First question is what is the time frame your using the 250 AH, is it in a 24 hr period?
If so then 400 AH or so ought to be enough, because we can assume 1/2 of that or so between charge cycles.
The problem is the budget.
Forget LFP, that’s a fantasy on $2K.
Firefly is $5 an AH.
Good flooded can be had for $1 an AH.
I’m going to Firefly this year as well. I’m going with three L16’s which will give me 450 AH, but they cost more than $2,000. We use 150 AH between charge cycles, I have no idea of total usage. But if we go to bed
with them close to 100% then we will discharge them only to 75% SOC, before next charge cycle. If it looks to be a bad Solar
day, I’m not shy about running the Honda.
Those that want to or are running large as in many batteries connected in parallel ought to do some research
into paralleling batteries and it’s effect on charging
and drift in charge, and equalize often.
With a budget of $2,000 I would go with flooded golf cart batteries, lots of them. That would give me as many AH as will fit and it’s likely they can be found in the wild, it’s not likely that Fireflies can be.
Fireflies seem to be only a US thing as in it seems to be the only market, and even there all them are imported by one company? The Fireflies company history
is “interesting”. I believe it has gone bust twice so far? I wonder how deep it’s market penetration actually is and how much actual sales there are?
I’m going to try them, but I don’t think I would for a circumnavigation
, I think I’d want something that’s more available and tried and true, even if it’s not the latest tech.
Now before people start saying I’m bashing them, I’m not, but it’s one thing to be sitting in Fl cussing your batteries, and another to be doing so in the wilds somewhere