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  1. J

    Wiring to use only one leg of Victron Multiplus II output

    Thanks BentleyJ, and for the tip on where to also look for this kind of info (scoured the manual but didn't go back to datasheet). Jeff
  2. J

    Wiring to use only one leg of Victron Multiplus II output

    In a 50 amp split phase Victron Multiplus II setup, I would like to use only one leg of the AC out 2. On the Multiplus AC Out 2 connection point, I will only connect wiring to L1 and Neutral and earth, and will not connect wire to L2. Sorry for what is probably silly question - is this the...
  3. J

    Victron Multiplus II 2x120 - Too Loud?

    Thanks for feedback - when it was noisy during float charging, was that due to the fan noise? Any ambient 'hum' sound during normal operations - e.g., including when not charging or inverting? I'm guessing that I will just have to install the thing, use it under load and charge with it, to get...
  4. J

    Victron Multiplus II 2x120 - Too Loud?

    I'm considering a Victron Multiplus II 2x120 for a 45 foot boat environment, but wondering if the fan / other noises from the unit would be too much for the small space? I've seen some reports of relatively high noise from this unit, and wondering if anyone has some real-world experiences...
  5. J

    Battery Isolator / Alternator question

    Thank you Mike! I appreciate your (and everyone's) explanations. Just to make sure I understand, here is what I'm now planning: - moved Orion DCDC charger to be connected to starter battery - NOT to the Cristec isolator output - Orion DCDC charger would be enabled only with ignition ON, to...
  6. J

    DC - DC Charger Placement in Sailboat LFP setup

    RE the Amp-L-Start, I missed this from the web page: A new Ignition-Controlled Relay Kit is now available for use with all AMP-L-START™ revisions. It automatically inhibits operation of the AMP-L-START™ whenever your motorhome engine is running - Perfect for applications where a DC-DC power...
  7. J

    Battery Isolator / Alternator question

    Hi Mike, I have a 150a one input/three output Cristec isolator: https://www.cristec.fr/english/our-products/battery-related-products/rce-electronic-battery-isolators/ My current house AGM bank is connected to the third isolator output. When I replace with Lithiums, was hoping to just connect...
  8. J

    DC - DC Charger Placement in Sailboat LFP setup

    Amp-L-Start looks neat - sort of a DCDC charger, but not charging/just passing current from one battery bank to another and acting as an isolator between them (a 'dumb' DCDC charger)? @Horsefly my setup is very similar to your brother-in-law's, although I have a 'dumb' alternator and am using...
  9. J

    DC - DC Charger Placement in Sailboat LFP setup

    Wow - talk about nice bluewater boats! I've only seen them in pictures and read on internet, but beautiful! I love the Beneteau and seems like I have been in electrical upgrade 'planning' mode for quite awhile. I'm wiring for the max loads, but in reality would not expect to get near full...
  10. J

    Battery Isolator / Alternator question

    Thanks Mike, Understand - I should not connect the output from the DCDC charger, directly to the same 'input' on the battery isolator (together with the alternator). Jeff
  11. J

    Battery Isolator / Alternator question

    Thank you - Is it correct that if the AGMs are not being charged (resting voltage ~12.8), and the LIFEPO4 batteries are being charged from separate source at ~14.4v (e.g., from solar or shore power), then I could set the the DC - DC to start charging the AGMs by sensing the LIFEPO4 source...
  12. J

    Battery Isolator / Alternator question

    Thanks FilterGuy! Yes, Victron TR Smart (just added this to original post). Separate but related question and to help me understand how these things should work (note this would not work with my first question - otherwise I would have a 'loop' of charging. This is just separate hypothetical)...
  13. J

    Battery Isolator / Alternator question

    Hi everyone, I've got a 150amp battery isolator with one input, and three outputs. A 125a alternator (w/ standard/non-upgraded regulator) is connected to the isolator input. The first output goes to an AGM battery bank, the second output goes to a separate AGM battery bank, and the third...
  14. J

    DC - DC Charger Placement in Sailboat LFP setup

    Thanks for all the help everyone - It's not how I would set it up from scratch, but here's what I've decided in order to keep changes to existing system/wiring to a minimum: - using existing isolator (which currently splits alternator 3-ways to: house bank, starter, and bow thruster (all AGM...
  15. J

    DC-DC Charger and an Isolator

    Joe, did you implement this setup as you describe? I'm adding lithium house bank and would make life much simpler if I just add a dc-dc charger off one of the outputs on my isolator, to get the benefit of alternator charging to my lithium bank.
  16. J

    DC - DC Charger Placement in Sailboat LFP setup

    It's a Beneteau Oceanis 46.1. Another thought leading me in the opposite direction and would be interested in any thougts - this setup only let's me charge my house bank by solar or shore power - not from the engine. If out on extended cruise without good sun (and no shore power), I haven't...
  17. J

    DC - DC Charger Placement in Sailboat LFP setup

    Makes sense - I may implement without a DC-DC charger and do some close monitoring to see if I need to add one. If I added the DC-DC charger in this way, I would also need to add something to split the charge between starter and bow thruster battery (an isolator?) - any easy ways to split...
  18. J

    DC - DC Charger Placement in Sailboat LFP setup

    Thanks Shinebox - makes sense, and you are right about short use of thrusters and only when engine is running. I think I'm chasing a non-issue with this, worried about the possibility that those batteries don't get fully topped up from engine use (or drain after sitting for period of time...
  19. J

    DC - DC Charger Placement in Sailboat LFP setup

    Here's the charging setup: The LFP batteries get charged from: - solar (100a MPPT charger from 1155 watts of solar) - Two 40a chargers powered by Shore Power The starter and bow thruster batteries get charged from: - 125a alternator I could either add a DC-DC charger from the LFP batteries...
  20. J

    DC - DC Charger Placement in Sailboat LFP setup

    Each charging source (MPPT and the two 40ah chargers) use specific LIFEPO4 charging configuration
  21. J

    DC - DC Charger Placement in Sailboat LFP setup

    Thanks Shinebox - sounds like you have a nice setup. I'm still struggling over how to set this up some. Part of my plan was to keep my 'dumb' alternator charging the start/bow thruster batteries. My question then is how do I 'supplement' charge to the start/bow thruster batteries above what...
  22. J

    Sailboat LIFEPO4 parallel wiring for 6 batteries

    Thank you wholybee! I've revised the schematic and pasted below with your third option, which makes sense to me. Regarding fuses and wire sizing - Each 100ah battery allows for 30 seconds of 200ah surge, and 1/2 second of surges above 200ah. My estimated 'maximum' load on this entire bank at...
  23. J

    Sailboat LIFEPO4 parallel wiring for 6 batteries

    Thanks Time2Roll - appreciate all the input from you and everyone! Here is a diagram of how I would implement what you describe on my setup, I think:
  24. J

    Sailboat LIFEPO4 parallel wiring for 6 batteries

    Thanks again - I spent some time at the boat today measuring and examining, and then spent some more time cursing at how little space I have to do all the modifications and updates I plan! Here's my latest iteration - I'll have to figure out the cost-benefit of making the wires on the 2-pack...
  25. J

    Sailboat LIFEPO4 parallel wiring for 6 batteries

    Thanks Rocketman! With the separate fuses on each battery, would I avoid the need for a 'main' battery fuse for the combined load on the battery side, or would you recommend an additional main fuse for the combined battery load (I'm thinking probably need that too, but not sure). For...
  26. J

    Sailboat LIFEPO4 parallel wiring for 6 batteries

    Thank you both!
  27. J

    Sailboat LIFEPO4 parallel wiring for 6 batteries

    After studying lots of info on parallel wiring and best balancing, my main takeaways are: - use large gauge wire - try to keep battery connection cabling to similar lengths to support best balancing - Exact lengths not super critical With this in mind, I've come up with the following wiring...
  28. J

    DC - DC Charger Placement in Sailboat LFP setup

    Sorry now realized I should have possibly placed this in Marine, but was also thinking it was a pretty general question. I can't find the ability to move the thread from the edit feature.
  29. J

    DC - DC Charger Placement in Sailboat LFP setup

    I've spent many hours learning and scouring this great forum and the web, but still puzzling over best setup for my sailboat solar/LFP upgrade i'm planning early spring: Here's is a list of my planned equipment - all 12v: - Single diesel engine, 125A 'dumb' alternator - 1 110A AGM starter...
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