Yes, I agree, that is annoying, but altering the charge profile of the controller solves the issue.
I'm guessing they do this to extend the cycle coult life of the battery.
13.8 is nearly full anyway.
I found a battery on ebay, free shipping, 100Ah $299... im going to do a load test on it... should i post a video here?
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I'm guessing they do this to extend the cycle coult life of the battery.
13.8 is nearly full anyway.
Ouch! You are only getting 70Ah? I would contact the seller.
All mine tested over 100Ah
How much amp draw are you pulling? How many batteries?
Can you post a link to your thread on the issue?
New Battery on Amazon and Ebay - Global Power 12V100AH LIFEPO4 - $399! Has anybody actually bought one yet? Torn it down yet?
Hey guys, I have been following Will and watching the channel for a while. However I noticed a new battery pop up on Ebay and Amazon. It is a Global Power 12V100AH LIFEPO4. 12.8 V, 100ah Discharge, 200ah Max, 50ah charge at 14.4-14.8v, charge temp 0-45C, discharge temp -20C-65C. Seems like a...
diysolarforum.com
One Battery.
17 amp load (too much?)
Have you retested?
Give him a call he's pretty responsive. ( his phone number is on the data sheet)I have contacted the seller, waiting to hear back.New Battery on Amazon and Ebay - Global Power 12V100AH LIFEPO4 - $399! Has anybody actually bought one yet? Torn it down yet?
Hey guys, I have been following Will and watching the channel for a while. However I noticed a new battery pop up on Ebay and Amazon. It is a Global Power 12V100AH LIFEPO4. 12.8 V, 100ah Discharge, 200ah Max, 50ah charge at 14.4-14.8v, charge temp 0-45C, discharge temp -20C-65C. Seems like a...
One Battery.
17 amp load (too much?)
Have you retested?
I have a new battery on the way. Excellent customer service.
As long as they refund me completely, then I don't really see TOO much harm in that. That sounds like a complete money-back guarantee to me.
well, on testing the first battery, I can confirm balance issues. opened it up and checked the balance leads after it was cutting off at 13.75v. 3.37-3.37-3.37-3.64 I've got the balance leads disconnected from the bms, and hooked to a heltec 5a active balancer. will update
Anyone know what these connectors are called? 5pin 14mm wide. If I'm going to active balance all 30 of these batteries, I need to make it plug and play. I have zero faith in my ability to hand wire it right 30x in a row. At some point swmbo will try to talk to me and I will lose all train of thought.
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Those look like the standard JST XH. I have noticed that some BMS have a variation of them though. Same look but little smaller size.
xh have 2 little spears for retention, these have a squeeze latch. you've put me on the right track though. jst's website has a pic of these exact connectors on the bottom of every page( :frustrated screech:
based on what I'm seeing so far, I think the cells where not balanced before assembly. Basically the normal bms balance is 10-50ma that can only be used effectively during the last 10% of a charge. this is plenty to KEEP healthy cells balanced, however it is not nearly enough to actually balance cells that where not balanced before assembly.
I took several hours last night to balance this pack out with an active balancer that was drawing over an amp (based off my clamp meter) that would literally take hundreds(@.050v) to thousands (@.010v)of hours with a normal bms. I just finished recharging after 1 cycle and the cells stayed very close. I'll do several more shallow cycles 20-50% dod now and see it the cells stay balanced.
All my shunt meters are currently in use on other projects. I have a capacity tester coming monday.
How much disassembly did you have to do to balance these? Based on the Beene video it looks like the negative wire is accessible, just disconnect from the BMS and connect to a power supply or your active balancer?
Its pretty strait forward. Unplug the plug that I posted pics of on the bms and that's all the balance wires. I unplugged the connector and used strait pins to plug my balancer into it. If you want to set up a plug in option the connector is a jst-pa 5pin.
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