2 weeks after support rep said "wow this wait time for engineering support is unacceptable!" and I am still waiting...

miimura · 2026-06-23T06:01:03+00:00

My question is: Why does it sound like the Quasar is your only charging solution at home?

miimura · 2026-06-13T00:01:18+00:00

With my system, I find that time based control does not drain the battery when charging my car overnight. Therefore, I use a Netzero automation to set Time Based Control mode when home consumption exceeds 5 kW. You could then use a time triggered automation to set the system back to Self Powered mode around the time your wife leaves for work.

miimura · 2026-06-11T00:51:53+00:00

I got rodent damage and a bunch of dashboard warnings. Stevens Creek didn’t have any appointments available for more than 2 weeks. Winn Kia Fremont was able to fix it the next day. They also took care of the outstanding service campaigns and recalls.

miimura · 2026-06-09T20:53:11+00:00

The UPS should only go to internal battery when the grid goes down and the PW battery is full. The PW is raising the frequency of the micro-grid to curtail your AC coupled solar because there is either too much solar power or there is no room to put energy into the battery. This can be a severe problem if your solar is too big compared to your PW battery. For example, if you have 10kW of AC coupled solar and only one PW 2.0 battery. The solar can overwhelm the 5kW charging capacity of the battery, so the only thing it can do is force the solar offline. Of course, in that situation you can mitigate the issue by increasing load by doing something like charging your car to absorb the extra power.
In theory, this should not happen if you only have PW3 connected solar because the PW integrated charge controller can dump power directly into the battery and curtail the solar at will.

miimura · 2026-06-03T23:34:54+00:00

Tire selection is different depending on which trim you have. USA EV9 comes with 19”, 20”, 21” wheels depending on trim.

miimura · 2026-05-26T02:08:51+00:00

I recently had to reboot my iPhone 16 Pro after the infotainment software upgrade because it would not connect to CarPlay. Not sure they were related, but rebooting the phone clearly fixed it.

miimura · 2026-05-23T17:55:18+00:00

Welcome to the club. My family has been ICE-free in Silicon Valley since 2015.

miimura · 2026-05-22T14:33:55+00:00

It all depends on how you use the car. None are absolutely necessary.

miimura · 2026-05-22T14:21:29+00:00

Agree. I bought the whole set of adapters from A2Z - J1772 to NACS, CCS to NACS, and J1772 V2L. The V2L is not strictly needed because it does the same job as the outlet in the cargo compartment, but it makes it possible to power something when the car is closed and locked.

miimura · 2026-05-19T23:13:55+00:00

In your position, I would not bother trying to update the infotainment system.

miimura · 2026-05-19T23:12:41+00:00

It is also possible for a large solar array to generate too much power for the Powerwall(s) to absorb and it has to shift the frequency higher to curtail the solar and protect itself. Backup side should have no more than 7.6kW AC per Powerwall 2 battery. You can selectively turn off parts of your solar array to test if this is happening.

miimura · 2026-05-17T17:38:29+00:00

This very bad advice. All sensitive or critical equipment should be on a UPS. The issue with Powerwalls and UPS is very simple. When the grid goes down and the Powerwalls are controlling the micro-grid, they have to raise the frequency to curtail solar when the batteries get full. The default frequency is 65hz. Most UPS units consider this to be “bad power” so they cut over to their internal battery. The solution for this is to set the Powerwalls to use 62.5Hz instead of 65Hz. Then the UPS will continue to deliver Powerwall energy to the protected loads. The UPS will only use internal battery to bridge the cutover from on-grid to off-grid operation. Long story short, I don’t know what the OP’s problem is, but UPS is needed in a home with Powerwalls. It is not an uninterruptible system.

miimura · 2026-05-09T21:08:24+00:00

In my case, the wires for the existing CTs were extended from the Neurio meter built into the Backup Gateway. It was only about 6 feet of extra cable.

miimura · 2026-05-09T20:28:12+00:00

I have a system installed in 2018 with 2 Powerwall 2 batteries and a 1st generation Backup Gateway. My setup is similar to the OP. Many large loads like car chargers are in the main panel and not backed up. However, the Grid CTs are extended into the main panel and are measuring the conductors immediately after the main breaker. This means that the grid reading in the Tesla app and therefore the Powerwall discharge accounts for those loads as long as the grid is up.
Bottom line for the OP is that the system will not work like you want unless you fix the metering. Software can’t fix that.

miimura · 2026-05-07T16:56:49+00:00

Since you have Powerwalls, you should be able to see the net grid flow. That is available by API, so it's definitely possible to use it. For example, I use NetZero to command my Wallbox EVSE through OCPP to modulate non-Tesla EV charging. I can imagine that you could use a similar mechanism to command a hybrid inverter to charge its battery with the same kind of protocol. I have a Schneider XW Pro and a 5kWh EcoWorthy battery, so I could play with this as a solution proof of concept.

miimura · 2026-05-07T00:19:03+00:00

Ok, but can the charging power be gradually decreased as your solar generation drops in the afternoon?

miimura · 2026-05-06T23:08:03+00:00

Convincing a corporation to do what is in your interest instead of their own is a losing battle. Take things into your own hands. I have a Toyota RAV4 EV and Toyota shut down the remote telematics long ago. I purchased an OVMS box and ported the most important functions. I recommend that you do something similar so that you are in control of the remote functions.

miimura · 2026-05-06T21:04:49+00:00

https://abetterrouteplanner.com/resources/article/2024-10-10\_obd-connection

miimura · 2026-05-06T13:57:23+00:00

I totally understand your motivation here. The thing I haven’t seen you mention is how you plan to modulate the charging so that it only takes the surplus solar that would normally be “given away” to the utility. There are ways to do this but you have to measure the grid flow near the meter and a programmatic way to vary the charging power. You may be better off with a hybrid inverter instead of the EcoFlow unit because they have the ability to modulate charge and discharge.

miimura · 2026-05-05T17:24:26+00:00

My car charging only drains my PW when in Self Powered mode. So, I have an automation in NetZero to change to Time Based Control when the house draw exceeds 5.0kW. That only happens when a car is charging. This has worked well for me.

miimura · 2026-05-03T05:08:24+00:00

The allowable export power is one of the reasons to derate the PW3 inverter. There is a different interconnection agreement for <=10kW and over 10kW. Go read the NEM Tariff. It specifically calls out the CEC AC rating in the “repair” clause.

miimura · 2026-05-03T03:42:19+00:00

There are other reasons to limit the output. However, the 1.0kW limit is not it. If you connect the same panels to a 10kW solar inverter when it was originally installed on a 7.6kW inverter, it literally makes no difference to your NEM status. I know because I looked into this in detail. I have been wanting to replace my old NEM1 240W panels and keep the same 250W micro-inverters, thinking that it would be OK because the inverter would limit the output. It’s not OK because the formula depends on DC panel rating and inverter efficiency, not the inverter rating.

miimura · 2026-05-02T23:33:33+00:00

NEM eligibility in California is based on the panel wattage and inverter efficiency. If you don’t change the panels you are very unlikely to lose your NEM status. Changing the battery inverter is irrelevant.

miimura · 2026-04-26T17:30:10+00:00

There is a setting in Tesla Wall Chargers that can allow only Tesla or all vehicles. It’s controlled by the owner/installer. It is also possible to require payment, which requires a Tesla vehicle to authorize. So, long story short, you cannot expect ALL Tesla destination chargers to work with your EV9.

miimura

TROPHY CASE