What About LiFePO4 Batteries and Pure Sine Wave Inverters?

Lots of threads on dedicated AC circuits, but not much information regarding DC to AC battery driven systems. I never considered this as a power option because I assumed that the inverter would be noisy, but is this true? The setup is pretty simple where an AC/DC charger has the negative lead attached to the battery and the positive passes through an appropriate fuse on the way to the positive terminal. The on/off function can be a simple removal of the plug from the wall, or a smart wall plug. The charge state can be read from the charger, or you can add a wired, or Bluetooth battery monitor. The battery then feeds the inverter with a much larger fuse on the positive line to the input of the inverter. Your system is then plugged directly into the inverter, or at least your power conditioner is plugged into the inverter. Depending on battery capacity and system power usage, you can then run off the grid for many, or not so many hours. The problem is that it is difficult to find advice on such a power arrangement here on Audiogon. I’m just now putting together a system and I’m thinking that for better lithium battery life and shorter charge times, I want a larger capacity battery that I charge to 80%. I might also want an inverter that is oversize compared to the load that it experiences, in that most inverters turn on their fans when they reach 40% of their max power, or reach thermal trigger levels. The latter makes me think that mounting to a large aluminum surface might be thermally advantageous. Perhaps, someone that actually has some experience with this subject could offer some pointers.


I’m up and running on battery.

Does your system sound as good in the day as night? There has been a lot of conjecture why stereos sound better at night than day. Battery could eliminate one variable.

Juan has more time listening. I’m new to off grid listening. As mentioned, I didn’t have a dedicated circuit. I no longer need to turn off air filters and lights in other rooms while listening. Also, no issue with last night’s thunderstorm and lightening. I have a whole house surge protector and my battery charger plugs into a large local surge protector. I don’t care if it’s “audiophile grade”. The charger is off while listening to music.

I’ll take this opportunity to mention that I have been leaving my components switched on and once the.battery is charged the charger trickle charges to support the system’s sleep mode.

For the few that care, I’m getting almost eight hours of play time on my 300ah battery. You can see my equipment associated with my profile. My charger is controlled by a KASA wall outlet. It charges and then provides a trickle charge. I turn it off to play music. While playing, the SmartShunt allows me to monitor the battery via Bluetooth. I have included below one page of information from the SmartShunt during playback.

Battery Monitor


Again, remember that some knowledge of simple electrical circuitry is required.  With unsafe practices, you can start a fire (main issue here is the cable gauge), or electrocute yourself.

@vonhelmholtz Looks like a user friendly control system.  I was a bit confused by your numbers until I realized your battery is 300ah at 12V.  So that is 30ah at 120V.  Your 238 watts is basicly 2 amps at 120V so you would be getting 15 hours at 100% efficiency so your inverter and other losses are costing you about 50% which I would say is about normal.

Glad you're finding it easy to use.