Looks like Tesla have put in a new ‘feature’ whereby an 'unexpected voltage drop" then causes reduced charging rate for the rest of the charge duration… regardless if the voltage returns to normal or not…
I like a lot of people have a large solar array and these sorts of voltage changes occur regularly on partly cloudy days as the array goes from full sun to full shade…
Unfortunately ChargeHQ/Tesla does not seem to be able to ramp back up to a full rate of Charge unless i manually start/stop through the app.
Is this something that can be added to a future release please? Ie: If the expected Charge Amps are below ‘X’ for 5 minutes stop and then start the Charge Session? (Or open to smarter ways too if that’s possible!)
Screenshot below - Thanks very much.
I’m not sure if it’s possible for Charge HQ to do anything about this issue, as the Tesla API does not provide any information about this situation. Charge HQ can not reliably detect that the charge rate has been reduced due to voltage changes. I’ll ask Tesla about it.
I’m also not sure if it’s a good idea for Charge HQ to try to increase the charging rate in this situation. The vehicle has decided to reduce the charge rate for some safety-related reason. I don’t know the exact logic behind this mechanism nor the details of the electrical considerations, and would be reluctant to try to circumvent it.
The issue does get reported anecdotally every so often, but we don’t have data on how frequent it is. If Tesla adds something to the API we’ll be able to track it.
In principle this is really an issue that Tesla should be addressing directly, rather than third-party apps trying to work around it. But I’m open to digging into it a bit further. Cheers.
Thank you for the response jbanyer. yes i agree it probably should be fixed on Tesla’s side. I believe it is a relatively new addition as last summer it didnt happen - and in winter you dont see the problem as solar array doesn’t cause the large voltage doesnt fluctuations… Would be great if you could discuss with Telsa.
Realistically if the voltage is stable for a period after the charge rate has been dropped then it should be ok to ramp up again.
or at the VERY least Telsa App should notify via the phone app that the issue has occurred. Currently you need to open the App to see the error.
I have setup HomeAssistant to send me an email to notify me though far from ideal.
Tough one Sage222 as you have a 10kW inverter with a rare 10kW export limit. You’re also at the Eno of the street with a fair bit of solar. This is a worst case for voltage fluctuations. Try the smart solar feature with dynamic ramping to your solar output (without Smart meter add a buffer)
This may help
Any more information from Tesla?
guess not… well was worth a shot… will try Tesla as well.
Have you looked at the voltage you are getting from the grid? If the grid is outside +10% or -6% from 230V (216V - 253V), your distributor has to fix it for you.
They may be able to move you to a different phase if on single, or balance other households on other phases.
When I have seen this notification on my Tesla before, the grid voltage at the house I was staying at was shocking - like nearly below 200V. There’s a reason then both Tesla and ChargeHQ do not want to override this as it is unsafe - also for other appliances on your electricity supply.
Just saying it may not be an inverter issue, could be a grid issue your distributor can fix.
thanks for the response. yes monitoring grid voltage when it occurs… i can be sitting at 240v and drop to 225v and the car complains… or even at 260v and drop to 245v… or even 230v down to 215v. As i said above i have a very large solar array that raises the grid voltage considerably… it would appear the Tesla doesnt care about what the voltage is… only that it dropped suddenly… which i said above is expected with a large solar array and clouds.
its all good… have setup monitoring and auto-start stop with HomeAssistant… crap that i have to put in a workaround. though its functional.
