[Linux-aus] ArkPak 12V/240V Battery Box hacks

[Owen Mace]

Some good ideas here, but modelling lead-acid batteries is not simple.  Have a 
look at http://en.wikipedia.org/wiki/Peukert%27s_law and note the qualification 
that Peukert doesn't take battery temperature into account.

Cheers

Owen

On Mon, 13 Jan 2014 09:41:24 AM Kevin Maciunas wrote:
> On 13/01/14 09:21, Peter Lawler wrote:
> >> The cheapest source of suitable widgets
> >> is probably the Arduino form factor kit - the ATMega controllers are
> >> 12bit analogue which is probably enough to figure depth of discharge.
> > 
> > Top idea, 99! I blame poor coffee for not thinking of that earlier
> > (*see above)
> > 
> > Thanks, greatly appreciated :)
> > 
> > 
> > Pete.
> 
> Since the inverter is in the "toy" category - only 150Watts - rather
> than lots of kVA check out the hall effect current devices.  You can use
> a trivial resistive divider for the volts, but the current is a bit more
> problematic.  150W means it is going to be under 30A - so the simple
> widgets that companies like Pololu make that use the ACS714 hall effect
> current sensor would work.
> 
> You could go buy one of those and a Freetronics Arduino board and you're
> basically good to go and it is all plug and play :)  Which is nice -
> almost no soldering!!! :)
> 
> /Kevin