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Lithium replacement.
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Mike2145 View Drop Down
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Points: 278 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike2145 Quote  Post ReplyReply Direct Link To This Post Posted: 23 September 2023 at 14:53
Did a bit of digging. Looks like the bow thruster factory DC-DC is making a small draw with the engine off, about 150mA. Not really a problem. However, with the engine on the Victron DC to DC lithium chargers are supplying a significant current to the bow thruster battery reducing the charge available to the lithium’s. 1-10A. Obvious really! 
I think I’ll add the ACR back in and pop the bow thruster DC to DC charger onto the starter battery bus via the ACR as it was from the original factory setup. . Not a big job but finding the cables in the loom could be! I suspect a bit of boat yoga is on the cards. 


Originally posted by Ian Coverdale Ian Coverdale wrote:

Neat.

Assume you've not installed a master isolator switch on LFP +VE as you're using remote on/off switch function of BMS?

Do you have an original thruster battery DC-DC converter and is it working okay with slightly higher input voltage? We had Sterling DC-DC thruster battery charger which thought engine was running all time due to slightly higher input voltage as so was a constant drain on LFP battery.

Be interested in any niggles once you start using the system.

Thanks for sharing :-)
Cant take a joke, don't buy a boat.
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Ian Coverdale View Drop Down
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Points: 311 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ian Coverdale Quote  Post ReplyReply Direct Link To This Post Posted: 24 September 2023 at 02:43
The problem we had was not the thruster DC-DC charger standby current but the thruster chargers (we have two, bow & stern) periodically switching to boost/absorption mode that depleted the LFP. With higher LFP battery voltage, chargers thought engine was running all the time with power available for charging. Chargers were using up to 30A (x2) in boost mode!

We added Victron BP100 on charger inputs controlled by relay in existing BMV712 which monitored engine battery voltage as second input. When engine battery was above 13.5V, BP100 closed energising chargers. I put a ON-OFF-ON rocker switch across the relay contact so chargers can be forced on when shore power connected or forced off when running engine and LFP needed more of a charge. 

Misbehaving thruster DC-DC chargers was not a problem we anticipated when upgrading to LFP.



Edited by Ian Coverdale - 24 September 2023 at 06:13
Ian & Andrea
SV Gabrielle (H445)
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SimonGH View Drop Down
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Points: 124 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SimonGH Quote  Post ReplyReply Direct Link To This Post Posted: 24 September 2023 at 04:10
This is incredibly helpful.  I'll see if it can be updated.  Thanks!!
I also have a DC-DC charger for my bow thruster.  It's a Victron 12-24v.  I believe the best route would be to connect it to the starter battery side and have both fed by the 2nd charger feed...?
Simon
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Mike2145 View Drop Down
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Points: 278 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike2145 Quote  Post ReplyReply Direct Link To This Post Posted: 30 September 2023 at 10:13
If the DC-DC charger has an engine on detection then this, I think, would be fine. The Victron Orion 12-24 has this feature.  If not then you may need an ACR in line.   

Originally posted by SimonGH SimonGH wrote:

This is incredibly helpful.  I'll see if it can be updated.  Thanks!!
I also have a DC-DC charger for my bow thruster.  It's a Victron 12-24v.  I believe the best route would be to connect it to the starter battery side and have both fed by the 2nd charger feed...?
Simon
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Arcadia View Drop Down
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Points: 1112 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Arcadia Quote  Post ReplyReply Direct Link To This Post Posted: 30 September 2023 at 20:50
I don’t think the Victron DC to DC 12-24 has voltage detection for engine on. 
Leon / ARCADIA
2018 Hanse 588
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Mike2145 View Drop Down
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Points: 278 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike2145 Quote  Post ReplyReply Direct Link To This Post Posted: 01 October 2023 at 09:13
The Victron Orion DC-DC charger range does, it’s the one I use, but I’m not certain about the other variants. 

Originally posted by Arcadia Arcadia wrote:

I don’t think the Victron DC to DC 12-24 has voltage detection for engine on. 
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Arcadia View Drop Down
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Points: 1112 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Arcadia Quote  Post ReplyReply Direct Link To This Post Posted: 01 October 2023 at 10:25
My mistake. The unit installed on my 2018 is a Mastervolt 12-24 which does not have that feature. 
Leon / ARCADIA
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SimonGH View Drop Down
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Points: 124 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SimonGH Quote  Post ReplyReply Direct Link To This Post Posted: 02 October 2023 at 19:08
Update - I got the Mk3-USB cable, but unfortunately my MultiPlus Compact is an earlier model with the older processor, so I can't update the firmware.
So I'm going a similar route to the OP, however I'm adding a charging & inverter contactor so I can connect the Charger/Inverter to the "feed" side of the DC-DC chargers when in charger mode, and then switch over to the LiFePo4 "battery side" with larger conductors when in "inverter" mode.  That way the new DC-DC chargers can handle the LiFePo4 charging profiles, but when I need the high current draw for the inverter, things are connected directly through to the battery...
I'll post a wiring schematic for comments.  Would love people to poke holes
thanks
Simon
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SimonGH View Drop Down
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Edited by SimonGH - 02 October 2023 at 19:20
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Arcadia View Drop Down
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Points: 1112 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Arcadia Quote  Post ReplyReply Direct Link To This Post Posted: 02 October 2023 at 21:33
Just curious. Why the ground relay on the inverter ?
Leon / ARCADIA
2018 Hanse 588
Sag Harbor, NY
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