Cost - For the +24 mi Total Cost (with the Delta Max)2khz + 2 batteries and cables, etc) is approx. $3,250 (bought refurbs) (would be less with 1 or 2 batteries)
Concerns
I fit them all in my trunk, However, the problem is that they are heavy - not too heavy - I'm can carry 2 at a time, but they're way too heavy to want to be taking them in the house every day to charge and then back out. So it's a must to have an outdoor outlet so that you can leave them in the car and charge there.
i.e. the big piece remaining to resolve is the overnight charging
If I had one, I would plug the batteries into the AC outlet, and the Leaf into the batteries - and confirm that doing so would provide enough time to charge both overnight. The batteries charge relatively quickly (I didn't time - but I think what they listed on their website seemed reasonable) but still it might not be enough time
I'll have the same Q if I switch to the Pros. The 2 advantages are (a) can link 2 Pros together to provide a 220v outlet - and charge in half the time and make it possible to do overnight (b) I won't have to have an outdoor outlet installed, and can use my car charger to recharge the batteries, and plug the Nissan into that. This would increase my cost by $1k.
Another concern is aesthetics and convenience - I'll have to streamline the plugs so the aren't an eye sore and don't take time.
Pros
re: given that my battery doesn't comfortably make a round trip to / from work. I see my options:
(a) buy a new car with enough range - approx. $15-20k for used - approx. $4-5k for selling mine = $10k - $15k
(b) buy a new battery - approx $13-$15k for 40KHz, (I'm guessing for 24Khz size probably won't have more miles remaining than mine anyway
(c) the EcoFlows - approx. $4k. Another perk is that they have a smart Generator that takes solar or propane for $1k that I can connect to the batteries and have propane generator for long power outages (common in my area). I think a stand alone propane generator is normally $2k. Also, with this I don't feel like I'm investing in an 11 year old car. i.e. I can use these with my next EV, or just resell them
So far I'm excited, we'll see how it goes (I have no affiliation with EcoFlow)
Also - note - their website has a VERY small window to return items, but their ebay listing allow longer.