tag:blogger.com,1999:blog-3102963615850212294.post7120551940161482257..comments2023-09-26T10:40:01.875+01:00Comments on Solar Power - A Bodger's Guide: Flakey CellLog8s alarmOuttasighthttp://www.blogger.com/profile/02048189191321429295noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-3102963615850212294.post-38472926448534180372012-02-22T17:56:21.686+00:002012-02-22T17:56:21.686+00:00Sounds interesting about your scooter.
I'm ma...Sounds interesting about your scooter.<br /><br />I'm making some progress with the CellLog8s. Junsi has been a star and turned around a beta firmware for me in just one day!<br /><br />Testing it now and it seems to have partially fixed the problem. Stay tuned for another main blog post on the details...Outtasighthttps://www.blogger.com/profile/02048189191321429295noreply@blogger.comtag:blogger.com,1999:blog-3102963615850212294.post-36704051060605431132012-02-22T16:01:00.068+00:002012-02-22T16:01:00.068+00:00Thanks for the links you've posted. I have bee...Thanks for the links you've posted. I have been looking on things like that before. However I do not want to spend more money on the lead acid bank. I'm going to build a very simple balancing circuit like this: http://www.evdl.org/pages/hartregs.html<br />I'm still going to use cell-log but their job will be to light up a big red lamp in my eyes when it's time to charge. The blinking would still tell me what it is about, even if the light should be constant.<br /><br />Maybe I should tell that my battery bank is powering an electric scooter with a peak draw at 4kW. or ≈80A<br />It's built up with four 60Ah batteries (Greensaver) which have a low peukert constant (for being leads)<br /><br />At the 2H dischargerate they should deliver 43,2Ah.<br />Under the winter I have measured them up and it's only one battery that performs like it should according to the spec. The rest gives from 25 to 30Ah.<br /><br />Lithium would be fantastic, but I can't really says that I must buy it now. The scooters range is still enough for me.<br /><br />I'm following your blog and the thread on RCG and it will be interesting to see how things works out.Mattias Carlssonnoreply@blogger.comtag:blogger.com,1999:blog-3102963615850212294.post-29828974327121861102012-02-17T00:43:15.989+00:002012-02-17T00:43:15.989+00:00Thanks for your feedback, Mattias.
I'm glad...Thanks for your feedback, Mattias. <br /><br />I'm glad in one way that it's not just me having the problem. But I'm also now worried that it's a real software problem with the CellLog, or worse, a fatal hardware design error and it will never work properly.<br /><br />If the CellLogs don't work out for you, you could always try out the 12V monobloc balancers that I'm using on my 24V bank. You can use two of them across the two pairs of your 48V bank and it will keep all of them in balance. Each one can shunt 1A, so a bit more powerful than your 5W lamps.<br /><br />See here:<br />http://solarbodge.blogspot.com/2011/01/active-battery-balancing.htmlOuttasighthttps://www.blogger.com/profile/02048189191321429295noreply@blogger.comtag:blogger.com,1999:blog-3102963615850212294.post-32547274426029232912012-02-16T13:58:02.302+00:002012-02-16T13:58:02.302+00:00Hello!
I seem to have the same problem as you hav...Hello!<br /><br />I seem to have the same problem as you have.<br /><br />In my case I am using four cellLog 8m to monitor the voltage of four 12 volt batteries in series. I have them hocked up with one relay each and they switch a lightbulb on if the voltage goes below 10,5V or over 14,9V.<br /><br />For the low voltage it just works like a indicator but for the higher voltage it also works like a balancer when charging. A small bulb at 5W seems to hold down the voltage enough to let all batteries hit fully charged when charging in series.<br /><br />However the alarm switch on and of even if the voltage is in the alarm range. Just like it does in your videos. I hope that this can confirm to you that the problem appears even if the device is not powered from usb.<br /><br />Unfortunately the 8m model doesn't have a usb-port, so firmware update is not possible. :(<br /><br />I hope that Junsi comes up with a solution for the 8s model. (I have some of those too)<br /><br />Best regards Mattias from SwedenMattias Carlssonnoreply@blogger.com