diy solar

diy solar

Search results

  1. nifty-stuff.com

    Bluetti EP900 to Power your House

    Update: I asked Bluetti support the following: Question: "Can the EP900 keep my Enphase solar system running off-grid? Do you have any systems that do this (or will you)? This is one feature that Powerwall, FranklinWH, etc., advertise as a big positive with their systems." Answer: "Yes, the...
  2. nifty-stuff.com

    Bluetti EP900 to Power your House

    I just watched a handful of the videos on the EP900 and EP800. From what I understand: I can have my 9kw enphase array feeding AC into this unit AND also have 9kw of DC from two more arrays feeding into this unit together at the same time? When the grid is up, both of the solar inputs (one from...
  3. nifty-stuff.com

    New Delta Pro Ultra and Smart Panel 2

    I also have 200 amp panel. With a system like the Delta Pro Ultra + Smart Panel 2, I was assuming I would / could have my existing main pane with all my misc. circuits, and then have the 12 circuits in the SP2 for "critical loads". This unit is definitely not "whole house backup", but I'm...
  4. nifty-stuff.com

    EcoFlow Delta Pro Ultra

    Wow, it seems every youtuber and their mother is getting / reviewing these units!! It does look pretty interesting. Seems like it's relatively easy to setup, and using the Smart Panel 2 for critical loads and for managing TOU arbitrage is cool. Bummer it doesn't allow for the grid-tied solar...
  5. nifty-stuff.com

    California Members: NEM3.0 impact on NEM1/2 customers and what to do?

    This is SUPER helpful, thanks! It sure would be GREAT if this was clearly spelled-out / written somewhere official that customers could review and reference! So, it's pretty clear that going from NEM 1 to NEM 2 (especially extending for another 20 years) is ideal when compared to NEM 3?
  6. nifty-stuff.com

    DIY CPAP UPS - LiFePO4 Battery - Dead Simple DC Power For CPAP

    Thanks. I didn't think I needed a "smart" / fancy charger, but I guess that's the best/safest way to go?
  7. nifty-stuff.com

    DIY CPAP UPS - LiFePO4 Battery - Dead Simple DC Power For CPAP

    Unsurprisingly, this cheap one from China has zero specs and I'm guessing no OL/OC protection :( I guess to cover my bases I should upgrade to a MeanWell with built-in fan?
  8. nifty-stuff.com

    DIY CPAP UPS - LiFePO4 Battery - Dead Simple DC Power For CPAP

    That's helpful, thanks! Sorry, I wasn't very clear. I should have said "discharged to 70%". I believe it's just a 10 Amp dummy power supply set at 13.6v output. There is no way to control the current as far as I know. I thought it would just deliver 10A continuously and safely (even without a...
  9. nifty-stuff.com

    DIY CPAP UPS - LiFePO4 Battery - Dead Simple DC Power For CPAP

    Update: I drained the battery by about 30% and then plugged in the power supply. I should have been, but wasn't measuring the DC from the PS, but going into the PS was 225 watts via the AC killawatt. ... and the power supply was getting TOASTY hot. Not "melting plastic" hot, but also too hot to...
  10. nifty-stuff.com

    DIY CPAP UPS - LiFePO4 Battery - Dead Simple DC Power For CPAP

    OH! weird... thanks for pointing that out. is it showing now?
  11. nifty-stuff.com

    DIY CPAP UPS - LiFePO4 Battery - Dead Simple DC Power For CPAP

    I appreciate all the help and feedback! I ended up just going with the Renogy 100Ah AGM. Here's my setup so far (it's a mess, but still just testing everything before I fully commit). I've got the power-supply unplugged to just test the 12v outlet. I've got a 12v plug (a 3D printed a...
  12. nifty-stuff.com

    DIY CPAP UPS - LiFePO4 Battery - Dead Simple DC Power For CPAP

    Seems like the info on this is mixed. It sure would be nice if balancing wasn't an issue / concern with LFP.
  13. nifty-stuff.com

    DIY CPAP UPS - LiFePO4 Battery - Dead Simple DC Power For CPAP

    That's basically what I understand would be required to keep the internal LFP cells in "balance"... basically going to FULL every few months. (something I'm not able/willing to do with Grandpa's system). I'm honestly surprised that all these units don't have a fancy BMS that automatically...
  14. nifty-stuff.com

    DIY CPAP UPS - LiFePO4 Battery - Dead Simple DC Power For CPAP

    The Renogy AGM battery came today and it was sitting at a nice 12.7 volts. I set the power supply at 13.4v and connected it with a volt and ammeter and (as expected) saw the voltage drop down a little and the current started "high" at about 5 amps, and quickly dropped down lower and lower and...
  15. nifty-stuff.com

    DIY CPAP UPS - LiFePO4 Battery - Dead Simple DC Power For CPAP

    Nope, a cheap one, so I don't have super high expectations of it and might go with a meanwell once I've tested everything. Thanks @justgary for your post! Yes, I think VERY VERY rarely Ah, good point that the CPAP isn't quiet. I think I'm just thinking about the morning / during the day when...
  16. nifty-stuff.com

    DIY CPAP UPS - LiFePO4 Battery - Dead Simple DC Power For CPAP

    The cheap 12v 10amp "Regulated Switching Power Supply" arrived today and I can fine-tune it all the way up to 14.4 volts... so hitting 13.x for AGM will be no problem. :) The other bits are (hopefully) coming tomorrow... but as I've been testing the power supply some questions came up: I...
  17. nifty-stuff.com

    DIY CPAP UPS - LiFePO4 Battery - Dead Simple DC Power For CPAP

    For charging I think I'm going to get one of those cheap 12V 10A DC Power Supply Universal Regulated Switching AC to DC Converters: ... and hope I can adjust it as high as 13.8V. If not, maybe I'll just stick with one of the simple adjustable wall-wart AC adapters that is around 2-3 amps.
  18. nifty-stuff.com

    DIY CPAP UPS - LiFePO4 Battery - Dead Simple DC Power For CPAP

    Ok, I'm pretty sure I'm going with the Renogy 12 Volt 100Ah battery. Now I just need to decide the best-value way to keep it topped-up. I don't need an expensive super-high-amp charger. I'd like to think that one that does 2-5 amps would be plenty. Should I go with one that I can set the...
  19. nifty-stuff.com

    California Members: NEM3.0 impact on NEM1/2 customers and what to do?

    Who here is good with data & math? I called PG&E solar support about my questions above and they said they didn't know, so they referred me to email the "interconnection dept"... and I'm waiting to hear back. In the interim, I'm curious about something: Supposedly, just adding 10% or 1kW more...
  20. nifty-stuff.com

    DIY CPAP UPS - LiFePO4 Battery - Dead Simple DC Power For CPAP

    Thanks for finding / pointing out those graphs! Yup, and this is why you've got me about 91.25432% convinced that I should shift-gears to AGM. My girlfriend (again, this is a project she gave me for her Grandpa) is expecting maybe 2-5 outages a YEAR... and of those, most being only about 1-2...
  21. nifty-stuff.com

    DIY CPAP UPS - LiFePO4 Battery - Dead Simple DC Power For CPAP

    Great stuff, thanks for all that! So, I guess I need to really forget al the LFP hype (at least for this application) and go with AGM sitting at a float around 13.8?
  22. nifty-stuff.com

    DIY CPAP UPS - LiFePO4 Battery - Dead Simple DC Power For CPAP

    Hmm... after reading your comments @sunshine_eggo and watching this video, I'm wondering if this Renogy Deep Cycle AGM Battery 12 Volt 100Ah battery would be a better fit? (On sale at Walmart for $189). I guess even if only discharged down to 50%, it *should* still give Grandpa 3 solid-nights...
  23. nifty-stuff.com

    DIY CPAP UPS - LiFePO4 Battery - Dead Simple DC Power For CPAP

    Thanks for all that! Was that a permanent loss, or just until the cells were re-balanced? I was wondering about this when I started the project and was hoping that LFP would be better "all around" :( Now I'm curious... which is "worse" or "better" and to what degree? LFP maintained at 14.4...
  24. nifty-stuff.com

    DIY CPAP UPS - LiFePO4 Battery - Dead Simple DC Power For CPAP

    Bummer since I'm not going to be able to manually go in and rebalance / change the charging profile of the battery all the time. Do most LFP battery manufactures require rebalancing / top-charging to maintain the health of the battery (and the warranty)? Other than manually full-charging the...
  25. nifty-stuff.com

    DIY CPAP UPS - LiFePO4 Battery - Dead Simple DC Power For CPAP

    Update: I just watched videos on the Mean Well power supplies. I see some have adjustment pots for the output voltage... very nice! One concern / question: Are the fans always on with these supplies? I HATE that with my 3D printer and the power-supply is always on. I don't want to do that to...
  26. nifty-stuff.com

    DIY CPAP UPS - LiFePO4 Battery - Dead Simple DC Power For CPAP

    I figured I'd do a full-charge on my benchtop power-supply every 6 months or so... but I didn't think (with the BMS, etc.) that forcefully balancing would be needed more often than that, no? Ya, I go back and forth about that. I might go with something more powerful / higher Amps. I thought...
  27. nifty-stuff.com

    DIY CPAP UPS - LiFePO4 Battery - Dead Simple DC Power For CPAP

    Hmm... valid points. I've wanted to be extra careful not to degrade the cells having them at a constant "charge" that is too high. So, I'm now thinking about getting one of these that can be set to 13.5 V The watts is SUPER small... it's only 3A, so it would probably be only 40 watts. Not a...
  28. nifty-stuff.com

    DIY CPAP UPS - LiFePO4 Battery - Dead Simple DC Power For CPAP

    Brilliant, thanks for the quick replies guys!!! Since I'm (probably overly) worried about cell longevity, I thought keeping the LFP battery at around 3.3V (which *should* be about 90% full) would be a great way to go... and if I'm using a 100Ah battery, then 90% is PLENTY for Grandpa's needs...
  29. nifty-stuff.com

    DIY CPAP UPS - LiFePO4 Battery - Dead Simple DC Power For CPAP

    I felt like I was hijacking / monopolizing this awesome CPAP discussion: How to power a cpap ... so I thought our of respect for the guys in that thread, I'd start my own thread. :) Short Details: The SF Bay Area has had a lot of blackouts and my girlfriend's elderly Grandfather wants a...
  30. nifty-stuff.com

    How to power a cpap

    FYI: I emailed EcoFlow about potentially using either the RIVER 2 Max or the River Pro for Gpa's CPAP. Mostly asking about leaving it on and plugged-in 24/7. Basically they said: "If the station is used as an EPS for a long period, please ensure that the station is always updated to the...
  31. nifty-stuff.com

    Replacing UPS lead acid batt w LiFePO4

    I think I just got "lucky"??? When I first hooked the two batteries up in series, I put a meter on them and watched them VERY VERY closely over the next few hours to see what the charge-voltage settled-in at. I don't think I've ever seen them get higher than 26.5 V. (Since I know UPS's will...
  32. nifty-stuff.com

    How to power a cpap

    Interesting, I've never seen them before. That approach definitely seems more expensive. What features / options is that inverter-charger providing that is better (for my use-case) than what I mentioned here? https://diysolarforum.com/threads/how-to-power-a-cpap.15679/post-684331 Ya, I'll...
  33. nifty-stuff.com

    How to power a cpap

    Do you mean the one I linked / pictured above? I have to imagine / hope it's made for 24/7/365 use... but I guess no way to really know for sure?
  34. nifty-stuff.com

    How to power a cpap

    Great question! The request was made for me to help them find a solution for the CPAP. I haven't heard of issues with the other items (yet). So, for now, I'm just focusing on the CPAP :)
  35. nifty-stuff.com

    How to power a cpap

    I would, but: 1) None (under $500) are LFP that I can find. 2) He'd like it to run for 3 days, and I don't see any UPS systems (under $500) created for multi-day power 3) AC inverter losses are pretty big
Back
Top