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    Berg Viper DH 8kw Bike for Sale

    After using it not too much recently i want to sell my tuned Berg Viper DH bike. I put lots of effort into the build quality of the bike. Everything is rugged and components are high quality. Components: - Berg Viper DH Frame - Mxus 3k Turbo 4T Motor in 19" Motocross - Battery 19S7P = 79,8V...
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    Rectifier Huawei R4850G2 48V 42~58V 3000w

    great find, i will mod mine too :bigthumb:
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    Rectifier Huawei R4850G2 48V 42~58V 3000w

    Lately i have tested my r4875g2 for max power. Somehow i am not able to go above 58A :?: If i send the CAN command for setting current to 65A i end up with 1A or less. At first i thought it is an integer overflow somewhere in the CAN code but the value that is send to the PSU is 58*20 = 1160...
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    Rectifier Huawei R4850G2 48V 42~58V 3000w

    in case anyone cares, this is how my PSU looks now: i soldered 8mm bolts for battery and attached screw terminals for 2.5mm^2 230v cables. Hopefully enough for 70A for several hours :mrgreen:
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    Rectifier Huawei R4850G2 48V 42~58V 3000w

    Today i was able to test CAN communication on my R4875G1. So far it works more or less out of the box. :thumb: It pulls 4w standby. Fan is more or less silent. If current is set to 0A the voltage starts dropping slowly and the fan ramps up for no reason. Hopefully this changes with a battery...
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    Rectifier Huawei R4850G2 48V 42~58V 3000w

    Has anyone tested the CAN code for other models like r4875g1? I would prefer this model because of the 4000w but if CAN controlling does not work, its useless :confused:
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    Dr_Lulz's 8kw Berg Viper

    latest update: Right now i am working on street legalization with german TÜV + electric braking + legal lights
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    Dr_Lulz's 8kw Berg Viper

    i have used lead free solder. But i would recommend to use leaded because i had to redo a few joins ....
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    Dr_Lulz's 8kw Berg Viper

    i have used an old cooking plate, set it to 400°, put the strip and copper wire on it and then simply soldered it
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    Dr_Lulz's 8kw Berg Viper

    hehe, i have wrapped every parallel pack in 1 layer of kapton. Between the packs are: shrinkwrap - kapton - kapton - shrinkwrap. Also the batterys are glued together so nothing moves Hopefully this is enough :flame:
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    Dr_Lulz's 8kw Berg Viper

    Btw during testing i found that my mxus 3k seems to run very uneven. I was expecting a little more quality for its price. See in the video: (The chain is shaking!) https://streamable.com/s/2xz6s/qdpxnv
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    Dr_Lulz's 8kw Berg Viper

    The frame is 17". There is only one size :(
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    Dr_Lulz's 8kw Berg Viper

    another update! Bike is almost done, was running it on testbench a few times with limited current. I can already feel the power :twisted: Here a few more pictures that i made during the build Battery: 6 mm^2 copper, good for short 100A bursts (i hope) arduino spot welder Kelly...
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    Dr_Lulz's 8kw Berg Viper

    anyway there was some progress the last month i designed the battery box mount 3d printed prototype and also made a backplate for the torque arms including the derailleur mount (no CAD pictures, sorry) both custom laser cut out of 4mm steel and 10mm aluminum mounted: (not yet final)...
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    Dr_Lulz's 8kw Berg Viper

    well, for me peak means maybe 10-15 sec MAX. In general voltage should be as high as possible to reduce losses. I dont care about the topspeed i am planning to go street legal here in germany so i will be limited to 4kw nominal power (not peak!) and 45km/h anyway. unfortunately last week my...
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    Dr_Lulz's 8kw Berg Viper

    do you really think i cant squeeze more than 10A from 18650GA? If it takes 10A continuous then it should be able to handle 15A burst right now i think about going 22S = 92.4V ... fets should be able to handle it
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    Dr_Lulz's 8kw Berg Viper

    UPDATE: this is how it looks now: Stats: Berg Viper DH Frame 200mm suspension front + back Magura MT5 Mxus 3k Turbo 4T 133x NCR18650GA in 19S7P = 79,8V * 23,5 AH = ~1500 Wh Kelly KLS7218 sine controller Topspeed 70 km/h 60 km range 40 kg ZERO noise while driving OLD POST: Hello guys...
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    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    maybe you could just reduce the gate resistors?
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    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    i am trying to do the same right now ... not tested yet my plan is to change - fets -> CSD19536KCS - big caps -> 100v 470uF x 3 - dcdc for powering the controller -> 100v mini stepdown module from ebay - battery voltage resistors - snubber? caps to 100v 470nF
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    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    Casainho can you explain whats the difference between "MOTOR_CURRENT" and "BATTERY_CURRENT" in your code? Both are measured from the 100mOhm shunt, so both are actually battery currents? I want to understand how the phase current limiter works. The MOTOR_PHASE_B_CURRENT is by design close to 0...
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    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    well ... good point. I think i will go for the 12x CSD19536KCS. Much easier!
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    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    I am thinking about running one of these controllers at 84V 100A and ~150-200 Phase amps so i will need at least 18 fet. But i dont have space on my bike so i am thinking about building a little power stage on top of a 6fet version using 18x IRFB4110. I will just remove the fets and caps and use...
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    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    I am running a geared motor on my bench so its hard to tell if regen works. How to activate it? relase the throttle? Do i need the brake signal? Right now i did not notice any problems when releasing throttle. Btw: is there active freewheeling implemented?
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    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    that works! Motor running smooth. Seems like current is a little bit less as well
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    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    hmm you are right. Unfortunately i dont have an oscilloscope to measure this. Right now i have 2 code versions that run the motor smooth: "regen mode" disabled // minimum speed to do FOC if (ui16_motor_speed_erps > MOTOR_ROTOR_ERPS_START_INTERPOLATION_60_DEGREES) { // read here the...
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