Charging a LiFePO4 via an Inverter

[Sundancer2727]

Good day.
First post and I did a little searching first.......
I am looking to charge a 100AHr LiFePO4 via an Inverter and Battery Charger combo. I already have both.
My thinking is that the Inverter will isolate and handle the power for the Charger..
I know that this is kind of a 'Rube Goldberg' setup, but, as I said, I already have most of it and need to protect the Suzuki's Charging while charging the LiFePO4.. What am I missing?
Thanks for your thoughts.

 

[alldodge]

Welcome
Lets see if @tpenfield or @bruceb58 can advise

 

[boscoe99]

Should be no problem whatsoever.

What will be powering the inverter?

Not understanding protection of the Suzuki charging system being needed. Why?

 

[bruceb58]

As long as the inverter output is high enough for the max charge of the charger.

I would only use an inverter that was a pure sine wave inverter.

Do you have the specs for both the inverter and the charger?

Overloading your alternator would be the biggest concern.

Personally, A WAY better option is to use a DC to DC converter like the Victron 50A XS Orion

Victron ORI121217050 Orion XS 12/12-50 non-isolated DC-DC charger with EMC improvements

You can go into the settings via bluetooth to adjust the current. I would not draw more than half of your alternator's rated output.

 

[bruceb58]

Not understanding protection of the Suzuki charging system being needed. Why?

A LiFePO4 battery, depending on the battery, can absorb over 100A. No outboard alternator could source that much current without damage.

 

[boscoe99]

A LiFePO4 battery, depending on the battery, can absorb over 100A. No outboard alternator could source that much current without damage.

Mercury Marine has approved a number of models for use with lithium batteries.

Although not approved by Yamaha, Suzuki, Honda or Evinrude, a number of owners of those brands are using lithium batteries with no ill effects.

 

[bruceb58]

Mercury Marine has approved a number of models for use with lithium batteries.

Depends on the battery. Some Lithium batteries that are rated for use to start engines are designed not to accept their max capable charge.

 

[bruceb58]

Mercury Marine has approved a number of models for use with lithium batteries.

Although not approved by Yamaha, Suzuki, Honda or Evinrude, a number of owners of those brands are using lithium batteries with no ill effects.

Kinda curious...you have any experience using lithium batteries?

 

[tpenfield]

Sorry to be late to the party . .

What is powering the inverter? (Engine battery(ies) ? I assume because of the mention of a Suzuki)

Is this a one-time need, or will it be on-going? If a continuous need, I'm with @bruceb58 on this . . . get a DC-DC charger. My 'rule of thumb' is to stay at or below 50% of the engine alternator rating.

Otherwise, as a one-time situation, the charger is your 'throttle' on this, as long as the inverter is up to the task.

 

[boscoe99]

Good day.
First post and I did a little searching first.......
I am looking to charge a 100AHr LiFePO4 via an Inverter and Battery Charger combo. I already have both.
My thinking is that the Inverter will isolate and handle the power for the Charger..
I know that this is kind of a 'Rube Goldberg' setup, but, as I said, I already have most of it and need to protect the Suzuki's Charging while charging the LiFePO4.. What am I missing?
Thanks for your thoughts.

Very true. Using battery current to produce current to charge a battery.