Good morning.
Can I add another battery to my energy storage system myself? I have three Simpo 5000 ZYC batteries and I want to add another one. Can I do this myself? If so, please advise how.
Thank you.
Its going to depend on (if you have the right tools) how familiar you are with the necessary tools and electrical safety.
A bit, but maybe someone here can help and explain exactly what’s going on. I already have three of these batteries in a set and I want to add another one.
Thank you very much for your reply and help. Karol
Do they come with battery links?
A manual?
@Karol The units appear to use amphenol connectors so much like the Pylontech’s and other usually will require the newest battery to be the master. No documentation at all from what I can see so best to check with them directly also as to which size connector before you order and don’t stack them without adequate support between them and ventilation.
1 Like
Just as a sidenote, you should put one of the common connections (either positive or negative) on the opposite end of the stack. So that every battery module has the same total amount of cabling and connectors. If its wired like you did, then the top battery will always charge and discharge less compared to the bottom one that has both common connections.
If you add a fourth take the opportunity to rewire that
1 Like
And… the new batterie must be charged to the same SOC level as the stack before you add the new one.
And… a stack with FOUR batteries in parallel is not common. Better would be TWO batteries in parallel and the left top and right bottom connector to a busbar. FOUR equal busbar cables (2x +, 2x -) are needed.
This is that was @chrigu has written.
1 Like
This is how the service center connected the batteries. They balance the batteries a few times a month and everything seems to be fine.
That may be good, and it’s nice that everything works as desired. 
Nevertheless, due to the wiring, the individual batteries see different voltages, albeit only slightly, but when balancing, we are within the same voltage range: milliVolts
Everything is fine, but you need to follow the step-by-step procedure to add an additional battery.
1 Like
It is not correct for current sharing. (And balancing)
The suggestion comes from experience based learning and of course good electrical set up.
Taking either the negative or the positive to the battery on the other end of the bank will improve everything there.
There are some good visuals here as to why.
Procedure. There maybbe steps to add here if your battery manual asks for that.
-
Make sure your battery bank is at the same level as the one you want to add. Soc if possible but if they are at the same voltage then it’s also ok.
As a side note it is easier the first if they are all fully charged then there is no guessing. -
Bypass the system if you have one. Shut everything down (AC off in and out, solar off, batteries all off)
-
Check with a digital meter that there is no voltage anywhere
-
Physically place the battery and connect it up with the wiring as described. Taking off from either end. Even better if you can add the extra pair of wires so you have pairs. (If not don’t stress right now - plan it in the future)
-
Power on your stack - you may still get some current movement between batteries depending on how close they are matched.
-
Switch on your solar
-
Switch your inverter on to inverter only make sure it works
-
Power on your ac in and out again
-
Remove the bypass.
Check everything is reading and doing. What it should be doing.
1 Like
Thank you for the tips
Today I was browsing the internet and the connections are shown as you mentioned, but also similar to mine. I saw videos at the ZYC trade show where the TSK was also connected, just like mine. Yesterday, I spent a long time looking at the LEDs that indicate battery charge, and it was clear that charging was stable across all the batteries. I didn’t notice the top one having less charge. This is the only way I can check, and I understand it may not be reliable, but that’s how I see it.