I don't mean to pick on you today, but I don't think your interpretation of the Kill-A-Watt is correct. The meter reads real power and has already taken the power factor into account. In your example, 80 watts is going into the battery (or is being lost in the charger). The poor power factor (which is very common in switching power supplies) just means the current being drawn from the AC line is higher than that wattage would indicate. In other words, if you measure voltage and current using a multimeter and multiply them the answer will be quite a bit bigger than those 80 watts that are actually being used. ...Pat
--- In electricboats@yahoogroups.com, "Steve" <sstuller@...> wrote:
>
>
>
>
> Fair enough. I accept defeat. If you want to try something interesting plug the charger into a Kill-A-Watt meter while charging the lithium battery. When I did this with the charger for the 801's lithium battery the apparent power was about 80 watts but there was a power factor of 50% so the battery was only getting about 40 watts. Thanks. Steve S.
>
> --- In electricboats@yahoogroups.com, "Ed Bachmann edbz" <edbz@> wrote:
> >
> > This is what my charger for a Torqeedo 1003 has written on the back:
> >
> > EDac EDACPOWER ELEC.
> > AC ADAPTER
> > MODEL EA10522D-120
> > AC INPUT 100-240V ~ 1.8A, 50-60Hz
> > DC OUTPUT 12V â€" 4.16A
> > FOR INDOOR USE ONLY
> > I.T.E USE ONLY
> > UL LISTED I.T.E. POWER SUPPLY, (plus more certifications)
> > MADE IN CHINA
> >
> > (Note: I.T.E. = information technology equipment. Basically refers to a set of safety and other standards for a class of devices.)
> >
> > From: Steve
> > Sent: Tuesday, May 10, 2011 12:20 PM
> > To: electricboats@yahoogroups.com
> > Subject: [Electric Boats] Re: Torqeedo stops production of the Travel 401 and 801 models.
> >
> > Assuming you are correct about the charger supplying 12 volts DC then there must be a DC/DC converter built into the lithium battery pack to boost the 12 volts DC to 30+ volts DC. Why Torqeedo would think this is a better idea than using an AC/DC converter with an output of 40 volts DC re the charger that came with the 801 escapes me. Also you still need an inverter if you want to use 12 volt boat battery with the charger.
> >
>
No comments:
Post a Comment