Battery amps

I am currently running 2 x 17 amp sla for 24v
but they weigh 12kg, so I am thinking about
changing to 36v bot packs.
How many amps on average does a h/w robot use
per fight ????????
I suppose 3.3ah will never be enough?

We normally use 4Ah on easy days but have used anywhere up to 12-16Ah during a full fight.

In Turbulence we just about get away with 6amp battlepacks and thats with Boschs on 24v running 10 wheels on a very high gear ratio. Most people play it safe and go for 9amp though.

After looking to your website, I dare to say that you perfectly can survive on 4 12V 38mAh
NiMH packs (current sub C pack) . These are standard packs,not too expensive, by the firm Hopf in Germany.

mario, its not 38mah but 3800 mah / 3.8 ah. That would be the IB3800 NiMh cells, at 72 euro per 18 cells. so 2.7 pound a cell

http://www.neumotors.com/store.htmlhttp://www.neumotors.com/store.html has them cheaper at 1.6 pound a cell, but theyre USA

Right now i have 11.1 Ah @ 36V MiMh (3x30 cells). With Nicads you can have higher discharges so you might get away with 9Ah.

I didnt want to risk it on 7.4Ah. It still saved me 10 kgs. :)

In THz, in 3 minute fights, we often use only 3Ah per fight. But sometimes it is as much as 6Ah. I would recommend 3 packs of Sanyo N-3000CR C cells, due to their low internal resistance (3.4 mOhm per cell), which means high current delivery and the cells dont get too hot. Remember that with NiCads or NiMhs, it is usually current delivery that determines the number of packs to use, rather than capacity.

(Message edited by terrorhurtz on August 21, 2006)

Would have to back John here and reccomend the Sanyo N-3000CR C Cell. Storm II runs three sets and we can easily run through a 5 min fight.

See you in the arena Terry ;)

Ed
http://www.teamstorm.comhttp://www.teamstorm.com

For series 7 we used 2 Sanyo 2.4Ah packs in parrellel for the drive for our 400 Watt motors and bearly made it through 5 mins. Since then we used 3 packs in parrellel, but I would recommended the same as Ed and John, they weight more but are a much safer option and can give out more peak Amps when needed.

Cheers everyone,
well it looks like minimum is 3 x 3ah 36v packs,
not sure my budget can run to £500 and also buy new chargers, I wonder if you can buy Sanyo N-3000CR racing packs as ive seen 3.3ah 7.2v for £23 that was gp though, but they are alot cheaper.
Oh Ed, better not blink I normally get airtime in the arena so im not in it very long !!