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Newbie Safety Check - 400 AH LiFeP04

Scott Hartwick

New Member
Joined
Jul 23, 2024
Messages
5
Location
Tustin, CA
Hello Everyone,

Newbie here seeking a general safety check.

2, 100-watt panels on Victron MPPT 100 / 30 Charge Controller

4, 100 AH Redodo Lithium Batteries. Connected in parallel with 2 feet of 2 AWG cables. Every positive terminal has a 100-amp terminal fuse block.

System is connected to a basic 1,000-watt inverter and runs to a small 12v fuse block for my 12v lights, water pump and other smaller items.

On average, I'm generally only drawing a total of 200-300 watts from my inverter which powers my entire rig. A low-wattage draws microwave and electric tea kettle are my biggest occasional draws which are generally around 700-850 watts.

I eventually plan to build a more secure enclosure for the system. I frequently run full loads and check for any rising wire temperatures. Never any issues but always open to improving safety.

Thank you!
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Positive connectors for 12v fuse panel, Victron Charge Controller and switch for inverter are on far back left battery.

Negative connectors for the same connections are on the oppositive far back right battery.

There is a generic 10-amp lithium charger controller in back which is used sparingly.

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30 Amp main disconnect switch for solar.

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Basic 12v fuse panel from battery. I originally started with a Renogy charge controller but kept inside the rig as a spare. Running a cheap 10-watt interior panel just for the fun of it. I will eventually clean up the wiring.
 
Last edited:
This breaker is a cheap audio breaker and should be replaced with a quality breaker. Looks like this breaker is a solar cutoff switch?

Screen Shot 2025-03-20 at 10.58.43 AM.png
 
4, 100 AH Redodo Lithium Batteries. Connected in parallel
Its hard to tell if these are wired in a balanced manner. Read the first 4 posts of this thread:

 
Its hard to tell if these are wired in a balanced manner. Read the first 4 posts of this thread:

Thank you! Yes the breaker is used as a solar shutoff switch but will replace with a more quality breaker.

All four batteries are connected next to each other and all connections for positive in negative are on far opposite sides. Similar to this configuration. Thanks again!

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Thank you! Going to upgrade breaker and utilize the configuration below moving forward. Safety is my main priority and fairly new to all of this. Appreciate the feedback!

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make sure every wire is protected by appropriate OCP
suggest a Class T fuse on main positive cable close as possible to battery after 4p connections
 
Thanks for all the suggestions. Added a 100-amp T-Fuse and fuse box closer to main battery bank. Going to upgrade jumper cables with permanent attachment points but used what I had for the time being.

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with permanent attachment points
Connecting to the middle 2 batteries of 4P?

Read first 4 posts in this thread for explanation of battery currents and suggested wiring:

 

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