brburger

Thanks guys, appreciate the help. I will use the settings given and see how it goes

I have purchased a 12v lifepo4 battery (4 cells) and a 12v 1200w axpert typre inverter. This will be used at a holiday home to power a tv and wifi router during loadshedding. No solar panels. I would like some advice on what an appropriate bulk and float voltage should be, and also if these 2 should differ ( float being lower than bulk). Currently I am using 14.0v bulk and 13.7v float, does this sound right? I have noticed that many battery suppliers suggest a bulk and float at the same voltage? Would it be better to have both at 14.0v then?

Hi Guys I am sure this has been asked and answered, but I just want to make sure, please. The CT coil on the 8kw sunsynk inverter, to which pins does the black and white wires go? I currently am using pin 5 and 6, but the CT is showing a negative value (only trickle applicable as no drawing from grid), the grid shows positive 30watt and CT negative 30watt, is this correct. If not, is the CT wrong way around or perhaps the black and white wire wrong way around on pin 5 and 6???

Guys a followup question. I am very new to sunsynk and previously had a growatt system. My previous system I could change the charge priority to UTL from SBU to charge the batteries should the need arise. Is there an easy way to do this with sunsynk other than changing charge percentage and time in system setting?

Much appreciated, makes total sense. Thanks chaps

Aaaah. That makes sense. So then am I correct to say that the soc for any time period will be the minimum and system will either keep it there if soc decreases to the specified, and if it is under, then will charge to specified minimum, eiher from grid or not depending on selection?

Hi Guys If my timer settings were as below, could anyone give some clarity on the following please as I am trying to best understand the timer: 1. Am I correct in assuming that excluding 10h00 to 12h00, the system will charge the batteries from the grid should they drop below 20%, and that should the batteries drop under 50% between 10h00 and 12h00 the system will charge the batteries from the grid? 2. If I am correct with my assumption in 1, then to what level (SOC) will the batteries then be charged if they drop below the specified SOC (20% at all time and 50% between 10h00 and 12h00, as above). Basically assuming for example the battery drops to 20% at 1h00, the system will then charge from grid, but to what level of SOC, perhaps 100%? 3. Assuming for example again that system drops to 20% at say 3h10, the system will charge from grid, but then at 3h30 the system enters a "new" time period as specified (3h30 - 4h00), what will then happen? Basically one then assumes that the system starts charging from grid at 3h10 when it reaches 20%, then at 3h30 it may be at around 25% due to the charge from grid......will charging then stop as the new time period starts and system is over the specified minimum? Sorry for all the assumptions, but trying to understand this. If my thinking is correct (and I am not sure it is, thus asking) then if the system reached the lowpoint SOC during a specified period, then it charges from grid and does so either to 100%, or until the next time period as specified on the timer when a new set of parameters come into effect? Is this correct?

Hi. I am considering a new solar system but have two options and would like some guidance to make sure I make the correct decision. I am decided on a 8kw sunsynk inverter and 14 panels, the decision is do I go for 1 x 10.65kw sunsynk battery, or 2 x 5.32kw sunsynk batteries? I have sort off decided on the sunsynk brand batteries coupled to the 8kw sunsynk inverter as this effectively gives a 10 year guarantee on the system, does anyone have any comments on the sunsynk batteries? Are they worth the premium and am I correct in my thinking that the sunsynk batteries are made to work with the sunsynk inverter, thus to go that route?

Anyone know what the administrator password is for PBMS tools in order to change a parameter setting on battery?

Hi Guys Would anyone perhaps have the recommended bulk and float charge voltage settings for the Mecer M3000 LIPO battery?

I have axpert type inverter with 4.8kw lifepo4 (15 cells). Currently my bulk is 51.6v and float 51.5, but I would like to increase as I think batteries not charging fully. Could someone assist with what voltages I can safely use for bulk and float?

Hi All. I have a simple setup with 2 x axpert type inverters, 14 x 450w panels and 2 x 4.8kw batteries. Each inverter has a datalogger connected to them and connected to my local wifi.The app used is called SmartESS (also has a desktop version). Can anyone provide me some guidance on a better alternative app that would work with my dataloggers? The dataloggers plug into the serial ports of the inverters and are not raspberry pi. Any advice or suggestion would be appreciated

Coulomb, sorry for the possibly silly question, but what exactly is "float voltage", and how does this have an effect on battery life? I have my float voltage set at 51.5V and bulk at 51.6?

I have changed the setting on 13 from 51v to 49.8v and will see at what SOC it reverts back to batteries, I am hoping for around 60%, but will have to work with the voltage to get the correct figure corresponding to around 60% SOC. I have also confirmed with supplier that setting 13 can be lowered. I have my settings as per the recommended settings from battery supplier, I have only now changed the "back to utility" to 48.2 which in my case happens early morning when there is very little load (under 300w) and equates to about 27% SOC on batteries. The batteries have lcd screens which show voltage, SOC, SOH and charging/discharge current, this info is coming from the bms as it is on the actual battery and thus not the inverter making an estimate. I have also now changed the "return to battery" voltage to 49.8v so that the batteries are not charged full from utility, but only to around 60% (this is an estimate and I will work with the voltage figure to get to the 60%) as I have sufficient solar generation between 3 and 4 hours after the batteries have drawn down to "return to grid" at 48.2 volts/ 27% SOC.

Under menu item 14 it has a "battery full voltage". This I can confirm is the voltage it goes back to grid at. Can this be lowered to say 50.5v to force charging from grid to stop at a lower percentage than full? Then just lastly, my batteries have there own BMS, do the batteries then basically look after themselves?

Hi all. I have a fairly new PV system installed and was hoping someone could give me some guidance and good advice. My setup consists of 2x 5.5kw Axpert MKSii inverters in parallel, 14 450w panels (7 to each inverter) and 2x 4.8kw lithium batteries in parallel. System settings are as follows: Priority SBU Bulk Charge voltage 51.6v Float voltage 51.5v Low voltage (return grid) 48.2v Low voltage cutoff 46.4v AC charge current 20A Total charge current 30A Battery full voltage 51.0v The system works well, I just want advice on whether my settings are ok? I also have a question regarding the cross over to grid and the return to solar: I understand that at 48.2v (approx 27% SOC in my case) the system will switch over to grid and will stay there charging at 20A until the batteries reach 51.0v. In my case this is around 3.5 hours as it sometimes happens around 5am and there is little load on the system. Is there a way to set the system so that it for example only charges to 75%? Thus using less utility power in the hopes the solar will charge the balance when it starts later on. Also, if the system has reverted to grid and draws 20A to charge from grid, does it also use the solar energy to also charge the batteries (up to the 30A total threshold?), or is the solar lost whilst it is on grid?