Mars

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.

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.

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.

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.

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

Must is not good.  At least not for Axpert series. 
If you will see ( hope you will not ) the low quality copy makers , you will understand why i called Must best replica.

Chris , Voltronic Taiwan origin but Both Made in China. More in detail both in Guangdong , both in Shenzhen , even both factory in the same street .
Voltronic is the original producer of Infini series following to Axpert series , Must was a big factory focused on transformer EP series.
Then Must copied Axpert series. There are very low quality copy makers but we learned that Must is the best quality replica so far.

Chris , Voltronic Taiwan origin but Both Made in China. More in detail both in Guangdong , both in Shenzhen , even both factory in the same street .
Voltronic is the original producer of Infini series following to Axpert series , Must was a big factory focused on transformer EP series.
Then Must copied Axpert series. There are very low quality copy makers but we learned that Must is the best quality replica so far.