Usually fuses are rated rather higher than the continuous current rating, i.e. for a 15A continuous controller more like 30/40A and for a 30A perhaps 50/60A - the fets can usually take at least twice the continuous rating for very short periods, it's longer periods that cause so much heating that damage can be done.
thanks. I will put another in-line fuse before the lifter motor but will I need a fuse anywhere else on the robot to comply with the build rules?
You need an inline fuse after the battery IF your using Li-Po's otherwise all other fusing is up to you!
Perfect. What rating should that be just as above, about 30amps?
looking awesome! actutor thing arrived today by the way
Depends on both the rating of the li-po pack (should match/be just under peak discharge capacity) and whether you want some more protection for your speed controllers (then you'd go for a smaller fuse, but run the risk of blowing this just through heavy loads/stalled motors).
Are you still using these http://cgi.ebay.co.uk/18-5v-2200MAH-45C ... 231019e093 as I noticed you'd posted earlier? - why two packs, surely simpler to use one?
jonny - glad the lifter arrived today. Hope its what you're after.
Ewan - yes I was thinking of using these. I was going to use two that would give me 4400mah one each side spreads the weight making it even either side. Plus two is a bit different.
OK fair enough if it's for weight distribution, you'll probably want to run them in parallel for easy charging? If so then let's give a conservative 25C peak discharge for them (being cheap) which equates to 110A (25 x 4.4Ah). For your robot (not a very big weapon motor, maximum drain will probably be from lifter motor near-stall) I'd say a 100A fuse would do fine and be ample protection for your batteries (and would most importantly trip if there's a power-circuit short). Could run even smaller if you're concerned about your speed controllers.
wow 100amp fuse now we're talking.lol
I will be running them in parallel for charging and 18.5v will be enough as they are 12v drill motors.
thanks for that I'll get a few ordered.
does anyone know where to get 100amp mini blade fuses?
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