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--- opinion:frater_secessus:run_this_load [2024/05/09 19:44]
frater_secessus [watt-hours]
+++ opinion:frater_secessus:run_this_load [2025/02/10 18:15] (current)
frater_secessus [recharging afterward]
@@ Line 1: / Line 1: @@
+[also see [[food:refrigeration:power|How do I run a 12v compressor refrigerator?]]]
 ====== What will it take to run this load? ======
@@ Line 6: / Line 8: @@
 There are several factors:
+  - AC vs DC, voltage.   typically 12v**dc** or 120v**ac**
   - current (power), in Amps (A)
   - Watt-hours (Wh) ((or Amp-Hours)) (energy)
   - any [[electrical:12v:power_mix|charging sources]] that are active at the time
-  - recharging afterward
+  - **recharging afterward**
 And a couple formulas we will use to convert units back and forth:
@@ Line 18: / Line 21: @@
 [[opinion:frater_secessus:pareto|about these summaries]]
+===== AC/DC =====
+Using the US as an example:
+  * wall outlets are 120v AC (alternating current).  In a van this kind of load will have to be run off [[electrical:shore_power|shore power]] or [[electrical:inverter|an inverter]].
+  * most vehicles run on 12v DC (direct current).  Very small 12vdc loads (≤120w or 10A) can be run off the 12v outlet.  Larger loads will be run off [[electrical:12v:intro|an aux power setup]].
@@ Line 49: / Line 61: @@
 ===== watt-hours =====
-Energy use is often done in Watt-hours, although Amp-hours will also work.
+Energy use ([[electrical:12v:dailypowerrequirements|daily power requirement]]) is often represented in Watt-hours, although Amp-hours will also work.
@@ Line 66: / Line 78: @@
 ===== recharging afterward =====
+This is the part that people often forget (or prefer not to think about) in the planning stage.  Yes, your power station with a 1500w inverter can run that 1500w load for an hour, but **if you can't recharge it then it can do this trick only once**.   It's like paying rent:  being able to afford the first month's rent out of savings is one thing, but one needs income to keep paying the monthly rent to keep living there.
 If you are recharging LiFePO4 the 173Wh used is basically what you'd need to recharge that battery to its former state of charge.

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