My solar-powered blog is now on lithium iron phosphate
I ran a similar off-grid system for 10 years (starting in 2003), but mine was of a somewhat larger scale.  The server consumed about 400W and I had 1280W of solar panels.  I started with lead-acid deep-cycle marine batteries, but later switched to sealed AGM because they did not vent hydrogen while charging.  Admittedly, it was not 100% off-grid.  I had a 50A 12V DC power supply on-grid that could power and&#x2F;or charge the system if needed.<p>I switched the marine batteries out after about four years of operation.<p>I took down the solar panels in 2013 because the roof needed repair.<p>If I were doing it today, I would probably give Lithium-Iron a try.  They weigh less, have higher power density, and last longer.