Changing charging amps

[Bushwood CC]

I’m putting in a 30 amp circuit that was from a failed on demand water heater in my garage. It uses 10-2 wire. I want to have a backup for my wall charger. The only way I can see to connect is to put in a dryer outlet and buy an adapter. The adapter says to reduce the amps to 24. I don’t know how to adjust that. Anyone?

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[potato]

Your profile doesn't say what year your truck is. Some models have the ability to adjust the max current from somewhere in the charge settings in the truck. Mine does not. To be safe, you would use an EVSE that will only deliver 24 amps when using a 30 amp plug. That way it's "fail safe" and an incorrect setting in the truck cannot trip your breaker or worse. Truck settings (not sure about that one, but some for sure) are known to get wiped during software updates sometimes, so this is not really a hypothetical situation.

For example my Tesla mobile connector will properly derate to 24 amps when using the 30 amp dongle. Many others can do it too.

There are some that can go higher but allow you to set the max via an app or controls on the EVSE, but those are not "fail safe". An incorrect setup can overheat something.

 

[Maquis]

Buy an EVSE that is adjustable.

 

[Grumpy2]

It uses 10-2 wire.

Are you saying the wire lacks both a neutral and ground?

 

[Heliian]

Are you saying the wire lacks both a neutral and ground?

10-2 would have 2 conductors and a ground.

 

[RLXXI]

10-2 would have 2 conductors and a ground.

Which would work for a 120v connect. @ minimum they would need 10-3 for a 240v connect. 2 lines, neutral and a ground.

 

[garsh]

Which would work for a 120v connect. @ minimum they would need 10-3 for a 240v connect. 2 lines, neutral and a ground.

Most hard-wired EVSEs do not require a neutral. You can use 10-2 to connect those.

There are also several 240v NEMA outlets that do not require a neutral and could be installed with 10-2, such as NEMA 6-30 and NEMA 10-30.

 

[garsh]

I’m putting in a 30 amp circuit that was from a failed on demand water heater in my garage. It uses 10-2 wire. I want to have a backup for my wall charger. The only way I can see to connect is to put in a dryer outlet and buy an adapter. The adapter says to reduce the amps to 24. I don’t know how to adjust that. Anyone?

The best thing to do here is to get an EVSE that can be hard-wired to that circuit. It should allow you to configure the amperage limit. And unlike a plug-in EVSE that uses a NEMA 14-50 plug, it won't require a neutral connection and some risky "adapter" that lets you get around that fact.

 

[RLXXI]

Most hard-wired EVSEs do not require a neutral. You can use 10-2 to connect those.

There are also several NEMA outlets that do not require a neutral and could be installed with 10-2, such as NEMA 6-30 and NEMA 10-30.

Had splitting the 240v into twin 120v
circuits on the brain.

 

[Mal106]

I'm sure you have looked in the App in the charging section. My '25 Flash can adjust the charging amps there.

 

[chl]

I’m putting in a 30 amp circuit that was from a failed on demand water heater in my garage. It uses 10-2 wire. I want to have a backup for my wall charger. The only way I can see to connect is to put in a dryer outlet and buy an adapter. The adapter says to reduce the amps to 24. I don’t know how to adjust that. Anyone?

Your best bet might be to upgrade to a 40A breaker and number 8AWG wire, then you can use a 240V 30A or 32A EVSE, like the Ford Mobile Power Cord if you want a plug-in set-up.

If you go higher than a 40A circuit you need to hard wire it.

Although I hardwired my Ford Charge Station Pro EVSE for a max 80A, I ended up buying an SR Pro Lightning which could only use 48A due to the on-board charger limit, and in reality, all I really need is 32A to meet my daily requirements and charge when the utility rates are lowest (1am - 5am).

I can adjust the MAX current with the FCSP either by an on-circuit-board current dial, or with the FORD app.
Other EVSE may have that ability as well.

Figure out what you really need for a charge rate on a daily basis and then invest the money in wiring and an EVSE that can handle it.

 

[K6CCC]

I'm sure you have looked in the App in the charging section. My '25 Flash caan adjust the charging amps there.

That's only on the 25 model year.

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