Not saying that anyone is wrong when it comes to pricing. But no matter the way i break the math down, its cheaper to can my own green beans by $1-$2 per quart jar
this assumes im using:
my pressure cooker that accommodates only 4 quart jars
$1.20 jars from walmart
10c/kwh for 90 minutes
water and pickling salt only come out to like .006 buying a 3lb bag from walmart
the beans per jar would only cost about .45-.60 based on th retail of bushels near me
and theres a ton of wiggle room here to adjust the value, i worked it on the higher end. it doesnt account for jar/ring reusability, and assumes the lid top would be one use, and doesnt take into account any bulk discount for any of the individual items, using cheaper fuels, or larger scaled canning method.
th only real cost i can see here is in personal time. which i dont see as a great way to measure it. because while a person could potentially make 100 dollars an hour doing something, that doesnt account for a persons “down time” has little value. otherwise it wouldnt be down time, you would be using it proactively.
if i were to use a hot water bath process and use the entirety of my stove i could potentially do batches of 16-40 quart jars at a time depending on the size of the pot. in a 6 hour period canning a potential 64-160 jars. this allots each batch at 90 minutes, even though the beans realistically only need 20-30 minutes in the water once hot. i added the extra to account for water heating and other prep time
so with a saving of between 1.29 to 2.04 per can that is a saved that is a potential for up to $326.40 including all costs in the 6 hour period. (but it could also be as low as 83.85 assuming you can 4 cars per burner on a normal stove on the low end)
NOW FULL DISCLOSURE: i know there is a lot of wiggle room in this math, but the savings could be a little more depending on the time invested sourcing large batch discounts. 16 jars at a time, i feel is a very reasonable number for someone who is “bulk” canning on a small scale. and a savings potential on the small assumption of $80+ dollars in one day for 4 batches of 12 cans feels pretty reasonable.
now i could be off a little here and there, but no matter how i math it, it just keeps coming out as worth it. both money wise and health wise. the only way it doesnt work is if someone is only doing like 1-4 cans total in a day, and paying WAY too much for the consumables. because the majority of my pricing was online sources. the only item not was the bean prices, and i have been getting my beans for the last couple weeks from the Amish near me. but there are a few farms that i would always be able to use too. the price is higher right now ofc because its out of season here, but the point of canning is to preserve it ahead of time.
also important to note that the size by size saving would only be like .20-.30c for a normal sized store can. but the quart jar can hold potentially 3-4 times the amount quart compared to can. if you were doing this in smaller jars, it likely wouldnt be worth it because of less beans per jar/lid cost