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zivva

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Everything posted by zivva

  1. It is normal that BMS shuts off if there is no charge or discharge current and no communication. Only 1 minute delay is a bit light, it's generally closer to 5 minutes, but it is expected.
  2. It's parallel connection here, not series. Manufacturers generally forbid the use of other batteries with theirs ... As they want to sell you their batteries Still they have no way to tell if their battery has been used with another one ...
  3. As long as packs are on the same voltage (15S, then 48v), no problem. Your installer either lacks basic training in his trade or just wants to sell you a battery ... If both batteries use the same BMS, it's even better as you can set them up as slave & master then both can communicate with the inverter. If electrical connectíon for both batteries is different, you could use busbars : - 1 busbar for +, 1 busbar for - - 3 points of connection for each busbar : inverter, battery1, battery2 You can buy an overpriced busbar (Victron for example) or DIY : a piece of pure copper large enough to accomodate 3 cable lugs and sized vs batteries cables. Typically 35mm2, then busbar = 3.5mm x 10mm x enough length to accomodate 3 lugs. Something like 100 mm ... Should cost you no more than 10 USD for 2 busbars of that size. Even if batteries were of different voltage (15S/48v + 16S/51.2v), you could mix them : BMS of each batteries would stop accepting charge / discharge at individual cut-off anyway ... That might not be practical if one fully cycle their batteries as some BMS may shut down when battery reach cut-off but it's feasible ...
  4. That side of the inverter is serviceable as fans are supposed to be removed & cleaned on a regular basis in dusty environment. The warranty void sticker is on the other side of the inverter if you remove the heatsink or access the PCB and other components ...
  5. The 3 fans should run at the same time, they are all connected to the same supply. You could check they are all connected properly : each use a 2 pins connector and you can access them by unscrewing the 2 metal plates they stand on. Either a quality control issue (unlikely, a very basic check ...) or customer played with the fans ...
  6. 1. Yes. From Sunsynk & some battery manufacturers in their setup guides for Sunsynk. 2. Doesn't make any difference : charging voltage is limited by the BMS. - if Lithium mode selected (com between BMS & inverter then). Battery charging voltage = pack over-voltage setting of the BMS. There is no float. Battery reaches BMS OVP then charging stops. Batteries are kept @ BMS OVP V. At least for Seplos. - if AGM mode selected (no com) : max charging voltage = BMS OVP. If you set lower voltage, batteries get charged at that voltage. If you set higher voltage, batteries gets charged at BMS OVP max. This is also valid for float & equalization voltage if you choose to use them. Any voltage > BMS OVP = ignored ... 3. Endless debate. Some want to charge at 3.65v / cell, other @ 3.4v / cell. Typically you can charge < with automative / grade A cells which are all of a very close balance and capacity or you use an active balancer. Charge > with regular cells or passive balancer to give a chance for the running cells to get properly balanced ... IMO, setting up AGM voltage when using Lithium mode as per Sunsynk videos & some batteries instructions is more a backup if com fails (how come ?) and BMS fails (again, how come ?) And BMS com failure error disabled. As if no failure, BMS dictates charging voltage ...
  7. Got that model and as per all models, CT is external & normally provided with the inverter ...
  8. 31° is absolutely not an issue but is more or less an expected temperature when charging. You could start to worry above 40° ...
  9. Actually found it : - yellow pin 4, RS485B - black pin 6, RS485A - red pin 8, ground
  10. Looks like the one You have 3 wires on the cable : RS485A, RS485B, ground ... Red, black & yellow. Can't remember exactly what colors do what though but I still have the EPEVER wiring diagram, just check the RJ45 end to match. No need for the ground ...
  11. Here's the temps from Solar Assistant. The MOS temperature is the "ambient temperature" when checking with Seplos software ... Charging @ 100A, temperatures a bit high
  12. Tried various ones, all works as long as they have a FTDI chip ... But I got fed up of the typical converters with the green terminal blocks and tiny screws where RJ45 wires never fit permanently ... Now I'm using a USB / RJ45 cable made to monitor EPEVER charge controllers (cable CC-USB-RS485-150U), just need to recrimp the RJ45 end to match the Seplos RS485 pins ... I believe that cable is available pretty much everywhere for a price equivalent or cheaper than the converters ...
  13. The "ambient temperature" of the Seplos is not the temperature of the room but the temperature inside the case of the batteries. That sensor is generally installed on the PCB of the BMS, near the MOSFET, thus the high temperature at the end of the charging cycle ... That sensor generally reach +35° on my batteries (Rosen with Seplos) at the end of the charging cycle when the room is at 25°.
  14. Number in yellow is not a warning, it just means it's close to the limit you set. if you set max charge current to 100A, number will turn yellow when charging at +80A ... if you set max charge current to 40A, number will turn yellow when charging at +30A ... Batteries getting to +30 degrees when charging is totally normal : producing energy generates heat. When decreasing charge current, you slightly decrease the batteries temperature (1 or 2 degrees top) but they generate heat for longer ... If you want your batteries to stay at 25 degree, you need an AC to keep the room at 20 degrees or less. Anyway, batteries getting up to 35 degrees is perfectly fine : in theory you loose a few hundreds of cycles. You'll get 5000 cycles instead of 5500. 14 years instead of 15 years ... not worth the cost of running an AC 24/7 The recommended operating temperature (the temperature of the room, not the temperature of the batteries) is listed in your data sheet : +15 to +35 degrees. Manufacturers advertise cycles @ 25 degrees (operating temperature, not the temperature of the batteries !) to give bigger numbers but most users operate their batteries at much higher temperatures ... I'm not sure of the benefits of running a fan to cool the batteries : if the room is hot, fans just move hot air. In a cool room that would make sense, in a room close to the temperature of the batteries it doesn't ...
  15. Example here ... Battery BMS limits charge current to 20A and discharging current to 100A. You have com between inverter & BMS here. If you disconnect the com cable, battery will still only charge at max 20A or discharge at max 100A. Really, you should try
  16. See attached Seplos BMS manual about current management by the BMS. All BMS manage charge & discharge current. Inverters just do what BMS demands ...
  17. Yes. The cable provided with the inverter (should be yellow ...) should be straight.
  18. Maybe you should try ... And learn something
  19. You can setup your inverter to charge your batteries at 500A if the battery BMS only accept 50A, your inverter will send 50A. Communication between the inverter & the battery doesn't matter for that purpose. Communication between batteries allows to balance charge when 1 battery is full & the other not yet. Current flows between batteries instead of having the full battery not accepting any more current & the not yet full battery being charged by the inverter. In theory you could connect all your batteries without any com between them or the inverter, still each BMS of each battery would close their MOSFET when cells voltage reach the BMS limits of charge or discharge. No way to monitor what is happening then but it would work. The only reason manufacturers don't want customers to use different brands in parallel is because they want to sell you more batteries. As long as all batteries are of the same voltage (48v or 51.2v), no problemo ...
  20. All solved by removing com between inverter & batteries, using voltages only and living the BMS of each battery does its job : stopping charging but equalizing cells when batteries are full. Monitoring with Solar Assistant, all fine ...
  21. Right ... Except there is no reason a battery module gets overcharged because the other one would have stopped charging. Batteries BMS limits voltage & current for each batteries independently. If one battery stops charging, the other one will only accept voltage & current within limits of its BMS. Same for discharging : within the limits of each battery BMS. If load > battery capacity : use candle. Communication between inverter & BMS does not change the problem ... The only way to solve that issue aka good design is oversizing. If ever batteries may develop such issue ... Which is unlikely when the only job of a BMS is to not allow over or under charging or discharging.
  22. BMS protect the batteries. Communication between the battery BMS and inverter is totally optional : communication or not, BMS stops charge or discharge if out of specs ...
  23. Looking at your battery manual, you may be able to use a straight cable after configuring the dip switches for CAN-L and CAN-H on your battery ... Sw1 : 1 & 2 up (enables CAN) Sw4 (CAN-L) : 5 up (wire # 5 on the Deye side) sw5 (CAN-H) : 4 up (wire #4 on the Deye side) Should work
  24. Deye supplies a straight Ethernet cable with the inverter, for parallel communication when inverters are setup in parallel : not the custom cable you need ... Looks like another cowboy "installer" who can't read manuals. Anyway, without the proper cable (easy to do if you have an RJ45 crimp tool & spare connectors on hand ...), You need to leave the inverter manage the batteries with percentage or voltage. Percentage being very approximate untill you fully discharge & fully charge the batteries for the inverter to figure out a more precise %. Easier to use voltage to avoid inverter reporting 40% when the battery is actually closer to 80% or the other way around ...
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