12V to 24V battery backup (1 Viewer)

[Globe182jp]

Hey everyone. I’ve got a technical question for anyone who knows some about electronics.

I am building a battery backup for my IM Nuvo with a Mighty jet. Its a 24V so I will need to use a Step Up converter or two 12V batteries is series.

I want to use one larger lithium battery with a Converter to make like easier and cheaper( larger battery, much cheaper lithium 12v Charger compared to a 24V)

I found Converters and they list Amps and watts and I have no idea how to size them for something like my situation. Pump is about 22w max prob run about 10w and the battery is a 12V LiFePO4 between 18-50Ah largest I can get

Wondering if the Amps on the converters is a limit to the battery size in AH? I know I won’t hit the max Ws but not sure what the A rating is referring to.

Thanks Jake

 

[foos]

VxA=W
You do not fuse for V or W so they list A. 15A at 12V would be 180W.
AH is Amp Hours, a 12V 100AH battery would run 1A for 100H, or 2A for 50H, and so forth. 12V 2A is 24W, so it would run 24W for 50 hours. Less than that in reality due to losses though.

 

[Globe182jp]

Thanks for the reply so assuming the pump draws max 24W it would be a 2A draw. If I ran it at 10W it would be about 1A draw so the converter with a 5A max would work?

Someone else recommended just going with the 10A or 15A as they would run cooler and maybe more efficiently. Any idea if that would be true ?

Thanks for all the help
Jake

 

[foos]

Yes, the 5A should work then. Electronics tend to have peak efficiency near the middle of their range but the difference is not that great. One benefit of a larger one would be longer life if it is not high quality since lower quality ones would not have much head room at max power and would burn up. That would only be an issue if you wanted to run it at 100% at all times though.

A smaller one may feel hotter if it is physically smaller as well as how many amps it can handle. If it is 90% efficient and you run a 10W pump on it, you would be pulling 11W from the battery. That extra Watt would be released as heat and the smaller the heat sink the hotter it will feel.

 

[soymilk]

i would recommend something like this instead

EcoFlow RIVER 2 Portable Power Station 256Wh Generator LFP Certified Refurbished | eBay

EcoFlow RIVER 2---Power. Never Been This Easy. Q1:How long can the RIVER 2 power my appliances?. X-Boost can run devices that require up to 600W. However, it's best to test before use. 80%+ capacity after 3000 cycles.

www.ebay.com

the price have come down on them alot. after factoring the battery and the enclosure, you're going to be around the same price. this one is on sale with the coupon code for 114.

 

[Globe182jp]

That seems cool for AC power items, but just like a computer USP it’s going lose a ton of battery converting DC to AV to run the pump. Plus adding the Tunze Safety ($60) makes it way more expensive.

I ordered the parts and I’ll post the build when it all get here. Basically going use a Ecotech Battery backup to run a IM Mighty Jet with not no real permanent modification the any of the components.

If it all work I’ll build a much larger and cheaper version( cheaper battery setup) for my new tank using Simplicity 1000 pumps.

 

[soymilk]

portable back up batteries / solar generators don't have the same conversion lost as computer UPS. they also have built in regulated DC via cigarette plug.

Keep in mind the ecotech battery backup is only 216wh.

 

[Globe182jp]

I did not know maybe I’ll have to take a second look, I assumed they were more like a computer UPS. Have to price compare a larger one with a bigger battery. Bigger tank I would like to use a 12v 100ah LiFePO4, so maybe they have something in that size.

Need to price both systems out and see how they compare.

I already have the Ecotech backup less than a year old so I don’t wanna ditch it or mod it too much incase I do decide to sell it off. Wanna make a pretty much plug in play.

The Ecotech has a 18ah SLA battery so I’m assuming that the 216wh. Low power back up mode on a mp10 prob uses 8W and last about 70 hours.

So for this or the larger tank if I used a 100ah LiFePO4 that would be about 1188wh or about 380 hours at 8W, 190 hours at 16w and so on. More back up hours than I hopefully will ever need.

Jake

 

[Cody]

Hey everyone. I’ve got a technical question for anyone who knows some about electronics.

I am building a battery backup for my IM Nuvo with a Mighty jet. Its a 24V so I will need to use a Step Up converter or two 12V batteries is series.

I want to use one larger lithium battery with a Converter to make like easier and cheaper( larger battery, much cheaper lithium 12v Charger compared to a 24V)

I found Converters and they list Amps and watts and I have no idea how to size them for something like my situation. Pump is about 22w max prob run about 10w and the battery is a 12V LiFePO4 between 18-50Ah largest I can get

Wondering if the Amps on the converters is a limit to the battery size in AH? I know I won’t hit the max Ws but not sure what the A rating is referring to.

Thanks Jake

I know this doesn't help for DIY, but have you seen these? I use a couple of them and they work very well. You can essentially BYOB (bring your own battery).

The REEFBOXX (12/24 Volt)

The Reef Boxx is a patent pending automatic backup switch that allows users to connect battery backup in many different configurations. Its what will save your fish in a power outage and is a dream come true for the DIY aquarium keeper. you simply plug in your power brick a battery source of...

puddleaquatics.com

 

[Globe182jp]

I know this doesn't help for DIY, but have you seen these? I use a couple of them and they work very well. You can essentially BYOB (bring your own battery).

The REEFBOXX (12/24 Volt)

The Reef Boxx is a patent pending automatic backup switch that allows users to connect battery backup in many different configurations. Its what will save your fish in a power outage and is a dream come true for the DIY aquarium keeper. you simply plug in your power brick a battery source of...

puddleaquatics.com

Cody are you using it with a 12 or 24v battery?
If 24v did you have him add the booster, or just using 2 batteries?


Wish I had have seen this before. This is what I’m building but enclosed with a Voltmeter on the outside. Even come with a battery bridge to use 2 12v to make 24v and even mention a battery booster to step up the Voltage as an add on like I’m adding.

I wonder if the inside is the Tunze Safety battery deconstructed. It’s got all the same connection points.

I once I get my stuff all figured out I need to find one of these boxes ( they have a name but I can’t remember) to house it and make it look better.

 

[Globe182jp]

Just found the battery step up he’s using and it looks very similar to the one I ordered. At least I know I’m on the right party hahaha and not going rouge.

 

[Cody]

Cody are you using it with a 12 or 24v battery?
If 24v did you have him add the booster, or just using 2 batteries?


Wish I had have seen this before. This is what I’m building but enclosed with a Voltmeter on the outside. Even come with a battery bridge to use 2 12v to make 24v and even mention a battery booster to step up the Voltage as an add on like I’m adding.

I wonder if the inside is the Tunze Safety battery deconstructed. It’s got all the same connection points.

I once I get my stuff all figured out I need to find one of these boxes ( they have a name but I can’t remember) to house it and make it look better.

You can use just one or bridge the two to make 24v. It comes with the wire to do so. They have an instructional video on youtube to explain how to use it in both modes.

 

[Globe182jp]

Got it all put together and the Amazon Step up adapter works great.

My setup is Ecotech charger to 12v battery backup, to Amazon Step Up, to Tunze Safety adapter, to IM Mighty Jet. As much as I could is plug in adapters, so no modifications to the Tunze or Ecotech, or Might Jet also no need for a trickle charger since the Ecotech has it already set up.

I’ll test it and see how long it’s going last tomorrow


For the big tank I will prob use a 100AH and hook it up to one of the two return pumps.


Pretty easy if anyone wants to do it. Dont even need to solder anything if you don’t want.