16719Re: I have lithium LiFePO4!
- Mar 8, 2010Hello Danny,
Thanks for reacting to my questions!
Anyone considered using fuel cells? The only reference on the forum is this one:
There are fuel cells for mobil homes and the like, but they cost as much as a robomower, are too big and supply only 12 Volts, (the professional does 24 Volts, but it is Big Size!
Also came across this one:
Nice for your Nokia but I don't see it powering Robomowie.
--- In RoboMower@yahoogroups.com, "Frans" <voorde@...> wrote:
> Don't I LOVE abbreviations!!!!
> BMS = Battery Management System (???) which in my humble opinion is a posh word for controller.
> Will the BMS effectively fool the Robomower electronics into thinking this is a Gel type lead battery fit for Deep Discharge. Or do you have to charge outside Robomow? In that case the docking feature becomes inoperabele, which is a big disadvantage IMHO.
> If you can not fit in 40Ah, why not 30Ah? Can you explain about "but the math says no"? - reminds me of Little Britain! What will be your typical charging time? From what I saw on RC cars and airplanes in the order of 10 minutes? That would somewhat do away the docking station issue, I think.
> Last but not least the cost an how long are they projected to last?
> Where did you buy them?
> Frans the Stationmaster
> --- In RoboMower@yahoogroups.com, Danny Miller <dannym@> wrote:
> > Ha just got in some 20AH LiFePO4 cells to build a battery...
> > this should be fun.
> > I need to design and build a decent BMS. This is no small task...
> > there's a lot of crappy BMS's out there, I wanna do one properly.
> > Wow, there actually is a lot of extra volume here in the pack! Well, no
> > shortage of room for a BMS. I did look to see if I'd be able to double
> > up the cells and make a 40AH pack, but the math says no.
> > Danny
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