Well.. I hate Will P. for posting this video.
I was all convinced that I needed to spend the $300/KWH for EV4 rack batteries , especially since they are now fully UL approved and listed. He has all ready indicated that they are "taking over" the DIY battery arena, and for that low price, why bother building a roll your own battery.
Then Will Posts this video... which kind of contradicts his just buy a rack packaged battery pitch.
30Kwh of batteries on a cheap but heavy duty $200 shelf in his garage. BMS , hanging from zip ties, Class T fuse for safety, none of the batteries in a case , no compression, just batteries on a rack charging his Tesla. Sheesh....
He even pitches this as a nice big whole house UPS.
I know DIY is more work.. but I bet if you had all the components listed in that video you could build that rack of cells, with the cables in 1 day or less.
So.. the amount of DIY effort is quite small.
But when I do the math.. to Get 30Kwh of EG4 battery storage, I need to buy 30*$300= $9000 dollars in EG4 rack batteries....That's a big chunk of change.
I just got a quote from Docane power on batteries delivered to my house from China, and the price is $129 per 280Ah Eve battery. (or 15% premium for US sourced batteries shipped from Houston if I needed them quickly)
So 32 batteries delivered for $4100, + $200 for the Rack, + $200 for 2 BMS, plus $70 for 200A class T fuse, and another say $400 for cables, and I am at around $5000 for 30Kwh of home built storage.
$5000/30KwH = $167/KWh vs $300/KWh for the Rack solution.
Or 17 cents per Wh DIY, vs 30 cents per Wh for EV best price rack solution.
45% less.. cost for the battery storage with very very limited DIY effort.
A savings of $4000 that can be used to purchase an AC coupled inverter I need for my recently installed Enphase Solar Array.
So if I go with the brand new Sol-Ark hybrid inverter , 15Kw at $8000, I can have an inverter large enough to run my entire house , and 30KwH of home built batteries for $5000, a very nice AC coupled solution and large battery backup for $13,000
Compare that investment to calling up the OEM battery sellers and asking them to come to my house and install 30KWh of batteries.
Now I need to make some decisions.
Does anyone think the setup Will shows will catch fire, or blow up, because my wife would be very unhappy with me if I went down that path and put that rack in my basement?
Could I mount some kind of fire extinguish (Halon?) above that cheap rack and add some level of safety?
I cannot imagine why it would be in any way dangerous but.. I need to ask that question.
Thanks Will...