Model Boat Mayhem

Technical, Techniques, Hints, and Tips => Batteries & Chargers => Topic started by: lakeshore on June 22, 2012, 05:51:03 pm

Title: Parrallel Batteries
Post by: lakeshore on June 22, 2012, 05:51:03 pm

Hi

just wondering about the pro's and cons of fitting two 7.2v batteries wired in parrallel to drive a single 6-9v motor through mtroniks 20amp viper marine and Bec.

Cheers
John.

Title: Re: Parrallel Batteries
Post by: gwa84the2nd on June 22, 2012, 05:56:55 pm

basikly pro's more run time cons bit more weight  :-))

Title: Re: Parrallel Batteries
Post by: lakeshore on June 22, 2012, 07:26:45 pm

Not really bothered about weight issue got plenty of room.More interested in runtime.
(http://s11.postimage.org/6smrdllf3/621a.jpg) (http://postimage.org/image/6smrdllf3/)

(http://s13.postimage.org/md962wwtv/619a.jpg) (http://postimage.org/image/md962wwtv/)

Title: Re: Parrallel Batteries
Post by: Norseman on June 22, 2012, 08:16:31 pm

Yes you might as well make the ballast work for you, and you can get the run time you want too.
I had this recommended to me recently by someone I trust http://www.electronize.co.uk/fr30_series.htm and I'm told they can be repaired too, whereas some others are throwaway. This was posted up recently too http://www.howesmodels.co.uk/RadioControl/viewProduct.php?ProdID=5695. I'm sure someone here will advise you of the best buys when you have the motor and prop info to hand. There are some bad buys out there too that can burn your boat so it's good policy to ask first buy later.

Dave

Title: Re: Parrallel Batteries
Post by: malcolmfrary on June 22, 2012, 09:45:43 pm

And of course ACTion have a module for connecting two batteries in a safe and tidy manner - theres a recent thread about that somewhere near.

Title: Re: Parrallel Batteries
Post by: pettyofficernick on June 22, 2012, 10:27:58 pm

Hi John, Use the ACTion P103 parallel power board, I am in the middle of installing one this very minute.
http://www.action-electronics.co.uk/pat.php
Regards,
Nick. :-)) :-)) :-))

Title: Re: Parrallel Batteries
Post by: tobyker on June 22, 2012, 11:11:24 pm

I like that hull.

Title: Re: Parrallel Batteries
Post by: Norseman on June 23, 2012, 12:52:19 am

Guy on ebay has them plus other stuff
http://www.ebay.co.uk/sch/nicks7015/m.html?hash=item2ebc344802&item=200726038530&pt=UK_ToysGames_RadioControlled_JN&rt=nc&_trksid=p4340.l2562

Dave

Title: Re: Parrallel Batteries
Post by: lakeshore on June 23, 2012, 06:00:45 am

Thank's for the link Nick.

Title: Re: Parrallel Batteries
Post by: Niall on June 23, 2012, 10:53:20 am

It is dangerous to attach rechargeble batteries in parrallel.

If 1 cell in 1 battery fails the other battery will discharge into it, which will almost certainly cause a fire.

I don't know if the products other people have posted will protect against this problem.

Title: Re: Parrallel Batteries
Post by: petermun on June 23, 2012, 11:17:00 am

Dave, I know the answer, but better coming from you.  Pete

Title: Re: Parrallel Batteries
Post by: ACTion on June 23, 2012, 11:37:02 am

Quote from: Niall on June 23, 2012, 10:53:20 am

I don't know if the products other people have posted will protect against this problem.

P103 is specifically designed to prevent this. (Pete - you were right!)
DM

Title: Re: Parrallel Batteries
Post by: pettyofficernick on June 23, 2012, 06:52:32 pm

Hello John, Here's a photo of the P(% I fitted last night, there is more on my Bugsier 3 build, where you will be able to see the complete layout.
Regards,
Nick. :-)) :-)) :-))

(http://s9.postimage.org/ark27o6sr/Power_Board.jpg) (http://postimage.org/image/ark27o6sr/)

Title: Re: Parrallel Batteries
Post by: lakeshore on June 24, 2012, 07:20:20 am

Cheers Nick will certainly take a look.

John.