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DIY Mini "UPS" - need suggestions for alternative inverter/charger

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adobopr

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Oct 23, 2020
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I want to try and design an affordable UPS style system for friend/family that is able to charge from grid, provide deep discharge, and have enough power to turn on the fridge and maybe a few more things. For context I live in Puerto Rico and the grid here is super unstable, and while I have a good solar system at my disposal, not everyone can afford it or even install it where they live, and many places downright ban gas generators because of emissions and noise.

From my bit of research it seems that for maintaining a small size the best option is to stick to 12V systems, and I think a 12V 100AH LFP battery is probably good enough.

I found this Inverter with Charger and transfer switch built in on Amazon that I think is worth trying: https://www.amazon.com/dp/B0989XPZ48/

Pair this with any 12V 100AH that can handle 100A with some surge, a good quality 100A breaker and some 4AWG, plus the NEMA 5-15s, I feel like this is a decent UPS for ~$600.

What do you all suggest as alternatives for this system? I'm open to vastly different systems as long as cost stay relatively in the same ballpark, and if the value provided is higher than this.
 
adobopr said:
I want to try and design an affordable UPS style system for friend/family that is able to charge from grid, provide deep discharge, and have enough power to turn on the fridge and maybe a few more things. For context I live in Puerto Rico and the grid here is super unstable, and while I have a good solar system at my disposal, not everyone can afford it or even install it where they live, and many places downright ban gas generators because of emissions and noise.

From my bit of research it seems that for maintaining a small size the best option is to stick to 12V systems, and I think a 12V 100AH LFP battery is probably good enough.

I found this Inverter with Charger and transfer switch built in on Amazon that I think is worth trying: https://www.amazon.com/dp/B0989XPZ48/

Pair this with any 12V 100AH that can handle 100A with some surge, a good quality 100A breaker and some 4AWG, plus the NEMA 5-15s, I feel like this is a decent UPS for ~$600.

What do you all suggest as alternatives for this system? I'm open to vastly different systems as long as cost stay relatively in the same ballpark, and if the value provided is higher than this.
Click to expand...


How long neet it to run .
And wat have it to run (watts)
After that you can calculate the watts you have .

That 100Ah only have 1000watts for 1 hour to run ands its done. (1Kwh)
 
adobopr said:
I want to try and design an affordable UPS style system for friend/family that is able to charge from grid, provide deep discharge, and have enough power to turn on the fridge and maybe a few more things. For context I live in Puerto Rico and the grid here is super unstable, and while I have a good solar system at my disposal, not everyone can afford it or even install it where they live, and many places downright ban gas generators because of emissions and noise.

From my bit of research it seems that for maintaining a small size the best option is to stick to 12V systems, and I think a 12V 100AH LFP battery is probably good enough.

I found this Inverter with Charger and transfer switch built in on Amazon that I think is worth trying: https://www.amazon.com/dp/B0989XPZ48/

Pair this with any 12V 100AH that can handle 100A with some surge, a good quality 100A breaker and some 4AWG, plus the NEMA 5-15s, I feel like this is a decent UPS for ~$600.

What do you all suggest as alternatives for this system? I'm open to vastly different systems as long as cost stay relatively in the same ballpark, and if the value provided is higher than this.
Click to expand...
Just be aware while a fridge generally has low running watts it can surge quite a bit momentarily when the compressor kicks on.
 
Brucey said:
Just be aware while a fridge generally has low running watts it can surge quite a bit momentarily when the compressor kicks on.
Click to expand...
Correct.
I can see it on my systeem
Fridge run normal on 5amps .
But if it kick in the pump on that moment it go up to 60amps .
The victron pull that out if the battery on that moment (les than a sec)
Victron 12v 1200ve model
 
Suijkerbuijk said:
Correct.
I can see it on my systeem
Fridge run normal on 5amps .
But if it kick in the pump on that moment it go up to 60amps .
The victron pull that out if the battery on that moment (les than a sec)
Victron 12v 1200ve model
Click to expand...
Yes the Victron 1200s can handle it but I don't know about that 1000W one from ampenvt.
 
Brucey said:
Yes the Victron 1200s can handle it but I don't know about that 1000W one from ampenvt.
Click to expand...
Its more that the inverter in standby and than the fridge pull power that the inverter capacitor are drawn on that moment.
And that is the high amps on that moment.
The inverter will not have a problem with that but the bms can shutdown on that moment if thare are more stuff are connected on the battery like light , chargers for phone and more.

Normal a bms can do more for a short time.
Like my own bms can do 150a and for 10 sec max 600a.
Well my bms can do this .
The first time the inverter charge up the bms dit shutdow on that moment.
I have contact Victron about it and the first start of a inverter can pull a 1000amp on that moment for les than a sec .
To first charge the capacitor
 
Suijkerbuijk said:
How long neet it to run .
And wat have it to run (watts)
After that you can calculate the watts you have .

That 100Ah only have 1000watts for 1 hour to run ands its done. (1Kwh)
Click to expand...
Most likely just for a few hours. I think 1200Wh could give 8-10 hours on a fridge with a good inverter. Worst case adding a second 12V in parallel would be simple and cheap to double the capacity.
Brucey said:
Just be aware while a fridge generally has low running watts it can surge quite a bit momentarily when the compressor kicks on.
Click to expand...
Yes absolutely taking that into account. I used to run the fridge for my mom with a 1200W Pure Sine wave inverter and the surge would get to around 1800 for less than a second sometimes. That was with Lead Acid batteries though.
 
adobopr said:
Most likely just for a few hours. I think 1200Wh could give 8-10 hours on a fridge with a good inverter. Worst case adding a second 12V in parallel would be simple and cheap to double the capacity.

Yes absolutely taking that into account. I used to run the fridge for my mom with a 1200W Pure Sine wave inverter and the surge would get to around 1800 for less than a second sometimes. That was with Lead Acid batteries though.
Click to expand...

My 150ah lipo4 on my Victron inverter with a freezer that use 5amps.
I loose about in the night from 22:00 to 07:00 in the morning its about 15% max drawn from the battery.
So really i can run about 3.5 days with out charging .
I say about the phone chargers use the same battery.
So its about 15Ah i use on a night.
 
I'm definitely avoiding high tier components as I'm trying to keep the cost down. I already have my own house with an 18kPV with 30kWh of batt, and extra backup 7kWh with an lv2424 for the computer and network.

I want the people who use this that can use generators to be able to charge the batt and then not have to run their generatos 24/7, such as at night where the noise is awful, or the ones that can't use a gen be able to take the batt somewhere else to charge and get some power.
 
adobopr said:
I'm definitely avoiding high tier components as I'm trying to keep the cost down. I already have my own house with an 18kPV with 30kWh of batt, and extra backup 7kWh with an lv2424 for the computer and network.

I want the people who use this that can use generators to be able to charge the batt and then not have to run their generatos 24/7, such as at night where the noise is awful, or the ones that can't use a gen be able to take the batt somewhere else to charge and get some power.
Click to expand...
If Its only a fridge and some led lichtbals.

You can do a lot with a 100/150ah battery on lipo4.
With 200watts good solar panels and a mppt .
En a inverter (Victron 600watt wil do the job just fine for a fridge )
That fridge will run on battery and solar panel power for years (if you do not have a winter )
Its best en save way to do it .
Special if you do not have a generator.

I can not know the cash those people have to spend.
But this is how life day by day .

The problem with charge battery on somebody else charging points , you never know if that charge profile can be use for that battery .
And if the battery blow up well no fridge

My own setup have 250watt solar panel and on a good day i charge about 13ampe
On a bad day its about 2.5/3 amps
And my panels are flat on the boat and boat move in te water.
So a house it will do easy more.
 
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