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Posts: 1460
Location: Kronenwetter, WI | Any way to wire up a third battery to extend running time on a 24v system? |
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Posts: 1184
Location: Iowa Great Lakes | Not 100% sure but I think you would have to run 4 to keep and even draw. I have never ran the batteries down in a days time in either of our boats, 1 has a PD 74 the other a POS Maxxum 80. Run the largest group you can fit in the box will improve run time better than adding batteries. we run series 29 or 31 Interstates. |
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Posts: 4080
Location: Elko - Lake Vermilion | I don't think so.............Don't 3 batterys = 36volts?
I could be wrong, as the cocktails have been kicking in for the last 2 Hrs.
Jerome |
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Posts: 280
| You would need to use 4 batteries. 2 sets of 2 in series (jumper between + and -) to get 24V out of each set and then connect the two sets in parrallel (+ to + and - to -) to get double the capacity. |
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Posts: 433
Location: Cedarburg, Wisconsin | Not really. You can run 2 in parallel with one in series for 24V, but other than getting a little more power when you first start out, you would be disappointed with the results I'm afraid. You need 24V to get max speed out of your motor and as the single battery wears out so does your 24V even though the other two in parallel would have gobs of reserve. You would be able to run longer in theory, but you would probably only get slow speeds as the max voltage you had available diminished.
So would it be worth the effort and expense to rig a system this way? For the little gain you'd get, I doubt it.
There is another way to do it, by creating a voltage doubler circuit on one battery to put in parallel with the other two in series, but by the time you got done constructing the circuit you'd be better off just getting a 36V motor. The more complicated you make things, the more likely they are to break and be unrepairable while on a trip.
If you really need the extended run time on a 24V system you need 4 batteries. |
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Posts: 1460
Location: Kronenwetter, WI | Not really an issue during most outings, but on my annual trip...I think I'll have my partner bring two of his batteries along and keep them charged, them swap out at the dock for the second half of the day while the first two are getting recharged. |
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| I have gotton great run time when the batteryu has been left on the trickle charger for a couple days before the trip. Strange but it doesnt seem like 5 or 6 amps for 12 hours seems to give it as complete a charge as a long slow one. |
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Posts: 2754
Location: Mauston, Wisconsin | Almost-B-Good - Nailed it for you. Don't even waste your time trying 3 batteries.
If you do go for four(4) - hook them in parallel - and run them that way- you will get a lot more running time.
Re. charging for 12hrs @ 5-6A. You need to think about the battery as a fuel tank. If you average 4hrs of use over a 12 hr fishing day and your trolling motor was drawing 25A - you have removed 100 ampere hours (4hr x 25A = 100AH).
Now you have to refuel it/recharge the battery. If you have 5A charger it will take 20-24 hrs to get the bulk charge back into the battery, because there are also charging losses/heat in the battery while recharging it. If you have a 10A charger its going to take ~10-12 hrs to deliver the bulk charge (~95%). A 15A charger will get you there in ~7-8hrs. It actually takes much longer to get to 100%. If you're fishing back to back days- You should consider a 15A charger.
Have fun!
Al |
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Posts: 1536
Location: God's Country......USA..... Western Wisconsin | If you want to stick with your 24 volt trolling motor next time when you buy batteries get 3 Trojan 8 volt batteries. Hook up in series for 24 volts will last all weekend. 4, 6 volt batteries will be even better and less weight than 4 12 volt. |
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Posts: 1460
Location: Kronenwetter, WI | Actually, I think this might be my answer:
http://www.minnkotamotors.com/products/battery_chargers/dc_alternat...
Thanks to the guy who showed me it. |
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Posts: 829
Location: Maple Grove, MN | I would just look at getting much larger capacity batteries. There are some with a lot of capacity if you don't mind spending the money. Here are some that go to 205 minutes capacity. That is a lot for one battery:
http://www.cabelas.com/cabelas/en/templates/product/standard-item.j... |
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3-battery 24v system?