Search with Wattson

Notifications

Clear all

Joining the Renewable Heating Hub forums is completely free and only takes a minute. By registering you’ll be able to ask questions, join discussions, follow topics you’re interested in, bookmark useful threads and receive notifications when someone replies. Non-registered members also do not have access to our AI features. When choosing your username, please note that it cannot be changed later, so we recommend avoiding brand or product names. Before registering, please take a moment to read the Forum Rules & Terms of Use so we can keep the community helpful, respectful and informative for everyone. Thanks for joining!

Tesla Powerwall charge level.

Toodles · 2024-05-30T16:01:22Z

My installation originally consisted of one 13.5 kW Powerwall and I found that on most days, this would charge up to 100% if supplied with energy for a period sufficient for such a charge. My daily consumption was approximately ~ 11-12 kWh and I used the grid to charge via the Agile rate at night. In the morning, my battery would have charged up to 100% and I would provide what I could via Solar PV. I then had an ASHP fitted along with a DHW system fed from Solar or grid; the Tesla BMS would have detected an increase in usage so when I had a second 13.5 kWh capacity added to my battery and we went into the winter, the 27kWh capacity was frequently used in full (or close to 100%) and again, given sufficient timed access to cheapest Agile time, the BMS would ‘allow’ for a full charge. Now we have a lower energy demand as the ASHP is resting most of the time and the Solar PV is contributing far more, I note that the BMS tends to charge the battery to ~78 - 80% and then diverts all excess to export. I suppose this is the BMS logic deciding that charging to 80% is sufficient for the day to day demand. I know that the Tesla controls do have the means to optimise usage so I assume this charging level is all part of this optimisation process. I suppose I am just one of those users who like to start the day with a full battery - even if I do not need that much energy! Regards, Toodles.

Page 3 / 3 Prev

Energy Storage

Last Post by andy_e 2 years ago

27 Posts

4 Users

7 Reactions

11.6 K Views

RSS

Toodles

(@toodles)

Famed Member Contributor

Joined: 4 years ago

Posts: 3023

Topic starter 06/02/2025 4:21 pm

@andy_e We shall see then… Toodles.

Toodles, heats his home with cold draughts and cooks food with magnets.

ReplyQuote

Gary

(@gary)

Reputable Member Member

Joined: 4 years ago

Posts: 350

06/02/2025 4:59 pm

Posted by: @andy_e

↑

heat pump isn’t connected to the interface, so he will be popping back out to put the heat pump consumer unit on the system…

I translate that as I wired it up incorrectly, hopefully its just a CT clamp placement.

ReplyQuote