indianajo
Well-Known Member
I finally got my battery, shipped to a friend near my summer camp, home to maintenance base. 48 v 15 AH, should put out 3 amps for 5 hours. Display been blanking out on me after 13 miles at 10 mph, Battery reads okay (>55 v) shortly afterwards with meter but didn't have meter hooked up during failure. I have to watch the road when riding, not a meter. You can't plan the outage to be at a time when you are looking at the meter.
So I hooked up three 5 ohm 200 W resistors in series to make a 4 amp load at 58 v, the charger cutoff voltage. Put a meter in parallel. See picture.
Battery is in silver frame lower right to be bolted securely to the bike.
Bought resistors (dark brown) from surplus house for $6 each to test PA amplifiers with. Any 15 ohm 200 W setup could work, even an assemblage of 5 watt resistors. See diyaudio.com for details on building amp test load bank.
Charge the battery, connect to resistors, flip the switch, the battery collapses to 18v. Fail.
31 day warranty via e-bay expired summer 2017. In sun-ebike favor, I did store the battery eight feet underground in a tornado shelter during the winter, which got down to -8 deg F. That could have been the problem. I still suspect the infamous level of quality from a country I usually don't buy from may also have been the problem. All ebike parts come that country, IMHO.
So I'm out $320. Still way cheaper than a branded bike, that no model in a show room will fit me. See the thread begging for a demonstration of a 17" frame Stromer in stock under buy and sell forum . That frame might fit me, but you have to pay for it before you can try it out. ***** them. I'll build something on a frame I know, heavy steel so I don't bend it with a motor in it. Next battery is a Luna, getting shipped to my city maintenance base and will be tested the first week before installation.
So I hooked up three 5 ohm 200 W resistors in series to make a 4 amp load at 58 v, the charger cutoff voltage. Put a meter in parallel. See picture.
Battery is in silver frame lower right to be bolted securely to the bike. Bought resistors (dark brown) from surplus house for $6 each to test PA amplifiers with. Any 15 ohm 200 W setup could work, even an assemblage of 5 watt resistors. See diyaudio.com for details on building amp test load bank.
Charge the battery, connect to resistors, flip the switch, the battery collapses to 18v. Fail.
31 day warranty via e-bay expired summer 2017. In sun-ebike favor, I did store the battery eight feet underground in a tornado shelter during the winter, which got down to -8 deg F. That could have been the problem. I still suspect the infamous level of quality from a country I usually don't buy from may also have been the problem. All ebike parts come that country, IMHO.
So I'm out $320. Still way cheaper than a branded bike, that no model in a show room will fit me. See the thread begging for a demonstration of a 17" frame Stromer in stock under buy and sell forum . That frame might fit me, but you have to pay for it before you can try it out. ***** them. I'll build something on a frame I know, heavy steel so I don't bend it with a motor in it. Next battery is a Luna, getting shipped to my city maintenance base and will be tested the first week before installation.
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