Router Battery Backup

chrisc said:
Don't load an inverter more than 60% of the advertised load
Many of the specs are inflated
Friend bought a 1200 VA inverter. At 800 watts it got hot and tripped out
Click to expand...

1200VA doesn't necessarily mean 1200W, it depends on the power factor, there are other factors also like induction/resistive loads.
 
chrisc said:
Lithium-ion is the way to go

You can get 3.7V cells from LED Select on Bid or Buy and make up a pack yourself
Click to expand...
How much do you think will it cost to get a 100ah lithium ion battery.
 
Steamy Tom said:
say 300Wh, it might help to break it down but if you wanted a one fit solution you need an inverter and battery(ies), a 300/500W inverter would do just fine and then enough backup to last the duration, a single 100Ah on a 12V system would be fine. (you might struggle to get a cheap pure sine wave inverter at a good price though).

might be worth upsizing to a mecer 1200W bundle
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What battery(s) is inside the 1200watt mecer ups? (assuming you are talking about UPSs)
 
Here are some observations about two 12 volt backup systems (CCTV, Alarm etc.) that I have modified to give a second 5 volt output, a battery isolation switch and a voltmeter across the battery (after the isolation switch).

The first is the PeakPower PSU CCTV 12VDC 3A which I bought at Communica about 3 years ago. The two pictures show the PSU in operation and the modifications I have made - the 5v buck converter is a very small 5v 3A module bought at Botshop. This module had been placed underneath the output connector strip and powers a cheap TPLink wi-fi modem used in a ethernet bridge to wi-fi mode. The main 12v supply powers a Hikvision with 4 cameras. The IOT wi-Fi network is completely separate from my main network. This has been used as a CCTV backup for the last 3 years using a GEL lead acid battery. It is an old-school design with a single PCB. no MCU that I could see, and runs fairly cool. I am now using the new Sherlotronics PSU for the CCTV system.

The second is the Sherlotronics 12v 3A2 unit which I bought at Security Superstore in Elardus Park for R480. It uses a separate 14 volt PSU and a second small PIC controlled module. As it runs a lot hotter than the Peak Power I have added some round cooling holes at the top. The three pictures show the placement of the 5v module, the voltmeter and the battery isolation switch. I have only been using it for a few weeks and I am still investigating it. It has a trimpot on the 14v module which I adjusted slightly higher.

Peakpower Unit: https://www.communica.co.za/products/psu-cctv-12vdc-3a

Sherlotronic: http://www.sherlotronics.co.za/power-supply-12vdc-3-2a/

www.securitysuperstore.co.za

Sherlo 3.2A Power Supply Charger Unit 12VDC

FEATURES: Microprocessor Controlled charging output. Low battery switch off at 10V DC. Buzzer tones on battery low and AC Fail. Resettable Fuse protection on output. Fuse protection on AC input. ABS Plastic enclosure. Fits 12V 7AH Sealed Lead Acid Battery APPLICATIONS: Alarm panel Battery backup...
www.securitysuperstore.co.za www.securitysuperstore.co.za

Botshop: https://www.botshop.co.za/product/adjustable-3a-ultra-small-dc-power-module/

Voltmeter: https://www.robotics.org.za/V2430B?search=voltmeter
 

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Thor said:
How much do you think will it cost to get a 100ah lithium ion battery.
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over 20k and you would need a 48V inverter... (there are some 24v varieties) - also you wouldnt need as big a capacity battery with Lithium ion as with LA
 
Thor said:
What battery(s) is inside the 1200watt mecer ups? (assuming you are talking about UPSs)
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www.geewiz.co.za

1200VA Mecer Inverter + 100AH Battery (4 HOUR BATTERY LIFE) KIT - 720W (150-200 cycles) - 12 Month Warranty

Mecer Inverter 1200VA (720W) + 20A Charger SIMILAR to INTELLIPOWER 2 or TESCOM 1000VA UNIT Includes 1x 100Ah Battery + Battery Case All cabling included 12-month warranty on the inverter PLEASE NOTE: The 4-hour battery life is based on a 150W consumption. Typically, a TV, lamp, wifi router, and...
www.geewiz.co.za www.geewiz.co.za

it will be a generic sort of leisure battery, lead acid
 
Steamy Tom said:
over 20k and you would need a 48V inverter... (there are some 24v varieties) - also you wouldnt need as big a capacity battery with Lithium ion as with LA
Click to expand...
Wait so with Lithium ion 1Ah does not equal 1Ah from a lead acid?

How does that work?
 
Thor said:
Wait so with Lithium ion 1Ah does not equal 1Ah from a lead acid?

How does that work?
Click to expand...
Lead acid dod (depth of discharge) is only around 50% while lithium iron (yes, iron for these larger batteries - LiFePo4) can do 80-90%.
 
Thor said:
Wait so with Lithium ion 1Ah does not equal 1Ah from a lead acid?

How does that work?
Click to expand...

LiFePhosphate battery 108Ah 12v about R10k
If you look at 2b.jpg I posted above you can see I used a LiFePO4 battery 12v 8Ah not a leadacid

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www.communica.co.za

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www.communica.co.za www.communica.co.za
 

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Thor said:
Wait so with Lithium ion 1Ah does not equal 1Ah from a lead acid?

How does that work?
Click to expand...

no, what i meant is that you can discharge the Lithium ion more than the LA, thus meaning its usable capacity is more for the same size, sorry for the bad explanation. i.e you wouldn't discharge a LA more than 50%, imo you want to actually only discharge it say 20/30%, whereas Lithium you can go 80-100%
 
Steamy Tom said:
no, what i meant is that you can discharge the Lithium ion more than the LA, thus meaning its usable capacity is more for the same size, sorry for the bad explanation. i.e you wouldn't discharge a LA more than 50%, imo you want to actually only discharge it say 20/30%, whereas Lithium you can go 80-100%
Click to expand...
Aha.
I have new stats now, seems my routers/pi and TV plus soundbar pulls 100watt and then my PC + two screens also pull 100 watt (make it 130 for peak).

So 230 watt usage.

What size lithium-ion/iron battery would I require to run this for 2 hours and 30 minutes x 2 per day (assuming stage 4 becomes the norm)

How do I work out the Ah needed?

What invertor can I use for this (i'd like it to be always online if that makes sense?)

Like wall to invertor plus batteries, power drops, batteries take over.

993ff97f-74c1-4b92-afb5-53a13a02cb00.jpg
 
Thor said:
Aha.
I have new stats now, seems my routers/pi and TV plus soundbar pulls 100watt and then my PC + two screens also pull 100 watt (make it 130 for peak).

So 230 watt usage.

What size lithium-ion/iron battery would I require to run this for 2 hours and 30 minutes x 2 per day (assuming stage 4 becomes the norm)

How do I work out the Ah needed?

What invertor can I use for this (i'd like it to be always online if that makes sense?)

Like wall to invertor plus batteries, power drops, batteries take over.

View attachment 778194
Click to expand...
W = V x A

230w x 2.5 hours = 575Wh
575Wh / 12V = 48Ah
Assuming 80% DOD you'd need 60Ah battery.
 
Steamy Tom said:
This.

What is your budget firstly, and would you like to expand it later?
Click to expand...
I'm thinking battery technology will get better so let's go for the cheapest battery setup which I can replace regularly until the new tech is here - otherwise, I go buy a R10k Lithium battery charge it wrong and boom 10K down the drain.

Question: How many units does it take to recharge such a setup (I assume it will cost more than what is being uses up - power loss factor and all that.)
 
Thor said:
I'm thinking battery technology will get better so let's go for the cheapest battery setup which I can replace regularly until the new tech is here - otherwise, I go buy a R10k Lithium battery charge it wrong and boom 10K down the drain.

Question: How many units does it take to recharge such a setup (I assume it will cost more than what is being uses up - power loss factor and all that.)
Click to expand...

Cater for about 20% losses, so 1.2 units to cater for 1 unit used.

In terms of expanding etc it is a lot more complex than just the battery, like you could go for a 3kw/5kw inverter with a built in mppt solar charge controller for example. Buying the right battery could mean replacing it in 10+ years also.

I will take a look on a PC tomorrow at what options are available on smaller systems.

Do you have any sort of budget it mind?
 
Steamy Tom said:
Cater for about 20% losses, so 1.2 units to cater for 1 unit used.

In terms of expanding etc it is a lot more complex than just the battery, like you could go for a 3kw/5kw inverter with a built in mppt solar charge controller for example. Buying the right battery could mean replacing it in 10+ years also.

I will take a look on a PC tomorrow at what options are available on smaller systems.

Do you have any sort of budget it mind?
Click to expand...
Option 1:
Power just the routers plus TV (100 watts)

Option 2:
Power everything (230 watts)

Budget R5k? (can probably go higher, just feels like a lot of money to have internet for 2 hours a day)
 
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