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Old 03-19-2020, 08:41 PM   #41
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Here you go Tim................

Totally sweet!
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Old 03-19-2020, 08:44 PM   #42
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"Amp-hours" is correct for battery capacity.

How do you specify charging rates?
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Old 03-19-2020, 09:39 PM   #43
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I installed a pair of 'powerpole' PP30 jacks under the dinette near the power center, the inverter has a PP30 on its DC input cord... each PP30 is on its own 30A fuse.

If anyone does this just remember to wire to the lower two fuse positions on the WFCO power center 12V board. They are the only ones rated for 30A. The rest are rated for 20A max.
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Old 03-20-2020, 02:32 AM   #44
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Yup. Exactly. Each power pole is on a 18-20" long piece of marine 12/2, and wired to those exact fuses. The cigar plug has a 20a fuse, and both USB ports are on a 8A fuse.

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Old 03-20-2020, 07:00 AM   #45
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If anyone does this just remember to wire to the lower two fuse positions on the WFCO power center 12V board. They are the only ones rated for 30A. The rest are rated for 20A max.
Also bear in mind that if you have a 3-way fridge the 12V power is most likely wired to one of those two 30A slots already so you will only have one available.
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Old 03-20-2020, 09:41 AM   #46
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Also bear in mind that if you have a 3-way fridge the 12V power is most likely wired to one of those two 30A slots already so you will only have one available.
My Euro style big fridge has DC but is on fuse 1, 20A
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Old 03-20-2020, 11:48 AM   #47
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My Euro style big fridge has DC but is on fuse 1, 20A
Interesting. They must have changed things up. A 2019 21 that I worked on had a 30A fuse in the last slot for the fridge.
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Old 03-22-2020, 02:22 AM   #48
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How do you specify charging rates?
Current is measured in amps.
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Old 03-22-2020, 06:45 AM   #49
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All things electrical can be described by three units, volts, amps, and ohms.

Voltage is typically fixed by the power supply, 12v on our DC systems.

Ohms is the measurement of resistance or impedance, and also is generally fixed, by the nature of the load.

Amps is the current flowing through the load.

"Ohms Law" states that Volts = Amps * Ohms. Or, Amps = Volts / Ohms. Given any two known values, the third can be calculated.
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Old 03-22-2020, 07:04 AM   #50
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Someone described it like this: voltage is what flows through the pipe, ohms is the size of the pipe and amps is the pressure in the pipe? does this make sense to anyone?
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Old 03-22-2020, 07:13 AM   #51
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Someone described it like this: voltage is what flows through the pipe, ohms is the size of the pipe and amps is the pressure in the pipe? does this make sense to anyone?
Close - voltage would be the pressure in the pipe, current would be the flow in the pipe and the ohms would be the size/roughness (overall resistance) of the pipe
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Old 03-22-2020, 07:33 AM   #52
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Thanks, I knew it had something to do with watering the lawn.........
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Old 03-22-2020, 09:45 AM   #53
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Yes, ohms would represent the coefficient of friction (C value). The pressure loss of a system thru friction loss. I am an irrigation engineer as a part of being a landscape architect.

What does watts translate to, using this water metaphor?

Hey Jim,. earlier you mentioned that you are usually fully charged by noon with your solar system. I think.

Can you describe your system. One or two panels? 190 watts?

Thanks.


Incidentally, solar panels and portable power stations are also being purchased to the point of running out of stock right now.
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Old 03-22-2020, 10:08 AM   #54
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I have the stock, one panel, 190 watt and dual 6 volts batteries. Amp x volts=watts
watts is measure of power thus water turning a wheel, named after James Watt who improved the steam engine.
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Old 03-22-2020, 10:09 AM   #55
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I have the stock, one panel, 190 watt and dual 6 volts batteries.

Yeah, I'm over reacting.
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Old 03-22-2020, 01:11 PM   #56
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...
What does watts translate to, using this water metaphor?
...
To your water bill at the end of the month.
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Old 03-22-2020, 01:16 PM   #57
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V x A = W.


Okay that makes sense. It's describing the whole package. Volts and amps. It's describing power and volume with one variable.


I think I get it.
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Old 03-22-2020, 01:18 PM   #58
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the water analogy only goes so far. watts, being volts*amps, don't really correlate to water pressure * flow rate.
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Old 03-22-2020, 01:38 PM   #59
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the water analogy only goes so far. watts, being volts*amps, don't really correlate to water pressure * flow rate.
The river analogy is a vented system. Vented to atmosphere. But there is definitely pressure, like in an irrigation system

Calculate at .433 pounds per vertical feet which equals head (in a hydraulic gradient line), that builds up p.s.i. pretty fast. Would pressure equate to a power station?

I have always wondered about this analogy.
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Old 03-22-2020, 03:05 PM   #60
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What does watts translate to, using this water metaphor?.
Power needed to run the pump to move that flow ("current") of water at that pressure ("voltage"), or power from a hydraulic motor driven by that flow and pressure of fluid.

Well, you asked...

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the water analogy only goes so far. watts, being volts*amps, don't really correlate to water pressure * flow rate.
But it does. Most people don't use water for power so they only think of it in terms of volume, but in hydraulic power (whether the relatively incompressible fluid is water or oil), the product of pressure and flow rate really is power. If the pressure is pressure drop in a pipe, then the power is power dissipated due to flow restriction; if the pressure is supply pressure then the power is hydraulic power delivered to the system.

If you want to look at this on a fundamental level, consider water pushing a piston: the force on the piston is the product of the piston area and the water pressure, the volume displaced is the product of the piston area and the stroke, and the mechanical power delivered to the piston is the product of the force and piston speed, which is also the volume of water per unit time. There, now you understand hydraulic motors.
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