not the Pierian spring:
There, shallow draughts intoxicate the brain,
And drinking largely, sobers us again.

I enjoy enlightening ... and enlivening the spirit of the innovators.

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Arlo1   100 GW

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### Re: MeanWell Mods - S-350-48

OK Im going to jump on board. I have about 10 blown MW 350w 48v supplies. All have q1 and q2 blown. So here is my suggestion lets find a better transistor is it as simple as selecting a higher amp rated transistor? http://www.digikey.ca/product-detail/en ... -ND/810925 This one is 24 amps which is 9 amps more then the old one or 60% more so would someone be able to run 60% more amperage out of the unit? Even If I could mod it to run ~9-10 amps reliably it would be fine. What do you guys think?
I have good luck up to 8 amps with a 48v supply but past that and they pop. Not to mention I order the cheep ones from ebay so I bet the 2sc3320 is cheep and might even be knock offs of something making them less reliable.
Does your project need a high performance motor drive, battery charger or other power electronics developed? Let's talk!
www.powerdesigns.ca
Leaf motor controller build. http://endless-sphere.com/forums/viewto ... 27#p963227
Never above 4.2v never below 2.7v EVER!!!
Support me on Patreon. https://www.patreon.com/user/posts?u=6842045
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DrkAngel   100 GW

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### Re: MeanWell Mods - S-350-48

Arlo1 wrote:OK Im going to jump on board. I have about 10 blown MW 350w 48v supplies. All have q1 and q2 blown. ...
I have good luck up to 8 amps with a 48v supply but past that and they pop.
48V x 8 amps = 384w
Which is 10% beyond rated capacity.
If used as a Li-ion 13s charger, the ...
54.6 x 8 amps = 436.8w or 25% beyond rated.
These power supplies are not designed for these outputs.

Since the transistors are rated for above 8 amp, then better cooling should be more effective than higher rated transistors.
Most effective would be to limit wattage to 350w, by limiting amperage.
A little learning is a dangerous thing;
Drink deep, or taste not the Pierian spring:
There, shallow draughts intoxicate the brain,
And drinking largely, sobers us again.

I enjoy enlightening ... and enlivening the spirit of the innovators.

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dnmun   100 GW

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### Re: MeanWell Mods - S-350-48

Arlo1 wrote:OK Im going to jump on board. I have about 10 blown MW 350w 48v supplies. All have q1 and q2 blown. So here is my suggestion lets find a better transistor is it as simple as selecting a higher amp rated transistor? http://www.digikey.ca/product-detail/en ... -ND/810925 This one is 24 amps which is 9 amps more then the old one or 60% more so would someone be able to run 60% more amperage out of the unit? Even If I could mod it to run ~9-10 amps reliably it would be fine. What do you guys think?
I have good luck up to 8 amps with a 48v supply but past that and they pop. Not to mention I order the cheep ones from ebay so I bet the 2sc3320 is cheep and might even be knock offs of something making them less reliable.
i am not following this but the big high voltage switching transistors are on the front end so output voltage is not the issue imo. you may be limited in the current you can switch by the saturation of the transformer so a larger transistor may not help. just guessing.

Arlo1   100 GW

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### Re: MeanWell Mods - S-350-48

dnmun wrote:
Arlo1 wrote:OK Im going to jump on board. I have about 10 blown MW 350w 48v supplies. All have q1 and q2 blown. So here is my suggestion lets find a better transistor is it as simple as selecting a higher amp rated transistor? http://www.digikey.ca/product-detail/en ... -ND/810925 This one is 24 amps which is 9 amps more then the old one or 60% more so would someone be able to run 60% more amperage out of the unit? Even If I could mod it to run ~9-10 amps reliably it would be fine. What do you guys think?
I have good luck up to 8 amps with a 48v supply but past that and they pop. Not to mention I order the cheep ones from ebay so I bet the 2sc3320 is cheep and might even be knock offs of something making them less reliable.
i am not following this but the big high voltage switching transistors are on the front end so output voltage is not the issue imo. you may be limited in the current you can switch by the saturation of the transformer so a larger transistor may not help. just guessing.
I was just thinking all my MWs that have died had those transistors pop and it was always over current so....
Does your project need a high performance motor drive, battery charger or other power electronics developed? Let's talk!
www.powerdesigns.ca
Leaf motor controller build. http://endless-sphere.com/forums/viewto ... 27#p963227
Never above 4.2v never below 2.7v EVER!!!
Support me on Patreon. https://www.patreon.com/user/posts?u=6842045
http://www.undergroundelectrics.ca/

Arlo1   100 GW

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### Re: MeanWell Mods - S-350-48

Ok so I got a 36v MW repaired. Had Q1 and Q2 blown and that was it. I tried 3 others so far and one makes noise from T1 and it changes if I push on the plastic. It makes 32v and does not adjust with the pot I belive its a 48v MW so something is not right maybe even T1 it self.
Does your project need a high performance motor drive, battery charger or other power electronics developed? Let's talk!
www.powerdesigns.ca
Leaf motor controller build. http://endless-sphere.com/forums/viewto ... 27#p963227
Never above 4.2v never below 2.7v EVER!!!
Support me on Patreon. https://www.patreon.com/user/posts?u=6842045
http://www.undergroundelectrics.ca/

Arlo1   100 GW

Posts: 8391
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Contact:

### Re: MeanWell Mods - S-350-48

I changed out T1 and it will slowly climb to 52volts when the pot it cranked but if I put any load on it the voltage drops off to almost nothing.... Anyone have any ideas? This is a 350w MW most likely a knock off.
Does your project need a high performance motor drive, battery charger or other power electronics developed? Let's talk!
www.powerdesigns.ca
Leaf motor controller build. http://endless-sphere.com/forums/viewto ... 27#p963227
Never above 4.2v never below 2.7v EVER!!!
Support me on Patreon. https://www.patreon.com/user/posts?u=6842045
http://www.undergroundelectrics.ca/

DrkAngel   100 GW

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### Re: MeanWell Mods - S-350-48

Finally took some quality pictures:

Last edited by DrkAngel on Sep 11 2018 9:56pm, edited 1 time in total.
A little learning is a dangerous thing;
Drink deep, or taste not the Pierian spring:
There, shallow draughts intoxicate the brain,
And drinking largely, sobers us again.

I enjoy enlightening ... and enlivening the spirit of the innovators.

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DrkAngel   100 GW

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### 1000w ≤84V Bulk Charger

Easy (1000w) ≤84V 12.5A charger
63V @ ~16.5A
37.8V+ @ ≥18.2A

2 - MeanWell, or any generic, 350-48 ~7.3A 40-56V switching power supplies
+
1 available and easily modifiable
MeanWell S-350-24 ~14.6A 20-29V
=
16.5-12.5A (adjustable) 60-85V (adjustable) bulk charger! (w/current mod) - For 15s - 20s Li-ion = Lipo
(Oops! will try to finish S-350-24 current mod values.)

+18-12.5A 9s - 20s w/voltage mod on all units - very easy!
(Replace 1k voltage pots with 2k-5k - both units)

Warning!
Check for voltage "isolation"!
Build array without ground wire to 2nd or 3rd components.
Do not let components touch each other.
Check between units to confirm electrically isolated, casing to casing, (0V reading)
Using a line with small fuse, test-connect ground to 2nd unit etc.

Cheap - easy (470-500w) ≤84V 5.5A charger
A little learning is a dangerous thing;
Drink deep, or taste not the Pierian spring:
There, shallow draughts intoxicate the brain,
And drinking largely, sobers us again.

I enjoy enlightening ... and enlivening the spirit of the innovators.

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DrkAngel   100 GW

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### MeanWell Mega-Mod - S-350-48

Reserved for MeanWell S-350-48 Mega-Mod ®

<30-56V
0-10A+

Preliminary usages will be for:
7s 12A through 13s 6.25A bulk charger;
power supply for 20w through multiple 100w High output LEDs

Note: MeanWell S-350-xx models supply comparatively "noisy" current regulation
(I might be experimenting with post regulated "smoothing" using caps or inductors ...?)
A little learning is a dangerous thing;
Drink deep, or taste not the Pierian spring:
There, shallow draughts intoxicate the brain,
And drinking largely, sobers us again.

I enjoy enlightening ... and enlivening the spirit of the innovators.

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Geekineer   10 mW

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Joined: Nov 23 2015 7:42am

### S-150-48 discontinues??

Several sites indicate the Meanwell S-150-48 is discontinued. Found a suggested replacement is the RS-150-48.
Any comments - is it the same - can it be current and voltage tweaked as well.
Thanks for any and all inputs.

DrkAngel   100 GW

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### Re: MeanWell Mods - S-350-48

MeanWell RS-150-48 of unknown-undetermined mod capable. ... unlikely to be amp mod capable. ... ?

Ebay search often turns up MeanWell S-150-48, used and sometimes new.
A little learning is a dangerous thing;
Drink deep, or taste not the Pierian spring:
There, shallow draughts intoxicate the brain,
And drinking largely, sobers us again.

I enjoy enlightening ... and enlivening the spirit of the innovators.

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Geekineer   10 mW

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### Re: MeanWell Mods - S-350-48

Thanks
I hate to go with lame duck...Electric. mechanical specs package look identical msybe ill take a chance....would be nice to see pic of inside.

DrkAngel   100 GW

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### Re: MeanWell Mods - S-350-48

Check this MeanWell Clone it is mod capable. - good price.
Mods described, but no precise values for exact Amps.
I purchased one, but never got around to writing up the exact mods, resister values etc.
A little learning is a dangerous thing;
Drink deep, or taste not the Pierian spring:
There, shallow draughts intoxicate the brain,
And drinking largely, sobers us again.

I enjoy enlightening ... and enlivening the spirit of the innovators.

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knighty   10 kW

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### Re: MeanWell Mods - S-350-48

hi, I've got two S-350-36 meanwells

which I have in series, planning to use to charge an 18s pack

but... they keep tripping out when I connect them up... I'm assuming it's over current limit ? if I match the meanwells/pack voltages, and then only just turn the voltage up, they seam to keep running (ammeter blew up, so can't check amps, just watching the pack voltage)

I connected a 12v headlight bulb in series between the meanwells and the battery, bulb lit, pack voltage rose slightly, meanwells warmed up a little and fans came on
(no heat for fans before this)

assuming I'm right and it's just overcurrent cutout... can you point me in the direction of what resister value I need ?
https://endless-sphere.com/w/index.php/S-350-36#Problem: - doesen't have the info filled in, and I'm a bit lost

thanks

Alan

DrkAngel   100 GW

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### Re: MeanWell Mods - S-350-48

knighty wrote:hi, I've got two S-350-36 meanwells

Alan
Sorry, never purchased an S-350-36 for trials, just started page for future fill-in.

If you can get me an ohm reading on R33, I can probably get you close to optimal.

¿ Otherwise, a 1K pot in parallel with R33 might range <1-10Amp adjustable ? - guesstimate!
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knighty   10 kW

Posts: 535
Joined: Sep 13 2012 8:57pm

### Re: MeanWell Mods - S-350-48

thanks, I'll check R33 tomorrow and get back to you

two in series for 75.6v pack gives 9.25amp charge for 350watts
(but they're ok till about 130% right?)

pretty easy on charge rate here, give or take an amp is no big deal

I'll do the fan mod so it always runs too

thanks

Alan.

krlenjuska   10 W

Posts: 94
Joined: Feb 18 2019 4:50pm

### Re: MeanWell Mods - S-350-48

I have Meanwell LRS-350-24. Is there any easy way to identify resistor responsible for current setting?