Batteries?

[Noah Van Bramer]

I'm looking for a 36 volt battery system, but I don't want to use car batteries if I don't have to because they are super heavy, does anyone have an alternative?

[Pete Prodoehl]

Use UPS batteries?


Pete

> --

[Patrick Callahan]

Motorcycle or riding lawnmower batteries work well too.

--
You received this message because you are subscribed to the Google Groups "Power Racing Series" group.
To unsubscribe from this group and stop receiving emails from it, send an email to power-racing-se...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[macma...@comcast.net]

something like this should work reasonably well

http://www.andymark.com/power-patrol-sla1116-12-volt-18ah-batteries-2-pack-p/am-3062.htm

[Tom Gralewicz]

Although Milwaukee Makerspace has used these for a number of years they don't work out very well.

You first problem is you need to de-rate these pretty severly when you draw them at less that 1/20 C

(C is the capacity of the battery 18AH and that number is assuming you discharge them over 20 hours, so a discharge rate of 0.9A)

If you look at the data sheet you only get 9.8AH if you discharge it in 1 hour and even less in a 15 minute race.

On a 36V car drawing 1440W you expect to see 40A, the reality is you will regularly draw more than twice that without blowing the fuse.

The data sheet says the battery will last 5 min at 73A.

The second problem is the abuse we subject them to means they rarely last more than a season or two.

This type of battery is certainly the safest and easiest to use for Power Wheels and on the surface the cheapest.  But to make a car that can last a 15 minute race, much less an endurance you should be looking at batteries at least twice this AH, and you'll need at least 3 sets to run the enduro.

https://www.walmart.com/ip/New-12V-35Ah-AGM-Sealed-Lead-Acid-Battery-UB12350-Group-U1-Free-Shipping/168009742?wmlspartner=wlpa&selectedSellerId=1082&adid=22222222227049638337&wmlspartner=wmtlabs&wl0=&wl1=g&wl2=c&wl3=147422199732&wl4=pla-261322901009&wl5=9018845&wl6=&wl7=&wl8=&wl9=pla&wl10=112561763&wl11=online&wl12=168009742&wl13=&veh=sem

These are getting heavier and shipping can become an issue, I usually find a local battery distributor, tell them what we are doing and show them some videos.  You might get them to sell you the batteries at a commercial discount if you spread their name around.

Tom

Tom Gralewicz

Chronic Maker

(414) 380-1716

milwaukeemakerspace.org

--

You received this message because you are subscribed to the Google Groups "Power Racing Series" group.

To unsubscribe from this group and stop receiving emails from it, send an email to power-racing-series+unsub...@googlegroups.com.