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Post by westboating on Sept 15, 2021 20:23:15 GMT
I'd like to hear from any NC owner on your year and battery layout from the factory.
I believe we're supposed to have 4 batteries. 1 for the thruster, 1 for cranking the port motor, and 2 for the house and starboard cranking. I only have 3 batteries, only one for the house/starboard. What do you have?
Thanks, West
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jgmallo
Full Member
Posts: 29
Jeanneau Model: Merry Fisher 895
Yacht Name: Trasno
Home Port: Portonovo
Country: Spain
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Post by jgmallo on Sept 16, 2021 1:34:58 GMT
Hello West, I have exactly the same setup on my MF895 delivered on 2020. Here you can find the exact scheme from the owners manual of how the batteries are connected from factory: Yellow: start batrery Blue: start and house battery Red: bow thurster battery Hope it helps. Regards, Jesús
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Post by Gio on Sept 19, 2021 15:12:43 GMT
The battery set-up from factory (starting + house) is really inadequate for what a modern engines needs and manufacturer recommends, actually it causes issues and overall reliability concerns.
I have upgraded the system in my 895 sport and I had to do it since the beginning because i was not able to have my engines starting after even a short usage.
First, flooded batteries are not the right batteries to start engines, don't have enough cranking power as per engine manuals. They always struggle to work even if fully charged.
Second, the wiring from factory is just wrong: the battery cables are just too long to work efficiently and there are too much power losses.
When I have some time i will publish a post on my set up.
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mf755marco
New Member
Posts: 8
Jeanneau Model: MF 755 - 2013
Country: Italy
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Post by mf755marco on Oct 22, 2021 14:14:01 GMT
Hi, I’ve a MF755, smaller than yours, but the concept is the same, batteries are used either for the services and the engine. From my point of view, services batteries must be separate from the engine batteries. Last winter I decided to separate the service battery from the engine battery and upgrade the system. For the service battery after deep investigation I selected Lithium battery, and I'm very satisfied. Of course depend the way you use the boat, in my case we often go out for the weekend and in most of the case we don’t go in the marina for the night, so service battery is stressed.
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Post by simonmf695 on Oct 23, 2021 7:17:04 GMT
Is there a VSR in the system to ensure the start battery is charged fist ?
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scopy
New Member
Posts: 4
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Post by scopy on Nov 24, 2021 11:35:29 GMT
Hello, I have ordered a Merry Fisher 895 with two engines, which will be delivered in April 2022. Is there still one battery for the house battery and the engine? I like to upgrade the system immediately upon delivery. Each engine must have its own battery, and one house battery separately. i also want to have a solar panel to maintain the batteries when i am not on the boat. How to connect everything together so that all batteries can be charged via an alternator, 220 V charger and solar panel?
Scopy
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Post by rene460 on Nov 26, 2021 9:56:26 GMT
Hi Scopy, welcome to the forum. An exciting time awaiting the arrival of the new boat. You will find lots of timeless and valuable information in the archives here to peruse in the winter nights while you wait.
It’s a good question, regarding how to connect multiple chargers to several batteries. The problem is particularly interesting when smart chargers are used which employ periodic rest and voltage measurement, and surely multiple chargers using this system poses problems.
I notice that CTek battery chargers include a system specifically to connect multiple chargers, though I know nothing about how it works. Perhaps your question will prompt some more discussion from those who know more than I do about it.
In the mean time, some research on the energy typically gathered by solar panels over a day in your area, and some estimating of your storage needs for overnight stays will help you prepare. Most forum members seem to find that the fridge is the major load to be accommodated by storage for overnight, and of course, all the energy used over 24 hours must be supplied and/or replaced each day. This will give you an idea of how many panels you will be trying to mount, and what battery capacity you will be needing to accomodate. Also, your agent may be able to provide you with electronic copies of the wiring diagrams so you can get to know what is supplied and how it is connected.
rene460
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ncPartyHat
New Member
Posts: 1
Jeanneau Model: 2020 NC 895
Yacht Name: Party Hat
Home Port: Anacortes
Country: WA
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Post by ncPartyHat on Feb 6, 2022 21:58:47 GMT
I'd like to hear from any NC owner on your year and battery layout from the factory.
I believe we're supposed to have 4 batteries. 1 for the thruster, 1 for cranking the port motor, and 2 for the house and starboard cranking. I only have 3 batteries, only one for the house/starboard. What do you have?
Thanks, West
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idefixsc
Full Member
Posts: 34
Jeanneau Model: NC 895 Sport
Yacht Name: IDEFIX
Home Port: Georgetown, SC
Country: USA
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Post by idefixsc on Feb 14, 2022 13:10:36 GMT
Hi everyone, also one experience doesn’t create a rule I had no issue with my current set up till now. The boat is almost one year old and has close to 100 hours (yes we use it a lot!).
I have two AGM 220AH 1400 in cranking power. Those are dual cycles. And one AGM 90AH for the bow thruster. Never had the smallest issue with cranking, the battery dedicated to start has plenty of power to crank those engines all day long. If I had to change something I would use a deep cycle for the house instead of dual. A deep cycle will still give you north of 900 cranking power which plenty enough to start your twin 250, but having the benefit of longer (deeper discharge) usage for the house.
Fair sail to y’all
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Post by westboating on Mar 2, 2022 0:27:22 GMT
So I was told by the service folks the 2nd house battery was an option. I wasn't aware of that when we ordered the boat. I'm getting a 2nd house battery added in the next few weeks, and we'll see how that works. I wonder if the system shouldn't have a single crank and 2 house that aren't used to start a motor. Another fun fact: I failed to realize my batteries were flooded and failed to service them, which, if not causal, certainly reduced the service life.
Anyone have recommendations on how to leave the DC system during longer periods of storage. We left her with the shore power and battery charger on.
thanks
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Post by rene460 on Mar 3, 2022 10:46:21 GMT
Hi Westboating,
Interesting questions that apply across the board, whether power or sail. There is lots of information on these topics in the archives worth browsing in quiet evenings.
On your last question, the agent advised when I bought the boat , that the three switches be turned off when leaving the boat. Our marina specifically requires that boats be not left connected when the owner is away from the boat, so switches off and power disconnected has been my procedure since new.
From the risk management point of view, this procedure minimises the probability of electrical faults causing a problem when no one is there to notice. However it also leaves two questions open.
The obvious one is maintaining the battery charge. These days, most of us have at least some solar capacity and this easily solves the battery charging. I have a 55 watt panel (size tells you something about its age) connected on the battery side of the switches with its own regulator and fuse, and this keeps the batteries about 70% to 80% charge. Quickly brought back to 100% by plugging in overnight at the marina when we arrive back at the boat. I also have a two way VSR to ensure that both the engine and house batteries remain charged. With my house battery capacity, a larger solar panel wouldn’t hurt, and definitely needed if you want to run the fridge while you are away. If I was starting the installation today, I would select at least 120 watts, and would seriously consider two x 120 watts with separate regulators.
The other question is whether the bilge pumps and some other “essential services” should be on a separate circuit which is left live while you are away, but that is a discussion for another time.
My thoughts on the required house battery size are that it requires consideration of your normal use pattern. You need a large enough battery to supply your power needs during the time your engine and/or solar panels are not generatIng. The battery then has to be supported by sufficient generating capacity, whether solar or engine run time to replace what is used each day. Your fridge will be the main component of this, particularly to run overnight, but instruments, device charging and so on will add to this. My experience is that one extra house battery will be a bit borderline, though I would do a lot better with a bigger solar panel.
The thruster battery is a separate issue. The bow thruster cycle involves relatively high current for short periods. I would expect the current draw when operating is considerably more than the current being generated at the time. My observation is that main engines are usually idling in neutral while the bowthruster is in operation, so generating minimum current. The high current draw, combined with the position in the bow of the boat, and corresponding heavy wiring to minimise voltage drop, tend to drive the decision towards a separate battery mounted close to the thruster for best performance. The separate battery also helps isolate the voltage fluctuations from operating the thruster from instruments and radios that may be more voltage sensitive.
Finally, again from the risk management point of view, I would expect that each engine should have is own dedicated start battery, but it’s a bit academic for me with a single engine craft.
Of course other solutions are possible. We all have to deal with modern production philosophy which is very focussed of meeting a cost point, and tends to result in a minimal installation. However as users, we also have different priorities. I prefer to spend a bit more to achieve higher reliability. A keen racer, even in the power boat world, might accept a little more risk and favour minimising weight. Someone who mainly uses the boat as a day boat, may not want to spend money on extra batteries required for extended cruising, and overnighting at anchor without shore power. Some forum members add huge capacities to run water makers, coffee machines, freezers etc. and other essential devices for modern life. So it is up to each of us to evaluate our needs for our type of boating, and add to the basic installation provided as required for our use.
rene460
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Post by lynnardm on Mar 4, 2022 14:32:44 GMT
So I was told by the service folks the 2nd house battery was an option. I wasn't aware of that when we ordered the boat. I'm getting a 2nd house battery added in the next few weeks, and we'll see how that works. I wonder if the system shouldn't have a single crank and 2 house that aren't used to start a motor. Another fun fact: I failed to realize my batteries were flooded and failed to service them, which, if not causal, certainly reduced the service life. Anyone have recommendations on how to leave the DC system during longer periods of storage. We left her with the shore power and battery charger on. thanks I turn off all 3 DC main switches when not on my 895. This does leave power on for a few 12v things like the wenasco heater (which I check to be off) and the fuel vapor sensor. I leave shore power on which powers the battery charger and also supplies power to the dehumidifier when plugged in. I also close the water Intake ball valve for the toilet. Capt’n Lynn
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