Recent content by Jon

  1. J

    Kia 64kWh Battery

    Im pretty sure the Kias are running pouch cells, I know they are in the E-Niro
  2. J

    Did EVERYTHING just change??????

    2 totally unrelated pieces of info; If you want a big battery its cheaper to by a Kona EV in Aus than it is to buy the equivalent kWh in a powerwall. Battery degradation in utilising an EV battery for home supply will be negligible I believe, both the charge/discharge rates will be very slow...
  3. J

    Did EVERYTHING just change??????

    I think that if you have an EV it should be your primary transport vehicle. If the EV is home a fair bit charge it straight from solar rather than using solar to charge a battery to then charge the car. Itd be a shame to have an EV & solar and do most of your driving in an ICE vehicle. We have...
  4. J

    Used panels

    I agree with your reading of the rules. I do believe this allows you to add more panels to system if not claiming rebates.
  5. J

    Used panels

    Im not sure if its the same all over but in Qld Australia you can install bigger systems than 5kW inverter capacity on single phase with an export limit. My system is 7.5kW AC, 10kW DC with a 5 kW export limit. If youre making plenty in the summer and not enough in the winter Id be looking at...
  6. J

    Used panels

    Over 2/3 of my system is 2nd hand panels, running microinverters so no need to match them as they all generate as individuals. String system wouldnt work for us as roof shape is a bit odd, 52 panels spread over 9 different faces. Also have another 12 panels wire 4P 3S to run a DC swimming pool...
  7. J

    Anyone own a Tesla?

    Not a Tesla owner, a Kona EV owner. Just ticked over 12,000km in 3 months, 85% charge direct from solar with a Zappi charger. 3 months, fully electric 3 person house including hot water, 10kW solar PV, 5kW export limit, 10,000km, Au$220 power bill. Go for it, you wont regret it.
  8. J

    AC Coupling with Grid Tie System Retrofit

    Hi Theres no issue with large format cells going in parallel. All cells in the system obviously need to be the same chemistry for voltages etc. From there its a bit more flexible. Think of your pack as a matrix of Series and Parrallel cells, say like a spreadsheet of columns and rows. If your...
  9. J

    AC Coupling with Grid Tie System Retrofit

    Thanks Korishan Tobias is using large format cells, that is why I suggested swapping cells to troubleshoot. I would also recommend doing the same with packs where people have packs paralleled to find out which pack has suspect performance.
  10. J

    AC Coupling with Grid Tie System Retrofit

    It is possible to double up with shunts and BMS, I personally wouldnt, especially if youre using new cells. Your first string will be 1P??S (Im not familiar with LiPo). That being 1 cell in parallel and ?? Cells in series. When youre first setting it up Id decide how many packs you may want to...
  11. J

    AC Coupling with Grid Tie System Retrofit

    If you add a second bank use heavy Busbars to connect 0v and 48V of both packs and run from these bus bars to your inverter charger, single shunt on the 0V side. Then connect each cell to its parallel twin with smaller cable, this will let your BMS treat each parallel cell as a single cell, you...
  12. J

    AC Coupling with Grid Tie System Retrofit

    Hi Tobias For the Multiplus (or whichever inverter charger you use) to know when to change the battery from surplus power or discharge so that you dont import power. The easiest way this is achieved (in the case of using Victron gear) is to use a CT clamp on the incoming power of the circuit...
  13. J

    AC Coupling with Grid Tie System Retrofit

    Hi Tobias Id recommend using a Batrium BMS, mainly as it has been proven to work with the Venus GS already. Id also set up your battery pack so its easy to parallel packs as you increase the capacity. To do this is pretty simple, connect your 0v and 48V terminals to bus bars then to your...
  14. J

    Combine separate arrays or not

    Hi Doin it Sounds like you have a good plan :) Is it feasible to put a smaller element in your HWS so it draws a bit less current and run it for a bit longer? A 2kw element running for 2 hours will let you get all your hot water without any import, to me the little optimisations that are a one...
  15. J

    Combine separate arrays or not

    Had you thought of leaving one (or both) sets of panels connected to the grid to inverter/s and either; With one array connected to the grid tie inverter and the second array charging the batteries. Or Leaving both arrays connected to the grid tie inverters and AC coupling the batteries. Do you...
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