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RV solar






#21
Ya know, for having built buildings for 40 years, I realize it’s the stuff like this that squeezed by me. So let me see if I got this right... I have 81 ah @ 12v. That’s 972 watts. So, if the fridge consumes 11 watts, I can power it for 88 hours?
 

MAC702

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#23
...So let me see if I got this right... I have 81 ah @ 12v. That’s 972 watts. So, if the fridge consumes 11 watts, I can power it for 88 hours?
Again, you've got to keep the units straight to avoid later confusion.

81 A-hours x 12 V = 972 W-hours, not just watts.

Then, yes:

972 W-hours / 11 W = 88 hours.

Minus all efficiency and less-than-ideal production losses, of course.

What's the start-up power on the fridge?
 
#24
Again, you've got to keep the units straight to avoid later confusion.

81 A-hours x 12 V = 972 W-hours, not just watts.

Then, yes:

972 W-hours / 11 W = 88 hours.

Minus all efficiency and less-than-ideal production losses, of course.

What's the start-up power on the fridge?
I’m going to put a meter on the cord today and check what everything draws. The boss says she needs a/c and coffee at minimum, so maybe I’m getting into generator country
 

MAC702

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#25
What are you calling a "fridge?" Is it using electricity (11 watts?) just for controls? A typical RV refrigerator, running on electricity for cooling will be in the 180 watts ballpark. And then it might need 600 watts to start the compressor.
 

Mikeee54

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#28
I believe that model is a 3way 120/lp/12v typically propane is not used in 12v mode on 3way models.
 

Bumper

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#30
And if you put in a large inverter/battery charger, so you can have 110 VAC without running the generator, then the fridge will pull about 30 amps from the battery bank while it is cycled on. Running the microwave, in the same manner, pulls an astonishing 170 amps!! I run the fridge on AC when driving, as it's one less potential ignition source in case of an accident (the absorption fridge has an open propane flame).
 

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#39
Says the guy that linked to a website selling complicated systems to DIYers with "no experience required."