Hi,

I have 2 Sunsynk batteries that were installed around 2 years ago and I just bought a 3rd one from Voltex on special. I've seen people mentioning that I might need to upgrade the firmware on the older batteries to make it play nice with the new master battery. I know this is a long shot but does anyone know where I can get the updated firmware? I'm not super keen to speak to my original installer

https://www.jendustries.co.za/sun-batt-lv

11 minutes ago, slipx said:

https://www.jendustries.co.za/sun-batt-lv

Thanks so much

Pleasure. Out of interest do you know when that sunsynk battery was manufactured that you bought from Voltex . I heard they were trying to clear old stock.

26 minutes ago, slipx said:

Pleasure. Out of interest do you know when that sunsynk battery was manufactured that you bought from Voltex . I heard they were trying to clear old stock.

Still waiting for it to be delivered but will let you know when it arrives.

7 hours ago, slipx said:

Pleasure. Out of interest do you know when that sunsynk battery was manufactured that you bought from Voltex . I heard they were trying to clear old stock.

Thanks for this.

I am off to get 2 at half price of what I originally paid 2 years ago.

Sunsynk Wall Battery 5.32kWh (R16 100.00)😀

@Virwat , remember, these are the push connectors, there is a major supply issue out there

@Tariq Please elaborate on the issue, as I already have 2 of these batteries with no hassles so far.

1 hour ago, Tariq said:

@Virwat , remember, these are the push connectors, there is a major supply issue out there

I bought pre-made cables from Solar Shop.

Edited July 24, 2025Jul 24 by Gambit

1 hour ago, Virwat said:

@Tariq Please elaborate on the issue, as I already have 2 of these batteries with no hassles so far.

You will need to buy the cables separately as they don't come with the battery. You will also need the RJ45 for battery comms

Off topic, but I am also looking at the same batteries

When 2 connected to a 8 kW Sunsynk inverter, I see that the automatic Inverter BMS data shows

Charge current limit 100 A

Discharge current limit 100A

Does it allow you to change your discharge limit to make use of the full 8 kW of the inverter?

These batteries are rated 0.5 C

But Data Sheet says max charge and discharge 100 A per battery and peak (2 minutes) 150 A

Just wanting to know anyone with experience with Sunsynk batteries

I normally use Hubble AM 5 or Pylons

Warranty is the same on the Hubble with unlimited cycles

But Sunsynk batteries change inverter warranty from 5 years with other makes of batteries to ten years if you use Sunsynk batteries

52 minutes ago, James 1 said:

Off topic, but I am also looking at the same batteries

When 2 connected to a 8 kW Sunsynk inverter, I see that the automatic Inverter BMS data shows

Charge current limit 100 A

Discharge current limit 100A

Does it allow you to change your discharge limit to make use of the full 8 kW of the inverter?

These batteries are rated 0.5 C

But Data Sheet says max charge and discharge 100 A per battery and peak (2 minutes) 150 A

Just wanting to know anyone with experience with Sunsynk batteries

I normally use Hubble AM 5 or Pylons

Warranty is the same on the Hubble with unlimited cycles

But Sunsynk batteries change inverter warranty from 5 years with other makes of batteries to ten years if you use Sunsynk batteries

AFAIK the Sunsynk batteries 5.32 batteries are rated 1C. I am also running an 8KW Sunsynk inverter with 2 x 5.32 KW Sunsynk batteries and the LiBMS menu shows 200A current limit which I think it gets from the battery BMS. 100A per battery

Definitely 0.5 C recommend

So definitely can't be called a true 1C

Thanks for the reply

I also recently bought one from Voltex. Mine was manufactured in 2023. I was skeptical about the charge left in the battery once I noted the manufacture date. Voltex salesman told me they sold lots of these with no returns so far. I have another 2 I bought. 1 in Aug and 1 in Nov 2024 from Harolds. This is my 3rd battery then. Powering up the battery the SOC was roughly 48%. I was happy that it still had a decent amount of charge so connected it to my system as a slave. I assumed the other 2 bought from Harolds will be newer so one of them should be master.

I have been running it for a week now and seems ok.......but different. Inverter (Deye 5Kw) Still says 200 amp charge and discharge. I assume it is not picking up the BMS of the 3rd Voltex battery.

Is there a way I can check and verify manufacturing date of the other 2 Harolds batteries? (They were bought 3 months apart)

I just want to make sure they are the newer ones and that I don't have it the other way around.

The Voltex battery is showing lower or higher SOC than the other 2. I charge it to 100% so the SOC should be calibrated. I assume there are no comms to that battery and that led me to this forum.

(Hi Im new here 1st post!)

Evening. When I try do the firmware update when I open pbms tools it recognizes the usb( com3). However when I click connect it pops up with an error no serial port available.

Afternoon All.

So I got 4 of the eenovance batteries. But when I plug in the cable for a firmware update it gives me an error message that there is no serial port available. It does not update the info on the pbmstools application.

Anyone have experience with this? Am I forgetting something?

On 2025/07/23 at 11:07 PM, slipx said:

Pleasure. Out of interest do you know when that sunsynk battery was manufactured that you bought from Voltex . I heard they were trying to clear old stock.

@slipx The battery was delivered today. Looks like it was manufactured 1 March 2023. So old stock :(

4 hours ago, Gambit said:

@slipx The battery was delivered today. Looks like it was manufactured 1 March 2023. So old stock :(

Hopefully it was stored correctly. You should probably try charge it ASAP. I wonder what the SOC and SOH will be?

34 minutes ago, slipx said:

Hopefully it was stored correctly. You should probably try charge it ASAP. I wonder what the SOC and SOH will be?

I am a little worried, it is a long time since it has been charged. Going to install it on Friday. Hopefully it is fine and I don't have to send it back.

A quick start-up of the 2 batteries I just bought when I took it out of the packaging shows SOC 4 led on.

So that can be anything between 67% and 83% SOC. 😃

Date of Manufacture 04/23.

1 hour ago, Virwat said:

A quick start-up of the 2 batteries I just bought when I took it out of the packaging shows SOC 4 led on.

So that can be anything between 67% and 83% SOC. 😃

Date of Manufacture 04/23.

Thanks @Virwat . That is good news, I hope the one I bought also has a similar SOC when I start it up.

Always a good idea when adding a battery to a long existing battery to set old be batteries to 100% charge for a few hours at least to let them fully balance

Then disconnect and do the same with the new battery

Then connect them all together

All should now be balanced and at 100%

1 hour ago, James 1 said:

Always a good idea when adding a battery to a long existing battery to set old be batteries to 100% charge for a few hours at least to let them fully balance

Then disconnect and do the same with the new battery

Then connect them all together

All should now be balanced and at 100%

Thanks for the advice. This was something I was thinking about doing, especially with a battery that hasn't been charged in such a long time. Was also thinking of dropping the charge amps down to 10amps to not stress it out.

So, I too have recently got 2 new Eenovance batteries to complement the existing two sunsynk batteries. This is the whole "rebranded" story so Sunsynk are unable to update the firmware via the inverter.

I have tried absolutely everything, starting with the basics here (https://www.jendustries.co.za/sun-batt-lv) but no matter what I am unable to get the BMS tools to detect either battery (nor the new ones).

My setup:

8kw inverter, 4 batteries in parallel. CAN connected from inverter to eenovance battery 1. Out port connected to in of second eenovance, out port connected to in of 3rd battery, sunsynk, then finally the same to the last battery.

Inverter correctly identifies all batteries (BMS values change after turning on each battery) so im happy that thats are all talking to each other correctly.

Now for the firmware, this is the general procedure I am following:
- Power down and disconnect all batteries
- Unplug all cables from batteries
- Plug single RJ45 plug into the RS232 port (Pin 1 GND, Pin 2 TX (RX wire on the USB device), Pin 3 RX (TX wire on the USB device))
- Connect the USB to the computer, its correctly picked up in Device Manager, I have tried different drivers.
- Turn on the red switch on the battery
- Press and hold the front button for a few seconds, wait for the battery to boot.
- Open oldest version of BMS Tools (tried all 3)
- USBs' COM port exists.
- Click Open or Try Connect. Times out or fails to open serial port

I have repeated this about a thousand times. All 4 batteries behave the same.

I have my own crimper, and have reprimed many times. I have tried swapping the TX and RX pins. I have tried pins 6,7,8. I have 4 USB devices. 1x 3.3v, 1x5v, (both these are good quality ones from Communica) 1x cheap one and a very old one that has a DB9 connector that I have wired into a RJ45 plug. I have setup a ESP32 device and using the ESP devices can successfully TX and RX data from the USB cable to the ESP so I know the devices are working.

I'm really at a loss as to what I'm doing wrong. I feel like I'm encountering a self made issue as the general consensus online is that it just works.
Any pointers would be great.

1 hour ago, MarkRudling said:

So, I too have recently got 2 new Eenovance batteries to complement the existing two sunsynk batteries. This is the whole "rebranded" story so Sunsynk are unable to update the firmware via the inverter.

I have tried absolutely everything, starting with the basics here (https://www.jendustries.co.za/sun-batt-lv) but no matter what I am unable to get the BMS tools to detect either battery (nor the new ones).

My setup:

8kw inverter, 4 batteries in parallel. CAN connected from inverter to eenovance battery 1. Out port connected to in of second eenovance, out port connected to in of 3rd battery, sunsynk, then finally the same to the last battery.

Inverter correctly identifies all batteries (BMS values change after turning on each battery) so im happy that thats are all talking to each other correctly.

Now for the firmware, this is the general procedure I am following:
- Power down and disconnect all batteries
- Unplug all cables from batteries
- Plug single RJ45 plug into the RS232 port (Pin 1 GND, Pin 2 TX (RX wire on the USB device), Pin 3 RX (TX wire on the USB device))
- Connect the USB to the computer, its correctly picked up in Device Manager, I have tried different drivers.
- Turn on the red switch on the battery
- Press and hold the front button for a few seconds, wait for the battery to boot.
- Open oldest version of BMS Tools (tried all 3)
- USBs' COM port exists.
- Click Open or Try Connect. Times out or fails to open serial port

I have repeated this about a thousand times. All 4 batteries behave the same.

I have my own crimper, and have reprimed many times. I have tried swapping the TX and RX pins. I have tried pins 6,7,8. I have 4 USB devices. 1x 3.3v, 1x5v, (both these are good quality ones from Communica) 1x cheap one and a very old one that has a DB9 connector that I have wired into a RJ45 plug. I have setup a ESP32 device and using the ESP devices can successfully TX and RX data from the USB cable to the ESP so I know the devices are working.

I'm really at a loss as to what I'm doing wrong. I feel like I'm encountering a self made issue as the general consensus online is that it just works.
Any pointers would be great.

Hi @MarkRudling

I was also having issues with an old usb to rs232 cable I had lying around. It was a bit pricey, but I bought this cable https://solar-assistant.io/shop/products/rs232_self and crimped the RJ45 on and it worked first time on all 3 of my Sunsynk batteries.