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hello everyone, I'm looking to expand my 24v 2p eve lf280-k battery. I saw that gobelpower has rept 280ah cells ess grade with scratched qr for only $71/each shipping excluded. sounds like a good deal for solar storage. anyone tested these? general reviews of gobelpower seem favorable. cheers...

I see. I am using home assistant as well, my jks are read from an esp using sysi's code. As I was also suspecting the ha integration being at fault I removed the switches to turn the bms's charging on and off. Didn't help. I also suspected the Bluetooth connection could lead to reboots but my...

Hi there, It seemed like it was constantly rebooting. So a reboot loop. Do you have similar issues with yours?

Situation is resolved. If anyone experiences similar issues, redo the top balance. It seems like the faulty BMS introduced the issues. It restarted up to 300 times per day. When I installed the replacement BMS I thought the battery was still top balanced. After top balancing again the two...

Yes, i redid all the connections and checked the torque. Also, the voltages reported by the BMS are on point, triple checked with voltmeter. The batteries had plenty time to balance the last weeks. Roughly every second day the batteries are full and absorb. That led to battery bank #2 staying...

Hey there, I noticed a strange behavior in one of my 8s battery bank. When the bank reaches the upper knee, two cells (#5 & #6, red and yellow in the attached graph) shoot up faster than the others. When the system reaches absorbtion voltage (15min at 27.6v) they fall behind the others. The...

Hello everyone, I am seeing similar issues with my b2a8s20p (hw version 9) BMS. Whenever the temperature goes below 5°C (41°F) the BMS misbehaves. It goes into panic Mode, that means dot dot dash and repeat. I checked all the connections and double triple quadruple checked the balance connector...

Sorry to hear. I've never tested my cells individually but the whole pack (top balanced) never delivered more than roughly 267ah. So more or less the same as your low cell. They're behaving nicely though, delta is consistently below 10mv and no runners on the top. So I would have been happy with...

Right, this seems to be exactly my usecase. I will try this approach. Thanks!

Always checking with a quality multimeter of course. In the old lead acid times (just a few weeks ago ;-) the second SCC would yield 2.5 kWh on an average day. Since switching to lithium, I've only seen numbers close to that when the battery started on a low soc of course and when I set the...

So you mean I should leave the 2nd controller in float even though it won't charge while the voltage is higher than the set float voltage? I mean it could be enough to keep the batteries full in summer. But what about winter? Would it be acceptable to let the cells float at 3.4v? In that case...

Well, as long as my cells are in between the knees (roughly between 3.1 - 3.4v) the highest I've seen was a delta of 10mv. Most of the time less than 5. So the top balanced worked fine I would say. Docan offered me a warranty extension and I took it. I'm pretty sure that the shipping costs for a...

Thanks, I had a similar impression but as a newbie in this forum I didn't want to call BS regarding other users. Like I said, the whole buying process was flawless and professional so I don't have any quarrel with Docan. And they seem motivated to straighten things out. However, another...

I just finished the 2nd capacity test. Wasn't sure the first time if I got it right but the results were consistent: - Top balanced to 3.6v - during discharge the cells stay in between 20mv so well balanced I'd say (BMS balancing disabled for the test) - discharge until 2.5v disconnect from BMS...

Still unable to find a good source for class t fuses. However, I read in a German diy solar forum that a lot of people over there use NH type fuses. AIC 120kA. Are those also suitable or are they all on the wrong track? Example: https://datasheet.eaton.com/datasheet.php?model=200NHG1B&locale=en_GB

Well you lost me there. I wasn't going to ground the chassis of the battery (will be a standard plywood box anyway). The raceway will be max 3 feet. And different sources say #2 gauge will be good up to 180A. E.g. https://www.powerstream.com/Wire_Size.htm Could you clarify why you think #2 won't...

You're absolutely right. Haven't thought about losses. I read somewhere that anl fuses are recommended for lifepo4. After some more digging this seems to be absolutely wrong. Now I am trying to source a class t 200A fuse in Spain. Someone having a good seller in EU?

Found some #10 wire that should be sufficient. Just need to get some terminal connectors. That brought me to another idea, I've got some #2 wire (35mm2) lying around. If I get some terminal connectors couldn't I use it as interconnectors instead of the stiff busbars? At first glance it should be...

Thanks, going to look for some smaller gauge cable, if I can't find it the 35mm2 will have to do.

One more question: Since I will build the battery in series (to avoid removing them after top balancing) I'm looking for a solution to connect them in parallel. I have some #2 gauge (35mm2) cable lying around. Thought about buying some sc35-6 terminal connectors and crimping myself some...

Hi Joanna, Thanks for the advice. I wanted to start testing but didn't want to build the box and compression before clarifying whether this level of bulging is normal or an indication of something being off. I guess the answer to my case is that it's still acceptable. Not interested in lengthy...

Not really, temps on delivery day didn't exceed 33°C so probably not an issue. What do you think about discharging to roughly 30% before fixating?

Hello everyone, I just received 8x EVE lf280k from Docan Power. The buying process was pleasant and professional. Had contact with Amy Zheng and Beki and both were really helpful and answered all my questions. Shipping was 6 weeks. Opened up the packages today and all cells seem to be in good...

Hello Michael, Thanks for your reply. Your calculations are spot on. In practice I see the currents you calculated. I also came to the conclusion that the battery is oversized. However, that doesn't seem to be the problem. I tried supplementing with a diesel generator and the battery still...

Hello everyone, I've been reading this forum for some weeks now and I'm amazed how much knowledge is floating around. Also, the community seems to be very beginner friendly so kudos to all of you. I recently bought a house (off grid) with a solar system. I did some research beforehand and...