Multiple cars

[flodorn]

Love your work cdragon, thanks a lot. Been working with your code for a couple of days setting everything up (RPi3B), got two brandnew TWCs (Firmware 4.5.3 / Model EVW2T32HL) and two Teslas (X and S) on european 3 phases. I noticed everything is working fine if I power only one TWC (got relays to cut them off individually). However, If I power both TWCs I found that the cars don't start/stop charging reliably and index.php doesn't display the multiple TWCs correctly. The fix on index.php is the following:

342                     for($i = 1; $i <= $status[$statusIdx]; $i++) {
343                     $subStatus = explode('~', $status[$statusIdx + $i]);
344                     $twcModelMaxAmps = $subStatus[1];
345                     print("<br /><strong>TWC " . $subStatus[0] . ':</strong> ');

The fix on TWCManager.py is the following:

I replaced this
2141 desiredAmpsOffered = minAmpsToOffer

with the following code:

if(maxAmpsToDivideAmongSlaves < 1):
    desiredAmosOffered = 0
else: desiredAmpsOffered = minAmpsToOffer

Without this line I had the following issue: one car is at home trying to STOP charging (due to solar input), the other car is not at home and not plugged in anywhere. This caused the logic on lines 2064-2074 to set minAmpsToOffer to 6 on the TWC with no car plugged in, which in turn led the logic on line 1818 and 1819 to believe that is should start charging which set
queue_background_task({'cmd':'charge', 'charge':True})
right after the car at home which is plugged in into the second TWC set it to 'false' trying to stop charging.

This of course set startOrStop to 'start' and the API cmd kept trying to start the car at home which was already charging at minAmps and which I was trying to stop.

For now this is working fine. Of course it would be much neater to implement a mapping to know which car is on which TWC to be able to start/stop them induvidually. Or better yet, to use the bytearray to start/stop charging but after reading through the 20 pages of the TWCManager post on TMC, I understand that this may not be possible.