UPS recommendation for the following wattage of usage.

[Suspect99]

I need 7ah for the network corner


The TV is about 16ah

That's a couple of Vape batteries and a buck converter with a bridge rectifier.

The size is definitely possible.

You need take the voltage that the aH is listed in as well. SLA batteries are 12V @ 7 Ah = 84Wh for example (halve that for useable capacity) . 18650s are 2.1Ah or 4.2 aH at 3.7V between 8 and 16 Wh.

 

[quovadis]

Lithium-ion ? For real?

Because then it would simplify a lot, If I just buy this inverter and then build my own battery pack like I wanted to do in that other thread using 18650 cells.

Should perhaps use a more appropriate subject like "how to hack together an inverter recommendation" ?

 

[isie]

Those are too bulky, simply not an option.


The UPS must be out of sight in the cupboard or drawer.

I think the answer is building this myself, doesn't seem there's a product on the market for this.
View attachment 1013482

lol that Youtube guy had a video where he put together a Back up kit for his mom

 

[Lupus]

After reading entire thread I would second the 720 Mercer option and buy LI batteries as you need. UPS consumes 2 much power just for itself and charging a 35+ AH battery will take you forever on a UPS. For example my Mercer takes 9 hours to put 100AH back into the battery and is waaay beefier than a simple UPS.

As for worried about noise next to TV. I have one of the new Mercer 1440 + 2 x 105AH 12V batteries that supply 382W for 4.5 hours right next to mine and we have no complaints:
View attachment 1014226

Wouldn't that only be 280w for 4.5 hours? Cause I've got that setup for many years, not as neat as yours though.

 

[AlphaJohn]

Wouldn't that only be 280w for 4.5 hours? Cause I've got that setup for many years, not as neat as yours though.

Guess it varies... I know the peak I saw was 382W... Mostly playing games and not gonna watch the Kill-a-watt for 4 hours while I'm busy killing "people"

Kinda like this:


Interesting sidenote... old games seem to use waaay less power, imagen that.

 

[Suspect99]

You need take the voltage that the aH is listed in as well. SLA batteries are 12V @ 7 Ah = 84Wh for example (halve that for useable capacity) . 18650s are 2.1Ah or 4.2 aH at 3.7V between 8 and 16 Wh.

9.62Wh for a 18650

 

[AlphaJohn]

Lithium-ion ? For real?

Because then it would simplify a lot, If I just buy this inverter and then build my own battery pack like I wanted to do in that other thread using 18650 cells.

I don't understand the 18650 craze...

The amount of work & expense to build a pack only make sense if you like get 1000's of them for free and have no insurance. Cause the moment the fireman finds that in your burnt down house insurance is null and void.

Cause charge controllers, proper racks and such can quickly negate the saving and lest not talk about the hours testing every cell to run matched groups.

Naa I'll just buy a sealed and be sorted.

 

[Mr Scratch]

I don't understand the 18650 craze...

The amount of work & expense to build a pack only make sense if you like get 1000's of them for free and have no insurance. Cause the moment the fireman finds that in your burnt down house insurance is null and void.

Cause charge controllers, proper racks and such can quickly negate the saving and lest not talk about the hours testing every cell to run matched groups.

Naa I'll just buy a sealed and be sorted.

John is smart
John understands risk management
Be like John

 

[Pineapple Smurf]

I only buy APC UPS's and have never had any buzzing of any sorts ever.
First thing I do when i buy one is I open it and toss the batteries out, put extension lead on it to bigger batteries as per affordability and what I am going to run.
I then put a generous blob of prestik over the piezo tweeter aka buzzer and this will take the sound down about 80% or more. I do not want to kill the buzzer totally as the buzzer is also a protection tool to let you know if there is a fault of somesorts. My UPS thats modded in the spare room is inside a cupboard and you cannot hear a single thing outside. The one I had in the lounge was as quieter than a conversation, more like a whisper and never bothered me ever.ut now I run Inverter and it is totally quiet.

When loadshedding kicks in I can hear a faint hum of the fans, much like a computer. It is very soft.

 

[Pineapple Smurf]

I don't understand the 18650 craze...

The amount of work & expense to build a pack only make sense if you like get 1000's of them for free and have no insurance. Cause the moment the fireman finds that in your burnt down house insurance is null and void.

Cause charge controllers, proper racks and such can quickly negate the saving and lest not talk about the hours testing every cell to run matched groups.

Naa I'll just buy a sealed and be sorted.

Agree, and although you can pack them in series and parallel and in series/parallel you have to balance each cell as well. Failure to balance them will result in the pack not charging 100%

 

[Thor]

 

[wingnut771]

View attachment 1016029

VAT?

 

[Thor]

I disagree, been using these for eons during projects.

The batteries, quality Samsung ones are R70 one

I have the welding machine and I have many of the mounting bits and metal strips, it really costs nothing to create a pack and BMSes are dirt cheap.

Much cheaper tbh to go this route (especially taking space into account, sure 5 truck batteries will do the job, but where will you put them?)

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Building battery packs are really easy and quick.

I don't understand the 18650 craze...

The amount of work & expense to build a pack only make sense if you like get 1000's of them for free and have no insurance. Cause the moment the fireman finds that in your burnt down house insurance is null and void.

Cause charge controllers, proper racks and such can quickly negate the saving and lest not talk about the hours testing every cell to run matched groups.

Naa I'll just buy a sealed and be sorted.

 

[wingnut771]

I disagree, been using these for eons during projects.

The batteries, quality Samsung ones are R70 one

I have the welding machine and I have many of the mounting bits and metal strips, it really costs nothing to create a pack and BMSes are dirt cheap.

Much cheaper tbh to go this route (especially taking space into account, sure 5 truck batteries will do the job, but where will you put them?)

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Building battery packs are really easy and quick.

You forgot the most important link, the batteries. How many samsungs to make 40Ah? Isn't it 60? 70x60 = R4200.

 

[Suspect99]

I disagree, been using these for eons during projects.

The batteries, quality Samsung ones are R70 one

I have the welding machine and I have many of the mounting bits and metal strips, it really costs nothing to create a pack and BMSes are dirt cheap.

Much cheaper tbh to go this route (especially taking space into account, sure 5 truck batteries will do the job, but where will you put them?)


Building battery packs are really easy and quick.

1 truck battery is 100ah@12V. Thats 1200Wh. One 18650 is approximately 10Wh. You'd need 120 18650's to make up the capacity of a truck battery.
Not taking lead acid vs lithium DOD into account

 

[Messugga]

1 truck battery is 100ah@12V. Thats 1200Wh. One 18650 is approximately 10Wh. You'd need 120 18650's to make up the capacity of a truck battery.
Not taking lead acid vs lithium DOD into account

To be fair, not all of that 100Ah is usable, if you want the battery to have any sort of lifespan.

 

[Suspect99]

To be fair, not all of that 100Ah is usable, if you want the battery to have any sort of lifespan.

Yeah thats why I said not taking DOD into account. But even at 50% DOD you'd need 60 18650s to make up the useable capacity of one truck battery

 

[Messugga]

Yeah thats why I said not taking DOD into account. But even at 50% DOD you'd need 60 18650s to make up the useable capacity of one truck battery

Apologies. I'm an idiot and didn't read the last line.

 

[Suspect99]

Apologies. I'm an idiot and didn't read the last line.

No worries

 

[Thor]

I am taking DoD and Energy density into account, that's the point.

I'm not necessarily looking for the cheapest price per watt.