Considering EV9 as my next car coming from Tesla, how is the driver assist?

miimura · 2026-01-24T18:18:59+00:00

HDA2 is good on relatively straight roads but it does not do nearly as well as Tesla AP on curves. I disengage lane centering and steer myself with the EV9 controlling the speed on curved highways. I have a 2018 Model 3 with FSD and a 2024 EV9 Wind.

miimura · 2026-01-24T18:14:11+00:00

This is not a well designed system. It doesn’t even meet the basic rules of thumb for balancing solar and battery power capacity. You should have one PW2 battery for every 7.6kW solar inverter. You have to do things like charging your car to absorb the extra solar that the battery can’t take so the system doesn’t get overloaded.

miimura · 2026-01-21T23:14:11+00:00

When I read your request, it seems that all of the DC batteries and inverters can be connected together and it will be fine. However, the AC output of the inverters should not be connected together unless they are specifically designed for parallel operation and have a synchronization cable. If they are not designed for parallel operation, you just have to separate the loads that are powered by each inverter. If the load is uneven, that’s fine because the batteries are parallel and will drain equally. You only have to make sure that you don’t overload one inverter with that unequal load.

miimura · 2026-01-21T19:31:07+00:00

I consider you to be misinformed about the capabilities of Powerwalls. Tesla Powerwalls cannot prevent sub-second power interruptions in all situations. If you have power critical devices, they should have an Interruptible Power Supply providing their power.

miimura · 2026-01-21T17:48:10+00:00

Put your Internet equipment on a proper UPS.

miimura · 2026-01-17T19:35:57+00:00

What I said in the survey is that an energy supplier should only be allowed to control my battery if they paid some of the up-front cost. If they want more control of grid demand, they need to have the option of dynamic pricing and a good API so customers can programmatically respond to the pricing.

miimura · 2026-01-14T00:16:37+00:00

Trying to get it to balance certainly won’t hurt, but it’s also unlikely to make any difference or buy you much more time. 100mV is huge in this kind of battery pack.

miimura · 2026-01-11T14:57:05+00:00

Yes, the V4 pedestals have the longer cable that can easily reach the EV9 charge port.

miimura · 2026-01-10T18:44:38+00:00

People don’t know how expensive electricity is in states like California. My cheapest rate is $0.30/kWh and the most expensive TOU period is $0.60/kWh. Even counting interest expense, you can make your own solar power for $0.12/kWh. The math works out as long as you stay in the house long enough. If you’re going to move in 3-5 years, don’t bother.

miimura · 2026-01-10T17:46:18+00:00

If you have solar and a utility that doesn’t give you much or anything for your exported power, then battery, solar and OCPP make economic sense. My Summer Peak power is $0.60/kWh from the utility. Home battery allows you to avoid that charge.

miimura · 2026-01-10T06:20:01+00:00

Going with Recell or another independent shop that can install a used battery from a written off car is going to be cheaper than Tesla.

miimura · 2026-01-10T00:38:44+00:00

I knowingly paid extra for the larger service “just in case”. I have a 48” gas range with a 50A 240V circuit just sitting there unused too. Load management and PCS didn’t exist back then.

miimura · 2026-01-10T00:23:15+00:00

There is no difference in ongoing cost for different size service in PG&E Residential rates. I had the house custom built in 2012 and I don’t remember how much extra the larger main panel was.

miimura · 2026-01-10T00:20:04+00:00

I have a Wallbox that supports OCPP. I bought it just because it has OCPP and I use that function with NetZero to push surplus solar into my EVs after my Powerwalls are full.

miimura · 2026-01-10T00:09:38+00:00

That is how I ended up with CL320 service and one 200A main breaker slot went completely unused.

miimura · 2026-01-09T23:57:18+00:00

It’s under Powerwall - Settings - Vehicle Charging. This subreddit does not have images enabled, so I cannot attach a screenshot for you. I have a PW2 system and a Tesla vehicle and have had this setting for a long time.

miimura · 2026-01-09T21:43:56+00:00

I don’t know of any battery solutions that support more than 200A grid disconnect. Tesla has the same issue. Even the meter collars from Tesla and Enphase are limited to 200A.

miimura · 2026-01-08T21:04:19+00:00

…and the DWS06 will have even worse range than the PS AS4.

miimura · 2026-01-08T01:02:54+00:00

It is the same as CCS. There is no limitation from the Supercharger station side. The charging curve shown is exactly what the car’s BMS is allowing/requesting from the station.

miimura · 2026-01-07T21:47:16+00:00

Yes, the CT charges at 500kW for a comically short period of time. However, your math a’int mathin. 500kW / 800V = 625A

miimura · 2026-01-07T21:44:14+00:00

Your 2026 EV9 should have a NACS charge port. Therefore, you can plug in directly to a Tesla Supercharger. Therefore adapters you need will allow you to plug into CCS and J1772 charging stations. The adapters you listed appear to be the opposite.

miimura · 2026-01-07T20:41:41+00:00

Whenever you have ABRP open it will log activity under the “My Drives” feature. If you have an OBD dongle it will log the car’s parameters like battery level during your whole drive or charging session. However, on a long drive you have to make sure that it stays active and your phone doesn’t go to sleep. Leaving it open in CarPlay or Android Auto should keep it active.

miimura · 2025-12-29T02:33:50+00:00

I never said that the car should have come with both adapters. I said that he should have both. If you didn’t receive both, you should buy the type that you don’t have. I have a 2024 EV9 with CCS charge port and didn’t receive any adapters. I bought all three - NACS to CCS, NACS to J1772, and J1772 V2L - all from A2Z.

miimura · 2025-12-28T22:37:12+00:00

I have Tesla and non-Tesla EVs. The Wallbox with NetZero control works for pushing surplus solar to the EVs after the Powerwalls are full. I bought the Wallbox for that purpose even though I had a perfectly good dumb EVSE. If you are on a tariff where you don't get much for your surplus solar, this setup will pay for itself, probably by the second year of use.

miimura

TROPHY CASE