Battery Chargers

[GLJoe]

Hang on and with respect which of us has actually lectured on electronic power supply design? .

So are you trying to claim some superiority because you have lectured on electronic power supply design?


And have you actually designed power supplies for the real world rather than just talk about them?

The 4amp Bosch charger which I have is well suited for its function and is probably made on a long established line. When the requirement for a more portable unit arose they would have gone with a more modern design. Lighter etc but with probably more expensive components.

"Probably". Have any evidence for that? How do you know the 2A charger also wasn't made on a 'long established line'. And if they managed to make it smaller and lighter by using 'more expensive components', why is it significantly CHEAPER and not MORE EXPENSIVE ??

 

[Danidl]

So are you trying to claim some superiority because you have lectured on electronic power supply design?


And have you actually designed power supplies for the real world rather than just talk about them?



"Probably". Have any evidence for that? How do you know the 2A charger also wasn't made on a 'long established line'. And if they managed to make it smaller and lighter by using 'more expensive components', why is it significantly CHEAPER and not MORE EXPENSIVE ??

To your questions yes, yes and probably because I am disinclined to open up a perfectly good and operational unit to definitely answer your question.

 

[spanos]

One of the reasons I use LiPo, 58 minutes to fully charge 10 Ah, under 2 hours (a continental lunch break) to charge 20 Ah.

Which lipo please ? I have become disillusion with Hk multistar longevity. Been using them for about two years....and replaced two of four in that time

My Jimmy at bga pack runs and runs...no loss of capacity after two years of nearly daily rising. At least nothing discernable

 

[anotherkiwi]

Graphene, I gave up on Multistar too. Unfortunately (for me) there are 12 Ah 6S on sale at 50% off in the UK warehouse at the moment and I can't buy from there... 264 € for a 21 Ah battery...

 

[spanos]

Graphene, I gave up on Multistar too. Unfortunately (for me) there are 12 Ah 6S on sale at 50% off in the UK warehouse at the moment and I can't buy from there... 264 € for a 21 Ah battery...

Thanks for that, I'll keep in mind but I suspect my. Lipo days are over now 18650 capacities are so much higher than a few years back.

 

[anotherkiwi]

The only advantage I see to 18650 is weight* at about 2/3 of the equivalent energy density in LiPo. Advantage to LiPo is charging time of about 1 hour at 1C and you can charge off grid more easily which may not be important where you live but I have a place to go to off grid

It is easier to assemble specific LiPo packs into different power batteries for different needs, with 18650 you can parallel but not play with voltage by changing the number of cells in series. Unless you use a LiPo pack...

Case study DIY battery you can't buy off the shelf:

HL battery case - 32.80 €
48 NCR PF - 223.90 € (with nickel strip)
BMS - 15.30 €

2800 gram 4P12S 12 Ah 43.2 V battery total - 272 €
I haven't counted charger, welder etc.

Graphene 2 x 12 Ah 6S - 256.50 €
Serial cable - 4 €
Bag - 11.50...

4078 gram 12S 12 Ah (nominative**) 44.4 V battery - 272 €

* Battery weight is less important to me than some who have 1.2 kg of accessories on their bike, they have to cut back somewhere
**The LiPo is going to give about 10.8 Ah when used with long life in mind - charged to 4.15 V and discharged to 3.65 V per cell. It will give 12 Ah when used in the 4.2 to 3.3 V range.

 

[Danidl]

So are you trying to claim some superiority because you have lectured on electronic power supply design?


And have you actually designed power supplies for the real world rather than just talk about them?



"Probably". Have any evidence for that? How do you know the 2A charger also wasn't made on a 'long established line'. And if they managed to make it smaller and lighter by using 'more expensive components', why is it significantly CHEAPER and not MORE EXPENSIVE ??

Just took the opportunity to look at the specs for both on the Bosch website. The 4amp charger is listed as silent and working at a fixed input voltage 220 230 v . This implies that it is a traditional linear power supply of a design which is 50 plus years old. Simple, robust and with a heavier transformer.
The 2amp charger is not listed as silent and has almost universal input voltages 110 and 220v . This implies that it is of the more modern switch mode type and may give off a whistle from its transformer when in use.

The cost of an item to the consumer does not necessarily reflect the manufacturing cost."Are you familiar with the term. " what the market will bear "
Does that answer you fully?