Lithium 12v 100ah battery

[housedavid1956]

Looking for guidance on the correct lithium battery to run accessories on my Lexus 470.
Will use battery system with switch to protect the battery. I want one that I can safely charge from the alternator.

 

[MechE30]

Looking for guidance on the correct lithium battery to run accessories on my Lexus 470.
Will use battery system with switch to protect the battery. I want one that I can safely charge from the alternator.

What do you mean accessories? Extra stuff you install like lights fridge etc? If so you can use any 12v lithium if it’s isolated. I use the starting circuit to feed a Victron 30a smart-DCDC charger. That dcdc feeds a 100a WattCycle lithium battery. Then my fridge and air compressor get fed from the lithium. Engine off and the dcdc knows to separate the circuits, therefore I can flatten my lithium battery and not worry.

 

[george_tlc]

For lithium you need to be more specific (li-ion, li-po, lifepo4)...

For vehicle use a safe chemistry to use is LiFePO4 (lithium-ferrous-phosphate). To extend the life you really should be using a DC DC charger that has a lifepo4 charging profile. I use a Wagan unit (25A max charging) that has both Solar (mppt) and Vehicle power inputs in a pretty compact form factor. As above, this kind of charger will automatically charge when the vehicle is running (or solar is present), simplifies wiring, sort of set and forget.

This kind of setup allows the lifepo4 to be fully isolated from the starting battery and can be it can be safely drained (I use an ecoworthy 100AH with built in BMS) thousands of times while maintain good lifespan.

cheers,
george.

 

[housedavid1956]

What do you mean accessories? Extra stuff you install like lights fridge etc? If so you can use any 12v lithium if it’s isolated. I use the starting circuit to feed a Victron 30a smart-DCDC charger. That dcdc feeds a 100a WattCycle lithium battery. Then my fridge and air compressor get fed from the lithium. Engine off and the dcdc knows to separate the circuits, therefore I can flatten my lithium battery and not worry.

I want to power a fridge and a fan. Some batteries say you need a special charger and just want to make sure that the battery I choose can be alternator charged

 

[george_tlc]

Again, you should use a dedicated DC DC charger that will charge your lifepo4 battery from the main battery. The main battery is charged by the alternator.

cheers,
george.

 

[housedavid1956]

For lithium you need to be more specific (li-ion, li-po, lifepo4)...

For vehicle use a safe chemistry to use is LiFePO4 (lithium-ferrous-phosphate). To extend the life you really should be using a DC DC charger that has a lifepo4 charging profile. I use a Wagan unit (25A max charging) that has both Solar (mppt) and Vehicle power inputs in a pretty compact form factor. As above, this kind of charger will automatically charge when the vehicle is running (or solar is present), simplifies wiring, sort of set and forget.

This kind of setup allows the lifepo4 to be fully isolated from the starting battery and can be it can be safely drained (I use an ecoworthy 100AH with built in BMS) thousands of times while maintain good lifespan.

cheers,
george.

Thanks George!

 

[efjayatee]

25A DC to DC Battery Charger

Description 25A DC to DC Battery Charger Purposefully designed to accurately and safely charge auxiliary batteries, the Wagan Tech Dual-Input DC to DC Charger series ensures your batteries are kept at optimum levels that will enhance performance and extend their lifespan. Our chargers can be...

wagan.com

 

[efjayatee]

Or just get a power station to run your fridge and fan. Price has really gone down on Amazon. Plus the power station into your vehicle cigarette lighter while driving and the fridge to your power station. Once at camp disconnect the power station to the cigarette lighter.

https://www.amazon.com/DJI-Portable-70-Minute-Charging-Generator/dp/B0CZ5RYBWW/ref=sr_1_10?crid=3UYHMDFUIN3P8&dib=eyJ2IjoiMSJ9.ybBPePzqfXxEf4pZgyw3jqrGJFFsxkSgol7mQtzGLwCzbmoXJRKffRq2dprb1SAGlbxwygYl7pKXx-uoMu2OWJhVrukarttozt7m7CpGbC2xVl4TqzJLOSJMje0rO9sRshAq1OA7d2s-IrinBxty_8sW-gBeMnDl1euOL6ulzTjOfNESDsB9ziUkn0GNDZEzul1ao9vcQin64GpS0qIlGm3TSFePfHp1NkTcJFm5Yg0.k0UcdGaKtjgaHWjGCxRoWKa-cUeX2EoVQRl7NMwAiQw&dib_tag=se&keywords=power%2Bstation&qid=1736135831&sprefix=Power%2Caps%2C204&sr=8-10&th=1

My Wagan 1800W power station last almost 5 days with a single charge to run my fridge!

 

[george_tlc]

Setup in my 80. 3D printed bracket and 'upgraded' battery hold downs. Pictures during install - no with final wiring connected.

cheers,
george.

 

[ike84]

A lot of lithium motorcycle batteries now have charging circuitry built into the battery, allowing them to be charged safely on any 12v source. I use one in my racecar (sourced from Amazon) as the primary battery and it works flawlessly. The only downside is a relatively low capacity (I think mine is 20ah), but you can easily do the math and figure out how long it would last for your specific setup.

 

[NearJetties]

Check out Redarc, 4wd 24/7, and Ronny Dahl on YouTube. They have great videos explaining all the options and pros/cons. Also check the Power Systems forum here.

An alternative is an Ecoflow Delta power bank system. These are a great option now that you can get an alternator fast charger for them.

 

[cbbr]

Are you guys running lifepo4 batteries under the hood? I am installing a Redarc dc/dc and trying to decide on a "house" battery.

 

[MechE30]

Are you guys running lifepo4 batteries under the hood? I am installing a Redarc dc/dc and trying to decide on a "house" battery.

No, rear cargo area. Lithium and heat are not friends.

 

[MechE30]

An agm would be fine under the hood though, and not bad for a house battery. Lithium is king though, with being able to discharge much lower than agm/lead-acid.

 

[cbbr]

I think that i am going to run an AGM under the hood and get a battery pack for inside the truck for the flexibility. I would love to find lifepo4 that would survive under the hood, but haven't yet.

 

[hoser]

There are finally many 100AH slim line battery offerings. Mount behind 2nd row seat or even on attic rack… or even on 3rd row window area. Still better than under hood.