Mars

What accurancy is poor for you ? For example we are selling 67Ah Lifepo4 cells of A123 but we sell as 60Ah to avoid liability. So %10 deviation from 67Ah is ok for us. Dedicated charger tester any example you have ? Because 60Ah can be tested at 30A but can also discharged up to 200A. Cells are brand new , Specifications and Photos are here if you want to see. ( We are mostly selling 60AH. We also have 20AH but very expensive ) You gave me a good idea to use BMS with Shunt like SBMS of Electrodacus. Then the question is if SBMS can give me capacity info for individual cells or only for total 8 cells as well. Any idea about SBMS ? After talking with you I guess i will not test 800 of them. I basicly can not manage it. When we are selling we sell with Guarantee to take back returns and refund. So it is more logical to use people for testing Not only time but when we test we need to open protection tape of Tab. Then people can think them as second hand if tape is open , tabs are damaged etc. So if i can test 80 of them it is enough.

I deal with Voltronic Axpert a lot but never used monitoring ( i even dont have a PC ) But now i have almost 800 big Lifepo4 cells in The Netherlands ( They are 60Ah and on sale by the way ) and i want to test capacity of them before selling. I have the old cheap version Voltronic KS 24V PWM 2.400W only USB A or B port on it If i find a PC and install software ( Watchpower i believe ) can i learn capacity from software after charge or discharge? @Coulomb

Hi Thats true i am a Voltronic distributor & service center. But now i am living in Netherlands i am only selling Lifepo4 cells for Voltronic and Victron here. So all of our Voltronic stock is in Istanbul Turkey and i preffer not to supply parts within Europe. As you are looking the cheapest solution. Cheapest option for you to check with @PeterGutti from Spain. He got a new card from me and he promised to buy me coffee when i go Alicante in summer If he kept his old card maybe he may unsolder this diode from his old card and send to you. Good luck.

Hi @StrikerX i can not see photos. If @Coulomb or @weber or @PeterGutti can see photos maybe they can compare with my old photos. If it is matching i may supply you card.

@Chris Hobson @plonkster @The Terrible Triplett are well known forum writers. i guess they might help or know the ones who can help us/ A forum member Peter from Spain has a broken Communication card. Attached 2 photos. I am a Voltronic distributor in Europe trying to help Peter. Attached PDF is what i have in stock. How we can be sure this will work for Peter ? thank you for your kind help Big KS5 COMM CARD.pdf

You know Testers for 18650 like Opus takes a lot of time and money for end users. ( If you only use for your own project , what you will do with 10 Opus later ? ) Do you have testers ? Can you test and sort 18650 in large amounts ? So maybe you can offer Tested batteries sorted and delivered in South Africa ? Like 2000-2100mah 500 batteries each R5 ... Like 2400-2500mah 500 batteries each R9 I guess not everybody can reach 18650 , so you can deliver those people. Even Lithium Loving Chris Hobson said he could not find good source. At the end of the day you will give 18650 another chance in a powerwall for solar or 12V battery for peoples car or ebike etc etc.

r30 is a lot of money. guess people will be curious of the quantity of batteries?

plonkster ; so by logic those 400VDC inverters which doesnt need boost would be cheaper ? We can connect series of solar panels to supply 400VDC with no extra cost. And if battery supplier just connect cells in series 400VDC will be even cheaper becuase of low current BMS cost. Correct ?

Somehow people in SA can not reach to scrap batteries. In Europe , USA or Australia it is easier. For sure there is not logic to use NCA or NCM 18650 if you can buy LFP of Pylon or even LTO. But the cost of used laptop batteries is extremely cheap. If you can find reliable and logical price BMS lots of people can find those cells in SA as well. Current situation for 300USD DIY powerwall from laptop batteries we need 500USD BMS of Batrium. Then it makes no sense to do it. Pylons are the way to go. But I am still searching ways to do DIY powerwall with old laptop batteries safe and cheap because i found out that in lots of countries it is not still possible to Recycle 18650 , AA , AAA with Lithium , Nicad or NiMH. In stead of recyclying they collect and store in underground safe place for leakage. It hurts me. If we can not recycle it is not sustainable. At least i want to give those 18650`s a second life. Sorry for the emotions in message.

Did you consider Spot Welding ? Some guys was claming soldering is over heating battery. What are your charging voltage , current etc settings ? What BMS’s you are considering ? If you use very low power ( charge discharge ) and very low energy (%40 DOD ) ; is it still dangerous to not use BMS at all ? ( Because you have big but cheap batteries )

Sorry i thought CJW mentioned about FusionHome , which is fro 2kw-8kw , similar to StorEdge without Boost DC converters in Huawei optimizers. For larger ones , have no idea.

Maybe you can post some photos for full pack and close ups ? Are you using inverter for charging ? Axpert ? Can you share settings ?

I was impressed by specs so was following release date since a year. Guess they had some production problems. Huawei always had service problems before. Heard they will start in Australia market first. I am very curious if anybody knows about pricing over there ? Also i thought HV LG fade on SOH quickly due to absence of cooling , so not the best combination.

Hi Peter Hope i can help.I checked , we have attached cards in stock. Send me PM if it works.

Firmwares should be same.Before ordering try to upgrade. So first ask Mecer if you can upgrade your old 5KVA to newcomers firmware.