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AGM Batteries for Motorguide
Have just got my batteries for my 24v 80lb Motorguide, they are 2x 170ah AGM's, bought off ebay, although I suspect they are more like 100ah.
Do they need to housed in a box? or can i just strap them down to keep them secure.
Planning to locate them under the passenger side dash in my bowrider, wired through a 60amp breaker to an Anderson plug.
Be interesting to hear how other guys have done theirs.
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Re: AGM Batteries for Motorguide
If there 170amps they will weigh over 40kg each that's a lot of weight on one side when you have a passenger with you.
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Re: AGM Batteries for Motorguide
No real need to box agms apart from keeping the connections dry and preventing accidental contact. Drop something across 24 volt terminals and shit gets real in a big hurry.
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Re: AGM Batteries for Motorguide
I currently have them sitting under the dash, ill screw an eyelet into the floor either side and strap them down.
Need another pair of terminal covers.
Theres a short cable connected to a 60amp breaker bolted directly to a + terminal running to an anderson plug that will connect to the MG cable.
The batteries weigh 21kg each, they're labelled 170ah but more like 100ah is my guess.
The 80lb 60" MG weighs 16.5kg.
Looking forward to testing it out.https://uploads.tapatalk-cdn.com/202...c87403b621.jpg
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Re: AGM Batteries for Motorguide
Quote:
Originally Posted by
ben475
I currently have them sitting under the dash, ill screw an eyelet into the floor either side and strap them down.
Need another pair of terminal covers.
Theres a short cable connected to a 60amp breaker bolted directly to a + terminal running to an anderson plug that will connect to the MG cable.
The batteries weigh 21kg each, they're labelled 170ah but more like 100ah is my guess.
The 80lb 60" MG weighs 16.5kg.
Looking forward to testing it out.
https://uploads.tapatalk-cdn.com/202...c87403b621.jpg
Even 21 kgs sounds a little light for a 100amp AGM ..... they might be 75 amp.
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Re: AGM Batteries for Motorguide
Quote:
Originally Posted by
ben475
I
The batteries weigh 21kg each, they're labelled 170ah but more like 100ah is my guess.
Looking forward to testing it out.
Yeah I decided not to buy off Ebay for batteries....failing to list the battery weight in the specs was a big red flag for me...
The sticker on the side and any claims by faceless sellers are meaningless...…
It really should be cleaned up....a bricks and mortar shop couldn't get away with it..
I think Nagg is right in the ballpark with his assessment of 75 amps....
Go lithium for your next batteries....I bought my mine off a guy I could ring up and talk to...he also helped me with advice on installation and battery monitor setup as well as recommending a battery charger from a competitor.....as I had no experience I found this all very comforting......and I still got the batteries for ebay prices...very impressed by the lithiums so far...I have a total of 6 100Ah batteries onboard so the weight saving is also significant.
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Re: AGM Batteries for Motorguide
Its all good, i was expecting the AH ratings to be a bit dodgy.
I didnt want to have more weight than needed either, will see how these go.
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Re: AGM Batteries for Motorguide
Quote:
Originally Posted by
disorderly
Yeah I decided not to buy off Ebay for batteries....failing to list the battery weight in the specs was a big red flag for me...
The sticker on the side and any claims by faceless sellers are meaningless...…
It really should be cleaned up....a bricks and mortar shop couldn't get away with it..
I think Nagg is right in the ballpark with his assessment of 75 amps....
Go lithium for your next batteries....I bought my mine off a guy I could ring up and talk to...he also helped me with advice on installation and battery monitor setup as well as recommending a battery charger from a competitor.....as I had no experience I found this all very comforting......and I still got the batteries for ebay prices...very impressed by the lithiums so far...I have a total of 6 100Ah batteries onboard so the weight saving is also significant.
For intetests sake, whats a 100ah lithiun worth and how much do they weigh?
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Re: AGM Batteries for Motorguide
edit...didn't read proper..
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Re: AGM Batteries for Motorguide
Quote:
Originally Posted by
ben475
For intetests sake, whats a 100ah lithiun worth and how much do they weigh?
My fusion 100amp LiPO4's weighs 14.3kgs each - cost about $1100 each
I'm also running a 125 amp Enerdrive in my cars canopy which weigh 15kgs ….. As it whas part of the electrics package I can only tell you that they typically sell for $1500-$1700
There is massive price disparity between brands / sellers - eg 100amp - You can spend as little as $750 or as much as $1500 .
When you are going to spend so much money on a battery - IMO it's probably best to go with known brands , brands with a long history in batteries - Generally you'll pay more but you know that the R&D will be there & that the support will be there if something goes wrong . As opposed to someone filling a container of batteries out of China & selling them off the back of the truck.
Chris
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Re: AGM Batteries for Motorguide
Quote:
Originally Posted by
ben475
Its all good, i was expecting the AH ratings to be a bit dodgy.
I didnt want to have more weight than needed either, will see how these go.
No disrespect Ben - but you really should do a little research on this kind of stuff …… 170amp or 70amp ??? When it comes to electric motors - amps mean the world . 2 x 70amps ( AGMs) will be pretty bloody useless if you intend to offshore spotlock . remember that your motor will draw around 50amps on full power - you will be destroying these batteries in around 40 mins of use ( Recommended DOD -Depth of discharge is 50% for a AGM ) After 50% your reducing your life expectancy of the battery.
Now generally you'll be running at 25-50% power - so that will give you only up to about (1h 20mins - 2h 40mins) Theoretical usage .
I just came back from a trip where I spotlocked in 10-15knt winds & got about 6 hrs out of a pair of 100amp LiFePO4s before the batteries shut down ( Lithiums can be discharged down to 5-10%) So to get the same performance out of a pair of AGMs - I would have needed a pair of 175amp batteries.
This is why it 's actually important knowledge to have.
Chris
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Re: AGM Batteries for Motorguide
Quote:
Originally Posted by
NAGG
No disrespect Ben - but you really should do a little research on this kind of stuff …… 170amp or 70amp ??? When it comes to electric motors - amps mean the world . 2 x 70amps ( AGMs) will be pretty bloody useless if you intend to offshore spotlock . remember that your motor will draw around 50amps on full power - you will be destroying these batteries in around 40 mins of use ( Recommended DOD -Depth of discharge is 50% for a AGM ) After 50% your reducing your life expectancy of the battery.
Now generally you'll be running at 25-50% power - so that will give you only up to about (1h 20mins - 2h 40mins) Theoretical usage .
I just came back from a trip where I spotlocked in 10-15knt winds & got about 6 hrs out of a pair of 100amp LiFePO4s before the batteries shut down ( Lithiums can be discharged down to 5-10%) So to get the same performance out of a pair of AGMs - I would have needed a pair of 175amp batteries.
This is why it 's actually important knowledge to have.
Chris
No doubt lithium batteries will be more affordable in the future, bit much for me to justify now though.
I bought these batteries as 100ah, seller said they ran out so would send me 170ah.
I asked about weight they said about 25kg vs 22, so i suspected they're ratings are loosely based.
At the monent my main use will be casting lures in dams. So will see how these go.
I just about need a new deep cycle for my 4wd so if these dont work out they will go there.
Very mixed info regarding 12v v 24v 55lb vs 80lb thrust and battery usage, makes it hard to go by. I will just have to see how it all works out for me.
I opted for the 24v 80lb over but wasnt really sure if i needed it, bit costly to change that later.
Easier to upgrade batteries later if i find them inadequate.
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Re: AGM Batteries for Motorguide
Quote:
Originally Posted by
ben475
No doubt lithium batteries will be more affordable in the future, bit much for me to justify now though.
I bought these batteries as 100ah, seller said they ran out so would send me 170ah.
I asked about weight they said about 25kg vs 22, so i suspected they're ratings are loosely based.
At the monent my main use will be casting lures in dams. So will see how these go.
I just about need a new deep cycle for my 4wd so if these dont work out they will go there.
Very mixed info regarding 12v v 24v 55lb vs 80lb thrust and battery usage, makes it hard to go by. I will just have to see how it all works out for me.
I opted for the 24v 80lb over but wasnt really sure if i needed it, bit costly to change that later.
Easier to upgrade batteries later if i find them inadequate.
For lurecasting in dams - you'll get away with a days fishing but you'll probably need to charge at the end of the day .
It probably would hurt to carry a multimeter & check the charge through the course of a days fishing …. Then you'll get a better understanding. .
Don't get me wrong - I wasn't necessarily pushing the Lithium barrow …… It's more the amperage .
At one stage I ran a big 200amp AGM with a 55lb minn kota ….. it was a heavy thing (55kgs) but I knew that I could fish in dams , rivers , offshore & I wouldn't run out of charge in a days fishing ….. but most importantly I wasn't going to flatten it.
I'm sharing my own experience of not really understanding the relationship between the power draw of a minn kota , battery cycling etc & I prematurely killed a pair of pretty expensive AGMs in just a couple of years.
Even in hindsight - I probably should have put 150amp Lithiums in my boat as opposed to the 100s as I cant get a days fishing out of them when it's blowing over 10knts .
Anyhow - I hope it works out for you.
Chris
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Re: AGM Batteries for Motorguide
Quote:
Originally Posted by
ben475
For intetests sake, whats a 100ah lithiun worth and how much do they weigh?
Haha sorry mate I should learn to read better..
I was recommended these calb 100 batteries...they are commonly used in commercial applications apparently like electric cars, airplanes, military, household etc..
They come in individual 3.2v cells and work out to $640 each 12v and that weighs in at 13.2kgs and have 100 useable amps available...
About half the price of "reputable brands"..
https://www.evworks.com.au/calb-ca100
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Re: AGM Batteries for Motorguide
Thanks for the input guys!
Yeah i will have a multi meter onboard.
Fully expecting to recharge each day. I have a ctek 10amp and a cheaper 20amp charger so i can put them overnight as long as i have power.
More AH are better but come at the cost of weight or $$$ if lithium.
Will be inyeresting to see how i go.
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Re: AGM Batteries for Motorguide
One of the fastest changing technologies around are the Lithium Batteries, not the cells but the circuitry that monitors and controls usage and charging. Pay less, get less is pretty much the way it is. Some of the latest have inbuilt charging circuitry that allows you to use virtually any charger on them. So if buying them you really need to know what you are getting in the way of circuitry and that can be hard to identify. Go with suppliers that have been helpful to others and know their products.
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Re: AGM Batteries for Motorguide
Quote:
Originally Posted by
NAGG
Even in hindsight - I probably should have put 150amp Lithiums in my boat as opposed to the 100s as I cant get a days fishing out of them when it's blowing over 10knts .
.
Chris
Sounds like an upgrade to a 36v motor would be helpful to you, Chris..
I also have a Victron battery monitor which has an app for the phone...its shows all the details of state of charge , amps being drawn at any time and other stuff like setting high and low point and midpoints to make sure your whole bank isn't damaged because of a faulty cell......without it I would not have a clue what was going on..absolutely love it..
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Re: AGM Batteries for Motorguide
Quote:
Originally Posted by
disorderly
Sounds like an upgrade to a 36v motor would be helpful to you, Chris..
I also have a Victron battery monitor which has an app for the phone...its shows all the details of state of charge , amps being drawn at any time and other stuff like setting high and low point and midpoints to make sure your whole bank isn't damaged because of a faulty cell......without it I would not have a clue what was going on..absolutely love it..
Cheaper to go bigger batteries . I reckon I need about 30-50% more capacity to get me through a day where the wind is blowing 10knts. In better conditions I'll pretty well get through the day now.
Chris
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Re: AGM Batteries for Motorguide
One thing you may consider. I have a similar setup with the 24v motorguide and 2 x 12v AGM batteried.
I got myself a 3 pole/3way switch, which I have wired up so I can have the batteries either in series, parallel or disconnected.
I also have a relay and switch so I can link the parallel setup with the starter battery (admittedly if I link it whilst parallel only one battery is connected
to the starter battery).
What this means, is that normally, I just have the batteries in 24v connected to the electric motor, but when charging, all three batteries are in parallel
allowing me to use a normal 12 charger (20Amp in my case). Also in theory, I can charge from the alternator whilst traveling. At night (at anchor) I run the lights,
sounder etc from the 2 Aux batteries in parallel, saving the starter battery, for starting the motor and for use on the bilge pump.
It probably just complicates things a little, but I located my batteries securely in a fairly inaccessible place, so I can't just rewire them whilst charging.
I have a pair of 120Ah, and I don't seem to ever get near 50% drain. I use it offshore and in morton bay all day without much of problem. I am sure if I "anchored" for an hour or
two in a 2 knot current, I would drain them.
If you are interested in details, let me know.
Also, I have gotten a couple of lithium batteries for use in the 4wd and in the smaller tinny. A 50Ah one for the tinny and I made up a 160Ah (4 cells) for the 4wd. I can easily link
them together for a total of 210Ah. If you make your own, you need to be careful with the electronics, i.e. get a proper controller with cutouts for protection of the battery etc.
The 50Ah is a unit which has all the electronics built in. As an Auxiliary battery its fine, but a bigger one would be required as a starter. My 60hp 2stroke
sucks up 150 amps or so on start, which can trigger the automatic cutout. Also when charging from the alternator, once fully charged and the voltage creeps too high,
again the automatic cutout, which due the the voltage fluctuation, would cause my electronics to cut out. A largish capacitor might be able to sort that out, but
that exceeded what I was willing to do to make it work, especially around salt water.
regards
Duncan
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Re: AGM Batteries for Motorguide
Quote:
Originally Posted by
NAGG
Cheaper to go bigger batteries . I reckon I need about 30-50% more capacity to get me through a day where the wind is blowing 10knts. In better conditions I'll pretty well get through the day now.
Chris
Would definitely recommend these guys for initial and aftersales service...
https://www.evworks.com.au/calb-ca180
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Re: AGM Batteries for Motorguide
I was talking to a fella at work today who has the same hull as I do and does similar type of fishing, runs a 12v 55lb minn kota (no spot lock) gets all day no worries and said hes never felt the 55lb to be under powered.
Not sure how this will compare to my 24v 80lb as far as battery usage is concearned, running 12v setup would have made things a bit easier though.
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Re: AGM Batteries for Motorguide
I ran a 55lb on a 4.5 centre console for a while. Dams - awesome, bit of breeze no worries, normal tidal flows it would do reasonably easily, spotlocking offshore in current, swell and 10knots - she was working hard. I did use it to fish the run off in the river when Awoonga spilled over in 2011. It was running flat out to hold position.
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Re: AGM Batteries for Motorguide
Quote:
Originally Posted by
ben475
I was talking to a fella at work today who has the same hull as I do and does similar type of fishing, runs a 12v 55lb minn kota (no spot lock) gets all day no worries and said hes never felt the 55lb to be under powered.
Not sure how this will compare to my 24v 80lb as far as battery usage is concearned, running 12v setup would have made things a bit easier though.
All depends on what you want to use it for as already mentioned ...no wind or current and it would last for days...but if you want to use it for spotlocking in the ocean then there will always be variable conditions and currents.....
To hold us in position my 36v was running nearly flat out at 32-33 amps last weekend in washing machine like conditions...thankfully conditions improved before we or the batteries wore out...…
I think it was a good decision to go 24v for you...
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Re: AGM Batteries for Motorguide
Quote:
Originally Posted by
disorderly
All depends on what you want to use it for as already mentioned ...no wind or current and it would last for days...but if you want to use it for spotlocking in the ocean then there will always be variable conditions and currents.....
To hold us in position my 36v was running nearly flat out at 32-33 amps last weekend in washing machine like conditions...thankfully conditions improved before we or the batteries wore out...…
I think it was a good decision to go 24v for you...
Well at least i wont be under powered.
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Re: AGM Batteries for Motorguide
Hi Ben , I just posted in another board here , and yes I went lithium 2 x 135 amp batteries at $630ish a piece . . I undestand the original out lay is alot now and that is up to you . but looking at your picture , I put a bulk head in at the front of and between the two consoles to seperate the front and back and put the 2 batteries between the consoles to provide better balance , Then I have a peice of hinged carpeted ply with a couple of rails so I can make a walkable lid over the top , so I can walk through to the front of my bow rider which is a casting deck basiclly . But you want to center that weight , MO .
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Re: AGM Batteries for Motorguide
Quote:
Originally Posted by
GAD
Hi Ben , I just posted in another board here , and yes I went lithium 2 x 135 amp batteries at $630ish a piece . . I undestand the original out lay is alot now and that is up to you . but looking at your picture , I put a bulk head in at the front of and between the two consoles to seperate the front and back and put the 2 batteries between the consoles to provide better balance , Then I have a peice of hinged carpeted ply with a couple of rails so I can make a walkable lid over the top , so I can walk through to the front of my bow rider which is a casting deck basiclly . But you want to center that weight , MO .
Can you post a pic of your setup?
How much do your lithiums weigh?