Comments on: Charger efficiency

By: Jeroen Meijer

Jeroen Meijer — Wed, 08 Jul 2020 21:12:27 +0000

See last line of the post. I will probably get it and actually, I expect BETTER results @ 3 phase since the rectified voltage doesn’t drop so deep at, see https://canze.fisch.lu/charging-currents-three-phase/

Edit: next post has the 3 phase data!

By: Jeroen Meijer

Jeroen Meijer — Wed, 08 Jul 2020 21:08:34 +0000

In reply to lobinj.

I will ask about the cooling, though I suspect it was not cooling, maybe just the back fans. 96% sounds unrealistically high, to be honest. But, I am promised to get 3 phase data too, so we’ll see.

Edit: answer: there was PROBABLY no cooling, but can’t be 100% sure unfortunately.

By: Martijn Hendriks

Martijn Hendriks — Wed, 08 Jul 2020 11:37:09 +0000

I assume this is all 1-phase testing. Isn’t the ‘ineffectiveness’ mostly applicable to 3-phase charging? Any data on 3-phase as well?

By: lobinj

lobinj — Tue, 07 Jul 2020 22:20:52 +0000

I have tried to measure as well with much less qualified equipment. However, there is a huge difference when charging and the battery cooling (or heating) system is running or not. So the above number should state to what extend the cooling (or heating) was in operation. I was only able to measure using a metering device vs. the CanZE values on a R90. The values have been at 11kW:
96% (!) without cooling
82% with cooling

so my second measurement (with cooling) matches the above results at 16A pretty good. The measurement was taken in spring time in the evening. So ambient temperature was rather cool. Since I charge only during night, I usually can charge without cooling activated which makes a big difference obviously.

Is there a statement from the person measuring under what conditions the charging has taken place? I was always wondering if the 96% can really be that high.