LL and lifepower4 24V batteries in series for a 48V inverter

As you mentioned, this configuration is not recommended as these batteries were not made to work together in series. To ensure system stability and avoid potential issues—both immediate and long-term—it’s best to avoid connecting them in this manner. The best option would be to purchase 48V batteries.

I would not connect them in series for a 48v system, I would look for an inverter that can

work as 24VDC, either single phase or split phase, whichever is most important to you.

Or buy new batteries and use your old stuff for less important things.

DD

I have a similar question. I have 4 EG4 Lifepower , 24v 200ah batteries I bought from you guys with the intention of putting together a battery rack when I could afford a good inverter for home backup. My plan was to save up for a Sol-ark, but When I saw the specs on the the EG4 18kpv inverter I purchased it. Now that I'm ready to but the rack together, I read now that I can't use the 24 v Lifepower batteries in series to work with your 48v inverter, so that sort of submarines the entire plan. 

Does EG4 sell or recommend an inverter that is compatible with those 24v Lifepower batteries, or are they just expensive paperweights at this point? 

EG4 does not have an inverter system for 24v.
I have been using 24v for many years, although I use it as
a basic UPS, just offline as long as the batteries last.

I am using an Ampinvt Low Frequency 3k Pure Sine Wave Inverter,

and an Ampinv 60A Solar Charge Controller.
This company also makes a 5K & 6K inverter.
Let me also say that this is not a whole-house system.
Use at your own risks.

or trade/sell the 24v batteries for newer 48v
and build from there.

DD