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Antonio de Sa

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Antonio de Sa last won the day on October 7

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  1. Apologies, I was under the impression the system comprised of 2 X 5000 KVA inverters. 3 KVA it will even be risky to run a microwave.
  2. @Vos J I don't understand how you can have trips with 10 KVA of power from the inverters. the inverters should be able to handle 10 KVA. You talking just over 3 Kw I have the same installed, OK different inverter, I have the ES type = high power your client have the TL = Low power. I can run the my 3 Kw geyser from about 10 o'clock in the morning and, run the stove +_ 3 KW in the evening for +_ 1 to 1 1/2 hours Something wrong with the settings. I have setting 1 on SBU= solar, battery, utility. and setting 14 on OSO = only solar charges the battery I have 18 on ENA, got to say never had an overload yet. you must make sure that you have set your inverters to run in parallel, one will assume the place of master the other as slave. as an example the last hour on my system in this picture, already running the oven over 2 KVA and still enough to supplement the battery.
  3. @Buyeye No, it did not sound as you saying I was doing something wrong. I think here the main issue is having is having 10 KVA of power from the inverters. That is why I can comfortably use the stove, if not enough power in the battery, the system will switch over to mains. so far so good, did not have to do that yet. If I had another 5 KWH battery in days like we been having lately I would be completely of grid. As I can see from my monitoring system' allot of solar energy is waited between 12:30 until about 16:00. I presume when the rains finally arrive will be a different scenario. Also let's see what happens in the winter.
  4. @Buyeye I had a problem with the BMS tripping my AC supply breaker to the inverters, I think that was because I was feeding the inverters from my earth leakage on the Distribution Board, I've since changed that, the inverters are now supplied direct from the mains via a 63 Amp double pole CB and back to the DB via a 63 Amp earth leakage. I have not yet tested the BMS with the new set up, will do it next weekend. So far I don't have a problem switching on my 3 KW geyser, when I switch on the geyser I make sure there is enough PV generated by my panels to do the job, I have about 4 KW of power on a sunny day by about 10 o'clock. The stove is a normal reactive power stove. Usually we use about 3 KW/H of power to do the cooking every day, so I have enough stored energy in the battery to cope with that consumption.. Just a question ? I'm I doing something wrong ? so far I don't have any problem, apart from discharging the battery during cooking from 100% SOC to +_ 40% SOC. As you can see from the picture bellow I've switched geyser on just before 10 O'clock using 3 KW and my PV was generating just over 4 KW From about 11:30 it's just idling basically just keeping battery at float voltage
  5. @Nexuss, thanks for the feedback. Unfortunately by the time the wife finishes with the cooking there is only +_40% SOC, thus not enough to run the all night. With 60% SOC I'm pretty sure would have enough energy accumulated in the battery to last until sun rise. Maybe I should invest in a new battery. The spec on my battery. My settings cut voltage is set at 46 V, hence I never fully discharge the battery. Battery spec call for floating voltage @ 54 V and the inverters do that exactly. Presently, according with the battery info I'm using two cycles per day, I think with an average of 2 per day my battery should last at least 7 to 8 years, possibly longer. I've reduced my grid consumption from an average +_ 24 units/day to +_ 4, tremendous savings on my electricity bill, I'm very happy with that indeed.
  6. I'm really new to this, I would like to know the opinion of the experts. I'm a bit concerned regarding the usage of my battery. I'm not sure if I'm using it correctly in order to maximize it's life span. Not using BMS, I'm using the settings on the Growatt to charge, discharge and float voltages. I have 2 X 5 KW growatt inverters and 12 X 400 W 1 X 5 KWH LI Battery On a nice sunny day by about 10:00 AM my battery is fully charged, and my PV is generating over 3,5 KW. I then switch the geyser on, in about an 1 hour and 1/2 the geyser thermostat switch the geyser of. After 12:00, the system is idling, basically just trickle charging the battery. From about 16:00 in the afternoon wife starts cooking and we start to use some of the accumulated battery power. Usually by about 22:00 PM battery is at about 10% SOC and switches over to mains. During the night every 2 hours or so when battery voltage drops to +_ 48 V the system uses mains to charge the battery to about 51 V. See picture bellow of the last 24 hours. Please some advice will be highly appreciated.
  7. Good day to all. At the moment I'm monitoring my system using Growatt PV Inverter Modbus RS485 RTU Protocol, very happy with the information I presently get out. However, even though I get the battery information via the Growatt Modbus I would like to connect directly to the battery PS485 port and read it directly from the battery. Does anybody perhaps have that specific Modbus protocol.
  8. I would like to get a bit of feedback from the Gurus. Herewith last 12 hour My main concern is how I'm I using the battery
  9. I have 2 X 5000 ES, I've noticed that the output voltage is slightly different. See image bellow. Also noticed that once we started load shedding the output frequency is more stable, it looks like if there is mains my systems runs on the mains frequency We are currently running on my batteries due to load shedding Could this be a problem? maybe they have different firmware versions. See pic.
  10. Good day to all, Data logger system that my son programed for my two 5000 ES growatt inverters. I'm really very happy with
  11. Tunuva, One question, at the present moment I still have a problem in connecting my BMS to my 2 X 5000 ES inverters, I'm running the system without BMS until I resolve that issue. So far what I've done is using the growatt parameters to limit certain values. Herewith graphs of my system in the last 24 Hours. Top right is charge discharge of my batteries, I've limited the charging current to 48 Amps, battery OEM recommends 50 Amps Max voltage to 56 V and cut out at 48 V. What do you think?. As one can see I manage to rum my house on battery power till about 11:30, then run on mains, you see every about two ours Blue spike, the inverters charge the battery for a while using mains, basically just to keep it alive. question is I'm I damaging my battery?
  12. Antonio de Sa

    BMS Issue

    Arya, best of luck with Growatt technical support, ( it does not exist) my experience is the following, contacted them a few times, still waiting and waiting, eventually I gave up. Also have issues with BMS coupling, eventually I decided to just run the system without BMS. contacted both these mails [email protected] and [email protected] and as I said above still waiting.
  13. Howard, After lots of experimenting on my system I've found that SBU was the most suitable in my case, I have 2 X 5000 KVA and just one battery, looking at my graphs I'm not making use of all the power generated by my panels. I have to invest in another battery. So far I've managed to get my geyser ( 3 KW ) to temperature and enough accumulated energy in the battery to do all the cooking in the evening. I've managed to reduce my daily consumption to just +_ 5 KWH using setting SBU from about 16 KWH with setting SOL. Also I have setting 14 on SOL, I don't want to use Eishkom power to charge my battery. By the way I think we were colleagues @ ABB.
  14. No, we are using Modbus interface via USB, I'm not the one doing it, my son is the one busy developing the software for me, I'm clueless when it comes to software design.
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