With a 48 volt setup, you want all the batteries to be of the same type and state of charge. So, you would need 4 extra batteries to have a useful backup.
However, running on full throttle draws many many times the current of going slow. Discharged batteries can still provide a small amount of current. So again, if you run out, shut everything off, turn it back on, and then trying moving at a very slow speed. You might be surprised how far you can go. Think of it as "limp home" mode. If you try going faster, the controller will just shut it down again.
Pat
--- In electricboats@yahoogroups.com, "amracel" <amracel@...> wrote:
>
> The batteries are set up in series; it's a 48V motor.
>
> We put the throttle on full and the motor kept going for about 1/2 an hour. After that, it just stopped. So I'm sure the batteries were down to zilch. Unfortunately, we still had a little ways to go.
>
> What about buying one more AGM, moving it in and out of the series to keep it charging/discharging, then just hooking it in in cases of emergency?
>
> To also add to the equation, I got a charger that can't be connected when the engine is running (info based on wisdom gathered from this group). So, even if I'd had a generator along to recharge the batteries, we'd either be anchoring for a bit or hoping the wind was blowing at that point to keep us moving.
>
> --- In electricboats@yahoogroups.com, "greenpjs04" <forums@> wrote:
> >
> > Hi Anne,
> > You didn't say how your system is setup. Most people with 4 AGMs have them in series thereby providing 48 volts. If that is your case, there is no way to connect your 12 volt house batteries. You wouldn't want to mix batteries of different chemistries and different states of charge. If however, you have a 12 Volt motor with the 4 AGMs in parallel, you might be able to do something.
> >
> > Before trying any of that, though, keep in mind that when your controller says the batteries are empty, they might still have enough juice to get you home. Reset the system and travel as slow as possible.
> >
> > Pat
>
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