jumper

Sorry for the late reply. It looks like you have the correct pinouts on the cable and you are using the correct ports, I think the problem is the inverter firmware doesn't have the Lib and Lic protocols which were added later. Most likely you are going to need to update the firmware on the inverter, unfortunately I don't know what version is for the King, it might be best to ask your supplier first and then maybe ask voltronic support if you don't come right. Unfortunately inverters are rarely delivered with the latest firmware. You will have to have the Lib setting on the inverter for it to work as the Pylontech protocol is different and won't work with your battery as you already discovered.

If @Steve87is around then he might be able to help you out. He seems to be the most knowledgeable person on the forum when it comes to the Freedom Won batteries.

Hi tekoa, if you have successful comms then the battery icon on the inverter LCD should flash. It may be on the rack mounted version that the outline around the battery icon will flash as the screen is different from the regular king. The easiest way to tell is if you don't get an error. If you have selected the Lib battery setting and the comms are not working then after 3 mins you should get a beep and error 61 and after 10mins the inverter will stop charging/discharging the battery.

The instructions for how I got it working are in this post: That whole thread has a lot of other helpful info in it too.

I don't have that version of inverter so I don't have the original CD, but you can find some watchpower downloads here https://www.mppsolar.com/v3/download/ under monitoring software. Hopefully they have fixed it on their side and you won't need anything else.

You can try the software at http://multisibcontrol.net/ it has a console tab where commands can be sent to the inverter.

I can't help with the software, but looking at that CD, it doesn't look very official, it may very well be that they are selling clones and not original Voltronic machines.

If you want your batteries to last then you should rarely go below 24V which is most likely the highest setting for cutoff on your inverter, I have pretty much the same setup and unfortunately the firmware doesn't allow a higher setting. Generally with lead acid you should not be using more than 20% (12.5V) on a regular basis before charging or the lifespan is shortened drastically. In an ideal situation the cutoff should be around 25V if the inverter allows that.

Parameter no 81 "Cycle cumulative capacity". I changed it from 20% to 90%.

After changing the setting I am now only at 73 cycles in 6 months, using 30% per night.

There was apparently a batch with a bad diode which caused SOC issues, but it seems nobody had any problems having it repaired for free under warranty without question. I've been running my battery for 6 months without a problem. There is a minor issue with the cycles counting with every 20% discharge, but that seems to be for a lot of different batteries using the seplos BMS, it's just a default setting in the BMS parameters that's set incorrectly, nothing wrong with the battery itself.

https://cdn.shopify.com/s/files/1/0347/8876/9932/files/Synapse_7.2M_manual.pdf?v=1620977352

The shoto batteries look to be very much the same inside, it's just the housing that is different. The SDA10 is a rack mount battery and the SDC10 is stackable. They are both 16S 5.12kwh LFP batteries and use the same seplos BMS.

Here is a great example:

multisibcontrol.net Back to grid is the lowest you want the battery to go before it will attempt to use the grid to recharge it. If there is load shedding it won't be able to so you need to leave some juice in the battery for that case. If there is no grid when this value is reached then it will keep going until it reaches the cutoff voltage setting. Back to discharge is the lowest voltage at which you want to allow it switch back to using the battery once it has been charging. If you have no panels then this should be set to full (or your bulk charge value) so the battery charges fully every chance it gets when there is grid available.

Don't get confused between the lights flashing on and off and the battery going in to standby when it is balancing. When it is almost full it will keep changing status every few seconds between charging, standby and discharging and it can look like they are 'flashing'. The only problem with this is the battery might not be at 100%. 4 lights on means it is 75-100% and in discharge status.

It will be all the time as the current of all panels will always be dragged down to whatever the lowest panel can produce if they are in series.

FYI, the Shoto is a 1C battery. This is from the manual:

It might be helpful to add the load to these graphs as that will influence the PV generation. If the battery is full and there is no load the PV will idle as there is nowhere for the power to go.

That looks ok, it just doesn't say if it is a ftdi chip or not, send a link to the website and I'll take a look. I'm pretty sure it will work, it should only be 30 bucks if it doesn't.

Should work, looks like the one I have from microrobotics. Make sure it's ftdi. Microrobotics is ftdi even though the site says it's CH340. Make sure the drivers are correct, windows should sort it out automatically.

Pin 1 on the RJ45 plug goes to B (D-) on the adapter and pin 2 goes to A (D+) You can also use pins 7&8 instead of 1&2, they are mirrored.

Agreed, even the seplos manual is confusing as can be seen in the image below. Standby and over voltage protection looks exactly the same. If you want to see exactly what your battery is doing you can hook it up to a PC with a R30 2-wire RS485 to USB adapter and connect with the seplos software.

It is not necessary for the battery to work properly, I don't have comms to my battery, but some say it affects the warranty. My battery has been working perfectly for 6 months now with USE settings. I just realised that I've never seen an axpert with a bms port on the side like that, does the manual say it is for bms? What are the pinouts in the manual? Where did you get the cable you are using?

Apologies, that was the wrong video, I don't think that box is still available. I'm not sure of exctly which models have which settings. If you have a bms port on the inverter and the Lib and Lic settings then you should be able to connect directly otherwise just use the USE setting and set the values yourself. The values @Douw G. Gerberhas given look perfect, you don't need to go as high as 56.5V for bulk.