Tohatsu TLDI 50 battery relocation, long run of wire?

[RiverSpey]

I’ve got a TLDI 50/35 jet and I want to relocate my battery to the bow from the stern. This is going to be about 18’ of battery cable run. Presently using an Odyssey extreme series miniature battery that meets the criterion for CCA which is 950 I believe. It is a lot considering how small a motor. I’m wanting to run an electric anchor pulled up in the bow and was thinking if I can get some more weight forward it would help in a lot of ways. Is this too far to run my battery? If not, what is the most appropriate gauge of wire? I’m thinking I might step it up to a larger still battery, but what is the smallest/lightest that would be recommended for this, considering the distance?

 

[pvanv]

If it will be cold, you need a minimum 1000 CCA battery. That is to keep the voltage to the ECU up when cranking. A smaller battery will still crank, but the ECU may not initialize correctly, as the voltage to the ECU will drop during cranking..

Extending 18 feet is actually 36 feet, considering both 12v and ground, so you need some hefty wire to negate the loss due to the length. I would see what is available. 4 AWG is not out of the question. 2 AWG would be even better. That will give you 3% voltage drop at 40 feet, allowing 50 amps to get through during cranking. See http://www.marinco.com/en/resources/...t-voltage-drop