if People face problems with EPR (900Watt) oder APR eeprom flashing, i just made some really interesing observations today.
So i was not able to programm my EPR or APR with all the methods that are pointed out here.
So the PSU's were actaully useless for me, thats why i risked to flash teh firmware from the Russian Forum on both devices even knowing that they are different Models (Watt-Wise). http://electrotransport.ru/ussr/index.p ... #msg490810
After flashing the firmware i could programm both devces with the eeprom file added to the .zip file (even without bin-hex converting)
Both devices changed setting like i wanted.
One positive sideeffect was that on the EPR i allready made a Potentiometer-Mod an cutted the OVP-trace.
so iactually wanted a multi charger for my 10s(41 Volt) electric mountainboard, adn for my 15s(61,5 Volt) ebike.
An the APR the lowest programmable Voltage is 43,3 Volts, even though i tried to programm the Voltage to 41 Volts.
What is very interesing now is that on my EPR with the potentiometer-mod it turns out that the lowest possible Voltage is 40,6 Volts.
I tried to programm it even lower to 35 Volts, but 40,6 is really the lowest it would go down.
So i was programming the max Voltage to 61 Volts and the output voltage to 40 Volts on the EPR.
if i turn the Potentiometer from the Highest to the lowest resistance not i have my Multi-Charger for 10 and 15s with 40,6 Volts and 61 Volts output adn all the scale inbetween
I will make the Resistor Mod and OVP-trace-cut on the APR too to see if it will also have the same effect.
PS.: so as a conclusion
-the lowest possible Voltage i could set is 40.6 Volts
-the highest would be above 80 Volts (not Sure if teh Caps could handle it with load though)
-i could flash the EPR with the APR Firmware without Problems
(? i'm even not Sure if EPR and APR 900 and 1700Watts are even the same just restricted by firmware, cause inside they look pretty identical)
!!!! and one Open Question to you out there,,, Does anyone know of an Resistor /Potentiometer Mod to control the Output-Current on the APR's ?? that would be amazing