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--- electrical:solar:sizing [2023/03/09 13:10]
frater_secessus [calculators]
+++ electrical:solar:sizing [2024/07/16 10:58] (current)
frater_secessus [your reserve needs]
@@ Line 79: / Line 79: @@
 ===== your reserve needs =====
+[see also [[electrical:autonomy|days of autonomy]]]
 > ...one that really [effed] with me was running out of power or spending a few days in the dark cause the weather is bad. -- hellexual((https://www.reddit.com/r/vandwellers/comments/er4gf7/whered_you_get_your_van/ff1i66p/))
@@ Line 84: / Line 86: @@
 Solar power is highly dependent on local conditions like weather, season, and latitude.  One cannot assume getting a full charge every day in every condition.
-To account for this decide how many reserve days of power((https://duckduckgo.com/?q=days+of+autonomy&t=ffab&ia=web)) you need if there is little [[https://www.wholesalesolar.com/solar-information/sun-hours-us-map|solar power available]].  You may need few in desert regions and many more in the Pacific Northwest.  Long stretches of little solar charging may necessitate
+To account for this decide how many reserve days of power(("days of autonomy")) you need if there is little [[https://www.wholesalesolar.com/solar-information/sun-hours-us-map|solar power available]].  You may need few in desert regions and many more in the Pacific Northwest.  Long stretches of little solar charging may necessitate
 [[electrical:solar:rationing|rationing solar power]].
@@ Line 148: / Line 150: @@
       * Inversion from 24vdc to 110vac is more efficient than inversion from 12vdc.
     * You have large, power-hungry appliances that can run natively off of 24v
-      * Some [[food:refrigeration|DC refrigerators]] can run off of both 12v or 24v, and are slightly more efficient when running off of 24v
+      * Some [[food:refrigeration|DC refrigerators]] and induction cooktops can run off of both 12v or 24v, and are slightly more efficient when running off of 24v.
+      * [[hvac:solar_ac|Off-grid Air Conditioning]] can be slightly more efficient with 24v native systems, and will allow smaller wires to be used.
     * You have a lot of long, large cable runs
       * 24v doesn't have as much voltage drop as 12v over a similar distance, and can use smaller/cheaper cables.
@@ Line 159: / Line 162: @@
 ===== solar panel array =====
-Pick a solar panel array output on battery bank capacity.  A common **rule of thumb for matching panels to battery bank** is that there should be **at least** 1 panel watt per amp-hour of nominal bank capacity.
+Pick a solar panel array output on daily power requirements and  battery bank capacity.  A common **rule of thumb for matching panels to battery bank** is that //at a minimum// there should be 1 panel watt per amp-hour of nominal bank capacity.
 > "...the person draining their batteries to the 50% range regularly would do much better with a 2 watts to 1Ah ratio, or even 3 to 1." -- SternWake((http://www.cheaprvliving.com/forums/Thread-How-much-solar-do-I-need?pid=278438#pid278438))

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