Search found 108 matches

by hohisilver
Sat Sep 10, 2011 5:57 pm
Forum: All things battery related
Topic: Duff/weak cell?
Replies: 47
Views: 52927

Re: Duff/weak cell?

Finally got around to replacing those (potentially) duff cells yesterday and tightened up the screws (there was a loose connection roughly where I expected). A few fireworks due to that damn single plate swinging round and shorting against adjacent cells :x Burnt my fingers a bit trying to swing it ...
by hohisilver
Wed Aug 24, 2011 11:51 am
Forum: Hot off the press....
Topic: MECC Manchester
Replies: 31
Views: 60784

Re: MECC Manchester

Come on lads, you know these here electric vehicles are just a passing fad, just like the "motor car" ;)
by hohisilver
Mon Aug 22, 2011 5:17 pm
Forum: All things battery related
Topic: Duff/weak cell?
Replies: 47
Views: 52927

Re: Duff/weak cell?

That was also going through my mind - if they are both duff could it just be coincidence or has one cell taken out its partner over time?
by hohisilver
Sun Aug 21, 2011 9:17 pm
Forum: BMS thread
Topic: Old BMS Software Thread
Replies: 600
Views: 359319

Re: Old BMS Software Thread

While my scooter's off the road I've got plenty of opportunity to experiment so I've been tweaking my code for the PIC18F2680, and this evening I finally have it (basically) running :D

It now uses 21.3% of program space and 18.3% data space, so plenty of room for more development!
by hohisilver
Sat Aug 20, 2011 9:39 pm
Forum: All things battery related
Topic: Duff/weak cell?
Replies: 47
Views: 52927

Re: Duff/weak cell?

Of course as Beemer pointed out the problem could be a false reading from the bms. Use a volt meter to confirm the cell readings, being careful of course as working on pack voltages can be lethal. I see what you mean now about loose connections, I had only considered how it might affect the voltage...
by hohisilver
Sat Aug 20, 2011 1:58 pm
Forum: All things battery related
Topic: Duff/weak cell?
Replies: 47
Views: 52927

Re: Duff/weak cell?

Thanks guys, I didn't think a loose connection would cause such rapid charge/discharge, no doubt I will find out in a couple of weeks. At least they are screw tab Headways so (subject to sourcing a new cell or two) replacing won't be too difficult. The BMS is 25 on a board so no chance of swapping t...
by hohisilver
Thu Aug 18, 2011 8:53 pm
Forum: All things battery related
Topic: Duff/weak cell?
Replies: 47
Views: 52927

Re: Duff/weak cell?

Still haven't had a chance to take the pack out to check that connection, but I haven't used the scooter for over a week now because it was dropping badly (I had it cut the controller after only 2 miles :shock: ). So I thought this evening I'd just give the pack a quick boost charge, and it was cert...
by hohisilver
Mon Aug 08, 2011 1:35 pm
Forum: Hot off the press....
Topic: Top Gear and Radio 2
Replies: 5
Views: 20166

Re: Top Gear and Radio 2

The problem with this sort of "larking about" is that a) fans of the programme think it's acceptable to emulate it, and b) that the "factual" element must be true 'cos it's on the telly. :roll:
by hohisilver
Sat Aug 06, 2011 1:40 pm
Forum: BMS thread
Topic: Old BMS Software Thread
Replies: 600
Views: 359319

Re: Old BMS Software Thread

Also had a bit of a beer and brainwaving session last night and I've abandoned the USB idea as I've discovered the PIC18F2680 which has even more program space (32K words) and RAM (over 3K). The only trouble with the "beer" part is that I find I end up buying stuff online! :lol: So I've or...
by hohisilver
Fri Aug 05, 2011 7:14 pm
Forum: BMS thread
Topic: Old BMS Software Thread
Replies: 600
Views: 359319

Re: Old BMS Software Thread

Ok, first of all the pic: http://s4.imagestime.com/out.php/i584245_IMGP1183.jpg As you can see I've got it displaying the pack/max/min voltages on the first line, and temp/current/SOC on the bottom. This is updated in one second intervals - I was having problems with data corruption so I added a che...

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