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Post by chuq on Jan 25, 2017 12:48:04 GMT 11
Does anyone know of, or can recommend, a device which will passively measure the energy flow through a cable? I’ve seen devices such as this one: www.currentcost.com/product-transmitter.html - which is designed to be used with a home energy monitoring system, but I’m not sure how accurate they are – and is there something more portable with a built in display? I was interested in one of q4gber’s comment here: ozleaf.proboards.com/post/12611 - suggesting that the Leaf can accept charge at up to 4kW. On a recent trip I replenished 7 bars of battery with a 15A EVSE in 2 hours and 10 minutes, which is pretty fast, but I assumed it was only 3.3kW. |
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Post by pharmadave on Jan 26, 2017 0:40:52 GMT 11
I found this image I took a while ago when I was trying out a Level 2 charger at the BMW headoffice in Mulgrave. It does seem to show the Leaf accepting higher than a 3.3Kw input. This means that potentially it can charge at 4kw mentioned and therefore a bit faster than officially quoted. So if you wanted the squeeze every possible charging potential out of your Gen 1 Leaf, it might be a good idea to get a 7.6Kw level 2 charging cable? It also means any new EVs you get will be compatible with it too!  |
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Post by lesmando24 on Jan 26, 2017 11:39:31 GMT 11
That is the amount the charger is drawing, not what is going into the battery. There are losses in the charger and it runs two cooling pumps at the front of the car. I don't know of any way to see how much is going into the battery, maybe leaf spy?
les
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Post by chuq on Jan 26, 2017 15:15:38 GMT 11
Interesting.. I've found other sources that suggest 3.3kW into the battery is 3.6kW before losses, so 3.75kW is still impressive.
I'm considering getting a Mennekes (Tesla) to J1772 adaptor - most Tesla destination chargers are minimum 7kW - I'll still need a way to measure it though!
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Post by stewartm on Jan 27, 2017 9:07:47 GMT 11
Some Mat, if the 15amp remains constant as per a constant current DC unit,
draw @ 240 Volts is 3.6kW
Draw @ 250 volts, 3.75kW
Draw at 260 volts, common if you have lots of solar input, then its 3.9kW
Just a thought
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Post by 4wardthinking on Jan 31, 2017 13:17:31 GMT 11
Exactly, our PD here sways between 227vac and 247vac, I have seen 251vac as well, and on a calibrated Fluke, so it can't be far out.
Just remamber watts is effectively, with no power factor correction, volts multiplied by current. How they are measured also is a factor to consider.
The up-shot is theoretical with respect to actual demand, of which there are many others to take into account, but I'd sit tightly at 3.3KW, as the consumed by batteries load given how the power is regulated by the cars systems.
If it was designed to take 15a at the battery, there may be more lost along the way to it.
Just remember a 2KW bar heater as it begins to warm up is an almost complete! short, and can take infinite current momentarily, which makes it more than 2KW!.
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