12v Refidgerators
I have been looking at new TTs and have found that quite a few have 12v only refriderators. Has anyone used these while boondocking? How long will they run on solar? I have 400w of solar panels and ...
Forum Discussion
2oldman wrote:wolfe10 wrote:Yes, but he said "amp hours"
Double the voltage and amps are halved to produce the same watts.
12v at 1 amp for one hour= 12 ah
24v at .5 amp for one hour= 12 ah
A more appropriate unit would be watt-hours if you want to get technical. Please tell me if I am wrong.
Amp-hours are a measure of charge, not energy; one amp-hour is 3600 Coulombs (as a Coulomb is defined as an amp-second). At a basic level, charge is a count of electrons; one amp-hour is equivalent to 2.25 x 10^22 electrons. As such, the voltage is not involved at all.
1 A for 1 hour = 1 A * 1 h = 1 Ah
0.5 A for 1 hour = (0.5A * 1h) = 0.5 Ah
Energy, measured in watt-hours in this case, can be found by multiplying charge by voltage, and this is a more appropriate unit to use when comparing systems with differing voltages, as you mention.
1 A at 12V for 1 hour = 1 A * 12 V * 1 h = 12 W * 1 h = 12 Wh
0.5A at 24V for 1 hour = 0.5A * 24V * 1 h = 12 W * 1 h = 12 Wh
