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I have the power! 40A home charger finally installed!

1.9K views 16 replies 9 participants last post by  GregBrew  
#1 ·
I got my 40A Enphase IQ50 NACS charger installed this week! That night, getting home from work, the car was 11%. I charged overnight to 100%, and started the next day with a full battery and whole new outlook on EV life. :)

I picked the Enphase charger because my home solar system uses Enphase micro inverters. I wanted the charger to integrate into the Enphase app to facilitate my six years and counting of logging solar and electrical use and costs. The downside is I paid 48A pricing for a 40A charger. (Otherwise, I would have gotten an Emporia 48A charger.)

A simple and optimistic estimate is that 10k miles at 4 mi/kwh is 2500 kWh to charge over the year. I have 2500 kWh surplus from last year’s solar. So my solar could cover my Ioniq 5 charging 100%. Life is never that simple nor so optimistic. But my solar should and hopefully provide me free charging for a majority of my driving. I’m looking forward to finding out.

 
#6 · (Edited)
It looks good! If you have no other way to easily shut off power to the charger (like a nearby subpanel) I suggest you replace your junction box with a disconnect switch; something like this:

It’s an easy job for any electrician.
It’s on its own circuit breaker, just throw the breaker if things were really really wrong.
 
#8 ·
In hindsight we did many things backwards of what I would do if I were starting today. We started with 3.3 kWp of solar in 2016 and added a heat pump and Ioniq 5 in 2022. Mixing our existing Solar Edge inverter and a Chargepoint EVSE did not provide the integration benefits of your system. However, I knew we had something like 1,500 kWh of surplus electric generation annually prior to the heat pump and EV. I made a rough estimate of the increased electric use from the heat pump and EV and we added another 2.0 kW of solar capacity in 2023. After the first full year with the heat pump, EV and new solar capacity in place I was very happy to see that our current solar generation and electric consumption are closely matched with only 100-200 kWh of excess solar annually.
We're not too concerned about detailed costs versus savings. Saving money wasn't our primary motivation. Any longterm $ savings are certainly a bonus.
 
#16 ·
typical breakers have a mechanical switching life of 10,000 operations. in 10 years, i might use it 500 times. i fully understand about design criteria. my garage wall looks like a lab with subpanel, transfer switch and evse, so i really don't want to add another switch that's not an absolute requirement.