Thanks Cor for the feedback. I had not considered the need to limit the current beyond the internal overcurrent protection. I will have to look into that further as well. That might actually be enough to swing me in a different direction. I have been very happy with a 6 amp charging solution for my motorcycle from a Chinese lithium charger. I have verified with the manufacturer that I can get the same charger with the cutoff voltage I want, but decided to also try out the Meanwell. The price for both solutions is comparable but the 10 amp charging vs 6 amp seemed like a significant advantage for the Meanwell route, but maybe not as significant if I need to dial that back... damon
> Date: Thu, 8 Sep 2016 09:04:19 -0700 > To: [email protected] > Subject: Re: [EVDL] Prepping power supply as onboard charger > From: [email protected] > > Definitely put it in a dry place and if you can mount it with some shock > absorbing then that might be beneficial, but the frame of a vehicle > typical does not move fast enough to put a lot of stress on electronics, > it is more the vibrations and an EV has a lot less of those. > Note that Meanwell supplies are typically spec'ed to work off AC and DC > power and we have used them in large numbers in test setups for 48V > power, but those do not get powered off very often, so I cannot speak > about how it holds up with daily power cycling. > Another thing is the current limit that is required for a charger: the > Meanwells have a built-in overcurrent protection, which means that you > will be running the supply at 110 - 120% output all the time. They > typically also have an overtemp protection, but make sure that you are > not giving them a short unhappy life by constant pushing them to the > edge of their operational environment. > It is relatively simple to add a small circuit to measure current and > affect the 2.5V voltage reference to throttle back the supply at a lower > current than its overcurrent protection limit. > Hope this gives some ideas, > > Cor van de Water > Chief Scientist > Proxim Wireless > > office +1 408 383 7626 Skype: cor_van_de_water > XoIP +31 87 784 1130 private: cvandewater.info > > http://www.proxim.com > > This email message (including any attachments) contains confidential and > proprietary information of Proxim Wireless Corporation. If you received > this message in error, please delete it and notify the sender. Any > unauthorized use, disclosure, distribution, or copying of any part of > this message is prohibited. > > > -----Original Message----- > From: EV [mailto:[email protected]] On Behalf Of damon henry via > EV > Sent: Thursday, September 08, 2016 8:40 AM > To: EV List > Subject: [EVDL] Prepping power supply as onboard charger > > I am looking to upgrade my truck to lithium and I'm investigating > charging options. I decided to test out a Meanwell SP-480-48. I found > a brand new one on Ebay for $90. According to the spec sheet > (http://www.meanwell.com/webapp/product/search.aspx?prod=sp-480) they > are adjustable from 41 - 56V. This fits within the range I use on my > 48V motorcyle where I currently charge to 54.6 volts, as well as half my > proposed 96 volt pack for my truck which I think I will want to charge > to 49.8 volts. The thought is to set the voltage where I want the pack > to end up and just let it charge. I will test this on my bench to make > sure I'm happy with the results. > If I am happy with the results, I am then concerned with two items if I > want to make an onboard charger for my truck out of two of these. > First, is inrush current. It does not appear these are built to be > constantly reconnected to Line voltage as the spec sheet indicates they > have a typical inrush current of 20 amps on 115v AC. So I would need to > design a simple inrush limiter, automated would be preferred, although a > simple switch with a resistor wired across it is not out of the > question. Any suggestions on simple automated inrush circuits? My > second concern is that I doubt these are meant to travel. If I were to > crack it open and take a look at the guts, what would be typical things > to look for in order to ruggedize this for a mobile life. Would it be > easier to be sure that it is mounted in a dry ventilated space with some > kind of rubber mounting or to actually try to protect the components on > the board itself. > Damon > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20160908/fee2 > 7480/attachment.htm> > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Read EVAngel's EV News at http://evdl.org/evln/ > Please discuss EV drag racing at NEDRA > (http://groups.yahoo.com/group/NEDRA) > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Read EVAngel's EV News at http://evdl.org/evln/ > Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20160908/981499df/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
