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Recently Kings auto had an amazing price on a good brand 100A/h LiFePo4 battery, below $200 (maybe 70A/h, I can't remember). There is no such establishment nearby and I know a local friend with a business has an account and I was going to get him to buy one in for me. Unfortunately I couldn't get in touch with him and I missed out and my next check it had jumped back up to over $300.
Very recently Aldi had a LiFePo4 battery on special, the VoltX which is said to be a top brand, I can't remember it's capacity but it was $499.
Some places sell the individual cells and you can mix and match up to your own desired capacity with parallel and serial connections. I've looked into going down that exact path myself until I read so many reviews where many sellers were selling used cells for near new prices and decided to stay clear of the theoretically good deals.
In saying that I've also seen mention of Bluetti and other brands on this forum where they have performed flawlessly and are often on special. Dependant on required capacity a good deal may be possible, higher capacity units have higher prices obviously but it's a warranted complete package. NO, I am not affiliated with Bluetti (the only one I know because I have tabs open everywhere for their equipment), I did the maths and realised the ready to go packages are good value.
Though I would suggest it's worth reading some of the self builds, lead acid are reasonably cheap if you don't have to carry them. I need mine to be portable so I can chuck some gear in a car and go (and carry it up mountains) but if it's just on your own property a small trolley makes the heavier, cheaper battery very viable.
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