Grundfos SQ series ac pumps are the only pumps I've ever run across that run perfectly on just about ANY inverter over 1000w. if planning on running a well pump offgrid they are the only system I've ever seen that JUST WORKS. (for domestic use, irrigation is a different animal) Everything else...
Signature Solar's business model seems to be "stand behind any new offering that we are trying to hype, but when things we've decided not to reorder have problems, ghost the buyers unless they humiliate us on the forums" If they are selling something that is revealed to have known problems they...
I can confirm that the 13.8 cutoff is due to poor pack balance. I added an active balance board and after properly balancing the pack the bms wouldn't cut out until 14.4-14.6. I've torture tested @12v and around 85a on a single battery and they passed with flying colors, however on a 48v...
Lol case in point, I bought a Schneider context 4024 with the same thinking, just stack on more when the need arises, but from the best... then Schneider decided to stop all parallel support for the 4024 and upgrade firmware to make it impossible to stack the newer models.
Don't trust any...
just got 32 in ordered thurday night shipped friday delivered monday, ordered 33, but one didn't get shipped. Got a tracking number, but it shows never picked up. Emailed them about it. I'm not to worried about it, I ordered 1 extra jic and they all arrived in decent condition, no shipping...
based on what I'm seeing so far, I think the cells where not balanced before assembly. Basically the normal bms balance is 10-50ma that can only be used effectively during the last 10% of a charge. this is plenty to KEEP healthy cells balanced, however it is not nearly enough to actually balance...
Line loss. There are other solutions besides a grundfos sq. But most are overly complicated. Low voltage dc suffers from extreme line loss at depths over 100 ft. Most other offgrid systems are either double pump systems that fill a holding tank or some other convoluted setup, or people end up...
Jim Gee recently reached out to me and said he has had plug and play stand alone balance boards made for these, and will provide them free of charge to anyone that had purchased batteries from him and wants one. He sent me an install video, looks like you remove the battery top, unplug the...
time for an update. It has been an incredibly mild winter, so I've only seen -20f so far, but the freezer battery box is working beautifully. It started out cycling the heating pad most nights and never dropping under 50f, then I realized I had enough spare power to run a small 500w space heater...
growatt's lf inverters are ETL listed as ul1741 compliant. I've tried to attach the cert but it's a pdf and the forum won't let me. so I copy pasted the list and the download link
Intertek Testing Services NA Inc.
545 East Algonquin Road, Arlington Heights, IL 60005
Telephone 800-345-3851 or...
well, on testing the first battery, I can confirm balance issues. opened it up and checked the balance leads after it was cutting off at 13.75v. 3.37-3.37-3.37-3.64 I've got the balance leads disconnected from the bms, and hooked to a heltec 5a active balancer. will update
I was testing these for use in multiple systems. I bought a pallet of 30 batteries. I ended up completely replacing the individual bms's on 8 batteries with 1 external bms for a 48v system. If I was to start over, I would not purchase these. for a 48v system I would probably just get a server...
from what I've personally seen pretty much all lifepo4 cells plump a little at full charge. In a typical cell not always enough to puff the outer case-probably because they have a little room to grow inside. So 152ah jelly roll in a 120ah case would be a lot more noticeable w/o necessarily...
I just finished my shop battery. In my half insulated "I'll finish it one day I promise" shop I have built a 375ah 48v 16s15p topband 25ah cell battery. I assembled it in 3 layers in a small deep freeze. I wired the bms in with the battery and put a 20watt propagation mat between battery layer...
last cell just showed up, good condition shipped in the same boxes the 4 packs shipped in with just 1 cell in it. to bad their shipping csalculator doesn't function better. this box could have easily fit a couple bms's and accessories which I didn't order because fedex shipping went away when I...
Another update/warning. Started building a 4 battery 24v pack today. The design choice of using a piece of highly conductive aluminum as a handle almost lead to a disaster while installing bus bars.
If you're running flat bus bars across the top of multiple batteries, be sure to thoroughly...
If you're moving the shed, swap the pump to a grundfos sq and use your current system. Also add a pitless adapter to the well casing and you don't have to worry about freezing.