I've also been told by a tech at Dual Pro that my quad charger will begin to power back after an hour of high charging (as when I'm running the electric motor in conjunction with our honda eu2000 for extended motoring) due to heating issues. He told me that the Dual Pro Quad 15 was not rated as a "power supply" for this reason, which is what I need in order to use the gen set to run the motor through the battery charger for extended cruising.
hth,
Stephen Study s/v Hard a-Glee, 1977 Islander 36
To: electricboats@yahoogroups.com
From: todd@rumblecity.com
Date: Thu, 4 Mar 2010 14:10:12 +0000
Subject: [Electric Boats] Re: Battery charger limits and the Honda 2000 generator
Stephen Study s/v Hard a-Glee, 1977 Islander 36
To: electricboats@
From: todd@rumblecity.
Date: Thu, 4 Mar 2010 14:10:12 +0000
Subject: [Electric Boats] Re: Battery charger limits and the Honda 2000 generator
This idea of a 'serial hybrid' (genny-2-charger-2-batts-2-motor) certainly works and has it's benefits. But realize that many of these high-tech smart chargers have sophisticated algorithms in their firmware that factor 'time of recovery' as part of their computations. So for instance even a deeply discharged bank should get up to optimum bulk charge voltage (let's use 14.7 volts/12 volt battery for example) in a certain period of time.
When you add the load of the motor into this equation the firmware is now wondering why it can't attain that pre-programed bulk charge voltage in a given period of time, and may shut down thinking that there is a problem with the battery bank itself.
I would guess that most chargers could handle short periods of use in this way, but extended runs might be a problem.
Capt. Todd
www.epowermarine.com
--- In electricboats@yahoogroups.com , "aweekdaysailor" <aweekdaysailor@...> wrote:
>
> In practice, you run the generator/charger in parallel with the batteries -- not waiting for them to run down below comfort. Now you are drawing say...10amps from the batteries (which they like) and another 20 from the charger - 30 amps gets me almost 4 knots.
>
> I'm not sure the long-term effects of this on either charger or battery though...
>
> -Keith
>
> --- In electricboats@yahoogroups.com , Hans Kloepfer <hanskloepfer@> wrote:
> >
> > Dave H.
> >
> > For what it is worth I am pretty sure that you can get at least 2 knots at .750kW. People get 1.2 knts with sculling oars. The key is a clean bottom and prop. I just got my bottom and prop cleaned and it was a dramatic performance nudge. I got 3 knots at 1kW. Of course this is only in dead calm water in the marina. This is the first time I was able to monitor my performance so well because I recently installed a new meter.
>
When you add the load of the motor into this equation the firmware is now wondering why it can't attain that pre-programed bulk charge voltage in a given period of time, and may shut down thinking that there is a problem with the battery bank itself.
I would guess that most chargers could handle short periods of use in this way, but extended runs might be a problem.
Capt. Todd
www.epowermarine.
--- In electricboats@
>
> In practice, you run the generator/charger in parallel with the batteries -- not waiting for them to run down below comfort. Now you are drawing say...10amps from the batteries (which they like) and another 20 from the charger - 30 amps gets me almost 4 knots.
>
> I'm not sure the long-term effects of this on either charger or battery though...
>
> -Keith
>
> --- In electricboats@
> >
> > Dave H.
> >
> > For what it is worth I am pretty sure that you can get at least 2 knots at .750kW. People get 1.2 knts with sculling oars. The key is a clean bottom and prop. I just got my bottom and prop cleaned and it was a dramatic performance nudge. I got 3 knots at 1kW. Of course this is only in dead calm water in the marina. This is the first time I was able to monitor my performance so well because I recently installed a new meter.
>
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