Would a lawnmower battery be sufficient to run a HB 798 only? Just curious. I know they want you to run a direct line to the battery.
Bassky
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Would a lawnmower battery be sufficient to run a HB 798 only? Just curious. I know they want you to run a direct line to the battery.
Bassky
Bassky, this is what I use on my jon boat. Very light and they are deep cycle..
Cabela's: Cabela's Rechargeable 12-Volt Battery
You can use any 12 volt battery source. Just note the amp hours and the power draw on the unit, the more amps the battery has the longer you will be able to run the unit before needing to recharge it, if the unit is only item running off the battery. The 798 draws @ 615 mA/ hr
I picked-up 2- Hummingbird 7AH AGM batteries (with chargers) last year for around $50 on Amazon, but I see they've went-up in price (with everything else). I use one for my FF and another for my Reel-Lite.
If you can, get the AGMs (as opposed to lead acid), they can mount in any position, and don't out-gas when charging. I have over 1000AH of AGMs for the PV Solar Bank in my Bus.
You can get these AGM rechargeable 12v batteries online for super cheap. They are used for alarm systems, rc car starters, ups, etc. Look here (no affiliation but have done lots of business with these guys, highly recommended!) Sealed Lead Acid Batteries. As others have said, find the current draw of the unit in amp-hours, then match it to the battery that provides the capacity you need. I.e. if your unit draws 0.5 ah, an 8 amp battery would provide 16 hours of use. I recommend adding 20% to your required capacity to account for the variances in batteries. So, if you want to use a 0.5 ah unit for 8 hours without recharge, you would need a 16 ah battery + 20% (16 x 1.2) = 19.2 ah.
There is the option to use your trolling motor battery as well, but you need to use an inline noise suppressor. You can find these for pretty cheap online, at Best Buy, etc. They are typically sold as car stereo amplifier noise filters and they simply go inline with the positive lead.
-Bill
I use AGM electric wheel chair or scooter batteries. I get 35-40 AMP/HR for around $55-60. Fantastic shelf life, and they last forever while in use. I use one to run a 50 lb thrust motorguide trolling motor, and it never let me down - lasts all day.
Pretty cheap for an AGM battery. Most I seen were over 100 bucks in that ah range. I got a powersonic 35 sla for 50 bucks.Quote:
Originally Posted by Sam
Keep in mind you can't use 100% of the battery. A 50% or less discharge will prolong battery life. Deep repeated discharges will kill a battery as quick as anything, there are so many cycles (discharge/recharge) in them.
Sam,
Where do you buy these at?
Bassky
HBDeborah,
That is what I plan. So how many amp battery would be sufficient for say 8 hrs usage per trip? Not too knowledgeable about batteries. I was thinking of using an AGM type or Sealed lead acid type.
Thanks
Bassky
You're taking the right steps by calculating the power requirements before buying anything. I used a single 7.5 Ah SLA battery for my previous finder (HB575) and expected to continue this setup after upgrading to a HB1197. Running the 575, my battery lasted all day, but the 1197 (much larger screen, color, SI, GPS) ate 4 of this size battery in a single day, so I had to hook up to the starter battery.
Using .615 Ah as the current draw for a HB798 (you should confirm that this is the maximum draw under all operating conditions), I'd say you need battery capacity of at least 10 Ah. Here's the math:
.615 Ah draw X 8 hr. trip = 4.92 Ah
Following NeonMoon's advice, you should avoid drawing a battery down more than 50%, so that means you'd need twice the 4.92 Ah. Result: 4.92 X 2 = 9.84 Ah.
Two of the 7.5 SLA batteries would be a good choice. The extra capacity would allow for those days when the bite gets going 8 hrs. into the trip & you keep fishing until it's too dark to see! The extra capacity would also prevent drawdowns of > 50% and would keep you going for many months (years) after the SLA start showing signs of old age.
For about the same cost of two 7.5 Ah batteries, this 12 Ah SLA (with charger) would be a good option.
Corker,
Can you charge these with a battery charger like for regular 12v charger for cars or marine batteries? or do you need to buy the small charger like on the website for $20?
Bassky
Corker,
This is what I bought, 12Ah SLA, thanks for the info.
Bassky
Corker,
This is what I bought, 12Ah SLA, thanks for the info.
Bassky