HDS7 or HDS9?

[Jxjones]

Originally Posted by TJones

How long will you be on the water? The 7" draws 1.7 amps max which is huge compared to a HDS gen 2, and .5 amps more than the HDS gen 3 carbon. .5 amps increase is pretty significant. IMO. The 9" draws minimal 2.0 amps and a max of 2.9 amps draw rate. Right now I am running a 7" live and pretty much had to upgrade my battery because a 15 amp battery was not cutting it. It would not even handle the HDS 7" carbon for a full day of fishing. I would imagine that you are willing to buy a LIPO battery correct? Unless you are gonna carry a 20 lb SLA battery? My 30 amp LIPO is coming in at under 9 lbs. The battery dimensions are reasonable also. I have it installed in a nylon bag mounted behind the center hatch. Batteries should always be secured somehow from flying around, needless to say. One other draw back with going to a 9" screen I could think of is the wind coefficient. The 9" would probably be like a sail. Being able to run a quad split screen with a 9" would be way easier on the eyes. But at what cost? If we were on a boat, I would say go for it. But take a serious thought about some of the real world drawbacks before pulling the trigger. Again, some of this might not be so significant if you are only fishing for short periods of time. But personally, I spend 8-10 hours, sometimes 12 or more hours on the water in search of that prize yellowtail. Hope this was helpful.

Thank you for the thoughtful reply. While I spend up to 12 hours on the water, power is not really a concern. I fly remote control aircraft and use the batteries between my two hobbies. Based on 2A draw @ 12vdc (24 watts) and 25.2 watt-hours worth of battery, I can run for around 10.5 hours. BTW, the pack and set up weighs in at under 4lbs. If I forget to turn down my screen brightness, I can always swap out batteries midstream. Again, thank you very much for the thoughtful insight. The debate continues...

[Jxjones]

My power set up using RC aircraft batteries.

[PapaDave]

the 7 inch is just fine, nine might be in the way.

[JohnMckroidJr]

Originally Posted by Jxjones

Thank you for the thoughtful reply. While I spend up to 12 hours on the water, power is not really a concern. I fly remote control aircraft and use the batteries between my two hobbies. Based on 2A draw @ 12vdc (24 watts) and 25.2 watt-hours worth of battery, I can run for around 10.5 hours. BTW, the pack and set up weighs in at under 4lbs. If I forget to turn down my screen brightness, I can always swap out batteries midstream. Again, thank you very much for the thoughtful insight. The debate continues...

Pretty cool to multi-purpose the high-end lithiums. Ever try any of the blue bricks off ebay? Must be using a different battery than the one in the photo or keeping the brightness super low. 10A @ 2A/hr = 5hr battery life.

[Jxjones]

Originally Posted by JohnMckroidJr

Pretty cool to multi-purpose the high-end lithiums. Ever try any of the blue bricks off ebay? Must be using a different battery than the one in the photo or keeping the brightness super low. 10A @ 2A/hr = 5hr battery life.

Haven’t tried the blue bricks, but have to look into them...thanks! The battery in the photo is a 6 cell, 10 ah battery. Each cell charges to 4.2vdc, so a total of 25.2 vdc. This gives a total of 252 watt-hours. Plan to step this down to 12 vdc. With about 96% efficiency on the voltage regulator, this will give me around 242 watt hours. At 2 amps/hour, this should give me around 10 hours (242 wh/12 vdc/2 amps/hour = 10.08 hrs). Thinking about building a 441 watt-hour battery using 33, 35a-h 18650 Li-ion cells. This should give me around 16-18 hours on the water.