Am I over thinking this?

[TNriverRAT]

I have a 1552 aluminum boat that's somewhat tight on storage space. Run a group 24, 12V 56Ah cranking battery and blue top optima (blue 34 DC that is 10 years old and probably in need of replacing, can tell it loses juice quickly as by 5 hour of fishing the TM is struggling) for minn kota maxxum 55# thrust. Recently purchased garmin ultra2 126sv, livescope bundle, and uhd2 93sv w/ gt56 transducer. Plan is to have both mounted at the console running with gt56 (93sv as the host). The 126 will be used back and forth to the bow for ffs on a separate cradle and power cord. Looked into getting a ionic lithium dual purpose for cranking and the electronics but my motor being a 2012 40hp evinrude etec has me second guessing. My boat mechanic says the older etecs charging system weren't made for lithium BMS and there is a possibility of it frying the outboards emm.. charging system? So my plan of action is keep the group 24 for cranking and the 93sv w/ transducer. Have a positive and negative terminal blade fuse block with 12 gauge wire ran to the 9" mfd (about 8' run from battery to where graphs will be mounted). Is it ok for this fuse block to sit on top of outboard power supply on the battery terminals? (amazon link to terminal mount https://a.co/d/h5pheif)

LiTime battery is having a "spring black friday sale" and I'm looking at the group 24 12V 100Ah battery. One for the TM and another for the 126sv and livescope GLS 10. Battery will also have the aforementioned dual terminal fuse block. Wires off it (12 gage) for cradle and power cord at console for 126, and another run (10 gage) to the bow of boat for GLS 10 and cradle w/ power cord for same 12" graph when its brought to the front. I will put a cut off switch or quick connect at GLS10 so it doesn't draw power when not in use. Per garmin the 126 needs about 30Ah for 12 hour trip and approx. 21Ah for same duration of time on GLS 10. Realistically I only need 60Ah battery but figure why not get more capacity as the prices are similar. This also gives room for expansion down the road if I added another graph. Or if I upgraded the trolling motor to a 24V, as I'd like a TM with spot lock at some point. The two 12V would then be wired in series for TM and I'd add a 60Ah or mini 100Ah at that time for graphs. 

My at home AC charger is an EverStart Maxx 40 Amp Battery Charger and Maintainer (BC40BE). it has a button to change from Lithium to Lead Acid, but when searching online I don't see anything in the description that mentions it can be used on LiFePO4 batteries. So would you also get the LiTime 3 bank 12V 10A battery charger?

Does this seem legit? Any suggestions of change or tips on best way to wire this if mine thoughts on the project aren't sufficient?

TIA

[casts_by_fly]

In your situation, I would get a pair of LiTime 100 ah. One for the trolling motor, one for all of the electronics. Leave the cranker for the motor, bilge, lights, etc. All of your electronics are drawing about 6 amps. That will give you 12-15 hours of run time. It also keeps you in an all 12v charger situation.

 

i did similar on my boat setup that’s in progress. I went 24v battery to save space, but it limits charger options. And you don’t need a 24v system now, so stick to 12.  Get a 3 bank noco now and if you go 24 later, just keep it for the three lithium’s and add a single noco for the lead acid later as a trickle charger. You won’t really need it though really since you won’t be running electronics and the big motor has an alternator. 

[TNriverRAT]

I appreciate your response Casts! I read that people really stress "clean power" to the livescope system, which was my thought process on having the 9" and gt56 running off the cranking battery. I guess when using the bow graph and lvs34 the gt56 ducer can be turned off? Hopefully this will eliminate interference from the stern transducer.. if there is any at all. At some point I'd like to share the ffs to the 9" at console for the wife or fishing partner in back of boat. With addition to installing NMEA2k, as I think its cool to monitor the evinrude stats from a graph.

[casts_by_fly]

14 hours ago, TNriverRAT said:

I appreciate your response Casts! I read that people really stress "clean power" to the livescope system, which was my thought process on having the 9" and gt56 running off the cranking battery. I guess when using the bow graph and lvs34 the gt56 ducer can be turned off? Hopefully this will eliminate interference from the stern transducer.. if there is any at all. At some point I'd like to share the ffs to the 9" at console for the wife or fishing partner in back of boat. With addition to installing NMEA2k, as I think its cool to monitor the evinrude stats from a graph.

clean power means no motor interference and good consistent voltage. 
 

if you want to network in the future id just go straight there now. You’re most of the way there already. I’m not sure if you need a network expander/hub or not but you have everything else. 

[TNriverRAT]

Touché, might as well knock out the addition of NMEA2k and garmin network cable while installing the rest!