Merged LiFeYPO4 1000Ah Winston prismatic cells and all electric galley...

[john61ct]

good onya for making the leap.

start a thread with your sell / hookup details, control systems, BMS etc?

[arsenelupiga]

Originally Posted by john61ct

good onya for making the leap.

start a thread with your sell / hookup details, control systems, BMS etc?

naaa, it is soo simple, it only requires couple lines.

Only use 2 x victron 75/15 with bluetooth. Finetuned parameters to match manufacturer charging curve pretty well in all conditions encountered so far.

Alternator disabled. Can be enabled if needed.

Cristec 24V charging expect 1 x per 100 days. And charging curve within manufacturer tolerance, so not to worry.

One thing that i noticed is is variable actual voltage at battery as measured by mastervolt which exactly matches voltmeter, vs voltage detected by MPPTs. This can be up to 0.3 V difference, depending on current. That is where one needs attention and finetune. 0.3 V is significant in lithium world.

that s that.

[CatNewBee]

Well done!

[CatNewBee]

Originally Posted by arsenelupiga

...
Cristec 24V charging expect 1 x per 100 days. And charging curve within manufacturer tolerance, so not to worry.
.

Why 24V? Do you still have a parallel 24V environment?

[arsenelupiga]

Originally Posted by CatNewBee

Why 24V? Do you still have a parallel 24V environment?

Oops, i meant 240 V via shore power or generator.

Exide lasted me 6 years, and still ok when removed. I felt the pain of forced to turn ON engine while sailing at 10 kn in 4 m waves because battery alarm went off. You cant even engage props. Running idle for 2 hours is not good idea either. That is why I changed batteries now.

As well, port hull, aft, has now 100KG less to carry. One hopes for that extra 0.1 kn

[CatNewBee]

For those curious, how LiFePO4 batteries work in-depth, some easy watching on a battery seminar:

https://www.youtube.com/watch?v=QlDd3jkcxoQ

[hellosailor]

Cat-
Is that just "some guy on the internet" or, did they just forget to introduce the random gaggle of people they got to watch a whiteboard talk?

Not to challenge what he's saying, just to say that there is SO much information going around with such random "authority" behind it...

[CatNewBee]

It is a technology seminar published on yt.

AFAIK, it was professor Whitacre, who held this.
He is a battery scientist, well - not so famous as the guys here in the forum, but for sure more knowledgeble.

https://www.cmu.edu/engineering/mate.../whitacre.html

I would call him an authority on batteries, but who am I?

[john61ct]

https://www.google.com/search?q=Jay+...e=lnms&tbm=vid

[rom]

HI CNB, apologies if you explained it already but what would happen if you use several 230Vac appliances simultaneously up to 5kW, roughly 400A@12V. What cables and fuses do you use from batteries to inverter. Can they handle such a load more than a few seconds or minutes ? Or are you using additional protection to prevent high loads ? thx

[CatNewBee]

Originally Posted by rom

HI CNB, apologies if you explained it already but what would happen if you use several 230Vac appliances simultaneously up to 5kW, roughly 400A@12V. What cables and fuses do you use from batteries to inverter. Can they handle such a load more than a few seconds or minutes ? Or are you using additional protection to prevent high loads ? thx

The 5kVA inverter is connected by a pair of 95mm2 positive cables, each protected by a 400A mega fuse then to the ML-RBS 500A solenoid, the mastervolt 2kVA inverter has the factory fuse 250A ANL, separate 95mm2 wires, it shares the ML-RBS with the other loads.

the negative wires are also 2 x 95mm2 for the Victron and the factory wiring for the Mastervolt. The wires between the bus bars and the Victron inverter are less then a meter in length. The bars 30mm x 5mm crossection go directly from 2 of the 3 battery poles to the fuse holders, and the wires from them to the poles of the inverter. Negative side is copper bar, 2 poles to shunt, from shunt directly to the wires of the Victron and one to the minus distribution and to the other inverter.

The shunt is a 1000A Victron shunt.

so actually, the Victron wiring is protected by 800A, besides the internal limiters, what makes sense because of its capabilities for short over-power.

The 240V transfer switches are rated 100A, in fact I could run permanently 5600W when both inverter team up, 4000 on the Victron and 1600 on the Mastervolt, what would cause 460A on the battery, distributed on 3 wires and a big copper bar. It is 0.46C load, the battery can handle the double load easily.

5600W mean 23A on 240V, I have 3 x 16A fuses for the galley, 2 phases to the induction hob and one for the oven, the remaining 240V installation is original Lagoon with 16A, the main FI switch is rated 40A if I recall corectly.

Higher continuous loads are limited by the inverters themselves.

[CatNewBee]

in post #82 are some pictures of the install board with the cell connetors top, fuses top left, right of them a small fuse box for the BMV sensor and the interface board, followed by the solenoids for Quattro, MasSine and loads, bottom left is the charge bus, then legacy charger, folowed by a fuse box for the legacy sources and a fuse for the Victron solar controller. In the center is the interface logic and right of it is the REC BMS.

Top right is the negative pole and the shunt, above are some tubes with sensor and interface signal wires inside for cell probes, temp sensors, serial interface, BMV interface etc.

[rom]

thanks, nice setup. It seems you still use the factory ON/OFF switches, can thye really handle 400+ amps ? I am interested because my main ON/OFF switch rated 600A is getting quite hot after a few minutes at 400A. Even hotter is my main ANL fuse & holder as I explained in another thread.

[missourisailor]

CatNewBee,
Please forgive me if you have already answered this. If you did I can't find it.

Are these the ML-RBS that you are using?
https://www.bluesea.com/products/cat...ttery_Switches

If so, how are you pulsing the input signal for them.

Blue Sea's tech department strongly advises against the use of a constant state signal.

[CatNewBee]

Originally Posted by missourisailor

CatNewBee,
Please forgive me if you have already answered this. If you did I can't find it.

Are these the ML-RBS that you are using?
https://www.bluesea.com/products/cat...ttery_Switches

If so, how are you pulsing the input signal for them.

Blue Sea's tech department strongly advises against the use of a constant state signal.

Hi, I have explained it somewhere in the first posts here, with a detail shot of a single channel, however - here the circuit board for all channel inclusive the opto-coupler interface protection relais and resistors to protect all BMS outputs.

Yes, this are the BlueSea ML-RBS bi-stable solenoids.

This was the original plan, finally, the 2x500A fuses I have omitted, instead i have used the fuses as described above per channel.