Anyone using this graph?

I have the Hook 4 and use a Duracell Ultra 12v 8Ah AGM battery that I bought from a Batteries Plus store. I've used it on trips for 6 hours without a problem. There might be better options but this one has worked for me.

The Lowrance web site says that typically uses 1.1 amps. Figure out how long you'll be on the water and buy a battery with enough amp hours to get you through.

I use a 7.5 Ah deer feeder battery. On a full charge it will last 9+ hours. I don't run it on full brightness, max 8.

I use an Elite 7. Don't know how similar those are for power usage- probably very close. the Elite would not run a full tournament day (about 9 hours) on a 15 AH deer feeder (wet cell) battery. I switched to a 20 AH Lithium Iron and now it will go at least 10 hours on full brightness. Plus it is a lot lighter in the same size case; well, almost the same size.

I'm currently in the process of testing several batteries. I'm running an Elite 4 DSI and an Elite 7TI on two separate kayaks. To answer your question a 12V 18AH has been plenty of power for the 7TI to get through two days of fishing on full brightness for me. I'll be posting a video after several trips with each battery.

I use an Elite 5 Ti and use the 7.5 AH deer feeder battery from Academy.

If in the future you think you need more you could add a second one like I have seen on some builds.

Reason I asked is a bought an 18 ah batt off Amazon and the thing is huge. Won't fit in my Trident battery bag. So looking for something smaller.

I've been thinking about something like one of these to shave a couple pounds off the load.

NOCQUA Pro Power

I use the Binford 2000 which has 1 million amp hours! Seriously there is a formula for actually finding the correct size battery you need. People will say their battery works great but their unit might only have a .25 amp draw and yours might have a 1.5 amp draw.



Look in your owners manual and it will tell you what amps the unit uses. Plug in that number with how long you want to use it.

Step 1.

If the current drawn is x amps, the time is T hours then the capacity C in amp-hours is

C = xT

For example, if your pump is drawing 120 mA and you want it to run for 24 hours

C = 0.12 Amps * 24 hours = 2.88 amp hours

Step 2. Cycle life considerations

It isn�t good to run a battery all the way down to zero during each charge cycle. For example, if you want to use a lead acid battery for many cycles you shouldn�t run it past 80% of its charge, leaving 20% left in the battery. This not only extends the number of cycles you get, but lets the battery degrade by 20% before you start getting less run time than the design calls for

C� = C/0.8

For the example above

C� = 2.88 AH / 0.8 = 3.6 AH

Step 3: Rate of discharge considerations

Some battery chemistries give much fewer amp hours if you discharge them fast. This is called the Peukart effect. This is a big effect in alkaline, carbon zinc, zinc-air and lead acid batteries. For example if you draw at 1C on a lead acid battery you will only get half of the capacity that you would have if you had drawn at 0.05C. It is a small effect in NiCad, Lithium Ion, Lithium Polymer, and NiMH batteries.

For lead acid batteries the rated capacity (i.e. the number of AH stamped on the side of the battery) is typically given for a 20 hour discharge rate. If you are discharging at a slow rate you will get the rated number of amp-hours out of them. However, at high discharge rates the capacity falls steeply. A rule of thumb is that for a 1 hour discharge rate (i.e. drawing 10 amps from a 10 amp hour battery, or 1C) you will only get half of the rated capacity (or 5 amp-hours from a 10 amp-hour battery). Charts that detail this effect for different discharge rate can be used for greater accuracy. For example the data sheets listed in /BB.htm

For example, if your portable guitar amplifier is drawing a steady 20 amps and you want it to last 1 hour you would start out with Step 1:

C=20 amps * 1 hour = 20 AH

Then proceed to Step 2

C� = 20 AH / 0.8 = 25 AH

Then take the high rate into account

C��=25 /.5 = 50 AH

Thus you would need a 50 amp hour sealed lead acid battery to run the amplifier for 1 hour at 20 amps average draw.

Step 4. What if you don�t have a constant load? The obvious thing to do is the thing to do. Figure out an average power drawn. Consider a repetitive cycle where each cycle is 1 hour. It consists of 20 amps for 1 second followed by 0.1 amps for the rest of the hour. The average current would be calculated as follows.

20*1/3600 + 0.1(3599)/3600 = 0.1044 amps average current.
(3600 is the number of seconds in an hour).
In other words, figure out how many amps is drawn on average and use steps 1 and 2. Step 3 is very difficult to predict in the case where you have small periods of high current. The news is good, a steady draw of 1C will lower the capacity much more than short 1C pulses followed by a rest period. So if the average current drawn is about a 20 hour rate, then you will get closer to the capacity predicted by a 20 hour rate, even though you are drawing it in high current pulses. Actual test data is hard to come by without doing the test yourself.

Instead of doing all that, I specifically asked what battery people are using for their hook 7.

1.1amps x 10 hours= 11 amp hours. 11 amp hours divided by .8 = 13.75 I will stop there and say 14 amp hours will be good for 10 hours.

The rest of the formula takes in account for several things I'm not with 14 ah but that should work good for a day and do it several times before you kill the battery. Get two of the 7.5 deer feeder batteries and hook together or if you want really small and light look into a lithium battery. But for the price of one of those I would finish the formula and get the correct size so it will last.

My Elite 5ti uses 0.9A @ 13V and yours pulls 1.1A @ 13V.

Unless you leave it on all the time any of the aforementioned batteries will suffice for a days fishing.

If you are running lights as well then you might need additional power to handle it.

I've seen several guys use a 2 battery set-up on theirs to make sure they have enough. Some of them also do overnight trips so they can't recharge them easily during the trip.