APC 1000 ups How long will it run 400W test with 24Ah lifepo4 32700 8s DIY battery 24v
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- เผยแพร่เมื่อ 23 ส.ค. 2023
- Iv built this so I can run my fridge in my caravan when driving to and from wherever I want to go on holiday. My fridge runs at 150w almost constantly so now with this ups (uninterrupted power supply) I can have cold milk and frozen ice cream upon arrival instead of warm milk and cold wet cream.
Thanks for watching :)
I wonder if a jackery ,anker or vtoman would last as long ??
On testing the battery runs down to 3v per cell and charges up to 3.4v per cell so it’s well within the BMS limits (so the BMS is not forcing the unit to power of it will just do this by itself)
As the swap from lead to lifepo4 has changed the voltage slightly.
Any questions please ask and I’ll do my best to answer them. - วิทยาศาสตร์และเทคโนโลยี
9:27 Did the UPS LVP shut it down or the 8s4p bms shut it down?
Strange that it’s saying 24v is 0% SOC unless they are using only 50% DOD for AGM batteries. Too bad theres no setting for LiFePO4 SOC.
The 32700 threaded terminal is my favorite storage battery/low drain battery. Looks like the one you made would work good for 400w (1c) and can carry the full 800w (2c) anywhere you need to be running a heater. Lol
The inverter LVP shut it down at the end. The cells didn’t go to minimum 2.5v (2.95v was the min) . It works well for what I need so that’s all that really counts :) Iv got a 12v test to do with a 240w inverter also.
@@smartazz , I’m sure it will work like a charm. The nice thing is any charge voltage that works with 3p AGM is going to work for 2p LiFePO4, including float voltage.
@@imho7250 absolutely. And the added extra of a BMS will keep the cells safe (hopefully lol)
@@smartazz, yes, because you never know what goes on inside. The battery im refurbishing had 10 dead cells so 2 cell groups were near LVP. I suspect they hit LVP and she was able to limp home in tirtle mode after release. I set release just slightly above lvp so she wouldn’t get stranded without warning, lol
I was tempted to change to the JK because they are affordable now. But the only reason was because #4 had a cel that would self discharge just enough to be annoying. 0.6a active balance would fix that 6x faster than my ANT’s passive balance.
Im not sure how a dumb BMS would work because it will never have a chance to balance the battery when using a AGM charger. On the 20s6p i still use the AGM charger but its the OVP is set just slightly above float voltage, and then balance limit is set to balance at float voltage.
With a basic BMS I don’t think it will do anything. The charger circuit on a UPS will either strictly be float, or bulk then float. Neither will hold the cells in the balance voltage range of a basic bms.
So probably if a smsrt BMS was too expensive for a small battery it will need a basic BMS, an active balancer, and a visit to Repackr dot com. Lol.
Im testing all 120 cells for my girlfriend’s scooter now but i will make her type them all so I can paste them in repackr. But since i have 20 new cells and I want those spread out 1 per brick, i need to first find 20 of my old cells that will match as 2p, then i can enter the other 80 cells in Repackr and it will tell me which other 4 cells to add in each group.
Its a royal pain but definitely worth it. Last time my method for testing cell capacity was sketchy but since i first made a 5p and drained it till low voltage, i was able to identify which bricks needed more capacity and i beefed those up by adding stronger cells to them and weaker cells to the strongest bricks.
This time my testing method is 10x more accurate so I’m expecting all 20 bricks to get below 2.9v before the first one hits 2.5. Hopefully better. We will see after another week of testing cells one at a time. Lol
@@imho7250 awesome I love it. Keep on testing and repacker is just an amazing tool to use for making battery’s. I have on my battery an extra 8s connector so I can connect my i8 charger to balance and charge with speed if I need it. I’ll test it soon just to see how imbalanced the cells are.