Amund, You may consider heaters for the low temp ambients and if necessary coolers for the high.
You might also consider operationally limiting your charge cycles to only times when the ambient is within acceptable limits and make this a part of your certification by placing it in the conditions of use. I have seen this scenario before in solar systems located in very cold climates. In that case it was fortunate that the daytime temperatures warmed things up when the sunlight was available. All the best, -Doug Douglas E Powell Laporte, Colorado USA [email protected] http://www.linkedin.com/in/dougp01 On Tue, Apr 17, 2018 at 11:12 AM, Nyffenegger, Dave < [email protected]> wrote: > If power is available to charge the battery then the product could also > employ a battery strip heater thermostatically controlled to bring the temp > up to minimum. > > I have a low voltage low power strip heater on the battery in my listed > outdoor gate opener controller. It happens to be a sealed lead acid > battery but something similar should work for Li. The heater sits flush on > the entire side of the battery, a few mm thick. > > -Dave > > -----Original Message----- > From: Brian O'Connell [mailto:[email protected]] > Sent: Tuesday, April 17, 2018 12:54 PM > To: [email protected] > Subject: Re: [PSES] EN50131-1 Battery spec vs. Environmental class > > Depends on Security Grade requirements and where the battery is stored. > > Li batteries can be used in discharge mode to -20C. Have only done one > project for this, where the battery temperature was monitored by the > charger, and shut down charge current when outside rated temperature range, > but allowed discharge to -20C. > > Brian > > > From: Amund Westin [mailto:[email protected]] > Sent: Monday, April 16, 2018 11:42 PM > To: [email protected] > Subject: [PSES] EN50131-1 Battery spec vs. Environmental class > > EN50131-1: Alarm systems - Intrusion and hold-up systems -- Part 1: System > requirements > > From the standard: > Environmental Class II: Indoor General (-10º to +40º) > > > Li-Ion batteries may have this spec: > Charging: 0º C to 45º C > Discharge/standby: -20ºC to +50º C: > > As I understand the Li-Ion tech, the batteries should not be charged when > temperature is below 0º C and that means it's not possible to qualify for > Environmental Class II (-10º to +40º) Indoor General. > Unless you monitor the temperature and prevents charging when temperature > is under 0º C, but that may lead you into other trouble if temperature > remains low over a long period. > Any others who has considered the same case and agree? > > Best regards > Amund > > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. To post a message to the list, send your e-mail to < > [email protected]> > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieee-pses.org/emc-pstc.html > > Attachments are not permitted but the IEEE PSES Online Communities site at > http://product-compliance.oc.ieee.org/ can be used for graphics (in > well-used formats), large files, etc. > > Website: http://www.ieee-pses.org/ > Instructions: http://www.ieee-pses.org/list.html (including how to > unsubscribe) List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Scott Douglas <[email protected]> > Mike Cantwell <[email protected]> > > For policy questions, send mail to: > Jim Bacher: <[email protected]> > David Heald: <[email protected]> > > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. To post a message to the list, send your e-mail to < > [email protected]> > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieee-pses.org/emc-pstc.html > > Attachments are not permitted but the IEEE PSES Online Communities site at > http://product-compliance.oc.ieee.org/ can be used for graphics (in > well-used formats), large files, etc. > > Website: http://www.ieee-pses.org/ > Instructions: http://www.ieee-pses.org/list.html (including how to > unsubscribe) > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Scott Douglas <[email protected]> > Mike Cantwell <[email protected]> > > For policy questions, send mail to: > Jim Bacher: <[email protected]> > David Heald: <[email protected]> > -- Douglas E Powell [email protected] http://www.linkedin.com/in/dougp01 - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
