Charging Li-Ions batteries

pianotuna wrote:
2oldman great choice on the inverter! Is it hybrid as well (i.e. load support) 48 to 120 is easier, too.

Not to my knowledge is it a hybrid. 3400w. I think inverting from a higher voltage is easier, but, it does take more power to run itself.

2oldman great choice on the inverter! Is it hybrid as well (i.e. load support) 48 to 120 is easier, too.

pianotuna wrote:
A DC48 to dc 12 buck for operating house loads..
A new inverter with 48 volt input

It's nice to have the 12v house be between 12.7 and 12.9 all the time.

I was replacing 12v inverters about every 4 years, kinda like batteries. This new 48v Outback is built like a tank, heavy, and should be the last one I ever buy.

"A way to keep the li from freezing or relying on a heating pad." and for me..there-in lies the weak spot. I live in BC and right now, as I type it is -3, feels like -10 and has a good bit of overnight snow.

I prefer the KISS way of doing things and having to add a heating element, that must in turn be powered for "2 hours prior to beginning charging" is just trouble looking to happen.

Thanks for your input folks.

Gary

Gary,

If I were going to do Li I'd be tempted to jump to 48 volts a la 2oldman.

Of course that means getting the following:

a dc 12 to DC 48v boost @ 60 amps for alternator charging

A DC48 to dc 12 buck for operating house loads

a new converter or battery charger for 48 volt

A new inverter with 48 volt input

If staying within the 12 volt parameter then:

a dc12 to DC boosted ~12 for alternator charging to prevent overloading the alternator.

A replacement converter or battery charger that meets the needs of the particular Li batteries.

A way to keep the li from freezing or relying on a heating pad.

Hi Gary,

The best bang for the buck I've seen for li is here:

https://ablithium.com/

$400 for a 100 amp-hour unit with bms in place.

But never freeze them up.

wa8yxm wrote:
Ok if you have a rechargable battery.. ANY Type. what you need is the proper charger.. Not too fast, not too slow.. Proper voltages and so on. And they make chargers for the batteries Some the charge controller is part of the battery Package) https://bioennopower.com/ for example I believe (and I stress that word Believe) makes them that way.. Do not know about battle Born but I believe (Again stress that word) they have a deal with Progressive Dynamics.

Okay..thanks for this....

Gary

Ok if you have a rechargable battery.. ANY Type. what you need is the proper charger.. Not too fast, not too slow.. Proper voltages and so on. And they make chargers for the batteries Some the charge controller is part of the battery Package) https://bioennopower.com/ for example I believe (and I stress that word Believe) makes them that way.. Do not know about battle Born but I believe (Again stress that word) they have a deal with Progressive Dynamics.

time2roll wrote:

garyhaupt wrote:
Reading up some on the topic and charging a bank seems to be an issue. Is anyone familiar with this application in the RV world? and or sail boats?

A bit of backstory...my S-I-L is planning to build a bank for his sailboat...to power his electric motor. He is offering to build me a bank for my RV and I have been 'encouraged' by one of our members, to do a bunch of research. So..doing that as well as asking here.

I don't think there is any issue with charging a lithium battery to a set voltage to match the required specification.

The real issue is the BMS to balance the cells, limit charging current, limit discharge current, limit high and low voltage, etc. All of which changes based on temperature.

I think most RVers use drop in batteries although a few roll there own.

Are you building a battery from individual cells and connecting your own BMS/controller?

I don't have the foggiest idea....he is building his own..at least that is his plan..and offered to build me a bank as well. I was 'assuming' that I didn't have to understand anything more than I already do with 12v..which..things work or OMG the batteries are dead..now what? I posted my question hoping it was going to be an easily understood answer..now, I see that I must turn to a mind booster....will that be Makers Mark or Knob Creek...

Just as an aside...they have bought a 30ft 45 year old CnC and the engine is rusted to rat s***. Now out..they are heading for an electric motor with a rack of solar and bank of batteries. I have the motor link if anyone is interested..the name is Thunderstruck.

Gary

also son in law.