Ok so let’s say I got an ionic125… how long should it last if I have it designated strictly for my electronics without being hooked to motor for charging through the day? I run a lowrance hds pro 10 and front with active target 2 and a hummingbird at console

125 ionic runs these

2 solix 15 gn 3
1 solix 12
360
mega live
2 network boxes
after 10 hours of fishing i will still be at 57 percent

Awesome. Thanks much

Also, I do some winter fishing and jw if it would be better to go with the one with the built in heater or not? 🤔

Same challenge I put forth on BBC.

For all you high volt believers, start up your OB before you turn on your electronics. Probably 13 - 14 volts. Turn them on. Let them power up fully. Turn them off. Shut off the OB. Now power up your electronics. Any difference?

Reverse the procedure. Start your electronics before you start the OB. Let them boot completely. Start the OB. Any difference?

Try in in the late afternoon after you've been fishing several hours.

I've tried this multiple times. Never a change. Helix 10, Helix 12, M360, ML, TL Ethernet. 125 AH Ionic Lithium. Dedicated 8 ga pair to a Blue Seas fuse box. Short runs to the units.

HB and Garmin both say higher voltage means nothing as long as in the specified range since voltage is controlled in the unit.

Hds 10 pro = 2.9 amp/hr
Helix 12 = 3.2 amp /hr
AT2 = 1.5 amp/hr
AT2 module =1.5 amp /hr
Total amperage draw is about 9.1 amps per hour.
In theory a 125 ah lithium could support this draw for 13.7 hours

Are you sure calculate the AT2 transducer and the AT2 module (3.0Ah)? I've not installed a Lowrance, but that doesn't feel right.

On their site, the AT2 Transducer + Module current draw spec is 1.5a @ 13.8v (20.7W). Convert that figure over to a 12.8v nominal battery and that turns into 1.6a @ 12.8v. Also each component separately is showing the same, I can only assume the pair of components is that current draw, I doubt the module sitting there without a transducer pulls much of anything alone.

My calculator is estimating around 18hr of run time for that setup.

Went ahead and got me an ionic 12v 125ah. Preciate all the help everyone

If all you are doing is running electronics without using it for the starting motor, just about any lithium battery with sufficient amp hours would do.
You don't need a battery with a big BMS rated for the cranking and charging amps that a starting battery would use.

You’re gonna like it.