What Is the Best Setup for Charging Multiple Battery Banks From an Alternator?
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- Опубликовано: 17 окт 2024
- "Hi Jeff," writes Matt. "I have three battery banks:
(1) lead-acid starter
(1) lead-acid thruster and an
(1) AGM house (but would like to upgrade to lithium)
I am looking at buying a Balmar 60 100A with MC-614. What would be my best setup for charging from the alternator? Happy to install an additional kit. I also have solar installed. I have an AC charger that will also be upgraded in the future to an inverter/charger."
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Upgrading to a High Output Alternator?", www.pysystems....
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Interesting topic as usual.
BTW, thanks Jeff for improving the sound quality of your video, this is much more pleasant to watch!
So glad! Thank you for the feedback.
Instead of having your alternator charge the lithium bank and potentially frying your alternator when the BMS shuts off the connection, you should connect the alternator to the start battery and thruster battery (assuming you keep the same chemistry for both) and then connect 1 or 2 dc to dc converters from those to your lithium bank. Victron makes a 30 amp dc to dc converter and you can run more than one. It isn’t the cheapest solution and it won’t charge your lithiums the fastest but it’s the best solution I’ve found so you don’t end up frying your alternator and you can still mix battery chemistries. I also installed a Sterling Power 12V Alternator Protection Device just in case. This will absorb a return spike voltage and save your alternator.
This depends if you have an internal or external bms. With an external bms wired to an alternator regulator, it will shut off the alt before damage happens. Then you can charge direct to the house bank which is the best way for maximum charging. With an internal bms, charging the start first then a dc to dc to the house is the safest, but then you are limited to the max current of the dc to dc. (1 or maybe a few together).
I would also look at the whole picture. if you have an inverter charger charging the house from shore / gen. the dc to dc from house to start will charge the start batt from shore too. If your alt is to the start, and your dc to dc goes from start to house; When you plug in, your inverter / charger now only charges the house and not the start. so you need a 2nd ac charger on the start.
Great points. I wasn’t aware of the external BMS situation. My lithiums are Battleborns with an internal BMS so I never researched that. Thanks for the info!
@@PacificYachtSystems Just hoping to follow up on this thread in the comments. You mention if the BMS is external, that you could wire it to the alternator regulator… what would you recommend if the BMS is internal?
I’m curious because I just bought Renogy 12v 200amp deep cycle batteries for my house and am going through the process of building a similar circuit. Thanks in advance!
I will be installing a DC-DC from start to house to utilize the alternator for charging my Victron AGM house bank. When I plug in, my Victron Inverter/Charger primarily charges the house bank, but also has a small 5amp trickle charger that keeps the starter battery topped up.
Great video! The lithium house to DC/DC charger to a thruster bank is exactly what I am working on right now and just the video I wanted to watch. I have not only the 3 separate banks I also have different voltages 24 volt and 12 volt.
A question I have though is id be curious to see an in-depth technical video on how multiple charging systems work together, ie 2 x alternator, solar, wind, etc. when all connected to one battery bank
Thanks for the suggestion
Hi Jeff, this was an exciting episode with many good tips that I found helpful. Also, the recording sound was excellent :-). Cheers.
Awesome, thank you!
I have a similar setup but configured it differently and it seems to work well so far. I have a single alternator with an internal regulator connected to a 1X3 Victron Isolator. One output directly to the lead acid start battery , another to the lead acid thruster battery, and finally the last output goes to a dc-dc charger then to the LFP battery bank. If the BMS shuts down, I still have the start and thruster batteries online. The dc-dc charger provides a LFP charging profile for the house bank. Is this a reasonable approach or will I have issues by placing the dc-dc charger downstream of the isolator?
Hi Jeff,
Can i use a battery isolator (Victron) with a old (1989) Johnson 175?
I have a, add a battery kit, with a house and starter battery. I want to add 2 trolling batteries for a 24v trolling. What’s the best way to connect the 2 trolling batteries to my current setup to have the alternator charge them as well?
I have a CC with a single 150hp Yamaha. Currently has two dual purpose batteries and I am wanting to switch to start and house banks. I would like to know if the alternator would be able to keep up with a single start battery and two house batteries in parallel? Will an ACR work properly with the house bank consisting of two batteries? Also for an onboard charger while the boat is at home, would I need a 3 bank with a disconnect between the house batteries or will a 2 bank charger work?
The boat is used mostly for hanging out at sand bars. There are two amplifiers and a decent amount of speakers, thus the desire for two house batteries.
Hi Jeff, why not use a sterling alternator protection device? I think the alternator is then protected if your BMS disconnects from your lithium.
I am installing a victron lithium setup with the lynx BMS and Wakespeed WS500 alternator regulator for my Balmar XT170. I am hoping the regulator via the Lynx BMS will save the alternator if the batteries get disconnected. Or else it could be costly:)
You need to connect the lynx ATC wire to the WS500 feature wire to have it shut down. They have a diagram for the lynx on their site. note the "cross over cable" they mention is not actually a standardized ethernet cross over cable, but a custom cable with only 2 of the 8 pins used. you Also need the wakespeed terminator, the victron ones use different pins and can not be used on both ends.
wakespeed.com/CU/Victron%20SmartLithium%20Lynx.pdf
@@PacificYachtSystems Thank you. I am working to this, www.victronenergy.com/upload/documents/MultiPlus-3KW-230VAC-12VDC-600Ah-Li-Lynx-Smart-BMS-&-distributors-Cerbo-GX-touch-generator-MPPT-Extra-Alternator-&-WS500.pdf
Albeit without the generator and using 3 200a victron smart lithiums. I have the ATC connected and also the correct crossover and terminator from wakespeed. Hopefully be ready to run in a few more days.
Hey Jeff. I have a similar setup in that I have a single alt….3 lead acid for starting and 2 lithium for house….1x3 isolator. What role does the BSM in the Lithium play. I thought the BSM was supposed to manage charge rate, temp and discharge. Is this wrong. Battlrborn lithium are pricy and I don’t want to screw them up. Thank you
The internal BMS is just a safety switch that will open in the event of a battery malfunction or voltage levels that are too high or too low to protect the battery. It will not control anything.
the Alternator itself needs to control the charging voltage. You need to control how much power you take out of them before the BMS cuts off the output from low voltage