Getting the best out of my system

[-TX-]

I think a few things have been lost along the way.

1) I have already properly crimped my 2awg battery cables with a crimper I own. However, they are not hydraulic so I have a hard time with thick walled connectors.
2) I thought the recommendation to use 2 hole connectors a good idea because my RV is mobile. 2 hole connectors are all think walled, as far as what I found.
3) So I need to crimp 9 thick walled connectors. Nine.
4) My biggest amperage draw is my fridge which peaks out at 10~ amps with active condenser. Otherwise it sits at a half amp.
5) My daily kW usage is around 8.

6) This is not a 200+ amp setup
7) Nor is it a 100+ amp setup
8) It's unlikely to be even a 50 amp setup (although I have high hopes for my bedroom AC which draws 3.7amps)

With all due respect, insisting on high amperage, high cost solutions to every project, no matter how small, can be counter-productive. Yes, safety is a grave concern, but if you really believe that 50 peak amps traveling through 2awg cable to a crimp shown in that video for maybe 15 peak minutes, is a serious safety concern, I'll say you're being a bit hyperbolic. A bit.

As always, I appreciate this board's thoughts even if not all of them are followed.

[Sunking]

Ithink a few things have been lost along the way.

1) I have already properly crimped my 2awg battery cables with a crimper I own. However, they are not hydraulic so I have a hard time with thick walled connectors.
2) I thought the recommendation to use 2 hole connectors a good idea because my RV is mobile. 2 hole connectors are all think walled, as far as what I found.

No sir.You must of used really low quality Ring Connectors because the walls are the exact same.

4) My biggest amperage draw is my fridge which peaks out at 10~ amps with active condenser. Otherwise it sits at a half amp.
5) My daily kW usage is around 8.

OK this is complete nonsense. If you are drawing 1/2 amp for 24 hours around the clock at 12 volts is 144 watt hours, or 288 wat hours if 24 volts. No way does that add up to 8000 watt hours. You are way off the mark and I know why.

6) This is not a 200+ amp setup
7) Nor is it a 100+ amp setup
8) It's unlikely to be even a 50 amp setup (although I have high hopes for my bedroom AC which draws 3.7amps)

More complete nonsense. At 12 volts with 3.7 amps is only 45 watts. There is no Air Conditioner on the face of the earth that only uses 45 watts. I know what you have done and is really messing you up. You are confusing amps at 120 volts AC, not low voltage DC. 3.7 amps at 120 VAC is 450 watts which is about right for a 1/2 Ton Window shaker Air Conditioner. On the low voltage DC side once you take the inverter efficiency into account is drawing 47 amps just to run the Window Shaker. your 50 amp theory just flew out the window with the fire coming your way.

That 10 amps peak you see on the Fridge is at 120 VAC and that translate into 125 amps DC from the battery at 12 volts. What you call 1/2 amp while running is again at 120 VAC, not 12 volt DC. At DC is 6 amps.

Watts = Amps x Volts.
Amps = Watts / Volts
Volts = Watts / Amp

Do the math my friend.

1 amp x 12 volts = 12 watts
1 amp x 120 volts = 120 watts.
10 amps x 12 volts = 120 watts



But hold the bus because that is not the end of the story. You are making 120 VAC through your Inverter which is not 100% efficient. Try more like 80% efficient, so for every 100 watts you draw at 120 volts, take 120 watts on the DC side. So it takes 12 amps at 12 volts to equal 1 amp at 120 VAC. Dude you have every bit of a 200 amp DC system. You ignorance and denial is going to get you hurt.

1 amp @ 120 VAC = 11 to 12 amps @ 12 VDC.

The 12 VDC current is 11 to 12 times more than 120 VAC

[-TX-]

No sir.You must of used really low quality Ring Connectors because the walls are the exact same.

You, sir, are incorrect. The difference in wall thickness between these and these is night and day. I know, I've crimped them both.

OK this is complete nonsense. If you are drawing 1/2 amp for 24 hours around the clock at 12 volts is 144 watt hours, or 288 wat hours if 24 volts. No way does that add up to 8000 watt hours. You are way off the mark and I know why.

My fridge is AC and at this precise moment I am drawing .85 amps. Subtract all other appliances plugged in but not active, except some clocks, and call it .5 amps

More complete nonsense. At 12 volts with 3.7 amps is only 45 watts. There is no Air Conditioner on the face of the earth that only uses 45 watts. I know what you have done and is really messing you up. You are confusing amps at 120 volts AC, not low voltage DC. 3.7 amps at 120 VAC is 450 watts which is about right for a 1/2 Ton Window shaker Air Conditioner. On the low voltage DC side once you take the inverter efficiency into account is drawing 47 amps just to run the Window Shaker. your 50 amp theory just flew out the window with the fire coming your way.

My AC obviously runs off AC and I saw that 3.7amps with my own eyes.. Is there even such thing as a DC powered AC?

That 10 amps peak you see on the Fridge is at 120 VAC and that translate into 125 amps DC from the battery at 12 volts. What you call 1/2 amp while running is again at 120 VAC, not 12 volt DC. At DC is 6 amps.

Watts = Amps x Volts.
Amps = Watts / Volts
Volts = Watts / Amp

Do the math my friend.

1 amp x 12 volts = 12 watts
1 amp x 120 volts = 120 watts.
10 amps x 12 volts = 120 watts



But hold the bus because that is not the end of the story. You are making 120 VAC through your Inverter which is not 100% efficient. Try more like 80% efficient, so for every 100 watts you draw at 120 volts, take 120 watts on the DC side. So it takes 12 amps at 12 volts to equal 1 amp at 120 VAC. Dude you have every bit of a 200 amp DC system. You ignorance and denial is going to get you hurt.

1 amp @ 120 VAC = 11 to 12 amps @ 12 VDC.

The 12 VDC current is 11 to 12 times more than 120 VAC

Inverter is rated at 88% efficiency and my DC system usage is 3amps over 10 days.

[-TX-]

Thanks, mods.

[Mike90250]

......
My fridge is AC and at this precise moment I am drawing .85 amps. Subtract all other appliances plugged in but not active, except some clocks, and call it .5 amps

My AC obviously runs off AC and I saw that 3.7amps with my own eyes.. Is there even such thing as a DC powered AC?

Inverter is rated at 88% efficiency and my DC system usage is 3amps over 10 days.

Wow. I'm not sure how to start, But there is a huge disconnect here,
DC air conditioners might exist somewhere, but the power they consume is prohibitive at low voltages
AC:
3.7A @ 120VAC = 444 w x 1.12 (which is your 88% eff for inverter) = 497.28 watts total DC load the inverter pulls from battery
The DC half:
497.28w / 12.5V = 39.7824 amps DC from the battery.

[Sunking]

You, sir, are incorrect.

Those are not the same. A 2 AWG Wire uses the exact same dies. They are color coded.

My fridge is AC and at this precise moment I am drawing .85 amps. Subtract all other appliances plugged in but not active, except some clocks, and call it .5 amps

My AC obviously runs off AC and I saw that 3.7amps with my own eyes.. Is there even such thing as a DC powered AC?

Inverter is rated at 88% efficiency and my DC system usage is 3amps over 10 days.

Dude pull your head out of your ass. You are looking at AC amps, not DC amps.

Do the fricking math.

Watt = Voltage x Amps.

1 amp x 12 volts does not equal 1 amp x 120 volts. 12 does not equal 120

120 watts = 12 volts x 10 amp
120 watts 120 volts x 1 amp

You are looking at the AC amps out of the Inverter. The current from the battery is 11 to 12 times more. If your Inverter is 88% efficient means for every 100 watts of load at AC pulls 113.6 watts.

So if you Window Shaker Air Conditioning pulls 3.7 amps @ 120 VAC (444 watts) means it is pulling 42 amps on the battery. Do the damn math. 444 watts / .88 = 504 watts
504 watts / 12 volts = 42 amps.

Everything you are saying is nonsense. How in the hell do you come up with 8000 watt hours a day on only 3 amps @ 12 volts or even 120 volts?

3 amps x 12 volts = 36 watts.

36 watts x 24 hours = 864 watt hours.

You do not understand the math and is really messing you up. .

[-TX-]

Wow. I'm not sure how to start, But there is a huge disconnect here,
DC air conditioners might exist somewhere, but the power they consume is prohibitive at low voltages
AC:
3.7A @ 120VAC = 444 w x 1.12 (which is your 88% eff for inverter) = 497.28 watts total DC load the inverter pulls from battery
The DC half:
497.28w / 12.5V = 39.7824 amps DC from the battery.

497.28w / 25V = 19.8912 amps DC from the battery

Thank you

[littleharbor]

Seems like a waste of time trying to help when the person you are trying to help wont listen and continually doubts and debates your answers.

[Sunking]

AC:
3.7A @ 120VAC = 444 w x 1.12 (which is your 88% eff for inverter) = 497.28 watts total DC load the inverter pulls from battery
The DC half:
497.28w / 12.5V = 39.7824 amps DC from the battery.

Mike I am splitting hairs with you but 444 watts with 88% efficiency should be 540 watts right? Or 444 / .88 = 504.

If you want to multiply you have to invert 88% or 1/.88 = 1.1363. That gets you to 444 watts x 1.1363 = 540 watts.

[-TX-]

Those are not the same. A 2 AWG Wire uses the exact same dies. They are color coded.





Dude pull your head out of your ass. You are looking at AC amps, not DC amps.

Do the fricking math.

Watt = Voltage x Amps.

1 amp x 12 volts does not equal 1 amp x 120 volts. 12 does not equal 120

120 watts = 12 volts x 10 amp
120 watts 120 volts x 1 amp

You are looking at the AC amps out of the Inverter. The current from the battery is 11 to 12 times more. If your Inverter is 88% efficient means for every 100 watts of load at AC pulls 113.6 watts.

So if you Window Shaker Air Conditioning pulls 3.7 amps @ 120 VAC (444 watts) means it is pulling 42 amps on the battery. Do the damn math. 444 watts / .88 = 504 watts
504 watts / 12 volts = 42 amps.

Everything you are saying is nonsense. How in the hell do you come up with 8000 watt hours a day on only 3 amps @ 12 volts or even 120 volts?

3 amps x 12 volts = 36 watts.

36 watts x 24 hours = 864 watt hours.

You do not understand the math and is really messing you up. .

Well aware of the math, although I can't be as precise as Mike was because, like, he also included inverter inefficiency.

3.8a AC draws 18.20a on my 24v bank. Subtract from that inverter inefficiency and other small variables.

[Sunking]

Well aware of the math, although I can't be as precise as Mike was because, like, he also included inverter inefficiency.

I did include effiecency, you just did not want to hear it.

3.8a AC draws 18.20a on my 24v bank. Subtract from that inverter inefficiency and other small variables. [/QUOTE]

Try again, 21.6 amps.

[-TX-]

18.2.... 21.6... 17.2 if I use 115ac and 25dc

it's all kinda the same.

[Mike90250]

Mike I am splitting hairs with you but 444 watts with 88% efficiency should be 540 watts right? Or 444 / .88 = 504.

If you want to multiply you have to invert 88% or 1/.88 = 1.1363. That gets you to 444 watts x 1.1363 = 540 watts.

Hmmm.. maths is not my strongest suit, I've done % by subtracting from 100
100 - 88 = 12 and using that with a dec place to be a multiplier Not sure how/where I learned it vs 1/.88 But the result came close to yours, and seemed reasonable to me other times I've used that method.

[Sunking]

OK Mike does 444/497.28 = .88?

Or does 444/504.5454.. = .88?

Did you come up with 444/497.28 = .892?

Let's do an easy one you can do on one hand with two fingers. Inverter efficiency is 50% with a 1 watt output. What is the input?

2 watts right? With your method would have gave you 1.5 watts which is 66.67% efficient.

[Mike90250]

OK Mike does 444/497.28 = .88?
Or does 444/504.5454.. = .88?
Did you come up with 444/497.28 = .892?
Let's do an easy one you can do on one hand with two fingers. Inverter efficiency is 50% with a 1 watt output. What is the input?
2 watts right? With your method would have gave you 1.5 watts which is 66.67% efficient.

yeah, I'm seeing a problem. I've been getting "close enough" but not dead on. Too many years relying on spreadsheets, mathworks and canned formulas