garyt
Junior Member
Posts: 24
Jeanneau Model: J54
Home Port: NEW YORK HARBOR
Country: USA
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Post by garyt on Aug 11, 2020 20:06:10 GMT
Has anyone used the Super B brand that Jeanneau is installing on there boats as an option?
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Post by vasko on Aug 12, 2020 15:07:11 GMT
Vasko - I have a question: the house batteries you have recommended from aliexpress have in some cases incorporated the BMS. Do you connect them directly to the source/use of energy, i.e. to the alternator or the lithium battery inverter/charger or you put something else in-between? Other brands (e.g. Mastervolt) require a mandatory safety relay (Blue Sea Systems' ML RBS Remote Battery Switch) and fuse in the positive pole. I am redoing the wring in my motorboat and I definitely learn a lot from sailing boat systems, much more complex and efficient - if you have a wiring schematics with the components to show would be very helpful thanks I’ve asked the seller to upgrade the BMS to 150a for each battery and Yes I put then as a drop-in replacement of my previous wet batteries The important questions are: How smart is your charger ? As if very smart your LiFePo4 batteries will never been charged in full (13.6-8 float is standard but LiFePo4 will be charged in full with 14.4-14.8) How smart is you alternator ? ( as some alternator do require a resistance or else (when the LiFePo4 are fully charged and the BMS cut them off completely will put the voltage to 16+for couple of seconds and your electronics will not be happy) How smart is you solar controller ? How smart is your windgen ? Basically less smart is better for LiFePo4 ..
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Post by Gio on Aug 12, 2020 17:05:15 GMT
I’ve asked the seller to upgrade the BMS to 150a for each battery and Yes I put then as a drop-in replacement of my previous wet batteries The important questions are: How smart is your charger ? As if very smart your LiFePo4 batteries will never been charged in full (13.6-8 float is standard but LiFePo4 will be charged in full with 14.4-14.8) How smart is you alternator ? ( as some alternator do require a resistance or else (when the LiFePo4 are fully charged and the BMS cut them off completely will put the voltage to 16+for couple of seconds and your electronics will not be happy) How smart is you solar controller ? How smart is your windgen ? Basically less smart is better for LiFePo4 .. Thanks, The inverter/charger is a Mastervolt latest model, and it has a specific setting for lithium batteries Alternators are brand new model, mercury outboards and already tested to recharge lithium batteries, the alternator will be connected first to the starting battery (conventional) and then the positive pole will go to the house battery using a diode isolator no windgen no solar
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Post by vasko on Aug 12, 2020 17:18:34 GMT
I’ve asked the seller to upgrade the BMS to 150a for each battery and Yes I put then as a drop-in replacement of my previous wet batteries The important questions are: How smart is your charger ? As if very smart your LiFePo4 batteries will never been charged in full (13.6-8 float is standard but LiFePo4 will be charged in full with 14.4-14.8) How smart is you alternator ? ( as some alternator do require a resistance or else (when the LiFePo4 are fully charged and the BMS cut them off completely will put the voltage to 16+for couple of seconds and your electronics will not be happy) How smart is you solar controller ? How smart is your windgen ? Basically less smart is better for LiFePo4 .. Thanks, The inverter/charger is a Mastervolt latest model, and it has a specific setting for lithium batteries Alternators are brand new model, mercury outboards and already tested to recharge lithium batteries, the alternator will be connected first to the starting battery (conventional) and then the positive pole will go to the house battery using a diode isolator no windgen no solar Then all should be OK - you only need to calculated the maximum needed power e.g anchor windlass and make sure that the total BMS amps are enough - my windlass for example is about 90 amps (measured) and 1000watt according to spec invertor power draw also need to be accounted... When you get the batteries test them on a car start the car 10 times with each and if some show defect you need to open the battery and check the spot welding ...
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Post by sailbleu on Aug 15, 2020 6:20:27 GMT
If I go down that road , my option would be busbars . Impossible to repair a bad spotweld on anchorage . Wat I also find is that in these plug and play batteries , like the suitcase model I have , the leads are on the thin side . Ok it’s silicone insulated wires , no immediate danger for fire , but the collective copper section is in my view not adequate to withstand 100 amps . In other words , the ready to go Chinese Lipo’s don’t give that warm reassuring feeling .
Thus my mind is set , 4 separate cells to get to 12 volt , busbars , overrated BMS and corresponding leads . What would be the catch if I want to connect two groups of 4 cells each in parallel Vasco ? 2 modules of 200 Ah individual in other words . I take it I need 2 BMS prints . Will have to measure if this combination fits in where my 240Ah AGM is located now .
Refards
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Post by offpist on Aug 15, 2020 6:58:04 GMT
We have been using these 1000AH Winston cells since 2015 and they have been great. Still at 105% rated capasicty after 5 years!. REC BMS. We have been living onboard for 2 years, and have 800W solar and 2 X 200A Alternators.
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Post by vasko on Aug 17, 2020 5:45:18 GMT
We have been using these 1000AH Winston cells since 2015 and they have been great. Still at 105% rated capasicty after 5 years!. REC BMS. We have been living onboard for 2 years, and have 800W solar and 2 X 200A Alternators. Best option is go for 400ah cells one BMS and the hi-power draw like anchor windlass etc - separate connection parallel to BMS In my case I decided to connect two packs in parallel with two 150a bms so far all good ( I actually have 3 in parallel 2x120ah and one 40ah)
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Post by NZL50505 on Aug 19, 2020 2:34:17 GMT
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garyt
Junior Member
Posts: 24
Jeanneau Model: J54
Home Port: NEW YORK HARBOR
Country: USA
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Post by garyt on Aug 19, 2020 20:54:05 GMT
Have one question for anyone with lithium batteries
Because I like a cold beer when I get to the boat, I leave the refrigerator and and freezer on constantly. And since we're at the dock with shore power, I leave the battery charger on as well. Is it bad for the batteries to be constantly charging?
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Post by NZL50505 on Aug 20, 2020 1:00:13 GMT
Have one question for anyone with lithium batteries Because I like a cold beer when I get to the boat, I leave the refrigerator and and freezer on constantly. And since we're at the dock with shore power, I leave the battery charger on as well. Is it bad for the batteries to be constantly charging? That’s the best question so far with the most relevant real-world application! 😊
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Post by vasko on Aug 20, 2020 5:46:20 GMT
Have one question for anyone with lithium batteries Because I like a cold beer when I get to the boat, I leave the refrigerator and and freezer on constantly. And since we're at the dock with shore power, I leave the battery charger on as well. Is it bad for the batteries to be constantly charging? If your charger has a Li profile then Yes Else It all depends on you view - if you want to get 5000 cycles from you Li batts then No , but if you are OK with 2000 then it is generally OK If it is a smart charger - if not get a trickle charger for camper and you can leave it ON or just keep in parallel one old wet battery
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Post by johannes on Aug 20, 2020 7:51:20 GMT
Have one question for anyone with lithium batteries Because I like a cold beer when I get to the boat, I leave the refrigerator and and freezer on constantly. And since we're at the dock with shore power, I leave the battery charger on as well. Is it bad for the batteries to be constantly charging? LiFePO4 like other Li-battery chemistries suffer when stored fully charged over long time. So you will see more degradation if they are fully charged all the time, in contrast to if they are kept below 85% for example. The best strategy would be to have a battery management system where you can set the maximum state of charge, like the ones in electrical cars. Keep the state of charge at 80% when you don't need the full capacity, and then charge to 100% when you really need it.
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