Two points come to mind...
1. DC to DC converters are getting smaller, cheaper, and less expensive year by year.
2. Some types of Lithium batteries can be very dangerous if mishandled. Using a "smart battery" type design lets the design engineers protect the battery from clueless users thereby possibly avoiding law suits. (This, of course, can frustrate users who do understand). Regardless, expect more of this kind of design as time goes on.
Pat
--- In electricboats@yahoogroups.com, "Steve" <sstuller@...> wrote:
>
>
>
> 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.
>
> --- In electricboats@yahoogroups.com, "Mark n Angela" <mstafford@> wrote:
> >
> > Steve S.,
> >
> > Thanks for trying to clear up any confusion. Unfortunately, you are mistaken: plug a 12v house battery directly into the 29.6v Torqeedo 1003, and you get magic charging. The Torqeedo battery pack incorporates it's own charge control computer. The "charger" that comes with the motor from the factory, is just a 12v power supply, 4A. In other words, Torqeedo went with "smart batteries" and "dumb chargers".
> >
> > Apparently included in the "smart battery" computer is several charging source sensitivities:
> > 1. if charging from a solar panel, it allows "solar chargers with a voltage between 24 V and 60 V and a charging current of 4 Amps max" (http://www.torqeedo.com/us/hn/products/travel-503-1003/details-travel-5031003.html)
> > 2. charge from 100-240v 50-60Hz AC with the supplied "charger" (12v power supply).
> > 3. if charging directly from "house" 12v bank, someone on this list found it only charges at 1 Amp, to avoid draining the house battery. I suspect if the house battery was being charged (voltage above 13.2 volts or some number), the Torqeedo "smart battery" internal charger would take the whole 4amps at 12v. I will experiment later.
> > 4. Torqeedo recommends using an inverter from a house bank to get AC, then using the Torqeedo supplied "charger" (12v power supply). This is probably to avoid mad customers... inverters shut off when the house battery is getting low, but maybe the Torqeedo battery would continue to suck from a low house bank, possibly harming the batteries. I don't know.
> >
> > Thanks again for trying,
> > Mark Stafford
>
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