Help needed. 12v 4000w inverter & 12v 400ah lithium battery

[Jbones]

I have 800w of solar wired for 12v, and a new 12v 4000w pure sign wave inverter.
I also have a12v, 400ah lithium po4 battery.

Can I buy another 400ah 12v lithium battery, wire them for 24v & use the 4000w 12v inverter, or do I have to stay with the batteries wired for 12 volts?

If I can use the 12v inverter with a 24v battery supply, will I have to rewire the solar panels to 24v?

[twinboat]

You can't use a 12 volt inverter, or anything else with 24 volts.
Wire the batteries in parallel, suppling 12 volts with 800 AH of capacaty.

[shoreco]

Keep the batteries in parallel and remain 12v

[Jbones]

Thank you. Obviousl, this solar instalation is all new to me. After I get it all is installed, I will have it checked by a qualified solar tech before activating it.

[SafariBen]

You already have a lot of battery for that amount of solar, what are you trying to do that more battery will accomplish?



Every battery maker I've seen says to never mix batteries of different ages, I don't know if that info is out of date or not? don't mix different brands if at all possible.

[Jbones]

I was asking about adding another battery if I went to 24v. Since I can't go to 24v there is no need for another battery at this time.

Eventually, I might add more solar pannels, and if I do, I might consider adding another battery of the same type, which would eventually give me 800 ah of storage if needed.

[TravelSolo]

The solar voltage is independent of the battery voltage. The solar charge controller takes the solar input however it comes in, then converts that to the battery voltage you program (or it senses).

If you change from 12v battery to 24v battery you need to get a new inverter that will accept 24v since there is no efficient and inexpensive way to convert the 24v to 12v at the amperages the inverter can pull. So stick to 12v unless you want to change more components and add a DC-DC to drop the 24v to 12v for the trailer house circuits use.