I Have a 48V Electric Propulsion Battery Bank on My Boat, What Should I Use for My House Bank?
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- Опубліковано 4 бер 2023
- Carol has a very common question about electric propulsion on boats, "I am redesigning my boat and have a question. My boat will have 48 V propulsion, what to do with the battery bank(s)?
- Make it all 48 V and have to convert for all 12 V devices
- Have a 48 V propulsion and 12 V house bank
- Or, all 12 V and convert to 48 V for propulsion. A conversion that will be less frequent than 48 V to 12 V. Could have a 48 V windlass, AC, watermaker, etc.
What do you recommend?"
Read our Tech Talk Article from Pacific Yachting Magazine, "Eco Boating with Electric Propulsion"
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I have a Beneteau Oceanis 381 running on an Electric Yacht QT20 with 4 Volthium Lithium 200Ah battery in series for the 48v propulsion bank.
I have two solar panels in series, about 600W going to a MPPT charger on the 48V bank. The inverter charger is on the 48V bank also.
I added a DCDC 48V to 12V feeding 12/12 Battery charger for the 12V bank (400Ah lithium).
Both banks have a Cerbo GX, on the 12V bank it is communicating with the BMS.
So far, I'm managing the breakers to charge 12V from 48v.
Wind turbine will be reinstalled on 12V next summer, 12/12 charger will be managed using the remote input connected to the Cerbo GX while getting data from the other Cerbo GX on 48V. Finally, adding BMS communication on the 48V bank, should be fun.
Thanks for answering my question. So far I have 12 100ah 12v carbon lead batteries in series parallel, it will be mainly for manoeuvring and so will be leaving 8 batteries @ 48v for motoring, with the Solar. then have the remaining 4 12v in series, giving 400ah for a house bank. It’s for. 30ft ketch rig, so should be able to be able to have a decent amount of time away for shore power.
Thanks Jeff, I don't know if it was my question but it sure was a question I have.
I have the 48v engine battery bank and that feeds the 12v house bank. The 48v bank is charged by 3 x 24v panels in series on the aft bimini. But after watching this I might charge the 12volt bank also from the hard dodger panels. As you say it hard to gauge what is going to be needed the most. Cheers
I wish there were 48V fridges and 48V washing machines and 48V airconditioning for blue water boats. Eliminates conversion losses.
As 48V motors exist it should be possible to build native 48V devices.
Agree, redundancy is key, especially with modern BMS controlled batteries. Multiple batteries in each bank also helps.
If I was designing from scratch I'd put as many loads as I could directly on the 48v bank. Inverter (more efficient 48->120), water maker, 48v windlass, refrigeration and other large motors. 48->12 DC2DC to charge & power a 12v system which would include 100A LFP mounted well above the water line for electronics/navigation/lighting/etc. Solar/Wind charging controllers would probably be split to try and match the load/use of each bank & use 48v alternators. We're seeing more and more support for marine 48v products and Tesla is moving to 48v for their low voltage side so hopefully 48v devices will become the norm, easy to source.
This is exactly the puzzle I am facing. I am restoring an older 30' wooden sailboat and am doing a complete repower to electric with a 48V motor. My use case (for the first 2-3 years anyway)is day sailing with occasional weekend overnights, maybe some longer trips, but not cruising per se. I see using the motor to get in/out of the slip (I will be on a slip the first few years - then a mooring) and to get back if the wind dies, or bad weather is predicted and I need to get back quick(er).
My plan A is to have 2 x 96Ah 48V lifepo4 batteries in parallel and use a DC-DC converter to power the house loads @12V. I was thinking that by carefully monitoring battery usage I would be able to have sufficient capacity to make it back to harbor and power the critical navigation instruments. I would likely have a small portable generator for worse case backup although I would prefer to go with an Epoy methanol fuel cell but they are kind of $pendy.
Not a hard decision. For dependability and the ability to isolate faults. Multiple banks are the answer. I have 4 different banks. 24v inverter lithium bank, 12v Lithium House Bank, 12v Lithium “Working Bank” for large loads like the deck winch and bow Thruster, and finally a 12 v Lead Acid starting bank.
Currently i have 6 AGM batteries, 48V for propulsion and 2x12V for fridge and devices. Buz once the 48V lead batteries die i convert to 48V LiFePo4 with a 360W DC-DC step down converter to 12V. 300kg / 600lbs batteries are to much. Heading for 100kg / 200lbs lithium.
If your electric propulsion system had two motors, with independent 48V batteries and controllers, would that be sufficient redundancy, or would you still want a separate 12V house bank?
Thanks for doing these! We’ll have to get a consult with you for our houseboat build at some point. We are looking at a 48v bank and Victron inverter for AC loads but are wondering if it’s worth a 12v bank for the normal DC loads, or DC to DC converters for the 12v loads.
Absolutely! Feel free to contact us at solutions@pysystems.ca
What about putting the inverter and propulsion on 48v, then having a 24 ro 12v house bank? Our inverter is our biggest DC draw and they are easy to get at different voltages. The rest of the house (starters, winches, windlass) not so easy to get at 48v. At least this minimizes the current required between the banks.
The relevant question is, why do you want to use electric propulsion ? The answer(s), once stripped of emotion, ignorance, irrationality, denial, reality, wishful thinking and false virtue signalling, is Don’t, assuming you go further than a couple miles from the dock.
Is the propulsion you are referring to for a trolling motor or a docking pod? Or is this some kind of Greenie electric boat
Usually, we are referring to sailboat auxiliary and power boats in any size primary. Fuel free dinghies as well.
Oh! It's a blow boat. They do not cross my mind when I think of boats. Oops. I have severe sailboat ism. I will work on it