Re: My new ping- lights on BMS not working
Posted: Thu Jan 06, 2011 7:33 pm
That's odd. Have you replaced like with like in terms of usable capacity, current delivery capability and voltage?
As I recall your bike was running on 48V SLAs of 28Ah, plus an additional pack of 48V 20Ah, giving you a total of 48V, 48Ah. I believe that you've now decided to replace this massive battery pack with a tiny 36V, 15Ah LiFePO4 pack. Did you REALLY expect that a pack that was around 20% lower in voltage, about 50% lower in effective capacity and maybe around 50% lower in maximum current output to perform the same?
Ping is meticulous with giving a recommended motor power for each battery type he sells; your 36V 15Ah pack is OK for a motor of up to 600W (this is clearly stated in his advert) and will not take kindly to being asked to deliver more than about 1.5 to 2 times the Ah capacity as a maximum for short periods, so 22 to 30A is as much as the pack will be happy delivering during peaks.
As I recall your bike has an 800W motor, so is 30% over the recommended power for the battery pack you've just bought. I take it you knew this when you decided to buy it, especially as you've had advice from us on this very subject. Back on 22nd June last year I gave you very specific advice regarding the 48V, 20A Ping pack you then were looking at then. I warned you very, very clearly that these battery packs didn't like operating at more than 1C continuous (which is 15A for your pack, or 585 watts at 39V).
You've had honest and forthright advice from a few of us on here about battery choices over a period of several months. We've been patient with your constant requests for advice, have put up with your abusive rants against all and sundry suppliers and rarely have we had any thanks from you for spending a considerable amount of our time trying to offer you help and advice.
I very much doubt that the Ping pack is a lemon, if it is I shall be very surprised given the excellent reputation these packs have. I very strongly suspect that you may have bought a pack that's too small for your needs, probably because you're a constantly moaning cheapskate with aspirations that exceed your available budget, and are now blaming the seller for its performance not meeting your inflated expectations.
Jeremy
As I recall your bike was running on 48V SLAs of 28Ah, plus an additional pack of 48V 20Ah, giving you a total of 48V, 48Ah. I believe that you've now decided to replace this massive battery pack with a tiny 36V, 15Ah LiFePO4 pack. Did you REALLY expect that a pack that was around 20% lower in voltage, about 50% lower in effective capacity and maybe around 50% lower in maximum current output to perform the same?
Ping is meticulous with giving a recommended motor power for each battery type he sells; your 36V 15Ah pack is OK for a motor of up to 600W (this is clearly stated in his advert) and will not take kindly to being asked to deliver more than about 1.5 to 2 times the Ah capacity as a maximum for short periods, so 22 to 30A is as much as the pack will be happy delivering during peaks.
As I recall your bike has an 800W motor, so is 30% over the recommended power for the battery pack you've just bought. I take it you knew this when you decided to buy it, especially as you've had advice from us on this very subject. Back on 22nd June last year I gave you very specific advice regarding the 48V, 20A Ping pack you then were looking at then. I warned you very, very clearly that these battery packs didn't like operating at more than 1C continuous (which is 15A for your pack, or 585 watts at 39V).
You've had honest and forthright advice from a few of us on here about battery choices over a period of several months. We've been patient with your constant requests for advice, have put up with your abusive rants against all and sundry suppliers and rarely have we had any thanks from you for spending a considerable amount of our time trying to offer you help and advice.
I very much doubt that the Ping pack is a lemon, if it is I shall be very surprised given the excellent reputation these packs have. I very strongly suspect that you may have bought a pack that's too small for your needs, probably because you're a constantly moaning cheapskate with aspirations that exceed your available budget, and are now blaming the seller for its performance not meeting your inflated expectations.
Jeremy