Mark,
Brian is talking about running an AGM bank and a Lithium bank. Because of the different charging requirements in voltage and current, they will need separate chargers. Each charger would be wired directly to its pack.
The suggested contactors were to keep the battey packs isolated from each other. Because the batteries are so different, I would not recommend any connection between them while charging, motoring or really any other time. Using a simple on-off-on switch to drive the contactors, you could select between them with no chance of linking them together. Two packs of the same battery type can be wired more simply.
PakTrakr is a great way to monitor voltages and one can pick a single place to monitor instantaneous current with their optional hall sensor. But if you wanted to run a "fuel gauge" battery monitor that will keep track of all energy in and out of the batteries, like the E-xpert Pro or the discontinued Link 10, there is no single place to catch all of the current flowing in and out of both battery packs. The multi-chargers like the Dual Pro and ProMariner that charge each battery individually make this even more difficult.
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, "acsarfkram" <acsarfkram@...> wrote:
>
> Hi Eric,
>
> Regarding two banks and charging/motoring are you talking about using one charger and physically moving wires to charge or use for propulsion? With two chargers and two banks you just switch the chargers on or off.
>
> For the monitoring you can setup two separate monitors or wire one monitor to be switched between the two banks. I did the latter with a PakTrakr. Initially I had current monitoring on only one of the banks, that was pretty easy to wire. I decided I wanted to monitor current on both banks - that certainly taxed my electrical ability (wiring and soldering) :-)
>
> Mark
> Santa Cruz
>
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