Gateway work with 2 universal wall connector chargers?

[CYBEAST]

A little pre-planning here. I'm getting the PowerShare equip installed soon. If I have them wire up a second bi directional charger in anticipation of the future release of PowerShare on all Tesla vehicles. And plan to get a second Tesla. Can I use 1 gateway with 2 chargers to back feed the house at twice the 11kw? Pretend it was two Cybertrucks connected for this example.

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[CyberGus]

When I asked my installers, they said another WC was fine, but had no idea if two PowerShare vehicles could be supported. I guess nobody ever had two Cybertrucks before lol

 

[UberNoob]

Wild guess here but the UWC should load balance between the two while charging on the same feed line / breaker. For discharging why wouldn’t it be the same. I would imagine if you wanted double the kw 22? you would need the second breaker feed and perhaps gateway supplying the other circuits. One truck supply’s half the load ac, and a few lights, other supply’s load for the water heater dryer and a few more lights etc. who knows maybe the software can be tweaked to work in tandom such as the teslas solar inverters. I have yet to read a gateway manual it may max out at certain amperage thereby limiting you.

 

[CYBEAST]

Wild guess here but the UWC should load balance between the two while charging on the same feed line / breaker. For discharging why wouldn’t it be the same. I would imagine if you wanted double the kw 22? you would need the second breaker feed and perhaps gateway supplying the other circuits. One truck supply’s half the load ac, and a few lights, other supply’s load for the water heater dryer and a few more lights etc. who knows maybe the software can be tweaked to work in tandom such as the teslas solar inverters. I have yet to read a gateway manual it may max out at certain amperage thereby limiting you.

Great advice/ theory. I would be going from a 400 amp meter to two 200 amp span smart panels. So maybe I need two gateways also. Run one and the chargers on each 200 amps.

 

[mongo]

Great advice/ theory. I would be going from a 400 amp meter to two 200 amp span smart panels. So maybe I need two gateways also. Run one and the chargers on each 200 amps.

Yeah, Gateway is only 200A, so you would need two for full backup (well, 11.5kW per panel). Unless you can move critical loads to one panel.

 

[darrenf]

Unfortunately, no. The gateway communicates with one UWC over a 4-wire communication cable (like the one that gen 2 HPWCs used to load share) but inter-UWC communication is now done over WiFi and they can't be connected to the gateway in series.

Additionally, in my testing I couldn't have two UWCs doing load sharing over WiFi and connect one of them to the gateway with a 4-wire communication cable. Only after I separated the UWC load sharing group would the hard wired one communicate reliably with the gateway.

You could, as you ask, run two gateways -- each one connected to its own UWC/Cybertruck, but they would back up separate circuits.

-darren

 

[CYBEAST]

Unfortunately, no. The gateway communicates with one UWC over a 4-wire communication cable (like the one that gen 2 HPWCs used to load share) but inter-UWC communication is now done over WiFi and they can't be connected to the gateway in series.

Additionally, in my testing I couldn't have two UWCs doing load sharing over WiFi and connect one of them to the gateway with a 4-wire communication cable. Only after I separated the UWC load sharing group would the hard wired one communicate reliably with the gateway.

-darren

Ok darn. Well I could do this much cheaper by just puttying the gateway next to one of my meters and running the wire to the charger like 150 ft to my detached garage. Anyone know if this distance is possible and what wire size would be needed? Maybe go down one size for voltage drop with that far of run?

 

[darrenf]

I think that the pre-made control cable that ships with the gateway is at least 150ft.

 

[igs]

Unfortunately, no. The gateway communicates with one UWC over a 4-wire communication cable (like the one that gen 2 HPWCs used to load share) but inter-UWC communication is now done over WiFi and they can't be connected to the gateway in series.

I think the OP means connecting them in parallel. Connecting them in series results in 480V which wouldn't make sense.

 

[darrenf]

I think the OP means connecting them in parallel. Connecting them in series results in 480V which wouldn't make sense.

I was referring to connecting the communication cable in series (G3V->UWC->UWC). Sorry for the confusion.

 

[cgladue]

Unfortunately, no. The gateway communicates with one UWC over a 4-wire communication cable (like the one that gen 2 HPWCs used to load share) but inter-UWC communication is now done over WiFi and they can't be connected to the gateway in series.

Additionally, in my testing I couldn't have two UWCs doing load sharing over WiFi and connect one of them to the gateway with a 4-wire communication cable. Only after I separated the UWC load sharing group would the hard wired one communicate reliably with the gateway.

You could, as you ask, run two gateways -- each one connected to its own UWC/Cybertruck, but they would back up separate circuits.

-darren

my installer is going to be installing my 2 UWC with load sharing over Wifi and the "Leader" wired to the Gateway so they will load share on my 80 amp circuit and the leader will power the whole home.

 

[darrenf]

my installer is going to be installing my 2 UWC with load sharing over Wifi and the "Leader" wired to the Gateway so they will load share on my 80 amp circuit and the leader will power the whole home.

Let me know if you get this to work. In my case, when the 2 UWCs were placed in a load sharing group together (and the Leader was the one wired to the Gateway, as you describe), the Leader UWC would not communicate reliably with the gateway. In Tesla One, it showed up occasionally for a few seconds but would then disappear. Once I broke up the load sharing group, it communicated perfectly with the gateway. It's possible that the two weren't related -- I was making other changes the same day -- but they were correlated in time.

FYI (since I had to find this out the hard way), code requires that the EVPE (the UWC connected to the Cybertruck and the Gateway) has its own disconnect to allow first responders to deenergize the rest of the home. If you have a sub-panel between the shared power run and your two UWCs then you're fine but if you have power running to one UWC and then the next with no intervening disconnect, plan to add a small sub-panel. You have to be able to isolate the EVPE from every load in the house, including your other UWC (the EVSE).

-darren

 

[cgladue]

Let me know if you get this to work. In my case, when the 2 UWCs were placed in a load sharing group together (and the Leader was the one wired to the Gateway, as you describe), the Leader UWC would not communicate reliably with the gateway. In Tesla One, it showed up occasionally for a few seconds but would then disappear. Once I broke up the load sharing group, it communicated perfectly with the gateway. It's possible that the two weren't related -- I was making other changes the same day -- but they were correlated in time.

FYI (since I had to find this out the hard way), code requires that the EVPE (the UWC connected to the Cybertruck and the Gateway) has its own disconnect to allow first responders to deenergize the rest of the home. If you have a sub-panel between the shared power run and your two UWCs then you're fine but if you have power running to one UWC and then the next with no intervening disconnect, plan to add a small sub-panel. You have to be able to isolate the EVPE from every load in the house, including your other UWC (the EVSE).

-darren

I have a 200 amp main panel. Off that is a 100 amp subpanel in the garage. Off that is an 80 amp circuit that runs to the leader and then continues on to the follower. My installer didn't say anything about a disconnect between the leader and the follower. I assume the 100 amp breaker in the main panel would act as the disconnect for the whole home ?

 

[darrenf]

I have a 200 amp main panel. Off that is a 100 amp subpanel in the garage. Off that is an 80 amp circuit that runs to the leader and then continues on to the follower. My installer didn't say anything about a disconnect between the leader and the follower. I assume the 100 amp breaker in the main panel would act as the disconnect for the whole home ?

I know that code is different, and can be interpreted differently, between jurisdictions, so go with your installer's advice.

My setup was like yours. I had to make two changes. First, I had to replace my disconnect with a small subpanel so that the EVPE can be disconnected from all loads (the other EVSE being one of those loads). Second, since I was now using a load center instead of a disconnect, I had to pull a neutral to the new subpanel since all load centers need to have a neutral.

This worked out OK because ultimately I wasn't able to get WiFi load sharing between the two UWCs working alongside the required communication between the EVPE and Gateway, so I pulled new wire that could handle charging both simultaneously at full tilt.

[So that readers don't have to look up acronyms, EVPE is Electric Vehicle Power Export Equipment -- the Cybertruck's UWC when back-feeding power, and EVSE is Electric Vehicle Supply Equipment which is a UWC while charging the vehicle. I'm using EVPE here to distinguish the UWC that the Cybertruck is connected to.]

 

[CYBRTRK-ME]

my installer is going to be installing my 2 UWC with load sharing over Wifi and the "Leader" wired to the Gateway so they will load share on my 80 amp circuit and the leader will power the whole home.

Wondering if you got this working (2 UWC's with the Gateway sharing one circuit)? I attempted today to do just that and got the same results that @darrenf did (the Gateway would not reliably talk with the leader UWC). I ended up removing group power management and splitting the 60A load on both UWC's (one set to a "40A breaker" and the other to a "20A breaker"). This allows the Gateway to at least talk again to the one UWC that will backup the house (and use both UWC at the same time - albeit in a limited capacity). Tesla support also mentioned today that the software does not exist (yet) for PowerShare gateway 3V and UWC Group Power Management to work together (which explains why @darrenf and I were seeing the same thing)

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