Important things to remember:
3. Do not use water with a high mineral content. Use distilled or deionized water only.
…Distilled water is preferred but local water (not chlorinated) maybe acceptable if it is not "hard" or does not contain high iron levels. Use of non-distilled water can cause mineral build-up in the battery cell.
VolcanoSolar wrote: »
the only way it would make sense to do an electric distiller off-grid is on days when the system is topped off and the sun is still shining -- not too many days like that though (2,000 watts of panels / typically 8-12 kwh/day total)
Brock wrote: »
You can get TDS meters on eBay pretty cheap, just search "tds meter". It will let you know how your R/O is doing anyway so I would strongly recommend getting one. If your TDS was under 25 ppm I might use it in a battery, 50 might be pushing it. For reference in our last house our well water had a 1850 ppm of TDS, after the R/O it was close to 120 ppm TDS I actually had a second R/O behind then first for a while, that brought our water to about 20 ppm.
mike90045 wrote: »
You could look into a solar water distiller (thermal, not electric) say a black 20 gallon cement mixing pan, and old sliding door (for the glass) and a collection trough.
or here are some other plans for a homebuilt: