Load Shedding solution for PC 800w + 3x Monitors

[JustKingAlex]

Hi guys,

TLDR: Need advice on what Inverter + how many and what batteries to buy to power 800w PC + 3x Monitors.

With my new job I need to make sure I have access to my pc 24/7 as it has work related software that I use. I have a 800w pc (not sure how much it uses but lets just assume it uses the maximum 800w) that I need to make sure stays powered on for longer than 2:30 hours.

I was told to look at inverters - specifically a pure sine wave inverter. Not too clued up on inverters and I am doing research on it but I thought I would see if any fellow members have any advice or solutions I could use.


---------------------
PC Specs
- RX 580
- B450M
- Ryzen 5 3600x
- Asus Wifi Card
- 4 x RGB Fans
---------------------
3x Samsung C24RG50FQU 24" Full HD 144Hz FreeSync Curved Gaming Monitor (I need all three to be on for my work)

 

[dotnerd]

The information you supply is completely useless.

Put this inbetween your plug and see what it reads. Use this value to calculate what you need to run for X amount of time.

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Handy tip:

Dont cheap out, do it properly.

 

[solz]

i would say taht your pc wouldnt really see the full 800w being used

but planning for say 800watt
would depend on what inverter you end up going for (12v/24v or 48v)
so 12v - would be 800/12=66.67amp
and 24v - would be 800/24=33.33amp
48v - 800/48=16.67amps

so with 48v inverter for 3h you would look at something like 120amp/130amp battery so that battery doesnt get depleted below 50% for the 3hr runtime - didnt calculate monitors as they should be very low power users(didnt check)

 

[PsyWulf]

Battery size calculator

The battery size calculator calculates the battery size in ampere-hour (Ah).

www.jcalc.net

800watts,12v batteries (Lead cheapies) 50% DOD
= 606AH for 3 hours

48v batteries (Lead cheapies) 50% DOD
= 152 AH for 3 hours

48v batteries (Lithium Walletkillers) 80% DOD
= 63 AH for 3 hours

Get a plug to measure properly though,it'll save you loads on batteries if you DONT use 800watts flatlined

 

[Esea]

Wouldn't a Laptop for when the power is out be better ?

 

[PsyWulf]

So for comparison - my home office,with 4 screens,1 router,1 switch,1 ONT,2x microservers,1x Pi and gaming laptop (Rtx2070) hit 400watts during last load shedding

Sent from my F1 using Tapatalk

 

[Sola Scriptura]

try and get a watt meter and measure the draw from te wall while you run some stress tests on the cpu and gpu.

 

[spydr97]

My UPS setup runs both machines in my sig, my AC server mini PC, two routers, and switch. According to the on-screen display it's only using about 300-350W under normal usage conditions. When gaming on my main machine that spikes to about 550W (this is including the 4 monitors)

I can get 3 hours comfortably on a 3000W pure sine wave inverter/UPS with a single 12V 200Ah battery provided its normal use. I did have an MSFS2020 flight on autopilot during load-shedding one evening (this maxes out my GPU @120% power draw and uses about 50% of my CPU) and my machine didn't switch off so I assume that it's sufficient to run 2.5 hours on maximum PC load but I can't tell you what the battery voltage was or how close it came to dying.

I built my folks a 2000W 24V system for their stuff with 2 100Ah deep cycle batteries and that also runs pretty well. For your usage a 24V system would probably be a better option - 48V might be overkill.

Also, try and get a UPS as opposed to an inverter (not the crappy Mercer ones but a proper pure sine wave one). They look exactly like the normal inverters but have a built-in battery charger and there's no down time as opposed to having to manually change over and restart your machine when Eishkom hits.

 

[Off-The-Chart]

Also, try and get a UPS as opposed to an inverter (not the crappy Mercer ones but a proper pure sine wave one). They look exactly like the normal inverters but have a built-in battery charger and there's no down time as opposed to having to manually change over and restart your machine when Eishkom hits.

think you have that switched around

you should get an inverter, not a UPS

 

[spydr97]

think you have that switched around

you should get an inverter, not a UPS

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This is the exact one that I have and it says UPS inverter (the label on the top reads Uninterruptable Power Source 🤷‍♂️) and does the changeover automatically. The standard inverters from the same manufacturer don't have the AC in or battery charger

 

[Off-The-Chart]

this would be a kit I would recommend to someone 1) for the portability and 2) the inverter can be hard wired into the db later on if so wanted

3000VA Mecer Axpert Pure Sine Inverter + 2x 100Ah Battery Trolley (8 HOUR BATTERY LIFE) KIT - 3000W (150-200 cycles) - GeeWiz

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