I have never used temp compensation. And I have put lotsa batts in un airconditioned and un heated shelters. I think the lack of HVAC kills them much more than temp co charging voltages.
From: Adam Moffett Sent: Tuesday, April 03, 2018 6:56 PM To: [email protected] Subject: Re: [AFMUG] Traco BCMU360 24 or 48v How much is enough to matter? Without temperature compensation you're undercharging all winter and overcharging all summer. My understanding is that's going to permanently reduce your capacity. Even if you have climate control, the battery makes heat when charging and discharging, so if you tape the sensor to the positive terminal you can benefit from temperature compensation even if the room is always 70 degrees. ------ Original Message ------ From: "Mathew Howard" <[email protected]> To: "af" <[email protected]> Sent: 4/3/2018 5:27:27 PM Subject: Re: [AFMUG] Traco BCMU360 24 or 48v I didn't realize the BCMU had temperature controlled charging... that would be an advantage, but if you have it in a box with a power supply, switch and such, it's going to stay pretty warm in the winter anyway... we don't heat or cool any of our boxes, and the majority don't even have ventilation, and I haven't seen any real problems with just using a static float voltage. It may lose us a bit of battery life and/or capacity, but I don't see that it's enough to matter. On Tue, Apr 3, 2018 at 4:10 PM, Darin Steffl <[email protected]> wrote: The one thing that worries me about using the DR-UPS40 is that it doesn't have temperature controlled charging like BCMU does. So we would have to set one charging voltage that is static which will be under voltage in the winter and over voltage cooking the batteries in the summer when the box is hot. We don't heat or cool our boxes so I was looking for something with a little more control of the float voltage with the temperature differences we have. I also would like to only use one battery instead of two. On Tue, Apr 3, 2018 at 4:06 PM, Mathew Howard <[email protected]> wrote: I'm the Netonix would be doing any voltage up/down conversion you'd need to do in that setup anyway, so I don't really see much advantage to 24v vs 48v one way or the other. In a setup like that, I'd personally just use the Meanwell SDR-240-24 with a Meanwell DR-UPS40, and do 24v batteries, instead of using the BCMU-360. You need two batteries instead of one then, but it's cheaper and doesn't have the issues Paul mentioned. I don't have any experience with the Tycon webmonitor, but I definitely can recommend using a SiteMonitor. On Tue, Apr 3, 2018 at 3:52 PM, Paul McCall <[email protected]> wrote: Be aware that the BCMU-360 does the following: Only sustains at 240w Only outputs about 45v when running on batteries. We have started using a step up kit to bring it back to 48v+ Paul From: Af <[email protected]> On Behalf Of Darin Steffl Sent: Tuesday, April 3, 2018 4:50 PM To: [email protected]; [email protected] Subject: [AFMUG] Traco BCMU360 24 or 48v Hey guys, We're looking at fine tuning our DC power solution for sites using more than 75w of power. We're setting in with using the Traco BCMU-360 with a Meanwell SDR-240-24 or 48 volts power supply. If we're using the Traco UPS unit, is there any advantage to using 24v vs 48v power supply? It will only be powering a Netonix DC switch and the BCMU only needs a 12v battery. Also, we're looking at SiteMonitor to monitor the battery voltage and grid power as well. Do you recommend this or the Tycon webmonitor (TPDIN)? Thanks -- Darin Steffl Minnesota WiFi www.mnwifi.com 507-634-WiFi Like us on Facebook -- Darin Steffl Minnesota WiFi www.mnwifi.com 507-634-WiFi Like us on Facebook
