Odd E.V. home charger question

[Julie.]

Hey Julie, My car battery is 65w, at 40 amp takes my car about 6 hours to charge from very low miles to full, How much in your opinion should it cost me for a full charge. My numbers say about 9 dollars. My Emporia app that is set to the correct rate shows just under that amount.

I think you mean 65kWhr , but at 80% efficiency

65/.8 = 81.25kWhr

81.25kWhr x 0.13 usd = 10.56 usd

If the charger is 100% efficient

65kWhr x 0.13 usd = 8.45 usd

So somewhere between 8.45 and 10.56 usd depending upon the exact efficiency of your in-car charger and the state of charge.

(9usd would give an efficiency of circ 94% if there was no residual charge left in the battery prior to charging)

 

[Inovermyshould]

Here again my bill, average $30 a month all year round, using the charger 4 times total month was $128. Keeping the charger powered but no car charging was $48 for the month. loosely you could say it cost me $70 for the four charging times about $17 per charge. That is what I am trying to figure out. My Emporia charger should not drain all of the energy. Monday I will call my electrician, they might be able to measure it. Even if they do I will still have those high bills.

 

[Inovermyshould]

Is this a stupid question? is it possible that I am have EV charging drain because I am using a fuse box with 50 amp fuses?

 

[mainline]

Is this a stupid question? is it possible that I am have EV charging drain because I am using a fuse box with 50 amp fuses?

No

 

[Moley]

A bigger fuse doesn't 'push' more current through. The charger will only draw what it needs. If it was 100 amp fuse it would still draw the same current as it is now.

 

[Inovermyshould]

How about the amp default setting of 40amp, wonder if I lowered to 32 amps would make a difference.

 

[Avo Mk8]

My power company rates are 13.2 cents killowatt

Are you sure this is your rate?
Your profile suggests you are in Connecticut.
From what I read that the average domestic rate in Connecticut is around 23.5 cents per kWh.

The reason I ask is that we are working out your usage from the money you pay, but if that is not quite right, your usage may actually be a lot less. It's just that electricity prices in Connecticut have become pretty high!

Do you have other charges to pay as well? Here in the UK we have a 'standing charge' of so much per day, irrespective of how much electricity we use, so it's more tricky to work out actual consumption purely from monthly payments!

 

[Inovermyshould]

Are you sure this is your rate?
Your profile suggests you are in Connecticut.
From what I read that the average domestic rate in Connecticut is around 23.5 cents per kWh.

The reason I ask is that we are working out your usage from the money you pay, but if that is not quite right, your usage may actually be a lot less. It's just that electricity prices in Connecticut have become pretty high!

Do you have other charges to pay as well? Here in the UK we have a 'standing charge' of so much per day, irrespective of how much electricity we use, so it's more tricky to work out actual consumption purely from monthly payments!

Yes, I called them. I have been going over this in my head and can't figure it out but Monday I will call my Electrician, maybe they can measure the power consumption, we will see.

 

[Inovermyshould]

This is the reply from the electrician, who installed charger.

"The wiring is all new and correctly sized (#6AWG - copper) and properly terminated in the charger. The only variable left would be the fuses/panel/service and existing connections on the line side. As stated before, your existing service, meter enclosure, and fuse panel is in disrepair and it is our opinion that it needs replacing. Electrical connections and terminals that are corroded and or loose and not torqued to original specifications can cause significant resistance in conductivity and therefore result in higher power consumption."

 

[brianmoooore]

For a resistive load, a "poor connection" will always decrease consumption.