The batteries alone have actually gotten quite affordable. https://signaturesolar.com/eg4-lifepower4-lithium-batteries-kit-48v-100ah-x-6-30-72kwh-6-server-rack-

The batteries alone have actually gotten quite affordable. https://signaturesolar.com/eg4-lifepower4-lithium-batteries-kit-48v-100ah-x-6-30-72kwh-6-server-rack-batteries-with-pre-assembled-rack/ https://signaturesolar.com/eg4-lifepower4-lithium-batteries-... Here is 30kWh of LFP batteries for $9,000. Now that doesn't include the inverters or installation or anything but LFP batteries have excellent longevity, in this case 7000 cycles to 80% depth-of-discharge. That means charging and discharging the battery every day for 19 years and at that point, you still have 80% of the remaining capacity.