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Setup Examples -- Photo Gallery

A. SINGLE TFI-100 SET-UP: 

Automatic Switch for two AC loads --> Dryer and EV charger (~240VAC, 24A)

1. Installation:

    Confirm that the 240VAC wall outlet is working OK with the electric dryer.

    Find a location near (within reach of the 4ft-cable's length) the 240VAC wall outlet.

    Mount the EV-Switch device using the provided 4 mounting tabs and screws (to studs inside the wall).

2. Connections : make the following 3 cable connections

Dr port (left): Electric Dryer , EV port (right) : EVSE / EV charger , Cable (bottom): Wall outlet

Caution : Make sure the NEMA plugs fit snugly and completely into the receptacles without any visible gap between them. 

Proceed to use the electric dryer and perform EV charging task normally (at 24A).

B. TFI-20X AND TFI-10X IN CASCADE :

For three AC loads --> Dryer and two EV chargers (~240VAC, 24A)

1. Installation:

Confirm that the 240VAC wall outlet is working OK with the electric dryer.

Find 2 locations near (within reach of the 4ft-cable's length) the 240VAC wall outlet.

Mount the EV-Switch devices as shown in above picture using provided hardware. (Make sure the screws go through studs inside the wall).

2. Connections : make the following cable connections

At TFI-20x (on left side, with switch) -  Dr port : Electric Dryer, EV port : TFI-10x cable, Cable : Wall outlet

At TFI-10x (on right side, without switch) - Dr port : EVSE / EV charger, EV port : open or Another EVSE / EV charger, Cable : EV port of TFI-20x

Caution : Make sure the NEMA plugs fit snugly and completely into the receptacles without any visible gap between them. 

3. Operation and Scheduling:

For the TFI-10x / EV-Switch tm, load time-sharing operation with two EVSE/EV chargers can be either "free run" or "conflict-free".

3.1 "Free run" means connection of two EVSE/EV chargers to both Dr and EV ports then start both EV chargers. The TFI-10x / EV-Switch tm will prioritize the charging of Dr side first then switch to EV side after Dr side is done. Thus the car with less charging need should be connected to the Dr side.

During operation, the User is cautioned that :

1. When ambient temperature is > 113F (45C) +/- 3.6F (2C) during a charging session with 24A at EV side, the TFI-10x/EV-Switch tm may enter a safety thermal shutdown for ~60 minutes before resuming operation. ( Note: The use of a lower (e.g., 23A) charging current can mitigate the safety thermal shutdown at ambient temperatures > 113F (45C) ).

2. The AC meter is not specified to operate under 32F (0C).

3. The standard TFI-10x / EV-Switch tm is not specified to operate under -4F (-20C). (Consult the factory for -40F (-40C) rated custom products).

4.  Most EVs, e.g. Tesla cars, can be set up to automatically turn on the air conditioner when the cabin temperature is > ~105F (40C).

5. The self-diagnostic LED at Dr side needs to flash to indicate the microcomputer is OK. Do not operate the box when this LED is not flashing. Contact the factory.

The User should observe the temperature specifications when charging their EVs.

In addition, when condition #4 (see above) occurs after the car connected to Dr side is fully charged, the car may initiate further charging. The EV side might thus be de-activated and re-activated several times during a [long] charging session. The repeated (> 3 times) interruptions at the EV side may cause some car charging controller(s), e.g. Tesla 's, to enter a fault condition that requires User 's intervention (e.g., unplug then re-plug the charging cable at the EV side).

The User should, therefore, take precaution(s) to avoid or limit repeated AC power input interruptions at EV side during the charging session OR to use the below-described "conflict-free" approach.

3.2 For "conflict-free" load time-sharing operation, the EV charging at TFI-10x Dr port (left) and at EV port (right) is set up / scheduled to be non-overlapping. This scheduling precludes any chance of repeated charging.

Example:  Overnight 12-hour charging session from 8PM to 8AM (of next day) of 2 EVs:

a.  The EVSE / EV charger on TFI-10x Dr port (left) can be set active from 8PM to 1:59AM. After 1:59AM, the EV charging at Dr port is turned off.

b.  The EVSE / EV charger on TFI-10x EV port (right) can be set active from 2AM to 7:59AM. After 7:59AM, the EV charging at EV port is turned off.

For Tesla vehicles, one implementation can be :

a. Connect the Tesla Mobile Unit of 1st car to the EV port and set the Scheduled Charging time at 1st car to 8:00PM. Make sure the charging cable is connected to car 's charging port before 8:00PM.

b. Connect the Tesla Mobile Unit of 2nd car to the Dr port and set the Scheduled Charging time at 2nd car to 2:00AM. Plug the charging cable to car 's charging port.

The 1st car will charge from 8:00PM to 1:59:59AM, then the 2nd car will charge from 2:00AM until done or stopped by the User the next morning. (Note that the 2nd car will start charging at 2:00AM regardless of whether the 1st car is fully charged or not. Therefore, it may be better when the car with less charging need is the 1st car that is connected to the EV side.).

Notes:

1. The User is free to adjust the charging periods (6 hrs + 6 hrs or 4hrs + 8 hrs etc.) but should be mindful that the charging at one port does not overlap the other.

2. The TFI-10x will prevent any scheduling conflict from becoming an overload condition and favor the Dr port, i.e., let the Dr side charge first.