Transducer placement, battery questions...

[slonezp]

15 hours ago, Deephaven said:

I think the interference concern is over blown.  Sure it will happen, but when you realize that universal sonar is included in many trolling motors it would be terrible if it always happened.  Ferrite bead/choke should also solve those concerns.  Sure it is easier and bombproof to have a separate power source, but just like in car audio tracking down your grounds and making sure they are bulletproof to prevent leakage and alternator noise is the key.

When I had my 20' Lund, I had some interference on the bow graph. A ferrite ring cleared it up some but it wasn't perfect. That graph was connected to the starting battery as was the graph at the console. The TM graph was getting interference, not from utilizing the same battery but from the transducer cable run alongside of the power cable.

 

Fast forward, that boat is gone. I have a little 14 footer now. Have a Garmin imaging unit. It came with a ferrite ring which I installed. The graph and the TM are powered from the same battery. Cables are not run parallel to each other. Lots of interference. Going to invest in a second battery just for the graph next year.

[FryDog62]

11 hours ago, Deephaven said:

I've never met a battery that was too big or an engine with too much power.  I have seen some I won't pay for though.

As for lithium or not that depends on how many charge cycles you want over how many years. 

 

For me and needing 2 batteries on a small boat - small size and light weight of the second battery just to run the depth finder is the priority for me.  This is a second boat that I will only use for a couple months and then put away and/or limited use. 

[WRB]

On 11/29/2021 at 8:28 PM, FryDog62 said:

Alternatives? 

VMax Tank 30 AH 12V deep cycle weights 8 lbs and has a case.

LFPUI-1230 LifeP04 Li-Iron is on sale $199.

Check out the specs.

TD should be mounted onto the TM using HB mounts.

Tom