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  1. #1
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    Question for anyone who has the celllog 8s monitor

    Is the alarm very loud? I'm planning on buying 2 of them and probably putting them right below my seat.

    Talking about this monitor

  2. #2
    Senior Member nwmtnbkr's Avatar
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    Quote Originally Posted by morph999 View Post
    Is the alarm very loud? I'm planning on buying 2 of them and probably putting them right below my seat.

    Talking about this monitor
    Morph,

    I have the original CellLog 8S, which logs. I have no problems hearing the alarm in my house when charging (I have yet to discharge the cells low enough to trigger the LV alarm). The good news is that the CellLog comes with a wire that you can wire to a piezo buzzer and then plug into the unit to amplify the sound of the alarm. (Piezo buzzers are small and inexpensive and if you have a Radio Shack nearby, you can probably pick one up there.) If you have e-brakes, you can also wire the CellLog to perform LVC and not have to rely on the audible alarm. I love the CellLog--it's very versatile. One mod you will need to make to ensure that you don't get cells 7 and 8 out of syn is to solder a small copper wire on the board (the company is aware that with larger packs all power for the CellLog is drawn from cells 7 and 8 but they don't seem inclined to remedy this situation because the soldering fix for larger packs makes the unit not function with 2-cell packs). The copper wire that is soldered to fix the issue is circled in green. All kudos for this fix goes to SpeedEBikes over at Endless Sphere.


  3. #3
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    Everyone who bought Thundersky batteries, make sure you check your battery cells voltage each time you charge them. I had a weak cell and for some reason, it didn't charge all the way with the rest of the batteries. It's still a good cell but for some reason it didn't charge. It's charging right now. It's at about 3.45v now.

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    nwmtnbkr ,

    Can you tell me everything you bought for your celllog monitor and where you bought it, including the piezo alarm? How hard was it to install the piezo alarm? I don't have a soldering iron. Did you need any wires to connect to the cells or did wires come with it? Thanks.

  5. #5
    Senior Member CowtownPeddler's Avatar
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    My next project is the helmet with the sound system and cam, so an audible alarm had better be loud. I like this... Actually, the next is a wireless USB hub and a netbook. This sounds easy tho....

    A buzzer in the helmet, hmmmm

  6. #6
    Senior Member nwmtnbkr's Avatar
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    Quote Originally Posted by morph999 View Post
    nwmtnbkr ,

    Can you tell me everything you bought for your celllog monitor and where you bought it, including the piezo alarm? How hard was it to install the piezo alarm? I don't have a soldering iron. Did you need any wires to connect to the cells or did wires come with it? Thanks.
    Sorry to be responding so long after you posted the question, morph. I didn't see it until CowTowPeddler bumped the thread with his post. I bought my CellLog 8 from EPBuddy in the US. It was actually cheaper than ordering from Hobby King, once I added the postage charge from Hong Kong. Plus, I got my unit from EP Buddy in about 4 days. The original CellLog 8 that is capable of logging comes with a mini-USB cable so you can hook the CellLog 8 to your computer to download data about the cells of your battery under load, a pair of mini-alligator clips so you can measure the voltage of individual cells and a CD with LogView software and the CellLog manual. You have to buy the cable to connect the 8 cells. I ended up ordering a cable harness off e-bay for $13, with free shipping. It's gone up by a $1.50 and is now $14.50, but shipping is still free. http://cgi.ebay.com/Chargery-Power-D...item3ef9488a10 It is very well made and if you have an iCharger 208 or 110, you can use the banana plugs to connect to the charger. I cut off the banana plugs and wired an XLR chasis connector to be able to use my 3-stage, 24V smart charger.

    I'm extremely happy with my CellLog. Not only does provide the functionality of a BMS, I can look at data of the cells under load in a variety of formats to determine the health of my battery pack. It's worth every penny.

  7. #7
    Senior Member nwmtnbkr's Avatar
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    Oh, and I forgot to mention that I haven't installed a piezo alarm yet. My alarm sounded once while I was climbing a steep, unimproved forest road and I heard it clearly. However, you ride in an urban environment so a piezo alarm might be needed. (I forgot to mention that an alarm wire is included with the CellLog unit.) I have my CellLog in a metal case that is attached to the case I built for my batteries. I intentionally used a case for the CellLog that is large enough to house a 1-inch piezo as well.

    385308747..jpg

  8. #8
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    Quote Originally Posted by nwmtnbkr View Post
    Sorry to be responding so long after you posted the question, morph. I didn't see it until CowTowPeddler bumped the thread with his post. I bought my CellLog 8 from EPBuddy in the US. It was actually cheaper than ordering from Hobby King, once I added the postage charge from Hong Kong. Plus, I got my unit from EP Buddy in about 4 days. The original CellLog 8 that is capable of logging comes with a mini-USB cable so you can hook the CellLog 8 to your computer to download data about the cells of your battery under load, a pair of mini-alligator clips so you can measure the voltage of individual cells and a CD with LogView software and the CellLog manual. You have to buy the cable to connect the 8 cells. I ended up ordering a cable harness off e-bay for $13, with free shipping. It's gone up by a $1.50 and is now $14.50, but shipping is still free. http://cgi.ebay.com/Chargery-Power-D...item3ef9488a10 It is very well made and if you have an iCharger 208 or 110, you can use the banana plugs to connect to the charger. I cut off the banana plugs and wired an XLR chasis connector to be able to use my 3-stage, 24V smart charger.

    I'm extremely happy with my CellLog. Not only does provide the functionality of a BMS, I can look at data of the cells under load in a variety of formats to determine the health of my battery pack. It's worth every penny.
    I am hoping to mount a pair of the CellLog 8s on my handle bar so I would need really long wires because of this I would prefer to use lighter gauge wiring. I am thinking of something in the 22 gauge so I can run 16 wires without being very noticed. I know you like your cable system but for me I don't think it would work well unless I cut and patch wire into it. D oyou know of anywhere I can buy the connector ends with wire clips so I can make my own?

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    Senior Member nwmtnbkr's Avatar
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    Quote Originally Posted by dumbass View Post
    I am hoping to mount a pair of the CellLog 8s on my handle bar so I would need really long wires because of this I would prefer to use lighter gauge wiring. I am thinking of something in the 22 gauge so I can run 16 wires without being very noticed. I know you like your cable system but for me I don't think it would work well unless I cut and patch wire into it. D oyou know of anywhere I can buy the connector ends with wire clips so I can make my own?
    You need to buy JST-XH 9-pin connectors (be careful not to buy those used by toy train hobbyists--they're too small). You'll also need a special crimping tool for this connector. You can buy the JST 9-pin connectors from digi-key.com. Here's a link for the specific connector you'll want to get. http://search.digikey.com/scripts/DkSearch/dksus.dll?WT.z_header=search_go〈=en&site=us&keywords=455-2217-ND&x=12&y=26

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    Thanks for the info. So they definately require 9 pins? I assume 8 positive and one neutral.

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    Senior Member nwmtnbkr's Avatar
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    Quote Originally Posted by dumbass View Post
    Thanks for the info. So they definately require 9 pins? I assume 8 positive and one neutral.

    Here you go. You'll get this diagram in the owner's manual too, which is on a CD included with the CellLog.



    I have 8 of my cables connected to negative terminals and 1 to a positive terminal. I also have the charging leads on my wiring harness wired to an XLR chasis plug and hook my 24V smart charger to it to charge my battery (with the CellLog 8 connected to sound the alarm once the battery is charged to the proper level).


  12. #12
    Senior Member nwmtnbkr's Avatar
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    I forgot to add that it's important that you get your cables hooked up in sequential order so I'd suggest you number them. The harness I bought has all the cables numbered, which is very helpful when you have nine of them.
    384369359..jpg

  13. #13
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    Quote Originally Posted by nwmtnbkr View Post
    Here you go. You'll get this diagram in the owner's manual too, which is on a CD included with the CellLog.



    I have 8 of my cables connected to negative terminals and 1 to a positive terminal. I also have the charging leads on my wiring harness wired to an XLR chasis plug and hook my 24V smart charger to it to charge my battery (with the CellLog 8 connected to sound the alarm once the battery is charged to the proper level).
    Great info thanks mucho. Are you also still using your old SLA 24v charger from Currie or ??

  14. #14
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    Quote Originally Posted by nwmtnbkr View Post
    I forgot to add that it's important that you get your cables hooked up in sequential order so I'd suggest you number them. The harness I bought has all the cables numbered, which is very helpful when you have nine of them.
    384369359..jpg
    One last question (for now). Your not leaving your cellLog connected 24/7 are you? I am assuming your unpluging it when not riding or charging. Correct?

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    Senior Member nwmtnbkr's Avatar
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    Quote Originally Posted by dumbass View Post
    One last question (for now). Your not leaving your cellLog connected 24/7 are you? I am assuming your unpluging it when not riding or charging. Correct?
    That's correct, I only have it plugged in when I'm riding or charging. I'm very happy with it's performance and don't see the need to have BMS with the CellLog on board. I hope you're getting at least one unit that logs. I think it's invaluable to have the log data showing how each cell performs while under load. When I build my second LIFEPO4 pack, I may get the scaled down CellLog without logging since I have this one that does log.

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    Quote Originally Posted by nwmtnbkr View Post
    That's correct, I only have it plugged in when I'm riding or charging. I'm very happy with it's performance and don't see the need to have BMS with the CellLog on board. I hope you're getting at least one unit that logs. I think it's invaluable to have the log data showing how each cell performs while under load. When I build my second LIFEPO4 pack, I may get the scaled down CellLog without logging since I have this one that does log.
    Yeah, when I get around to it I will likely order 2 of the logging CellLogs. I'm guessing I'll do a few logs in the beginning and not again until (if) I have a problem. What are you using for charging now? It sounds like your mass charging with a 24v charger without a BMS as I do and using the CellLog to check for a hight cell.

  17. #17
    Senior Member nwmtnbkr's Avatar
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    Quote Originally Posted by dumbass View Post
    Yeah, when I get around to it I will likely order 2 of the logging CellLogs. I'm guessing I'll do a few logs in the beginning and not again until (if) I have a problem. What are you using for charging now? It sounds like your mass charging with a 24v charger without a BMS as I do and using the CellLog to check for a hight cell.
    I bought a 3-stage, 24V smart charger that I will also use on my SLA pack periodically. The nice thing about the CellLog is that you can use their default settings for individual cells and overall pack voltage for charging and discharging or create your own custom settings. So far, my cells are staying in close alignment. Since I'm still breaking in my LIFEPO4 pack, I'm logging every ride and saving the data to compare the cells under load in different topologies (everything is hilly here, but some hills are much worse than others). The nice thing about the LIFEPO4 cells is that even though they may sag on a steep hill, they recover. I've not triggered the CellLog alarm again when riding steep hills, but I'm lowering my gears into granny gear range, pedaling more and just gently hitting the throttle when climbing.

  18. #18
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    Quote Originally Posted by nwmtnbkr View Post
    I bought a 3-stage, 24V smart charger that I will also use on my SLA pack periodically. The nice thing about the CellLog is that you can use their default settings for individual cells and overall pack voltage for charging and discharging or create your own custom settings. So far, my cells are staying in close alignment. Since I'm still breaking in my LIFEPO4 pack, I'm logging every ride and saving the data to compare the cells under load in different topologies (everything is hilly here, but some hills are much worse than others). The nice thing about the LIFEPO4 cells is that even though they may sag on a steep hill, they recover. I've not triggered the CellLog alarm again when riding steep hills, but I'm lowering my gears into granny gear range, pedaling more and just gently hitting the throttle when climbing.
    OK, it sounds like you are doing exactly what I do except I don't have the CellLog yet. OPPs, no your not because I am still using my Currie chargers and they are single stage chargers. But I was using my 3 stage BD 12v for a while and ether way it seems to work out OK. I may buy a good 3 stage charger with higher amperage though or a whole bunch of individual cell chargers and use the CellLog plug (without the CL connected) for charging.

    What charger are you using and where did you buy it? And what is the amperage?

  19. #19
    Senior Member nwmtnbkr's Avatar
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    Quote Originally Posted by dumbass View Post
    OK, it sounds like you are doing exactly what I do except I don't have the CellLog yet. OPPs, no your not because I am still using my Currie chargers and they are single stage chargers. But I was using my 3 stage BD 12v for a while and ether way it seems to work out OK. I may buy a good 3 stage charger with higher amperage though or a whole bunch of individual cell chargers and use the CellLog plug (without the CL connected) for charging.

    What charger are you using and where did you buy it? And what is the amperage?
    I bought the 24V 3-stage 2A charger from All Electronics. http://www.allelectronics.com/make-a...CHARGER/1.html
    It's not going to meet your requirement for higher amperage. However, it's such a different beast than the standard Currie charger. It's much larger and better made (higher gauge wire, etc). I'm very happy with it. It's also very affordable at $29.95. I'd also recommend the ready-wired XLR chassis plugs that All Electronics sells. They're very well made. I bought 2 and have one on hand for my second battery build. http://www.allelectronics.com/make-a...K-3-PIN/1.html
    I do need to order a couple of single cell chargers to have on hand if I have some cells start to get out-of-range.

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    I''ll get two of these soon. In the meantime, I'm just going to take it easy on my batteries.

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    Quote Originally Posted by morph999 View Post
    Is the alarm very loud? I'm planning on buying 2 of them and probably putting them right below my seat.
    I was just playing around with mine and I don't think I could hear the alarm over the wind and road noise even if it was by my ear. I just wired the alarm output to my key circuit so it will turn off my batteries if the alarm goes. Programmed the output to nc and wired them in series.

    Btw I set the low cell alarm to 2.5v. Is that a good setting?

  22. #22
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    you could probably set yours for 2.8v since you have such a flat discharge graph. Mine seem to sag to about 2.8v after 4 or 5 AH of usage. 2.5v should be fine, too, though if you want to get maximum capacity out of it. The 3000 cycles that Thundersky claims is for using 80 % of the pack or under.

    Might be interesting to see how far you can get until you hit 2.8v. A guy on endless-sphere said he got about 19 AH out of his. Icecube is his username I think.
    Last edited by morph999; 05-08-10 at 09:22 PM.

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    Maybe I'll go on a long ride and see how far I can get. I've been wanting to ride to the ocean13-14 miles one way.

  24. #24
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    Quote Originally Posted by yopappamon View Post
    Maybe I'll go on a long ride and see how far I can get. I've been wanting to ride to the ocean13-14 miles one way.
    Be prepared to do some peddling on the way back.

  25. #25
    E-Folder Geekybiker's Avatar
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    I just got my celllog in the mail. Thanks for all the info.

    I do have BMS on my battery pack. Does that affect the wiring on the celllog? Does the celllog balance on its own, or is it strictly a monitor?

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