Boat rookie

[Lannabulls]

Hi, I finally get a boat, Kimple trout 370 with a Yamaha 30 hp.
Cause it is my first boat ever I have to learn everything about maintenance, etc. A simple question, I build myself a lithium battery, 4 cells 12 v, bms, etc. From battery can I run a set of 4 cables, "2 +", "2 -", one set for my electric motor, Minn Kota edge 45 lb, another set for a couple of plugs? I mean is it safe to run more than 2 cables from a single battery?
Thanks

[MN Fisher]

It's safe - the only question is - what's the capacity of that battery (AH rating)?

Did you also get a charger rated for Lithium?

[Lannabulls]

Thanks, the battery is iron lithium, lifepo4, 4 cells, 3.6 v each, 14.4 v, 100 amps, more than enough to run my electric motor Minn Kota Edge 45 lb, that runs at 42 amps.

I built a small "control panel" with a small display that shows me battery status: voltage, temp, etc, an Anderson socket, 50 amps, to connect the Kota Edge and a 12 v car cigarette lighter and USB sockets. All it's protected by 100 amps breaker and proper rated fuses for sockets. 

I got a dedicated charger for lithium too.

Thanks 🙏 so much for your help 

[MN Fisher]

Okay - so 100ah rating....means at speed 5 on the Edge, the battery will last a little more than 2hr20min (I have the same Edge 45) - but at speed 1 it'll last 20 hours

 

Couple things -

1: I'd trade out that 100amp breaker for a 50.

2: If you got a sonar, I'd get a small 35ah battery to run that and connect it also to the lighter socket and USB ports - let the 100ah be solely for the TM

 

[padlin]

It’s safe with properly sized cables and breakers/fuses. Both should be chosen to handle the load and length of each run.

[WRB]

Electric start 35 hp OB?

Tom

[Lannabulls]

Thanks so much!

My breaker is 50 amps, not 100.

I don't have any sonar, fish finder, etc.

From battery to sockets the 2 main wires length is 1.5 mt.

 

Breaker can be used instead of fuse or better to use both?

 

One consideration and thanks again for your will to help, really appreciated!

For my Kota edge I went with a lithium battery cause I based my judgment in all the YouTube videos that I watched, it looks as the best option at list since I got my Kota edge and I read user manual. it suggests lead acid battery as best option, it says that lithium battery, cause it maintains higher  voltages rates for prolonged period of time than acid lead battery, motor should not run more than 85% of its speed. By the way, I use the kota edge only while fishing, indeed I always set my motor speed 2 or 3, 4 and 5 is to fast.

What do you think about base on your experience with Kota edge?

Thanks 🙏

[padlin]

You use the sum of both the + and the -, so 3 mt total, chart says for 50 amp use 6 gauge cable. Yes, you can use either a fuses or a breakers. If you have 2 separate circuits I’d fuse each dependent on it’s load and cable.

 

ie: the 45 lb trolling motor at 1.5 mt would be a 50 amp breaker on 6 g, say a 2nd circuit is a 5 amp load 3 mt. distant, you’d could use a 10 or 5 amp breaker on 10 g wire.

 

This page has the chart I used. Blue Sea

 

disclaimer, I’m not an electrician so do your own due diligence.

[DaubsNU1]

Head over to Tiny Boat Nation...they have lots of suggestions on boat builds. They were great when I was designing and building my old 1960 Rich Line. 

 

[MN Fisher]

5 minutes ago, DaubsNU1 said:

Head over to Tiny Boat Nation

tinboats.net is also a good resource - helped me when I was building Bass Trek.

[Lannabulls]

On 2/9/2024 at 7:26 PM, WRB said:

Electric start 35 hp OB?

Tom

Hi Tom I am not an English tangue, Italian living in northern Thailand, what do you mean? Don't get it.

Thanks for your help and quick answers, learning a lot thanks to your kindness.

You provide a chart about wires, thanks.

From my battery I got 2 set of wires, one set is 6 square mm,

the other 3 square mm,

here in Thailand we use metric, not awg, gauge as over there in USA, I suppose.

I choose 6 square mm cause the Kota edge comes with that wire size, the other set, 3 mm, connect a car cigarettes socket, it is for a 60 w spot light.

 

6 square mm wire  for Kota Edge

3 square mm wire for car cigarette socket

[WRB]

The? was do you use a battery to start the 25hp outboard engine?

Tom

[Lannabulls]

No, the lithium battery is only for my electric motor Kota edge, for my outboard motor, Yamaha 30 HP, I got a dedicated 100 amps lead acid battery.