I made my blog solar-powered, then things escalated
Tip to OP (I think they already have this idea, based on the post):  when that lead-acid battery dies, replace it with a LiFePo4, which is <i>substantially</i> more efficient, lasts 3x as long, has a higher energy density, provides a usable voltage far further into its discharging %, etc. etc...  A couple pages that describe the differences linked below...<p>tl;dr if you are starting a solar battery project, LiFePo4 is the clear choice by far, unless you're going for the absolute cheapest possible build due to immediate budget constraints.<p><a href="https://www.canbat.com/a-detailed-comparison-of-lead-acid-batteries-and-lithium-iron-batteries/" rel="nofollow">https://www.canbat.com/a-detailed-comparison-of-lead-acid-ba...</a><p><a href="https://www.power-sonic.com/blog/lithium-vs-lead-acid-batteries/" rel="nofollow">https://www.power-sonic.com/blog/lithium-vs-lead-acid-batter...</a>