Storage is always costly. If you can DIY, you can save 20-50%.
And you can join my Solar Sovereignty Simplex group if you want to discuss things to a greater depth.
Discussion
nostr:npub1q6ya7kz84rfnw6yjmg5kyttuplwpauv43a9ug3cajztx4g0v48eqhtt3sh how might do a backup DIY storage pack without solar?
The easy way is to get a 12V inverter that hooks up to your car battery. I went with 1500W, it will power my chest freezer, router and a phone charger with capacity to spare. Keep it in your car with an extension cord and power strip. When needed, hook it up and run your stuff, idle the car as needed to keep the battery up.