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Power consumption during charging battery

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Javi
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 Javi
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Hi everyone...

A week ago I got a current logger that I used to monitor and record the power consumption during battery charging. The battery has a 20% of charge (as I explain previously, when you use two batteries, at 20% the CPX swaps from one battery to the other).

Her you have the consumption evolution that I recorded in the wall shocket.

Carga bateria

The mains in Spain is about 230 V. The maximun measured current during charging was 4.9 Amps! In chrger specs it says 5 A max. So very precise. As you can see on the plot, the recharging from 20% to 100% takes less than 3 hours. That is really quick. 

Battery nominal specs are 60 V 45 Ah... so about 2.700 kWh. For charging the 80% of the battery took about 2.300 kWh from mains!

Just for your information 😉

...Javi

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curlyboi
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Here I have similar measurement, but with data directly taken from CANBUS communication between battery and charger:

https://wiki.voltgaraz.cz/candump/?original.txt

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Javi
Posts: 82
 Javi
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Really nice job!!! It also looks that during the charging period the temperature do no increase a lot. How do you read that info from the battery canbus? Where can I found information about this communication? I like electronics but I have no experience with canbus (further than changing a couple of parameters un my car).

Thanks for sharing it 😉 👍 

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Javi
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 Javi
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In my case I read the current and voltage from the mains and you between the batery and charger. The efficiency of the charger looks very high!

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Javi
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 Javi
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I see that on your link it is possible to see that you used a couple of charger, a 5 V 70.5 v one and the original on. Do you think it will be a problem using a 5A one? 

I am planning to instal a permanent charger in the CPX and use a waterproof 220 V iec C13 plug on the bike for charging it easily in public places or garajes (time is not an issue). I found the place for the charger (under you feet, if you release the 4 bolts, there is a quite big space, jejeje). With the charger instaled it will be easy to connect the charger (using a switch) with the charging plug internally.

IMG 20201223 080150

What 5 Amps charger you used and how you connected it?

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curlyboi
(@curlyboi)
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@javi Here is what I decrypted of the CAN protocol so far: https://wiki.voltgaraz.cz/index.php/CAN

The charger is a non-original charger for LiIon from AliExpress with variable (5-25) current. I use it for slow charging because it is quiet (I also replaced the fan in that charger for a Noctua to make it really quiet). It is metalic orange one, if you search 17S charger you will find it (17s = 17 cells in series)

Furthermore, at home, I use the CAN adapter connected to a Raspberri Pi in conjunction with the charger to integrate it into my smart home. For example: I come home and plug the battery, but the charger is disconnected by smart plug so the charging doesn't start yet. My smart home waits before the battery warms up to 19C and then it turns on the smart plug :)) Then it monitors the CAN for the whole period of charging and once the battery indicates it is finished, I power off the smart plug again and send a Telegram message about the charging time and percentage 😀

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Javi
 Javi
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@curlyboi

I am trying to understand how the batteries work.

For charging the battery with the 5 Amp charger you just connect the charging pin to positive voltage and that all?

Can you charge the batteries with the same method, i mean 5 amp and connecting charging pin with possitive voltage, if you use the external bike charging plug with two batteries installed?

What mode A and B mean?

Can you take a picture of your can-bus to raspberry connection setup?

I read that Supersoco uses RS485 instead of regular can-bus. A few pictures of the cambus-raspbery module and connections to the charger cable will be very useful 😉

Thanks in advance... Javi

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curlyboi
(@curlyboi)
Joined: 7 months ago

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Posts: 19

@javi

A and B mode differes if the battery is in slot A or slot B in the scooter (rear or front). This is so that when you have both batteries, the scooter can differentiate between values from one and other battery. I have not yet tested charging with the plug in front of the seat because I don't have outdoor plug.

When charging with any (original or not) charger, you also need to connect pin2 to ground to enable charging mode. Otherwise the battery will not accept charge on the voltage pins. This switches the battery to charging mode. The pins on the connector are explained here: https://wiki.voltgaraz.cz/index.php/Battery_connector#Gen_2

Finally, RS485 was probably used on older bikes (didn't test), but CPX uses proper CAN.

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Javi
 Javi
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@curlyboi

Thanks a lot! I was a bit confused with A and B modes. I will look for an can-bus to usb adapter to learn how the system behaves when charging two installed batteries 😉

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curlyboi
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Posts: 19

@javi

The Y-cable is perfect for this dignosis... I removed one branch, so now it's just regular extension cable, but I stripped the insulation on the CAN pins and connected to my adapter.

This is the one I use, and it's perfect. Works on Windows and Linux.

https://www.aliexpress.com/item/4001164534407.html

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