shadowmaker
Solar Addict
Only main fuse size limited, not how many kWhs I sell. My four inverters are capable for 54kW, main fuse is little bigger.Any power company limits on how much you can export? Transformer limited?
Only main fuse size limited, not how many kWhs I sell. My four inverters are capable for 54kW, main fuse is little bigger.Any power company limits on how much you can export? Transformer limited?
I'm sure this could have been done better/cheaper/stronger. I'm not an engineer. It was just something that came to my mind. It has been holding for over a year now, so can't be sad. BUT it needs to hold for 20-30 years, so can't tell yet if my idea was good or not. All I know it is very rigid/strong construction with such little material used and removing one panel would be easy if needed.Did you consider a simpler mounting system? The simpler I can think of would be two aluminum U-channels: 1 at the bottom and 1 at the top, "bracing" the panels. Maybe the bottom one could be sitting atop another aluminum 2x4 which could serve to hold the weight and for cable management...
I still think it's one of the smartest ideas I've seen on the forum, and better than anything the rest of us have come up with, for far-north solar. Heck, I'm resorting to using the side of the barn and the gambrel roof (once they get the darn thing built, which is the current battle). Good on ya, man. We're a couple-dozen pages into the thread, and it's still one I go to for every post. Helped to inspire me to go ahead with off-grid solar here in the northern US.I'm sure this could have been done better/cheaper/stronger. I'm not an engineer. It was just something that came to my mind.
I still think it's one of the smartest ideas I've seen on the forum, and better than anything the rest of us have come up with, for far-north solar. Heck, I'm resorting to using the side of the barn and the gambrel roof (once they get the darn thing built, which is the current battle). Good on ya, man. We're a couple-dozen pages into the thread, and it's still one I go to for every post. Helped to inspire me to go ahead with off-grid solar here in the northern US.
and now something like 15 and full sun every day
Send it here please..I know. It's horrible - way to hot!
I don’t know how your ancestors survived without air-conditioning.I know. It's horrible - way to hot!
True. I got everything to start building my next array of panels, but not with this heat. Also there has been so much production lately that I can just focus on other things just now.I know. It's horrible - way to hot!
They were tough like six inch nails, but we are more like latte people with raised pinky finger nowadays. Me included.I don’t know how your ancestors survived without air-conditioning.
Isn't there a setting to adjust the cell full and / or the pack full voltage in the BMS software? This would let you charge to a lower voltage.Seems there is a problem (or just annoying me) with getting my LFPs to top balance themselves. Unlike Andy @Off-Grid-Garage reported, these shitty internal 50mA passive balancers are eventually balancing out my batts. Slowly but steadily. Most certainly it has all to do my batts being full for ~10-15 hours almost every day now, so to my surprise even small balancing current seems to be enough. First my 3x 5kWh wall batts got balanced and now 4/6 of my 10kWh rack batts are balanced too. Those two that haven't have different situation because some low voltage cells in them. This means that 50mA balancer needs to burn excess from 14-15 cells to level up those low ones, so it is going to take some time. I could open those two up and install Neeys on them or just charge those few low cells individually. But it is already obvious that they are going to balance out if they just get enough time to do so, so not going to bother.
Problem (annoying thing) with top balanced batts is closed loop communication or at least it is with my setup. Closed loop tells to charge with 56,5V (3,53V/cell) so "full battery" is never triggered as it happens only when one cell goes over 3,6V. This means my capacity % starts to drift. Instead being full at 56,5V they soon start saying capacity is 99% and then 98% and then... It takes 3-4 days to get down 97% and then I just adjust full capacity manually using BMS tool. It only takes few minutes to do, but it is annoying. I don't seem to find any setting using BMS tool to fix this so I have asked batt manufacturer what to do but haven't got answer yet. Let's see what they suggest.
I'm pretty sure there is but can't find it. Maybe the password they gave me before is only for restricted access and I need some kind of master password to change closed loop related parameters? I have noticed a table of parameters that only exists for a fraction of a second when I go to certain page on my BMS tool. It disappears so quickly that I can't see what's in there. I bet they won't give me that master password, but they might give me new file to update these batts once again.Isn't there a setting to adjust the cell full and / or the pack full voltage in the BMS software? This would let you charge to a lower voltage.
Might find some info here.I'm pretty sure there is but can't find it. Maybe the password they gave me before is only for restricted access and I need some kind of master password to change closed loop related parameters? I have noticed a table of parameters that only exists for a fraction of a second when I go to certain page on my BMS tool. It disappears so quickly that I can't see what's in there. I bet they won't give me that master password, but they might give me new file to update these batts once again.
I don't see the point to charge my batts any higher than current 56,5V (3,53V/cell) and I think even 55,0V (~3,44V) would be just fine and high enough to decent enough top balance. With these cheapo batteries I'm not that sure that even "perfect" top balance will help with bottom balance. I bet my cells aren't capacity matched so when discharged it's more up to chance than how they are top balanced.
I think my batts have Topband BMS in them, but not sure. I translated some Chinese from BMS tool they gave me and it came up with that name. BMS itself has no labeling to tell anything about its origin. I know Topband is used in Ruixu batteries, but other than that it seems rare.Might find some info here.
yeah hopefully just loose sense wires. I have a random “gokwh” 5 kWh showing up tomorrow hopefully it does better but will grab internal shots for science.Two new 10kWh batts arrived.
First one.
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Second one.
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5117mV is impossible and all three faults are similar so I'm betting there are loose/faulty voltage detection/balancer wires. Need to open up these to see. This is what you get going for cheapest. Oh well, I don't mind opening them up and installing decent balancers while doing that.