November 25, 2019 at 08:49 #44249
After years of torture with BCI, Check connections etc, I’m now the owner of 3 chargers, all experiance”Spooky effects at a distance “and might work if you tap you head 3 times on a good day or a very wet one.
Peaking inside the chargers, the best being from Andyfras, formerly of this parish, I wonder if all things being equal, very little needs to be in a charger at home, given safety, in the form of RCD, (residual current device). I do wonder how the Zoe may limit the current however, and any thoughts on this would be appreciated. I have 32amp and 10amp chargers.December 2, 2019 at 10:40 #44266
I’m still here, but I don’t check this site very often.
A charger is fundamentally just a mains switch; all the clever bits are to do with communication between charger and car and agreement of a charging rate. Plus some safety bits of course.
There are 2 ways of determining the charge rate:
Firstly, the charger tells the car the maximum that it can provide; this is via the CP wire and is in the form of the pulse width of the signal.
Secondly, there is a resistor inside the cable that tells the car the maximum current for the cable. The car will adapt accordingly.
On my home charger, I have fitted a switch inside the connector so that I can change the charge rate in order to optimise for solar charging. The charge rates available are 13A, 20A or full 32A.December 4, 2019 at 08:41 #44276
Thanks Andyfras, your granny charger, 10 amp working well, and as you say limiting the current drawn by the car is the key. So the cp wire and resistor are essential. The BP Polar man fitted a 32 amp RCD, so no need to repeat that as its already in the circuit. If it was possible to cannibalise the polar, charger master declared lack of interest many years ago, would that be worth considering with no need for various lights etc? There’s a vast difference between Rolac and Polar in terms of complexity and with my BCI and “Check connections” simple/basic would be a useful way forward.December 5, 2019 at 12:04 #44280
As you may have seen in the Speak EV thread, I did cannibalise a Polar charger (to get around a software issue) by using Arduino based Open EVSE circuitry. I utilised as much of the Polar parts as possible and kept the lights, albeit with slightly different functions. It worked well, with very fast boot times, and it still provided the full 32A.
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