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53V after 22 miles with 52V battery, is that good? Please check my math...

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  • PatrickGSR94
    replied
    Originally posted by oledave View Post
    If you haven't tried switching your display to have 9 levels of assist try that, it will give you some levels in between the ones you are using now and that may work better for you. You can also reprogram the settings to a little bit lower setting and that might help you, if you don't want to charge to 90%. If you are still using the throttle to get you going that uses a lot of battery also, if you pedal to get yourself going that will increase your range. Part of the fun of these things is learning how to get it to work well for what ever it's being used for.
    Thanks, I got the programming cable last week but still haven't connected it up to check out the settings. Part of the reason I've been using throttle off the line is because my chain line is so bad, and my bike is so heavy that it's really hard to get it going under pedal power in 4th or 3rd gear. 2nd gear isn't as bad, but I'd really like my lowest gear available. But with the chain line I'd rather not apply power through that gear for fear of breaking something.

    Also I did do the 80% charging night before, than topping off to 90% the morning of, on Friday's commute, and it seems to work pretty well. Still had some volts left when I got home without completely draining or getting near LVC.

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  • oledave
    replied
    If you haven't tried switching your display to have 9 levels of assist try that, it will give you some levels in between the ones you are using now and that may work better for you. You can also reprogram the settings to a little bit lower setting and that might help you, if you don't want to charge to 90%. If you are still using the throttle to get you going that uses a lot of battery also, if you pedal to get yourself going that will increase your range. Part of the fun of these things is learning how to get it to work well for what ever it's being used for.

    Leave a comment:


  • PatrickGSR94
    replied
    So I've been a little disappointed in the apparent range when charging to 80% instead of 100%. In an earlier post I noted my first commute to work, after charging to 100%, I got home in the afternoon after 32+ miles with more than 51 volts still showing on the display. That seemed really great to me.

    Now I've been charging to 80%, so I'm starting out with around 55.x volts, and when I get to work I barely have 50-51 volts. This past Friday I took a different route home which is slightly shorter than my normal route, but has more hills and more traffic. Plus I had gone about 2 or 3 miles to run an errand during lunch. About 1 mile from home in the afternoon I think it was hitting the LVC? It felt like the motor was cutting out intermittently. The DPC-14 display showed red on the battery symbol, and the voltage was drooping into the 41.x volt range with the motor running. Whenever I would stop or switch off PAS to 0, the battery would recover to around 43 volts.

    I'm hoping I didn't run it too hard. I'm charging 3 or 4 times a week, and really hoping to maximize the battery life because it's a huge expense to me. Should I be charging to 100% once a month (every 12-16 charge cycles) or more like every couple of weeks (every 6-8 charge cycles)? I read a comment on one article that mentions not letting it sit at 100% overnight, and instead charging to 80% the night before, and then bringing the pack up to 90% just before riding in the morning. Would that work okay without having a detrimental effect on pack life? I feel like having that little extra 10% would be just enough to make the round trip work commute without running the pack too low.

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  • Gr8fun
    replied
    I put 5000 miles on last year.. 35 miles a charge average. Normally driving over 20 mph(11.5. Ah battery) 142.? Cycles.
    No deterioration noted.
    I am now pushing 25 mph averages. Time is a factor in battery as well as cycles. I intend on using it up before (use by date). That looks difficult.

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  • OptimusPrime
    replied
    It doesn't matter how many times you charge it. What matters is how many times you empty it.

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  • PatrickGSR94
    replied
    Yikes, I don't want to think about how fast that would wear out the battery... a year maybe?

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  • Gr8fun
    replied
    Soon you will be taking a charger to work so you can use a full battery each way....

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  • PatrickGSR94
    replied
    And after getting home today, 33.5 total miles for the day (including lunch errand), averaged 18.5 MPH this afternoon! 16 miles in only 52 minutes. Still have 51.5 volts remaining.

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  • PatrickGSR94
    replied
    First commute to work this AM, I used mostly PAS 2, with some 1 and 0 on downhill sections, and PAS 3 on uphill sections. I started out at 5:22 this morning, 15.5 miles in 59 minutes to arrive at work at 6:21 AM. I think I stopped and put a foot down on the ground just 2 times the whole way. 16 MPH average, and I still have 55.1 volts! And that was with a 10 MPH headwind. That will leave MORE than enough to get home this afternoon, with a 15+ MPH tail wind.

    Last night was only the 2nd time to charge the battery. My plan is to charge to 100% another 2 or 3 times, then switch to 80%. I'm still charging on the 3 amp setting (5 is max on the Advanced Charger). So this makes me feel pretty good about being able to do a full 31 miles round trip commute at a decent speed, even when starting out with 80% battery level.

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  • Gr8fun
    replied
    I put on over 5000 last year. The uses have only increased. Next is camping trailer with solar roof..... The amount of wind in your face is directly proportional to the pleasure received....

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  • PatrickGSR94
    replied
    well considering with pedaling I was averaging about 9 mph with this bike, and on my road bike I can only average 12-13 mph usually, my 14.5+ average on this bike is pretty good. I still like to get a workout when riding, since this is pretty much the only exercise I get. I've been riding around 3,500 miles a year on non-powered bikes the past 4 years or so, mostly commuting. My goal is to add to that total with this bike, not replace any of the road bike riding I was doing before.

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  • Gr8fun
    replied
    With a bunch of assumptions, you are getting 14 watt hours per mile. That is for 50 volts and 31 5 miles. Assuming your full battery was 58.8 volts. Assuming 51.5 is half capacity assiming you waited an hour before reading voltage to allow for balancing. That shut off is at 43. Since you have 50.7 volts left you are doing better. I do not have the patience nor the strength to pedal that much or go that slow. The 51.5 was on a chart i saw but can no longer find.
    As the battery drops your voltage sag will drop you out under acceleration and high speed. Never get the full use from battery due to sag. Much less is available at lower voltage. I always rechargevbefore 47.
    Get a batt man or at a minimum a watt hour gauge. I played with these numbers before i got the batt man. Reasonably accurate.

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  • PatrickGSR94
    replied
    41 miles right now with 48.5 volts showing. I think I'll call it and throw the battery on the charger now, as I'm planning on doing the 31 mile round trip commute tomorrow.

    I've been riding primarily with PAS 1 and 2 out of 5 settings, and switching to 0 on larger downhill sections and just pedaling. I generally only use the throttle for a few seconds to help get going from a stop, usually in gear 3.

    I'm running the stock 44t Bafang chain ring currently, with a 11-28 8-speed cassette using primarily gears 3, 4, 5 and 6. Chainline on 3rd gear is terrible, so I'm planning on shifting the 7th and 8th cogs to the inside of the cassette and adjusting the RD to have 6 usable gears instead of 8. I'm planning on getting the Lekkie 42t ring later, and will re-visit chainline at that time to see if I can use more of the gears efficiently.
    Last edited by PatrickGSR94; 03-19-2017, 01:45 PM.

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  • OptimusPrime
    replied
    This is a great test, I can't wait to see what your final distance is!

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  • Gr8fun
    replied
    You are doing more than exercising your thumb. What size chain ring? Which cog. Speed? I have noticed little difference when i pull trailer. Weight not as much of a handicap as speed. But using lower gears much more important.

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