Sunsynk for dummies

[Isetech]

So back to youtube and Sunsynk website to figure it out how to add a battery.

When you add a new battery to a existing system, do you have to charge the battery before you connect or will the lithium battery communicate? I dont have time to wait for a response so it looks like we going to have to wing it again

The system is already up and running, connected , has remote access and doing what it is suppose to do. We had a small change trying to get the inverter to charge the battery, it was a simple setting issue which had to be changed.

Now we are going to add another battery.

Make sure the batteries are switched off, connect the battery cables in the configuration you decide (bussbar or parallel or cascade parallel)

Then plug in the network cable into the can on the master and the inverter, plug the other cable into in on the master and out on the slave.

Switch on the master battery first, then the slave. I am assuming the slave battery will automatically synch with the master and the inverter automatically charge to the level set as per the inverter.

Next will be the battery settings in the inverter, once I have figured it out and it is working I will share the details.

[Isetech]

Something to be aware of, the Sunsynk 5 kwh battery terminals are designed for a 25 mm battery cable, so when you decide to add 5 KWH batteries rather than use a 10 kwh battery which has 50 mm terminals.

The question you need to ask yourself, do you need to fit 125 amp fuses if you decide to use a busbar configuration or do you just connect the wires directly to the busbar and fit the 200 amp fuse at the inverter ? How do you protect the 25 mm cables between the battery and busbar, or use a victron busbar which has space for 5 fuses.

[Isetech]

This is going to be a long thread, there is so much I need to learn about these Sunsynk units. Hopefully one day they will offer Sunsynk specific training in out part of the country.

[Isetech]

By the way if you have what might seem like a "stupid" question and send a pm and hopefully I can answer the question or post in this thread and see if someone can answer the question.

[Isetech]

Anyone figured out what BMS_Err_stop is used for? Why would you tick it under battery setup - battery type ?

[Thys LOW Elektries]

Anyone figured out what BMS_Err_stop is used for? Why would you tick it under battery setup - battery type ?

BMS_Err_Stop: When it is active, if the
battery BMS failed to communicate with inverter, the
inverter will stop working and report fault.

Copied from Dye Revov manual page 34
Hopes it help

[Isetech]

Living and learning again.

An 8 kva inverter with a 5 kwh battery. It was time to add a battery.

Simple, when you know how.

Switch off the battery, connect all the battery wires taking note of the cable size and the charge discharge current. An 8 kva inverter can charge/discharge at 190 amps.

The battery terminals for a 5 kwh battery can only take a 25 mm cable, so make sure your fuse is correctly rated.

Once you have connected both the batteries in the configuration you require, in my case it is parallel cascade using a 125 amp fuse, to protect the system until I fit the additional batteries.
we will go into more details about that once I build the busbar fuse system for the completed unit.

You then need to add a comms cable between the master and slave using the in and out ports. The comms cable between the inverter and the will remain in the can port.

This is what you need to know:

You dont have to fully charge the new battery.

You dont have to balance the batteries.

There are NO dip switches on the IP 65 Sunsynk battery. So ther is no dip switch settings required.

You have to shut down the entire system, both batteries batteries and inverter.

If you only switch off the master and connect the slave battery, then switch on the master then the slave, the battery will not communicate with the inverter.

If you go to Libms, you notice that you have lost your battery communication.

Once the entire system is shutdown, inverter and batteries, you then switch on the battery you want to be the master wait until all the lights stop rolling and only the top green light is blinking, then you switch on the slave, wait till lights battery lights stop rolling, then you switch on the inverter and wait until the green light "normal" is on. At this point you can go to battery Libms and check if there is comms. IF everything is in ok , you will see the screen with the battery details.

You can then switch on the mains and the non essential.

You can do this a lot faster and not follow this procedure, trust me I have learnt, rather be patient and follow this procedure if you dont want to call the UK to get patched through to hong kong then china and back to SA

[Isetech]

If you are starting out like me and not a master installer, this is the place you want to visit. We are going to go into a lot of details, from the basic setting, like the time and site name all the way to whatever challenges I face while installing Sunsynk equipment. Hopefully it will save you the frustration of trying to figure out these silly things. the challenges you face when you are a small fish in a big pond.

At the rate things are going at the moment, it is not going to take me long to get to 100 installs. Hopefully by then I will be able to answer technical questions for people struggling to get started.

[Isetech]

Living and learning,

I didn't know that the 125-500 VDC for a the mppt is 500 VDC max for each MPPT, in other words you can install 8 panels with a 50 VOC (400VDC) per MPPT.

Still trying to wrap my head around the 8 kva unit 2 + 2 string, I sort of have it figured out, but need to spend a little more time to make sure.

[Dylboy]

Also what I learnt is for example the 5kw is 6500 maximum watt peak of panels.

Now if you take the 13A x 500V you get 6500. BUT this does does not mean 6500wp per MPPT it is the total.

So basically you can not exceed 6500wp with both MPPTs so then do 3250WP per MPPT.

Now I am still trying to confirm this as I would love to put 6500 on each MPPT, so one MPPT North and the other east to get the evening sun.

Sent from my CPH2197 using Tapatalk

[Isetech]

Sunsynk technical (I am a registered installer) so I can get technical advice They informed me that it is not advisable to exceed 400-425 VDC and never install a string with a VOC of 500VDC.

For a 5 kva Sunsynk inverter, it is not advisable to install more than 8 x 460 watt panels with a 50.01 VDC (VOC) per panel.

The ideal voltage is 375 VDC per string.

Just remember 125 VDC is the start up voltage, so you cannot connect strings less than 125 VDC per MPPT.

[Isetech]

A tip when setting up the site take note of the plant info capacity. It will determine the efficiency.

Dont put 5450, its KWp not Wp.

if you have 10 x 545 watt panels, it will be 5.45 KWp

I know a silly mistake, but hey, living and learning.

[Dylboy]

A tip when setting up the site take note of the plant info capacity. It will determine the efficiency.

Dont put 5450, its KWp not Wp.

if you have 10 x 545 watt panels, it will be 5.45 KWp

I know a silly mistake, but hey, living and learning.

Did the same thing.... Had it as 5500kwp hahaha, that charge never moved ever until the client asked but it and I read it properly haha

Sent from my CPH2197 using Tapatalk

[Justloadit]

I have heard over the grape vine that Sunsync will no longer be imported, but replaced with a number of Deye models. Note not all Deye models are IP65. Check the specs before purchasing.

[Isetech]

I find this hard to believe, considering the lads from Sunsynk will be visiting SA soon to launch some new products. Maybe the plan is to integrate Sunsynk into Deye or the other way around.

I would verify this information with the Sunsynk supplier who supplies all the wholesalers and most of the installers with Sunsynk products.

They both come out the same factory, its only the software that is different.

Maybe Deye will be supplied with Sunsynk software.

It really makes no difference, same quality, same factory.

I have heard over the grape vine that Sunsync will no longer be imported, but replaced with a number of Deye models. Note not all Deye models are IP65. Check the specs before purchasing.