Marine Electronics Forum - stereo/amp/speaker battery advice needed

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03-26-2012, 09:40 PM
On my 2005 26 reg twin 200 hpdis and 3 batteries :
Looking to upgrade my stereo. I have a poly planer mrd 80 head unit and am junking the speakers. Want to install amp and 4 new speakers. Will my battery set up be enough and not drain it? Was thinking modereate amp 500 watts. I have no idea on what I should do and again, will my batteries handle it. Any info or advice on what to do/purchase, speaker placement, and wiring information would be greatly appreciated. I do not need a super system just some clean sounds.

03-27-2012, 03:32 AM
The best thing to do is add up your current draw on all electronics and then add in the additional load from the upgraded stereo/amp. Compare that to what your batteries can supply and go from there.

Lots of good choices out there for marine audio, clarion, polk, etc.

Easiest would be to replace your existing speakers with a higher quality. You may or may not need an amp depending on the head unit and speaker layout you go with for the replacements.

I did this last year, went from cheap-o 6.5's to 6 X 9's and the difference was much better in terms of sound quality.

03-27-2012, 05:37 PM
thanks beachtyme

03-29-2012, 10:24 AM
furuno 48mi radar nav net1/2, simrad auto pilot, mrd 80 radio, xm radio, garmin 4210, icom vhf, and 2 1500 rules. Any help appreciated.

03-29-2012, 10:32 AM
if you have room to add another battery i would do that. run your house off of one motor and 2 batteries and then your stereo off your one engine and other two batteries. i have a similar setup but and running 5 batteries. 3 for the stereo off of one motor and 2 for my house load. My electronics load is right at 50 amps max draw 2 5212s, 604 radar, gsd26, 2 vhf 200s. stereo is 120 max. autopilot 40 amps. pumps are 15 x 7 so 105 amps. plus lights etc. it all adds up quicker than you think.

03-29-2012, 12:14 PM
Thank you bradv> Im clueless to battery set ups. I have little room where the other batteries are mounted so I'll have to do something in the step down where the head is. This is my issue, I know nothing about batteries and don't want to risk it. Maybe I should install the amp and new speakers and have my local marine elec. shop come out and do the batteries.

03-30-2012, 03:55 AM
its not the end of the world. you just need to know your batteries abilities vs your system requirements. if you never sit there with your motors off then you dont need the requirements. if you do a lot of drift fishing or slow troling and run radar, screens, stereo etc at a decent clip then you need a little more reserve. any clue what size batteries you have.

think about it like this a 27xhd interstate which is what i run has 180 reserve minutes. which means after 3 hours of 25 amp draw the battery is dead as a doornail. most batteries you dont want to drop more than 50% so just assume then that after 1.5 hours at 25 amps is all you would want to run that battery.

my jl amps at wot burn up 60 amps each. average listening level on the water about 25 amps a piece. heres where it gets a little different. certain batteries are better or worse with higher amp draws on the system. so at 25 amps i have 180 minutes of capacity. but at 50 amps doesnt mean that you have 90 minutes you have less probably around 75 or so. theres an equation that you can use to figure it out exactly and certain battery manufacturers rate their batteries with that formula. so anyways i have 270 reserve minutes assuming 50% discharge with 3 batteries grouped together. so at normal listening level i have about 5 hours worth of battery. So sandbar days i know im ok.

As far as the other side of the bank with just 2 batteries. i have over 200 possible amps between radar, sounder, screens, vhf, autopilot, pumps, etc. however with this side most of the stuff isnt being used when not running like the radar, sounder, screens, autopilot. so the long term requirements arent as much. even if drift fishing we dont sit for too long and usually would just have the screens and vhf on. which together they can pull up to 35 amps but more realistically just sitting there less than 10 all together. bait pumps are 15 a piece which i usually just have 1 or none on depending on the type of fishing.

so anyways the real questions are if you have the space and if you know how you are planning on using the boat. its not that hard and the information is out there. if you are worried and unsure then i definately suggest you hire a professional. you may be able to find a guy who will work with you and teach and show you some stuff.

03-30-2012, 03:59 AM
Have one or more spare ways to start the boat / charge the batteries if the stereo flattens the battery. On mine, the 2,500W stereo is on the three group 31 bank, there is another two group 31 bank and the gen / 50A charger is on its own group 31 bank so plenty of backup.

03-30-2012, 02:22 PM
I'll post the exact set up in a bit. Pretty sure its going to be a jl 5 channel amp, jl sub, and 4 speakers (2 under gunnel and 2 forward). I'm not sure what to do battery-wise. The amp i think is a jl 600? I know its a 5 channel. This battery issue is the key. What batteries to I run this system off of? If I add another just for the system, how do I set it up with the others? Do I need to replace the 3 bank charger w a four bank? Can I get another charger for this one battery? I obviously have no idea what I am doing with the battery set up. I can do it but need to be told how.
thanks again

03-30-2012, 04:18 PM
I'd add another battery so u have 2 2 battery banks. One bank will have just the stereo and amp and the other side will have everything else. Just have all 4 batteries the same

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