Charging Volt/Current Display

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leadwings
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Charging Volt/Current Display

Post by leadwings » Fri, 14 Jan 2011, 18:53

Found this on e-bay and thought it might be of interest to others:

http://cgi.ebay.com.au/ws/eBayISAPI.dll ... gory=25410

The lines to my charger are permanetly connect to either end of my battery pack - so if I put this meter between my charger and my pack, I can check at any time my pack voltage and also see what DC amps the charger is putting out.

You could do the same with a clamp meter, but this seems like a simple neat solution.

So I contacted them and asked if they can do one running off my pack voltage. They responded with:

Hi, thanks for your message, this price include a current shunt, The price of AC/DC 25~250V power supply version is different with the standard version; it needs add a small transformer behind the meter, so it will add 9.99 USD for each meter, thanks for your understand, I have sent a 39.99USD paypal invoice to you, please tell me after your payment, there is a wiring diagram paper in the pakcage, thanks.

-----------------------------------------------------------
Shopping List:
-----------------------------------------------------------
Item title: 20A 200V DC BLUE LED Digital Panel COMBO Meter + shunt
Power supply: AC/DC 25~250V
Qty: 1
Price: 39.99 USD
Shipping fee: FREE
Total price: 39.99 USD
-----------------------------------------------------------
Total price: 39.99 USD


For $40 it seems like good value and I have ordered one. I'll put it in a plastic case with plugs either end so I can pull it in and out easily, then check it's accuracy with other meters and post results on how it goes.

bga
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Charging Volt/Current Display

Post by bga » Tue, 18 Jan 2011, 23:53

Those things are designed to work on a 12V electrical system, probably in the +ve lead side of the circuit.
I would expect that the AC/DC version would need an isolated switching power supply, so it is isolated from the HAZV and will operate off the 12VDC supply.

While this will work, it means that traction battery leads from the shunt have to be brought into the passenger compartment and should be considered live at the traction battery potential (HAZV).

Because they are attached to the shunt, that there is potential for a lot of DC current to flow and significant fire or shock risk. Also, the direct wire connection will likely allow a lot of EMI to enter the cabin from the traction power system.

I would recommend a hall sensor so that the DC battery line is galvanically isolated from the 12V meter circuits at the shunt and no HAZV enters the cabin.


PS it may violate the isolation of traction power from 12V power systems requirement in NCOP14.
Last edited by bga on Tue, 18 Jan 2011, 12:56, edited 1 time in total.
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leadwings
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Charging Volt/Current Display

Post by leadwings » Tue, 18 Jan 2011, 23:58

I am not bringing this into the cabin - I actually want it under the bonnet in a box with the leads from the charger going through it, so I can see the pack voltage at any time when poking under the bonnet.

I purposefully don't want to mix LV and HV, or bing HV into the cabin.

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Charging Volt/Current Display

Post by avolt » Thu, 20 Jan 2011, 03:28

i wanted to do the same thing,
i got some gauges from ebay,a box from dick smith and this is how it turned out.the other gauge is a temp gauge.
i found my charger charged at a lower setting 6.4amps,
now i have it set at 12.8amps and i can see when i walk pass the car what the charger is up to.
i find it very handy


Image
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Charging Volt/Current Display

Post by evric » Thu, 20 Jan 2011, 03:43

Very nice...
Prius Plug-in Conversion: http://www.evplus.com.au ...Holden Barina EV: http://www.evric.kestar.com.au

bga
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Charging Volt/Current Display

Post by bga » Thu, 20 Jan 2011, 14:50

Hi Malcolm,

I have always had RF problems from leads like aftermarket tachos and gauges, but not as bad as one of my Uni friends who had a positive earth mini, but a negative earth stereo etc. There was the occasional smoke-out or fire.

The under bonnet arrangement looks tidy.
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Johny
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Charging Volt/Current Display

Post by Johny » Thu, 20 Jan 2011, 15:09

Nice and tidy but there don't appear to be any BMS wires. No BMS?

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avolt
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Charging Volt/Current Display

Post by avolt » Thu, 20 Jan 2011, 21:13

i have a BMS but did not like it,so i run with no BMS and have done for 2500km's now with no faults.
i under charge the 90ah batteries to 3.53v and i don't let them get any lower than 2.66v on discharge,(120v then under load when driving)
i still have a range of 60km but i never push it that far.
my normal driving every day is about 20 to 35km.
i have limited my controller for a max of 270amps.
i can still do 100km easy on the road and i have plenty of power
i even tow a trailer from time to time with no problems.
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Charging Volt/Current Display

Post by leadwings » Thu, 27 Jan 2011, 18:11

avolt wrote: i wanted to do the same thing,
i got some gauges from ebay,a box from dick smith and this is how it turned out.the other gauge is a temp gauge.
i found my charger charged at a lower setting 6.4amps,
now i have it set at 12.8amps and i can see when i walk pass the car what the charger is up to.
i find it very handy


Image


That's the same sort of thing that I was thinking - can tell volt and current when charging, but will be the one display with a button to switch between the two readings.

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leadwings
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Charging Volt/Current Display

Post by leadwings » Sun, 17 Apr 2011, 20:55

Finally got it all madeup and installed - works well.

Press the little button and it switches between volts and current - handy to see the pack state of charge. Checked the voltage with my DVM and was within 0.2V, and the current with my clamp meter and it was with 0.5 of an amp.

I have also stuck a pack voltage table on the charger to make less thinking required.

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leadwings
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Charging Volt/Current Display

Post by leadwings » Sun, 17 Apr 2011, 21:01

Some photosImageImage

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leadwings
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Charging Volt/Current Display

Post by leadwings » Thu, 21 Apr 2011, 23:43

Oh yeah - and the swith turns it on/off, so it's not drawing current when not needed.

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