Search found 34 matches

by JoeG
May 16 2019 7:23am
Forum: E-Vehicles General Discussion
Topic: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread
Replies: 168
Views: 46169

Re: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread

You need to remove the trim pot to get the increase voltage mod to work. From the link you listed "Then you need to open up the power supply to remove the potentiometer used to set the output voltage level. The Red Arrow shows the small POT. Remove it and solder a lead to the leg on the side side (c...
by JoeG
Mar 22 2019 5:20pm
Forum: Large EV General Discussion
Topic: Street Legality of DIY Electric Car
Replies: 6
Views: 1816

Re: Street Legality of DIY Electric Car

I converted a 1991 Geo Metro into an EV in 2012 and registered it as an EV with the CA DMV. My conversion has a Brushed forklift motor, an AMD FB1-4001, with a home built from a Paul's kit 600A controller, and 45 100ah CALB Lifepo4 cells. I've been using it as my daily driver around town for 7 years...
by JoeG
Aug 25 2018 4:51pm
Forum: Battery Technology
Topic: Quick Meanwell SP-series question, CC or Hiccup? Datasheet says CC, but posts seem to suggest otherwise
Replies: 4
Views: 318

Re: Quick Meanwell SP-series question, CC or Hiccup? Datasheet says CC, but posts seem to suggest otherwise

I use a SP-200-3.3 which is rated at 40A output to balance charge my 100AH Calb LiFePo4 cells in my Geo Metro EV which has a 45S pack. It is a constant current power supply which I use as a battery charger. I have a monitor system that shuts it off when the desired cell termination voltage(3.5) is a...
by JoeG
Jun 29 2018 4:35pm
Forum: Large EV General Discussion
Topic: Existing build and want to change battery chemistry
Replies: 3
Views: 1252

Re: Existing build and want to change battery chemistry

Chevy Volt batteries from a wreaking yard seem to be the low cost option right now. There is a lot of info on the web on how to re-purpose them for an ev. Check www.car-part.com for packs in your area. Near me, in Los Angeles, CA there are a couple in the $1650-1700 range, which is pretty cheap for ...
by JoeG
Apr 30 2018 9:47am
Forum: Large EV General Discussion
Topic: 400volt charger from server PSU's
Replies: 10
Views: 1618

Re: 400volt charger from server PSU's

I charge my 91 Geo Metro EV (14kw lithium pack) with Meanwell PSU's and one thing I found out was that in America at least, device & circuit ratings are not for continues use. You can only pull 80 percent of a devices rate current continuously, and when doing so, wires & connectors get warm. I have ...
by JoeG
Oct 01 2015 6:14pm
Forum: E-Vehicles General Discussion
Topic: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread
Replies: 168
Views: 46169

Re: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread

Escartiz,
I like your terminal idea better that mine. I got the diodes from Digikey,
http://www.digikey.com/product-search/e ... =APT60S20B
Good luck with your project.
Joe
by JoeG
Jun 07 2015 8:05pm
Forum: E-Vehicles General Discussion
Topic: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread
Replies: 168
Views: 46169

Re: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread

Artur, Sorry to hear that you are having trouble. One of my ESP-120's beeped once then shut down when I put 106V onto the pot pad by mistake. I removed power from the units right away. When I removed the faulty circuit, it restarted and ran with no problem. I would start by verifying all the connect...
by JoeG
May 06 2015 10:27pm
Forum: E-Vehicles General Discussion
Topic: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread
Replies: 168
Views: 46169

Re: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread

My limited ESP120 blew a Mosfet the other day! I was about 15 minutes into a charge and I while I was about 30 feet away in the garage, I heard a loud pop. When I went to investigate there was zero Amps output, no smoke or smell though. Got out the ohm meter and checked each supplies voltage. Found ...
by JoeG
Mar 22 2015 8:02pm
Forum: E-Vehicles General Discussion
Topic: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread
Replies: 168
Views: 46169

Re: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread

I just found these efficiency test results posted over on R/C groups. 89% at 40A out, pretty good. :D
by JoeG
Mar 07 2015 2:10pm
Forum: E-Vehicles General Discussion
Topic: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread
Replies: 168
Views: 46169

Re: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread

The supplies weigh 13lbs, not including any wires or connectors.
by JoeG
Mar 06 2015 8:41pm
Forum: E-Vehicles General Discussion
Topic: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread
Replies: 168
Views: 46169

Re: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread

The circuit I posted above does two things. First it controls the current output by varying the voltage of 1 of the three PSU's, preventing over-current shut down. Second, when it receives an alarm (ground) signal from my 6 cellog BMS , it switches the PSU's to standby mode, and stops the charge. Th...
by JoeG
Mar 03 2015 7:23pm
Forum: E-Vehicles General Discussion
Topic: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread
Replies: 168
Views: 46169

Re: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread

hp 3kw datasheet-1.pdf Artur, Attached is a data sheet for the PSU which has the info. The DC minus is at the upper right 2 tabs, DC plus is at the upper left 2 tabs. I soldered 1/4 x .032 copper blades to bolt ring terminals to. Some folks have soldered wires directly to the tabs also. The AC in i...
by JoeG
Feb 25 2015 9:40pm
Forum: E-Vehicles General Discussion
Topic: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread
Replies: 168
Views: 46169

Re: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread

Hey Heath, Your clean mod of the DPS-600 inspired me to try the above mod on this supply. I have very little experience in electronics, and doing this mod really stretched the brain. So far it has been great fun. I used a hall current sensor because it seemed like the path of least resistance at the...
by JoeG
Feb 23 2015 10:11pm
Forum: E-Vehicles General Discussion
Topic: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread
Replies: 168
Views: 46169

Re: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread

Attached is a schematic of my current control, and supply turn on/off circuit.
Joe
by JoeG
Feb 20 2015 9:46pm
Forum: E-Vehicles General Discussion
Topic: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread
Replies: 168
Views: 46169

Re: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread

I've had mine up to 56V by applying -0.6 volts to the voltage adjust pot pad. At positive 6, it goes down to about 24V. You have to remove the voltage adjust pot to apply the voltages. See attached picture. This mod is based on the work of a German group at this link, http://translate.google.com/tra...
by JoeG
Feb 19 2015 8:01pm
Forum: E-Vehicles General Discussion
Topic: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread
Replies: 168
Views: 46169

Re: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread

Thanks Doc, I had run across your friends work while searching for info on this PSU. After re-reading his Arduino forum posts and the HP info, I can see how you can get data from the PSU, and put it on standby remotely, but that is all I can find. I can't any reference to remote current adjustment. ...
by JoeG
Feb 17 2015 12:03am
Forum: E-Vehicles General Discussion
Topic: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread
Replies: 168
Views: 46169

Re: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread

Success! I charged my EV’s battery today using the bread-boarded charge controller and it worked. I charged at 34A for about an hour, which was 26A 240V AC continuous, about all my temporary 12Ga cord, and 30A garage circuit could handle. The pre-charge, Current control, and charge termination contr...
by JoeG
Jan 01 2015 11:53pm
Forum: E-Vehicles General Discussion
Topic: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread
Replies: 168
Views: 46169

Re: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread

Happy New Year All !!! Glad to see some interest on this thread again. I was busy with the Holidays and haven't done much with my project lately. cts_casemod, for pictures of an open supply, look about half way down page 4 of this thread, I posted a few of mine. Also there are some on this thread ov...
by JoeG
Dec 05 2014 12:02am
Forum: E-Vehicles General Discussion
Topic: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread
Replies: 168
Views: 46169

Re: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread

Hi All, I mounted the 3 PSU’s together using some 1” alum angle, 1” dia wood doweling for carrying handles, ¾” x 1” pine base, & 10-24 threaded rod to tie it together. I didn't end up isolating them, they work fine touching cases like Arlo noted in a prior post. They are pretty heavy at 13 pounds ea...
by JoeG
Nov 19 2014 10:40pm
Forum: E-Vehicles General Discussion
Topic: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread
Replies: 168
Views: 46169

Re: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread

On my ESP120's the mains earth is tied( 0 ohms) to the chassis. Both positive & negative DC terminals show 36K ohms to the chassis. This is how I received the units. As noted in a prior post, not much current will flow with that much resistance. It is good to know that they will run in series while ...
by JoeG
Nov 18 2014 9:46pm
Forum: E-Vehicles General Discussion
Topic: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread
Replies: 168
Views: 46169

Re: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread

No I haven't tried running them with the chassis touching, and you are right that with 36K ohm there won't be much current flow. However, it won't be hard to isolate the chassis when I bolt them together, so I'm going to isolate them just to be safe. I hope to have some time to work on this project ...
by JoeG
Nov 16 2014 3:43pm
Forum: E-Vehicles General Discussion
Topic: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread
Replies: 168
Views: 46169

Re: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread

During testing today I found out that when these units are powered up, the DC output isn't completely isolated from the chassis. There is 2.4V DC to the case from either DC output terminal. When the unit is off there is about 36K ohms resistance to the chassis. So, I guess I will be separating the c...
by JoeG
Nov 15 2014 8:55pm
Forum: E-Vehicles General Discussion
Topic: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread
Replies: 168
Views: 46169

Re: HP ESP120 48V (51.4V) 57A 3KW Server Supply Thread

Hi all, I've just started attempting to build a high power charger for my Geo Metro EV using 3 of these PSU's. I picked up 3 PSU's from Ebay for about $40 ea delivered to my home in Reseda, Ca.. My car pack is a 45S CALB SE100Ah LiFePo4 pack. I'm currently using a 10A EMC-2000 charger(2 1/2 years ol...
by JoeG
Mar 02 2012 9:44pm
Forum: Items for Sale - New
Topic: Fechter's Mini Meanwell Limiter V.3
Replies: 215
Views: 35351

Re: Fechter's Mini Meanwell Limiter V.3

Hey Fletcher, I'm thinking of using 3 Meanwell PSP-1000-48 , 19A supplies in series to charge my 162V peak charge voltage EV pack. Do you know if your limiter board has been used sucessfully on the larger Meanwell supplies? Or this version in particular? Also, I've heard some of the supplies don't d...
by JoeG
Jul 21 2009 12:50pm
Forum: Battery Technology
Topic: bench supply charging 48vX10a "headway"
Replies: 7
Views: 921

Re: bench supply charging 48vX10a "headway"

Hey Joe, I also have a 16s Headway pack, mine is a 20ah. I'm using their supplied BMS & charger at this time. The charger I was supplied was a 6A 240V model. The charger starts at 55V and increases to 58V then the current starts to ramp down and does the same pulsing action. It goes from about 4A to...