Can anyone check my logic and calcs please...
I decided to upgrade from 36V 8.8Ah old style bottle battery to 36V 14.5Ah new style bottle battery because I need to travel longer distances.
So just got a 36V 14.5Ah Panasonic battery from China (reputable dealer but don’t want to say who at the moment). I fitted it to my bike but got the same old 30’ish miles out of it instead of 50’ish that I was expecting. So I charged it from flat via an energy monitor and found that it only takes 280Wh to charge.
I calculate that 280Wh at 36V is 7.77Ah.
And since you can’t get more out of a battery than you put in the battery output must be less than 7.77Ah due to charger inefficiency.
My other bottle batteries that are 36V 8.8Ah & supposedly Panasonic take over 300Wh to charge from flat. I calculate that 300Wh at 36V is 8.3Ah. So they are pretty much what I would expect for that size battery.
By my reckoning I’ve paid extra for the 14.5Ah Panasonic version but actually got nothing better than an old style 8.8Ah bottle battery – if that!
The question is have I been conned or did they accidentally put the wrong batteries in the battery box?
Any ideas?
I decided to upgrade from 36V 8.8Ah old style bottle battery to 36V 14.5Ah new style bottle battery because I need to travel longer distances.
So just got a 36V 14.5Ah Panasonic battery from China (reputable dealer but don’t want to say who at the moment). I fitted it to my bike but got the same old 30’ish miles out of it instead of 50’ish that I was expecting. So I charged it from flat via an energy monitor and found that it only takes 280Wh to charge.
I calculate that 280Wh at 36V is 7.77Ah.
And since you can’t get more out of a battery than you put in the battery output must be less than 7.77Ah due to charger inefficiency.
My other bottle batteries that are 36V 8.8Ah & supposedly Panasonic take over 300Wh to charge from flat. I calculate that 300Wh at 36V is 8.3Ah. So they are pretty much what I would expect for that size battery.
By my reckoning I’ve paid extra for the 14.5Ah Panasonic version but actually got nothing better than an old style 8.8Ah bottle battery – if that!
The question is have I been conned or did they accidentally put the wrong batteries in the battery box?
Any ideas?