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Recent content by JohnRatsey

  1. J

    Solaredge 2G network

    Unless the inverter is connected to the household WiFi.
  2. J

    Supporting a second PW2

    My first Powerwall was wall-mounted with the bottom a couple of inches off the garage floor in case a leak from a nearby tap made the floor wet. A second Powerwall was added last year and placed on some wood of suitable thickness to match the first PW. So far, no problems. In reality the load...
  3. J

    Recent Odd Charging Behaviour In Time Based Mode

    It's more a case that the local distribution networks have been designed around a voltage drop between the nearest transformer and the users. If the power flow is reversed due to lots of solar generation then there might be unacceptable voltage rise at the users' end of the line. Usually the...
  4. J

    Recent Odd Charging Behaviour In Time Based Mode

    I too would like on option to set a maximum charge level. One workaround is to shorten the period of cheap electricity in the app. There would be a bit of trial and error but looking at my historic data suggests that one hour at 5kW charge rate increases the battery charge level by 30%.
  5. J

    Powerwall Overnight Charging Rate

    I know from previous winters that the 3.7kW charging rate isn't quite enough to fully charge an empty Powerwall in 4 hours.
  6. J

    Recent Odd Charging Behaviour In Time Based Mode

    The installers said that's the way they do the configuration although there was correspondence between the installer and the DNO prior to installation. The grid code used is 50Hz_230V_1_G99_2018_UK. I note that the National Grid G99 guidance document differentiates between generation capacity...
  7. J

    Recent Odd Charging Behaviour In Time Based Mode

    Last April I had a 2nd PW installed along the a backup gateway (not available when the 1st PW was installed in April 2018). Since then the winter charging in time-based mode has been at 5kW per PW until the charge level reaches 95% whereupon the charge rate reduces. Previously the single PW...
  8. J

    3 Powerwalls only charging to 87% from grid on time base control

    If you've also got solar panels then the system will be looking at the solar generation forecast and, when a sunny day is forecast, may be leaving some battery capacity available for the solar generation. That's what my system does.
  9. J

    Powerwall 2 & Gateway Power Consumption

    I agree that it could well be a metering problem and recall that some SMETS 2 meters co-exist with Powerwalls better than others. When my SMETS1 meter was replaced by a SMETS 2 meter a couple of years ago I got the installer to double check with his tech support that the meter he was about to...
  10. J

    Cold powerwall

    There's a significant difference between the Powerwall being able to survive a wide temperature range without permanent damage and being able to operate efficiently throughout that temperature range.
  11. J

    PW cuts off the grid connection and goes battery only when the Grid is working fine [New Zealand]

    What is the mains voltage at your house when the PW disconnects from the grid? The voltage drop on the supply will increase as the total load increases and I would assume that the PW is programmed to switch to battery when the mains voltage drops excessively in order to protect household...
  12. J

    Powerwall Solar Generation always lower than Solar Company App

    I've also noticed that solaredge reports higher generation than either Tesla or a kWh meter. I suspect that solaredge is measuring DC power into the inverter and both the kWh meter and Tesla measures AC power out of the inverter. The difference is the inverter conversion loss and, for total...
  13. J

    Tesla: we need more control over our PowerWalls

    I'm due to have a 2nd PW installed next month (ordered last year when TEP was available) which will give me spare storage capacity for half of the year so time-based export will earn me a bit of money (and help the grid). My research suggested that Tesla needed to enable the feature after which...
  14. J

    Tesla: we need more control over our PowerWalls

    My Powerwall (now 5 years old) has progressively behaved much more intelligently as Tesla improved the available features. I reckon it started considering the solar forecast about one year ago although that feature wasn't officially launched until several months later. I suspect that the ability...
  15. J

    Tesla Powerwall II and Octopus Agile

    I'm using time-based control but with the Octopus Go tariff and the rates define clearly that it's financially worthwhile to charge at night using cheap electricity to power the house (with the help of solar power) for the rest of the day when mains electricity is more expensive. I wonder if you...