I use similar little LiFePO4 batteries as DC UPSs for small devices. No AC inverter. I use one for the home alarm system, and one for the internet cable-modem in the garage. Both run off of 12V so a battery is more or less just connected directly to the device. 20Ah lasts 2 days @ 5W, roughly. The only downside is that my solution to keep them charged is roughly $100. A USB-C power block plugged into the mains, a 19VDC USB-C cable, feeding 19VDC into a little Victron 75/15 charge controller. For a UPS application you charge LiFePO4 to 14.2V and float at 13.4V. I haven't noticed any capacity degradation after roughly 3 years (so far), even though the batteries are being held at their float more or less forever. -Matt
@@junkerzn7312 I use a similar setup at home. I put a couple of 40 watt solar panels in the upstairs window years ago and now I finally have a use for them. 2x7.2ah LiFeP04 batteries in parallel and a victron 75/10 charge controller. Modem, router, hubs etc are all 12 volts anyway so I've connected them directly. So network is maintained during a power cut. For non sunny days I've set up a changeover relay that switches an old 19v laptop charger into the charge controller in place of the solar panels. I set the charge current in the victron app to 4 amps maximum so that the laptop PSU doesn't trip. ( It would if it was left at the default 10 amps).
That looks like quite a stack of batteries! I've been watching these little batteries because I have several small UPS systems on computers and they use small lead-acid batteries that need replaced every 2-3 years. Lead is very annoying... The big problem with a LiFePO4 replacement is the limited current thru the BMS. For example, a 1500va (va is the same as watts if the power factor is 1.0) UPS has 2 12v 9ah batteries in series for 24v D.C. 1500va / 24v is 62.5 amps. I don't actually run them that hard. I'm more in the range of 500-700va. 700va / 24v is just under 30a. There is no LiFePO4 in the same size as a 12v9ah (usually 7ah to 9ah are the same size) that can deliver 30a. I have found some that will do 20a and I'm considering it... (A second problem is charging, but 13.6v to 13.8v typical on a lead-acid UPS system will adequately but very slowly charge LiFePO4 in my experience.)
Great video. I live in one of the 189 countries that use metric measurements not imperial. Any chance you could flash the metric equivalents on screen please? Final question, shouldn't a 12ah LFP battery be able to draw 12 amps for sixty minutes?
My apologies. I'm trying to remember to put the conversion on the screen. I believe it is because of the small size that the batteries can't pull 100% of their capacity.
Nice to see a review of the smaller batteries. I have several of rhem they're great for projects or for running an ebike safely. I do find that they all fall slightly short of advertised capacity, but it's not really a problem. Just factor it into the calculations.
I have the 18ah and yesterday went dead while using a fish finder. Volt was in the 12s when I started. The problem is my charger is not charging it. Do you know how to reset one of these little batteries. My charger works with my other batteries, so I know it's not the charger.
hey i got a question why are companies all going to LIFEPo4 batteries instead of lithium ion batteries just wonder if you know why or not but yeah i thought about buying one of these but will see i want a 100amp battery so i can run a coffee maker when the power goes out lol and yeah my power went out 4 times this week and the first time it was out for 2 days so i need these batteries not want i need
I use similar little LiFePO4 batteries as DC UPSs for small devices. No AC inverter. I use one for the home alarm system, and one for the internet cable-modem in the garage. Both run off of 12V so a battery is more or less just connected directly to the device. 20Ah lasts 2 days @ 5W, roughly.
The only downside is that my solution to keep them charged is roughly $100. A USB-C power block plugged into the mains, a 19VDC USB-C cable, feeding 19VDC into a little Victron 75/15 charge controller. For a UPS application you charge LiFePO4 to 14.2V and float at 13.4V.
I haven't noticed any capacity degradation after roughly 3 years (so far), even though the batteries are being held at their float more or less forever.
-Matt
@@junkerzn7312 I use a similar setup at home. I put a couple of 40 watt solar panels in the upstairs window years ago and now I finally have a use for them. 2x7.2ah LiFeP04 batteries in parallel and a victron 75/10 charge controller. Modem, router, hubs etc are all 12 volts anyway so I've connected them directly. So network is maintained during a power cut. For non sunny days I've set up a changeover relay that switches an old 19v laptop charger into the charge controller in place of the solar panels. I set the charge current in the victron app to 4 amps maximum so that the laptop PSU doesn't trip. ( It would if it was left at the default 10 amps).
Thanks for the info and the comment.
That looks like quite a stack of batteries! I've been watching these little batteries because I have several small UPS systems on computers and they use small lead-acid batteries that need replaced every 2-3 years. Lead is very annoying... The big problem with a LiFePO4 replacement is the limited current thru the BMS.
For example, a 1500va (va is the same as watts if the power factor is 1.0) UPS has 2 12v 9ah batteries in series for 24v D.C. 1500va / 24v is 62.5 amps. I don't actually run them that hard. I'm more in the range of 500-700va. 700va / 24v is just under 30a. There is no LiFePO4 in the same size as a 12v9ah (usually 7ah to 9ah are the same size) that can deliver 30a. I have found some that will do 20a and I'm considering it...
(A second problem is charging, but 13.6v to 13.8v typical on a lead-acid UPS system will adequately but very slowly charge LiFePO4 in my experience.)
Thank you for the great information and comment!
I have the 18Ah and the 30Ah XZNY battery that I use for a 12v cooler and my ham radio both work great
Thanks for sharing and the comment.
Great video. I live in one of the 189 countries that use metric measurements not imperial. Any chance you could flash the metric equivalents on screen please?
Final question, shouldn't a 12ah LFP battery be able to draw 12 amps for sixty minutes?
My apologies. I'm trying to remember to put the conversion on the screen. I believe it is because of the small size that the batteries can't pull 100% of their capacity.
Nice to see a review of the smaller batteries. I have several of rhem they're great for projects or for running an ebike safely. I do find that they all fall slightly short of advertised capacity, but it's not really a problem. Just factor it into the calculations.
Thanks for sharing and for the comment!
You should do a run test on something like a Garmin Fish Finder.
Great idea. Thanks for the comment.
are you testing its capacity until the bms cut off or you set a cutoff voltage to stop the test?
The capacity test is until the battery BMS shuts it down.
If you used these in a razor scooter, wouldnt you need to install a lifep04 specific charger?
If the charger is set to charge up to 14.6v and stop, you should be fine.
@@OffGridBasement the stock razor charger is only set for 12 something bolts I believe. So that’s why I was curious
I have the 18ah and yesterday went dead while using a fish finder. Volt was in the 12s when I started. The problem is my charger is not charging it. Do you know how to reset one of these little batteries. My charger works with my other batteries, so I know it's not the charger.
Touch the leads with another 12v source. You can use your car battery. That should do the trick.
CAN PUT A SMALL 12V FRIDGE IN THIS BATTERY..?
Yes. It would probably give you 2 to 3 hours of runtime
Cool
you should do a video to see how long you can run your A/C with those batteries
They can’t support the current draw
@@bigguyprepper no way?
The surge would overpower the battery. I don't think it would kick on. Thanks for the comment.
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whats the max amps these can put out lol never mind you answered my questions lol
hey i got a question why are companies all going to LIFEPo4 batteries instead of lithium ion batteries just wonder if you know why or not but yeah i thought about buying one of these but will see i want a 100amp battery so i can run a coffee maker when the power goes out lol and yeah my power went out 4 times this week and the first time it was out for 2 days so i need these batteries not want i need
Safety and recharge repeatability. You can charge and discharge lifepo many more times. Many videos available.
Lithium ion also has a bad rap for catching on fire. Customers feel more confident in the safety and stability of lifepo4.