Upsizing breaker to a subpanel

[maximus96]

Recently I had a solar PV system installed. As part of the install, a new 100Amp subpanel was put inside my garage. Below is the before and after of the PV system in my outside main panel.

Before: 100A breaker to house subpanel and 40A breaker for AC.
After: 100A breaker to house subpanel and 40A breaker to new 100A subpanel with 40A AC breaker and 30A breaker for solar.

My question is, can I swap out the 40A breaker in the main panel to a 100A, upsize the 8 awg wires to 4 awg, and install a new 60A breaker in the new subpanel for a 240v EV charge station?

The new subpanel has a 125A bus rating so I should be good with the solar backfeed even with a 100A breaker.

Please advise

 

[Stuff]

4awg is only good for 90 amps. Go to 3awg CU and you should be good for that piece.

Note EV charge station probably warrants upgrading your overall service size.

 

[pgray007]

Any reason you want a 60A EV Charger? If you could get by with less it might save you the trouble. Assuming you’re parked overnight a 30A Charger might fill you up over the course of 6-10 hours while you sleep.

I put in a 48A charger for future proofing, but my BMW i3 can only draw a max 30A and it goes from 5% to 100% in about 5 hours.


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[maximus96]

Any reason you want a 60A EV Charger? If you could get by with less it might save you the trouble. Assuming you’re parked overnight a 30A Charger might fill you up over the course of 6-10 hours while you sleep.

I put in a 48A charger for future proofing, but my BMW i3 can only draw a max 30A and it goes from 5% to 100% in about 5 hours.


Sent from my iPhone using Tapatalk

Right now we have two Volts but only one 240v charger so I need another. The Volts only charge at 16A but I want to future proof if I ever get a Model 3 or something. I agree 60A is overkill for my current and even near future needs.