36v Bow Mount Trolling motors

[Lovey80]

Hi All,

I am wondering if there are any out there with these in action? Specifically looking at 36v trolling motors and what sort of average power burn they are seeing? Obviously most of the specs say 50amp max draw @ 36v. But I'd like to get some real world figures on the average draw. If you could also mention the size/type/weight of your boat that would be helpful.

I notice Nagg with his 24v system was finding 100ah x 2 to be insufficient and went to 125ah x2 and found that to be a more suitable amount of battery storage. My 12v system is hard to compare because it's not used offshore. Using Nagg's numbers, if they were to correlate similarly to a 36v system and a heavier boat. I think I need to be in the 375ah (3x125ah - 12v) range at a very minimum to get a full day bottom bashing on spot lock. Even then I'd imagine as soon as the wind got to around 12knots, that level of storage would be under-gunned.

I am assuming that batteries are full when I get offshore and not taking into account anything going back in moving spots or minimal from solar on the roof.

Love to hear your thoughts and especially real world experience.

P.S. Talking Lithium Iron Phosphate chemistries only.

[baitable]

Hi All,

I am wondering if there are any out there with these in action? Specifically looking at 36v trolling motors and what sort of average power burn they are seeing? Obviously most of the specs say 50amp max draw @ 36v. But I'd like to get some real world figures on the average draw. If you could also mention the size/type/weight of your boat that would be helpful.

I notice Nagg with his 24v system was finding 100ah x 2 to be insufficient and went to 125ah x2 and found that to be a more suitable amount of battery storage. My 12v system is hard to compare because it's not used offshore. Using Nagg's numbers, if they were to correlate similarly to a 36v system and a heavier boat. I think I need to be in the 375ah (3x125ah - 12v) range at a very minimum to get a full day bottom bashing on spot lock. Even then I'd imagine as soon as the wind got to around 12knots, that level of storage would be under-gunned.

I am assuming that batteries are full when I get offshore and not taking into account anything going back in moving spots or minimal from solar on the roof.

Love to hear your thoughts and especially real world experience.

P.S. Talking Lithium Iron Phosphate chemistries only.

21ft cat- 36v 112lb with 87 inch shaft. Held the boat in bloody good 25knts squall for 10mins easy- decided to turn it off not to burn the motor out. Wouldn’t go less than 87 inch for the cat. Have enerdrive lithium 36v battery works well. Can easily a see a full days fishing out of spot lock with up to 15knts. No need to charge on the water.

[NAGG]

Hi All,

I am wondering if there are any out there with these in action? Specifically looking at 36v trolling motors and what sort of average power burn they are seeing? Obviously most of the specs say 50amp max draw @ 36v. But I'd like to get some real world figures on the average draw. If you could also mention the size/type/weight of your boat that would be helpful.

I notice Nagg with his 24v system was finding 100ah x 2 to be insufficient and went to 125ah x2 and found that to be a more suitable amount of battery storage. My 12v system is hard to compare because it's not used offshore. Using Nagg's numbers, if they were to correlate similarly to a 36v system and a heavier boat. I think I need to be in the 375ah (3x125ah - 12v) range at a very minimum to get a full day bottom bashing on spot lock. Even then I'd imagine as soon as the wind got to around 12knots, that level of storage would be under-gunned.

I am assuming that batteries are full when I get offshore and not taking into account anything going back in moving spots or minimal from solar on the roof.

Love to hear your thoughts and especially real world experience.

P.S. Talking Lithium Iron Phosphate chemistries only.

Hey Lovey

A 36volt set up will pull about 38amps / hr running flat out .......

then there are the variables ( a long list)

If your boat needs a 36 volt system its because it is bigger / heavier or bulkier .......... A bass boat with 36 volt in 20knt will be a lot lower than a 670 HT Barcrusher .... even less than a 6m Cat .

so while 36 volt will draw less than a 24 or 12 volt on the same hull ....... that wont be the case on bigger , heavier or more bulky hulls.

My take is that you still need big batteries if you want a full days spot locking ........ I would shit a day in on 200amp 12 volt - but struggle on 100amp 24 volt (same boat) .

If you are spot locking on 36 volt ....... go 3 x 125 amp (12 volt) or as big as is available in 36 volt.

Chris

[Dignity]

Lovely, I have an Allision Vision 195 and loaded up with all the gear for an overnighter on the trailer it comes in a little over 2T, take trailer off and no idea what it weighs. I realised that I take around 60- 80kg of ice, add some lead especially deep dropping where each lead is 4kg it all adds up.
I have a Motorguide Xi5, 105lbs 72inch shaft linked to a 120ah 36V Green Energy LiFePo4 battery.
My last trip was in reasonably good conditions as my brother is a bit of a wuss and according to the BMS I used around 11% of the battery for 5 hours of use. It was being used in 65m of depth, a lot of spot locking as most times I sounded using the depth sounder, setting a WP and main the Main motor to get within 20m or so before letting the leccy move to the WP and spot lock.
If used carefully utilising both motors you will get quite a lot out of your battery.

A couple of pro mackerel fisherman up here get 3 days use easily although granted they only are out generally half a day.
I need to get out more and work out how much I can get out of the unit but the last 10 weeks has seen me sidelined. Tried posting a pic of the app from last trip but getting an error, this site is really causing havoc lately with posting stuff.

[Lovey80]

21ft cat- 36v 112lb with 87 inch shaft. Held the boat in bloody good 25knts squall for 10mins easy- decided to turn it off not to burn the motor out. Wouldn’t go less than 87 inch for the cat. Have enerdrive lithium 36v battery works well. Can easily a see a full days fishing out of spot lock with up to 15knts. No need to charge on the water.

thanks mate that gives a good idea. How many Ah is your 36v battery?

[Lovey80]

Lovely, I have an Allision Vision 195 and loaded up with all the gear for an overnighter on the trailer it comes in a little over 2T, take trailer off and no idea what it weighs. I realised that I take around 60- 80kg of ice, add some lead especially deep dropping where each lead is 4kg it all adds up.
I have a Motorguide Xi5, 105lbs 72inch shaft linked to a 120ah 36V Green Energy LiFePo4 battery.
My last trip was in reasonably good conditions as my brother is a bit of a wuss and according to the BMS I used around 11% of the battery for 5 hours of use. It was being used in 65m of depth, a lot of spot locking as most times I sounded using the depth sounder, setting a WP and main the Main motor to get within 20m or so before letting the leccy move to the WP and spot lock.
If used carefully utilising both motors you will get quite a lot out of your battery.

A couple of pro mackerel fisherman up here get 3 days use easily although granted they only are out generally half a day.
I need to get out more and work out how much I can get out of the unit but the last 10 weeks has seen me sidelined. Tried posting a pic of the app from last trip but getting an error, this site is really causing havoc lately with posting stuff.

thanks dig. Are you using the BMS to monitor your usage or do you have a separate smart shunt? Have you cross checked your BMS used statistics against what you put back in with the charger when you get home?

[Lovey80]

Thanks for the replies. That gives me a good idea. I’m probably going to go down a slightly different path in using a very big 12 battery and the 12-36v converter. So if 125amp @36v us a minimum I’m going to need at least 375ah @ 12v. With some converter losses I’m looking at least 400ah @ 12v.

[Dignity]

thanks dig. Are you using the BMS to monitor your usage or do you have a separate smart shunt? Have you cross checked your BMS used statistics against what you put back in with the charger when you get home?

The bluetooth BMS monitor is built in, unlike others it sits there passively and you can only read it once a load has been put on it. Apparently the supplier found less failures in the monitor this way. The first few times I did use a monitor to check how much I was charging and found it to be reliably close.

Edit: I found the newer motor (motorguide) with a 3 blade prop albeit smaller than the 2 blade to be far more efficient than my 2013model 12V MK in the Passage.

[chris69]

Thanks for the replies. That gives me a good idea. I’m probably going to go down a slightly different path in using a very big 12 battery and the 12-36v converter. So if 125amp @36v us a minimum I’m going to need at least 375ah @ 12v. With some converter losses I’m looking at least 400ah @ 12v.

You might be able to make a 36v l 206 amp lithium for around the same price as a 36v 120 amp going by the prices ive seen or 412 amp lithuim at 12v for way less.

[Lovey80]

You might be able to make a 36v l 206 amp lithium for around the same price as a 36v 120 amp going by the prices ive seen or 412 amp lithuim at 12v for way less.

I’m still in the design stages of the boat at this stage. The battery compartments etc will be custom made. so just looking at space and sizing for what I’ll need. I may just do 2x 300 amp 12v systems one for house and one for the TM and then if I ever need the extra from the house I can just parallel them if 300Ah won’t be enough for the day. If I see the TM battery get to 20% and the house is at 80% I can just flick the switch and balance them out to get me through the last part of the day.

[baitable]

bit of weight to carry around... that and reliability of a battery not exploding on the water was a big issue in my decision to pony up and just get a 36v battery from enerdrive... it works and suits my spot lock needs for a big day on the water for a cat which is essentially a brick in the wind...

[baitable]

just 105aH - with minn kota 36v 112lb...

[NAGG]

I still prefer the idea of building 36 volt by having 3 x 12 volt

If you have an issue with a 36 volt - you replace a very expensive battery - much better to replace 1 x 12 volt if there is an issue . Additionally you can easily get 125 amp vs just 100amp .

Chris

[baitable]

I still prefer the idea of building 36 volt by having 3 x 12 volt

If you have an issue with a 36 volt - you replace a very expensive battery - much better to replace 1 x 12 volt if there is an issue . Additionally you can easily get 125 amp vs just 100amp .

Chris

voltage is deemed too high with 3 qty lithiums linked up according to some users with end voltage in excess of 36v... at the end of the day everyone has an opinion and a budget and i guess you can listen to whomever you want... theory vs practise.

[chris69]

voltage is deemed too high with 3 qty lithiums linked up according to some users with end voltage in excess of 36v... at the end of the day everyone has an opinion and a budget and i guess you can listen to whomever you want... theory vs practise.

Yer never thought about the 36v side of things 3 x 12 v lithiums would be 38.4 volts.