April 8, 20242 yr Hi I recently purchased a 8Kw Sunsynk inverter with 2 X Hubble AM2 batteries . Does the inverter see 2 batteries as one ? I have set the communication cables between batteries and inverter , using the supplied CAN cable from CAN port to master battery and used the supplied cable that came with the batteries ( normal RJ45 grey cable ) to connect the 2 batteries together battery link port . Dip switch setting on 1st battery is 1 on all others off and 2nd battery 1 off 2 on and all others off . Are my settings correct ? Seems like the inverter is seeing only 1 x battery . After a 100% SOC this morning the battery SOC is 40% .
April 8, 20242 yr Share your LI-BMS page or pic from the inverter. All the details are displayed there as to what is going on...
April 9, 20242 yr Author This is the usage graph from this morning 12am . Do you think 2 X 100Ah batteries can drain like this ?
April 9, 20242 yr 14 minutes ago, VJC said: This is the usage graph from this morning 12am . Do you think 2 X 100Ah batteries can drain like this ? The discharge from 60 to 40% SOC is pretty much in line with the load drawn from 00h00 to 05h50. Very strange to see the sudden drop to 0% SOC. Perhaps share your settings including timer settings. Looks odd that the battery discharge power is higher than the load over the graph period.
April 9, 20242 yr Author Hi Scorp007 The SOC remains at 40% . The battery power drops to 0 as the grid kicks in . Settings posted in previous posts . Thanks
April 9, 20242 yr We still waiting for the LI-BMS screen on the inverter. It will solve a lot of questions we have.
April 9, 20242 yr Ok so we have established there is definitely BMS communications & not just for one battery but for both 100ah units. So that means that all of this information of SoC dropoff or whatever Is happening is BMS related... Can you confirm that the batteries share there SoC equally? When master is at 50% the Slave is also at 50% or thereabouts ??
April 9, 20242 yr As a test I would deploy one battery at a time & hook them individually to the Sunsynk & observe what happens to each of them. So one battery off, one battery on & use Comms & make a cycle & observe the SoC & BMS behavior.
April 9, 20242 yr 2 hours ago, VJC said: Hi Scorp007 The SOC remains at 40% . The battery power drops to 0 as the grid kicks in . Settings posted in previous posts . Thanks That graph seems like quite normal behaviour to me. There's a setting on your inverter such that the battery doesn't go lower than 40% SOC whilst there is grid. This is so you will alway have a certain amount in the battery if the grid goes down. What we see here is SOC not going past 40% and the system stops drawing from the battery and starts drawing from grid - leaving that 40% in the battery.
April 9, 20242 yr Author Thanks Steve , how do you determine that the inverter is seeing both batteries ? Both batteries SOC are the same , according to the battery LED's . Will however do the test with 1 battery at a time .
April 9, 20242 yr Author 8 minutes ago, Bobster. said: That graph seems like quite normal behaviour to me. There's a setting on your inverter such that the battery doesn't go lower than 40% SOC whilst there is grid. This is so you will alway have a certain amount in the battery if the grid goes down. What we see here is SOC not going past 40% and the system stops drawing from the battery and starts drawing from grid - leaving that 40% in the battery. Hi Bobster Thanks , yes i have set it to keep SOC at 40% just in case of the dreaded LS .
April 9, 20242 yr 4 hours ago, VJC said: Hi Scorp007 The SOC remains at 40% . The battery power drops to 0 as the grid kicks in . Settings posted in previous posts . Thanks Sorry my mistake. I looked at the battery power line and took it for SOC.
April 9, 20242 yr 5 hours ago, VJC said: This is the usage graph from this morning 12am . Do you think 2 X 100Ah batteries can drain like this ? According to your graph the battery soc at 12 was 60%. Your load over 6h roughly 1.5kwh. You are cutting the battery off at 40%soc. You have 10kwh total battery capacity but you only utilize 60% so 10kwh x 60%=6kwh. By 12 you already used 40% so remaing 20% of 6kwh = 1.2kwh so your load consumed the 1.2kwh by around 6. To me your battery capacity is in line with your load consumtion. Any reason you don't adjust your cutoff to 20%soc.
April 9, 20242 yr Author Hi TaliaB I keep the 40% SOC in case of LS and another reason is that I live in an area where the grid is so unstable due to cable theft and unplanned outages especially at night . But i will probably adjust it 20% SOC due to no LS . Thanks .
April 9, 20242 yr 39 minutes ago, VJC said: Hi TaliaB I keep the 40% SOC in case of LS and another reason is that I live in an area where the grid is so unstable due to cable theft and unplanned outages especially at night . But i will probably adjust it 20% SOC due to no LS . Thanks . I understand. What is your total average load usage in 24 hours or monthly. I was thinking around the lines of load shifting so that you have coverage over the 24 hour period. What is your pv array output in kwh on a good sunny day or week. Maybe put a timer on geyser or pool pump so that it is covered during the day time hours. When are you using the most appliances morning or afternoons?
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