I have tested many EVs and they dynamically adjust charge rate if you alter the pilot dynamically. You can go from 6A up to whatever your maximum is at 1A increments this way. Obviously a typical on-the-shelf EVSE does not have a provision for this, but it's pretty easy to start with an OpenEVSE and add in some code smarts. The only down side is there is no feedback, so you don't really have any good way to determine the SoC of the EV.
Tesla also has an API that lets you start/stop and adjust charge amps, so it can be done completely by software on a Tesla, this is the path I have played with. For example, if I have excess production, which is usually the case in the mornings/mid-day, I can command the car to start charging and dynamically set the amps to match the excess. The API is also great because you can see the SoC, so for instance if I detect the car doesn't have enough charge for the next day, I can come in with off-peak charging overnight to hit that target, etc. These days I mostly work from home, so not much use for a "smart" EV charge system, but definitely could be of benefit for others that have predictable commute schedules, etc. On Fri, May 9, 2025 at 8:34 AM jim--- via EV <[email protected]> wrote: > You need to better describe your system and goals. Is this grid tied or > stand alone? You imply that it has a battery - true? > > What are you trying to accomplish, and what interaction are you expecting > between the two high power loads you mentioned and the PV system? I would > certainly not expect any smarts on the part of the toaster over - it's > simply going to expect a steady supply of 120 volt AC power at whatever > current it is drawing. Likely the same with the EVSE - except I assume it > is expecting 240 volts. > > Jim > > > > -----Original Message----- > From: "Ron Solberg via EV" <[email protected]> > Sent: Friday, May 9, 2025 08:07 > To: [email protected] > Cc: [email protected] > Subject: [EVDL] PV/EV Load > > Hi, > > This is about the interactions and components of a presently working > OutBack 3K PV system mounted on the roof of our home. As we search for > ways to manage the load for the system we are curious as to what AC > loads we can use. Here are two examples that have raised questions: 1.) > Grizzly 8Kw EVSE 2.) Cuisinart toaster oven > > We have charged EVs here at J&R housing since 2010 with no problems > using ClipperCreek EVSE as a service and for our 2018 Tesla. Recently we > installed an OutBack 3 Kw PV system and then a 8 Kw Grizzly EVSE as a > load to charge our 2018 Tesla. The system works, but the Grizzly system > does not interact with the OutBack system in a convenient way. As an > aside, we derated the 48A to 24A with a 30A breaker. We are pleasantly > surprised that a 5A feed setting adds up as clouds come and go to manage > power through the OutBack PV/Grid/48V battery system. It all works well. > > > The system works. My question is about convenience, sharing and > curiosity. The folks at Grizzly could not help me and I did not contact > OutBack but I am guessing that the electronics of the two systems > conflict in such a way that I have to manually use the Grizzly by > switching it at the breaker and or on occasion (briefly)add as needed, a > heater load to the OutBack service to get the Grizzly to function as I > watch its status by a series of displayed colored lights. I wonder about > the PV controller/48V battery/sun-cloud feed to the inverter. > > The electronics of the Cuisinart Toaster Oven also raises questions > about the OutBack AC output. Spikes/more data/forget it? Good old DC > loads? > > As a retired physics teacher who understands much of the electricity of > Classical Physics and wonders about the uncertainty and relativity of > Modern Physics, I cannot help but wonder if the issue I have encountered > with my EV/PV/EVSE is of interested to anyone or has a practical > solution. Since I took advantage of their sale price I have a second > Grizzly unit to swap out but I was not encouraged to do that by the > Grizzly engineers. > > Thanks, > > Ron Solberg > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20250509/f8591f1c/attachment.htm > > > _______________________________________________ > Address messages to [email protected] > No other addresses in TO and CC fields > HELP: http://www.evdl.org/help/ > > > > _______________________________________________ > Address messages to [email protected] > No other addresses in TO and CC fields > HELP: http://www.evdl.org/help/ > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20250509/ebc8df7d/attachment.htm> _______________________________________________ Address messages to [email protected] No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
