Li batteries

[thomas phipps]

I'm thinking of Li battery pack for the house batteries. Any opinions on using a Li battery with combiner attached to SLA battery?
Willing to give up the SLA as it is ageing out.
I am will aware of the different charging cycles. Without changing charger, Li battery would only be about 80% charged. I can live with that.
Tom
--
2012 Phoenix Cruiser model 2552
KA4CSG

 

[richshoop]

If you change out the existing battery for a different chemistry, be SURE to disable the battery boost switch! Paralleling different types of batteries does damage to both!

>
>
> I'm thinking of Li battery pack for the house batteries. Any opinions on using a Li battery with combiner attached to SLA battery?
> Willing to give up the SLA as it is ageing out.
> I am will aware of the different charging cycles. Without changing charger, Li battery would only be about 80% charged. I can live with that.
> Tom
> --
> 2012 Phoenix Cruiser model 2552
> KA4CSG
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:

 

[bdub]

This is what I use.
https://battlebornbatteries.com/product/lifepo4-battery-isolation-manager/
And for a charger,
https://www.boatandrvaccessories.com/products/progressive-dynamics-pd9180alv-12-volt-80-amp-lithium-power-center?gclid=CjwKCAjw_sn8BRBrEiwAnUGJDsjEnvefRGwxbOeNBuQsuxDX8Dm0hX0hwZOIgXP33V39sV3jLfH2eBoCeasQAvD_BwE

I still use the OEM battery boost switch.
bdub

> I'm thinking of Li battery pack for the house batteries. Any opinions on
> using a Li battery with combiner attached to SLA battery?
>
>

 

[Larry Davick]

Tom,

As fast as the price (and quality) of lithium batteries is falling this presentation from Jerry Work is already somewhat dated. Still his advice about BMS and the need to update your cables still holds.
(http://gmcws.org/blog/lithium-battery-presentation-gmcws-2019-fall-rally/)

Larry Davick
1976 Palm Beach

>
> I'm thinking of Li battery pack for the house batteries. Any opinions on using a Li battery with combiner attached to SLA battery?
> Willing to give up the SLA as it is ageing out.
> I am will aware of the different charging cycles. Without changing charger, Li battery would only be about 80% charged. I can live with that.
> Tom
> --
> 2012 Phoenix Cruiser model 2552
> KA4CSG
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:

 

[Carl Stouffer]

I believe you'll need to invest in a B.I.M. like Billy stated. According to Jerry Work's presentation, you should be able to get an add-on module for
your current converter/charger.

I think the B.I.M. takes the place of the isolator and likely eliminates the combiner as well.

Also, according to Jerry, the boost can be used momentarily without hurting anything.

I plan on doing the above soon as well, and upgrading my cabling at a later date to add more efficiency.
--
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles,
Solar battery charging. GMCSJ and GMCMI member

 

[RF_Burns]

Tom,
Here is an excellent article about LiFePO4 (LFP) batteries. It's written for boaters, but it applies to RV's as well. Its a few pages, so get a
coffee before you start.

https://marinehowto.com/lifepo4-batteries-on-boats/

An LFP battery has a very low internal resistance and needs to be charged with a constant current, then finished with a constant voltage, then its
charges. Since LFP has a very low self-discharge, there is no "float" charge required... but since we have equipment connected to the house battery
(fans etc), a float charge of about 13.5V is Ok as long as it isn't connected during storage.

Automotive alternators (until recently) are a constant voltage output, so a LFP battery in a lower state of charge will suck all the current the
alternator can deliver and quickly burn it out. A BIM is like a long cycle PWM regulator. It connects the LFP battery to the chassis for about 15
minutes, then disconnects for about 20 minutes to let the alternator cool down.

I went with a DC-DC charger instead. It takes the DC power from the chassis (alternator) and converts it to the proper Constant Current/ Constant
Voltage/ Float voltage charge curve that the LFP battery requires for longest life.

JWID

--
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that