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This app and hardware would be incredible for my Mercedes. I really want to put a big, fancy tablet in the console, Tesla style. I just sent him an email asking about modifications for a higher maximum voltage.

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This app and hardware would be incredible for my Mercedes. I really want to put a big, fancy tablet in the console, Tesla style. I just sent him an email asking about modifications for a higher maximum voltage.
That would be good, could you give us feedback on his reply ?
 

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Hello colleagues,
My name is Yuriy Logvin and I'm a Power Watcher developer.
I have received several emails from you with requests for a higher voltage device(~400V).
The onboard Dc-Dc converter should work with this voltage. But in practice I had a negative experience with higher voltage.
Probably, I need to make another plate layout with different power supply from 12V battery to resolve this problem.
Plus, measuring high voltage must be with galvanic isolation.
This would probably make the device more expencive and will take some time.
 

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Hello colleagues,
My name is Yuriy Logvin and I'm a Power Watcher developer.
I have received several emails from you with requests for a higher voltage device(~400V).
The onboard Dc-Dc converter should work with this voltage. But in practice I had a negative experience with higher voltage.
Probably, I need to make another plate layout with different power supply from 12V battery to resolve this problem.
Plus, measuring high voltage must be with galvanic isolation.
This would probably make the device more expencive and will take some time.
How much more expensive do you think it would be? This kind of instrumentation and functionality would be very useful for us. I'm happy to wait and pay the necessary difference.

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I think the build is worthwhile a lot of people are using higher voltages, think there in a hole in market for more EV dash displays
 

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I would gladly pay the premium for HV to use this.

You could also make an add on board that includes the voltage divider or step down circuit that would then send 24-200V to the current board. Then add a voltage scaling factor in the software to adjust the voltage reading for the display/calculations.

I’m in for one of these boards either way.
My suggestion would be to make it functional to 420V or 450V as that just about the upper limit on most product EV packs/controllers.


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You could also make an add on board that includes the voltage divider or step down circuit that would then send 24-200V to the current board. Then add a voltage scaling factor in the software to adjust the voltage reading for the display/calculations.
Firmware already has a voltage scaling factor. It's realized via voltage calibration(button in software).
But the device has self-consumption(that can change in time). It will give a mistake in voltage measuring.

I'm more inclined to start developing Power Watcher HV, but I need to find a better way to do it.
 

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After using Power Watcher for only a few days I think its really is amazing & I just found more customisation features by reading the documentation, which I just skimmed to begin with.

Heres a better video using a screen recorder overlay.

https://youtu.be/Xv0pa3uMPN0
This looks great. Literally, I'd buy it right now if it were available for higher voltages. I already have a Zeva BMS in my MG, but I'm considering getting the 200v unit for extra data.
 

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This looks great. Literally, I'd buy it right now if it were available for higher voltages. I already have a Zeva BMS in my MG, but I'm considering getting the 200v unit for extra data.
Yes I have Zeva BMS also, now that I cave calibrated PW Current sensor ( after reading instructions) I'm pleased to report remaining battery % matches PW perfectly , The functionality of the PW is a perfect adjunct to BMS display. The kwh used is also very close to what my kwh meter on charger mains supply indicates.
 

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I'm more inclined to start developing Power Watcher HV, but I need to find a better way to do it.
I think I finded the best decision.
Now I working with PowerWatcher3. It has RS485 bus for digital current sensor and display. I think adding an external voltage sensor is logical.
 

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I think I finded the best decision.

Now I working with PowerWatcher3. It has RS485 bus for digital current sensor and display. I think adding an external voltage sensor is logical.
Good to hear! When do you think it will be ready for purchase?

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Hello followers :)
The development cycle for new device needs around 4-8 weeks. If have no bugs we have first 8 devices.
Cycle giving next revision is 3-4 weeks.
Have start Pw3 + external digital voltage and current sensors.
Voltage sensor has a layout bug.
For Pw3 I create some changes in connector pinout.
So all devices have sent on the next cycle.

Printed box for PW3.
 

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