Charging Batteries with different chemistries

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harrison123 asked May 22, '24

Charging Batteries with different chemistries

I am designing a system for my sailboat. I will have 3 battery banks:

BANK-1 (Lithium) Main House (1,380 Ah)
BANK-2 (AGM) Winches/Thruster/Windlass Bank (400 Ah)
BANK-3 (AGM) Start Battery (100 Ah)

I have a 170 AMP alternator and will be adding about 800 Watts of solar. I was going to have a Lynx Distributor and put all charging (alternator/solar) there. That should charge the Lithium batteries. To charge the AGM batteries I was going to add two of the "Orion-XS 50A DC-DC Battery Chargers". Is this the right way to do it? I will have both lithium and AGM's to charge. Is there a better way to do this? Thanks....

battery charging AGM Battery

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nixklaus commented · May 23 at 08:20 AM

I would like to do the same configuration on my Oceanis 46.

Is it ok to connect the starter battery via Dc-DC xs to Lynx power in?

I thought the Lynx power in is only for the Lithium batterys, nothing else.

Should the Victron xs DC-DC connected to the Lynx distributor?

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pwfarnell nixklaus commented · May 23 at 01:22 PM

@nixklaus @Harrison123 The Lynx Power In can be used for any supply power, but any cables connected to the Lynx Power In need to be fused separately because they will always be powered up.when the system is on, i.e. the MPPT, Orions, etc. should have fuses on the oupruts to protect against short circuit. In this case a Lynx Distributor would save adding extra fuses.

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nixklaus pwfarnell commented · May 23 at 04:08 PM

Thank you for Your reply.

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Answer 1 · 2024-05-22T20:21:50Z

pwfarnell answered · May 22 at 08:21 PM

Using DC to DC to charge the AGM batteries is the best way to go to obtain good charging parameters on all 3 banks. The Orion XS 50 is probably more than you need for the starter battery as starting typically uses only a few Ah, consider something smaller for this duty. another solution woud be to have a battery combiner between the 2 AGM banks to combine them when charging.

You show a Balmar alternator, is this really the case, does the Balmar regulator provide adequate control for lithium battery charging or are you using another controller with better control such as a WS500 or a Zeus.

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Answer 2 · 2024-05-22T21:06:13Z

harrison123 answered · May 22 at 09:06 PM

Thanks for your reply. The Balmar alternator has a regulator with it that has charge parameters for lithium batteries. So it should be all charging to the "Lyncs Power In" and then DC/DC chargers for both AGM banks. I am not sure I can use the "Battery Combiner". Max AMPs on it is 80 and it has to power a bow thruster which draws over 150 when in operation.

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pwfarnell commented · May 22 at 09:25 PM

When the thruster operates, it may reduce the voltage on the thruster battery to say 10.5V so there is not full voltage drop available to push the full amps from the starter battery to the thruster battery, but I understand the desire to make sure it is OK in all circumstances.

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Answer 3 · 2024-05-22T21:36:39Z

kevgermany answered · May 22 at 09:36 PM

You have 2 GX devices shown. Cerbo and the Multiplus GX. You can't use both together. Either get the Non-GX multiplus or drop the Cerbo. There's a third alternative - disable the GX In the Multiplus. Expensive and needs an engineer.

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Answer 4 · 2024-05-23T15:00:56Z

harrison123 answered · May 23 at 03:00 PM

The Multiplus GX was a mistake. Is should be a Multiplus II 3000.

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