Recent content by otas

I am in a similar position, I have Erider Model 30 with 5 x 12V 20A led acid batteries not even 2 years old. My range is hardly 12m. On flat I can reach 30mph. Uphill it struggles. From 62V it drops under load to 54V whilst drawing 17A. So I am thinking about hybrid. IC generator 4 stroke and...

Thanks for results of your homework Jeremy, yes, the DNP looks like stamped from a cheese, not steel. This one looks like an honest job. I got worked up on the 11gear, which would be 27% improvement, this is only 16%. I have friendly machine CNC shop in CR, they are crazy into racing Moped...

Jeremy, have you tried this by any chance? I wonder if it fits the wheel and operates via the existing grip shift? thanks otto

Hi Magudaman, nice job, shame about the slot. What about drilling individual holes, if no mill is at hand? otto

Today I rode despite the drizzle and 5 deg., just 4 miles, fantastic. Throttle LED gauge still on max. I need windscreen wipers for my goggles. Any suggestions? Max. speed 29mph, avg 17.8mph. My front chainwheel is 52, and I can pedal up to 23-24mph, but I have to pedal like mad. I have lost the...

Gwhy, there is perhaps a little misunderstanding. The modified throttle indicator works fine with all 4 LEDs working as they should in the max-min-empty display. It has got the usual limitation of estimating the power left by measuring voltage across cells as any voltmeter would have. Slight...

Jeremy, I agree, this is far from your elegant and precise power meter, I have tried the same, first the drop resistor, which I found not very good, than voltage divider, which had to have relatively small resistances to have the output suitable for 5k ohm "LED voltmeter/indicator". I did not...

For PIC and little associated logic circuit supply I use a drop resistor, zener BZX-C5V1 and ceramic 100nF 50V cap. as a filter. This gives me 5.1V and does not have to be too precise. For 12V I use 2k2 resistor. The PIC is quite happy, and I drive 741 and gate of a MOSFET switch with it. Cheap...

Exactly, but I wanted to KISS - keep it simple s... LED's will start dropping off after approx 70% remaining power, which I think is acceptable. For me at least...

I am moving my intended project of Jeremy's PIC power indicator with linear LED display further into infinity, but I need now at least the indication of voltage of the battery. The original LED indicator on the twist throttle is in a good position, is for 24V lead battery and cannot do much on...

Hi Chekola, I rode the bike yesterday, but it was so bitterly cold, 3deg C above, so I gave up after 3 miles. I will wrap up proper and try again. cheers otto

Jeremy, is it necessary to disconnect the batteries? If we have two packs in parallel and two of these in series, what is stopping us from connecting the positive from one charger to negative of the other charger (they are isolated) and connect this to respective battery terminals with the...

I am reluctant to use connector, as I want to leave it permanently connected. How about a diode in each DC-DC convertor feeding the Lipo batt. with the voltage sense before the diode. The DC-DC convertor output would have to be increased due to the forward voltage drop, and we would have to...

Jeremy, thanks for your comments. Sorry, I have just read it now, after spending an afternoon actually riding the "stealth ebike". In the excitement I have started a new thread on Hybrid EGO scooter with genset. I did not want to sidetrack this thread, as they are quite diff. approaches. I will...

Thanks Jeremy, I programmed it with 30A and 70A phase current, I rode for 1.5 mile, it was dark and bitterly cold, but bike feels lively and snappy. I could see 25+ mph most of the journey. I think that's enaugh, I have to do something with the brakes. Mosfets and motor are cool as a cucumber. I...