[bassek]

Due to rising power costs (was going to be a 600% raise from last winter, but my power company terminated my contract) I have begun to cut down unnecessary power consumptions. Starting October, I will have spot market power prices, so I will mainly charge during the night at home between 12pm and 6am.
I assume the losses are higher when approaching the 100% level. My main question is, has anyone seen (or measured) the charging losses at different battery levels? Is there some significant difference between the 80% and 90% levels?
I use the granny plug with max 3,7 kW.

 

[kopaszkrapek]

Due to rising power costs (was going to be a 600% raise from last winter, but my power company terminated my contract) I have begun to cut down unnecessary power consumptions. Starting October, I will have spot market power prices, so I will mainly charge during the night at home between 12pm and 6am.
I assume the losses are higher when approaching the 100% level. My main question is, has anyone seen (or measured) the charging losses at different battery levels? Is there some significant difference between the 80% and 90% levels?
I use the granny plug with max 3,7 kW.

Why do you think there is higher charge loss above 80% main batrery level ?

 

[Milkfloat]

Unfortunately, I can't quantify it but charging the last 20% will certainly be less efficient than charging the first 20%. Quite simply, more heat is generated and heat equals loss. However, perhaps more important is the extra loss due to using the Granny Charger. It certainly doesn't charge at 3.7kW but rather more like 2.2kW. All the system load plus the coolant pump operates whether charging at 2.2 or 22kW. Consequently, the proportionate loss is greater.

 

[bobw.cx5]

Due to rising power costs (was going to be a 600% raise from last winter, but my power company terminated my contract) I have begun to cut down unnecessary power consumptions. Starting October, I will have spot market power prices, so I will mainly charge during the night at home between 12pm and 6am.
I assume the losses are higher when approaching the 100% level. My main question is, has anyone seen (or measured) the charging losses at different battery levels? Is there some significant difference between the 80% and 90% levels?
I use the granny plug with max 3,7 kW.

Because the cost difference between ICE fuel and electric charge is so large I don't think about it too much.,
I am on standard electric tariff, so time of day makes no difference to me , I only charge twice a week on average..

 

[jlcmalves]

At least with Teslas' OBC, with AC charging the higher the better, as shown in these graphics: