Generally, the low voltage is set as 2.0V/cell or 8.0V/pack for high power
LFP and 2.5V/cell or 10.0V/pack for energy type LFP. Since we're using the
lithium batteries for ourselves, so you can measure the voltages of the
cells periodically. I have only one suggestion that, you'd better measure
the charging current from your alternator and be sure that your lithium
battery is capable for taking that current. Generally, the peak charging
current ranges from 200A-500A. Ideally, choose a LFP battery with 1/3 or
1/4 of the original lead acid battery. Of course, if you like to consume
too much electricity when engine is off, you'd better use bigger LFP
battery.
Jerry
On Fri, Feb 15, 2013 at 2:12 PM, Bruce EVangel Parmenter <
[email protected]> wrote:
> Thanks Jerry for your response.
> Now, there are Low Voltage Disconnect circuits that I could add that
> would break the circuit at a set voltage. But the disconnect voltage on
> most of them are likely set for use with PbSO4 batteries.
>
> -What voltage would be a good disconnect voltage set point for that 12V
> Li-ion drop in battery? What voltage would prevent draining the Li-ion
> battery too low causing damage?
>
>
> {brucedp.150m.com}
>
>
> -
> On Thu, Feb 14, 2013, at 09:38 PM, Jerry Yue wrote:
> > Sure, it will be ok to use the lithium battery on your car. I used a 12V
> > lithium battery without bms on a SUV in 2008. It lasted half an year
> > before
> > it failed due to two times of over-discharge (I forgot to close
> > headlamps).
> >
> > On Fri, Feb 15, 2013 at 1:32 PM, Bruce EVangel Parmenter <
> > [email protected]> wrote:
> >
> > > Ah Ha! That is what I saw in the back of the J.B. Straubel's Porsche
> > > conversion when I followed him using his pusher trailer to his home
> > > (many years ago). The pack just behind the front seats and had little
> > > light dimly lights between the cells. So, that was the BMS he used in
> > > his EV conversion design ... neat!
> > >
> > > ...
> > > OK, no one has posted about one of my queries as to if the prepackaged
> > > 12V Li-ion battery that would drop as a replacement to my dying 12V
> > > group-24 deep cycle. So, I will assume there is no problem trying one.
> > >
> > >
> > > {brucedp.150m.com}
> -
>
> --
> http://www.fastmail.fm - Or how I learned to stop worrying and
> love email again
>
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