panel upgrade question

[abirozy]

I am having solar installed shortly and have a question on panel upgrades....We have a Tesla Model S and an R1T and currently are supposed to have two ev outlets installed in the garage when we get our Solar installed (13.1KW system size). Additionally they are doing a panel upgrade to 200 watts.

1). Does that size panel sound like it will be enough to run two chargers, the solar, and my house without problems?


Best

Adam

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[Foobar]

Depends on what you've got going on with the rest of the house. But generally speaking, should be fine. I assume 200 Amps and not watts.

 

[CrazyOne]

Assuming you are upgrading to 200 Amps. Rivian needs 48 amps and 60 amp breaker I believe. If you want to charge both at the same time, it will not be sufficient. There are good solutions for sharing the power between two chargers though. It will be sufficient if your daily commute isn't too long.

If you want to be future proof, get a bigger panel/ 2x 200 amps panels.

 

[abirozy]

Depends on what you've got going on with the rest of the house. But generally speaking, should be fine. I assume 200 Amps and not watts.

Yes. Amps.. Sorry, not that good at electrical. We have a two story, 1950 sq feet., built 1979. Standard things going on, heater, AC, 4 people all using computers, etc... I am not sure if that is enough information.

 

[Foobar]

Yes. Amps.. Sorry, not that good at electrical. We have a two story, 1950 sq feet., built 1979. Standard things going on, heater, AC, 4 people all using computers, etc... I am not sure if that is enough information.

If it's all standard stuff plus maybe a 240 for the dryer a 240 for the oven and you have some spots free in the panel for the additional charger circuits, you should be fine. I have a lot more going on with only a 150 amp.

 

[Marchin_MTB]

We charge two cars on 40A EVSE (larger breaker) that splits the power for two cars when a second car is plugged in (grizzle duo) in other words, it’s a 9.6kW charger for one car and a ~5kW per car with both plugged in. For us, this is more than enough as we generally only use one car and our commute is short. In this case, the 200A service works fine.

 

[supernu8]

200 amp panel is generally good enough and is a good start. You might run into panel loading limits if you try to install two l14-50 outlet circuits depending on what else is in the house.

I would think you have two decent options: a) dual plug charger/load sharing evse setup on a single 60amp circuit or b)hardwire two chargers - one for the riv configured to draw 32-48amps and the other at 30 amps or less to reduce panel loading.
Your electrician should be able to tell you how much extra capacity you have to work with and if one or two circuits is going to be possible.

 

[WSea]

The 200amp panel should have a 220amp bus bar. Should do whole house load calcs.
I think you’d need a bigger panel if 2 vehicles charging simultaneously. Do you really need that? Probably depends on average Miles per day and if you have off peak plan

 

[Christopher]

Your installer should do a load calculation based on your specific situation.

For me, a 3000sqft house, all LED lighting, energy star appliances, I can charge two EVs at 48a and not even come close to using the entire 200a panel. I also have an above average energy consumption in my area not even counting my consumption from the EV chargers.

But in my situation I have a gas dryer, gas stove, gas spa heater, and a gas water heater, so all that consumption is offloaded from my electrical panel. Only large 240v circuits are 4 ton A/C, oven, pool heater, and a pool pump.

If all of those were electric, the story would be different. For example, both cars are charging, pool pump at max RPM with the heater running, water heater running, Thanksgiving day with a turkey and a ham in both ovens, electric cooktop on, and microwave running, A/C running, clothes drying, all the TV's on watching football, then I'd probably trip the main breaker if all my appliances were electric.

It's all about when you're using your appliances. I personally think you'll be more than fine. You can always schedule the vehicles to charge at night when nothing in the house is running, or lower the charge rate since you probably don't need to charge 0-100% every night.

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