Matthew judah
New Member
I’m getting ready to order eight more batteries right now. I have four. How many can I add to one 6000 XP
Don't see why there would be a limit as long as they are 48v and have bms's for each battery. I have ~160 kwh's of batteries on my 3 6000 xp's in parallel.I’m getting ready to order eight more batteries right now. I have four. How many can I add to one 6000 XP
Yeah, you’re right. These batteries are all 48 V exactly the same same brand Aolithium. I’m just wondering about communications.Don't see why there would be a limit as long as they are 48v and have bms's for each battery. I have ~160 kwh's of batteries on my 3 6000 xp's in parallel.
I suppose I could hook up maybe three or four of them to the Eg4 chargverterDon't see why there would be a limit as long as they are 48v and have bms's for each battery. I have ~160 kwh's of batteries on my 3 6000 xp's in parallel.
lol if I could exceed 1 million that be something elseDon't exceed one million.
I am using JK BMS's in all my batteries which are running in parallel with each other and communicating closed loop with the inverters. You can also have them open loop with the inverters as well though if you wanted. As long as each battery has a bms and knows when to cut off charging/discharging for each battery.Yeah, you’re right. These batteries are all 48 V exactly the same same brand Aolithium. I’m just wondering about communications.
You should be able to parallel up to 16 of the AOlithium 100Ah server rack units.Yeah, you’re right. These batteries are all 48 V exactly the same same brand Aolithium. I’m just wondering about communications.
I think you actually can see it see @Gavin Stone video for details with his power pro batteries. here is the link to his videoFor those paralleling multiple batteries, I've observed that once we got past a 1:1 ratio of inverter to battery and winter set in, the batteries started drifting far apart once we couldn't regularly get to 100% SOC. We now have three 6000XPs and five PowerPro batteries. When we had just three batteries (the original plan), they stayed in almost perfect synchronization. With 5, I'm seeing up to about a 25% SOC variation. And because I read battery SOC through the inverters (not the best design, @EG4TechSolutionsTeam), I don't know this is happening unless I go to the mechanical room and physically look at the screens.
I don't know that this is too much of a problem overall, and with the recent addition of 4KW of additional panels (and longer days) I'm not overly concerned. But the additional batteries definitely caused a wider SOC variation, so keep that in mind folks. It makes me less eager to allow the overall bank to go much below 30%, as I fear at least one battery may be depleted.
For those paralleling multiple batteries, I've observed that once we got past a 1:1 ratio of inverter to battery and winter set in, the batteries started drifting far apart once we couldn't regularly get to 100% SOC. We now have three 6000XPs and five PowerPro batteries. When we had just three batteries (the original plan), they stayed in almost perfect synchronization. With 5, I'm seeing up to about a 25% SOC variation. And because I read battery SOC through the inverters (not the best design, @EG4TechSolutionsTeam), I don't know this is happening unless I go to the mechanical room and physically look at the screens.
I don't know that this is too much of a problem overall, and with the recent addition of 4KW of additional panels (and longer days) I'm not overly concerned. But the additional batteries definitely caused a wider SOC variation, so keep that in mind folks. It makes me less eager to allow the overall bank to go much below 30%, as I fear at least one battery may be depleted.
Yes the more batteries you have the larger the load threshold is for each BMS to be able to 'see' the current draw.. The large format batteries solved some of the issue which is worse with the server rack form factor.For those paralleling multiple batteries, I've observed that once we got past a 1:1 ratio of inverter to battery and winter set in, the batteries started drifting far apart once we couldn't regularly get to 100% SOC. We now have three 6000XPs and five PowerPro batteries. When we had just three batteries (the original plan), they stayed in almost perfect synchronization. With 5, I'm seeing up to about a 25% SOC variation. And because I read battery SOC through the inverters (not the best design, @EG4TechSolutionsTeam), I don't know this is happening unless I go to the mechanical room and physically look at the screens.
I don't know that this is too much of a problem overall, and with the recent addition of 4KW of additional panels (and longer days) I'm not overly concerned. But the additional batteries definitely caused a wider SOC variation, so keep that in mind folks. It makes me less eager to allow the overall bank to go much below 30%, as I fear at least one battery may be depleted.
A string of 5 batteries in parallel with the load/charger connected diagonally will experience substantial battery current unbalance.For those paralleling multiple batteries, I've observed that once we got past a 1:1 ratio of inverter to battery and winter set in, the batteries started drifting far apart once we couldn't regularly get to 100% SOC. We now have three 6000XPs and five PowerPro batteries. When we had just three batteries (the original plan), they stayed in almost perfect synchronization. With 5, I'm seeing up to about a 25% SOC variation. And because I read battery SOC through the inverters (not the best design, @EG4TechSolutionsTeam), I don't know this is happening unless I go to the mechanical room and physically look at the screens.
I don't know that this is too much of a problem overall, and with the recent addition of 4KW of additional panels (and longer days) I'm not overly concerned. But the additional batteries definitely caused a wider SOC variation, so keep that in mind folks. It makes me less eager to allow the overall bank to go much below 30%, as I fear at least one battery may be depleted.
lol if I could exceed 1 million that be something else
I wonder how bad this is with the Ruixu 10-stack cabinet..A string of 5 batteries in parallel with the load/charger connected diagonally will experience substantial battery current unbalance.
See: https://diysolarforum.com/threads/calculation-of-parallel-string-currents-addendum.94178/
It must be more of a problem with more cells in a 48v vs say just 12v with 4 cells. I'm pushing my 3rd winter with 8 parallel SOK 12v batts (20kwh total) with zero issues. I have gone on long stretches scraping the bottom of SOC. Never had a battery drop out yet and I check them often. Also, I have heard SOK is good on matching cells but that is what I have "heard" so...For those paralleling multiple batteries, I've observed that once we got past a 1:1 ratio of inverter to battery and winter set in, the batteries started drifting far apart once we couldn't regularly get to 100% SOC. We now have three 6000XPs and five PowerPro batteries. When we had just three batteries (the original plan), they stayed in almost perfect synchronization. With 5, I'm seeing up to about a 25% SOC variation. And because I read battery SOC through the inverters (not the best design, @EG4TechSolutionsTeam), I don't know this is happening unless I go to the mechanical room and physically look at the screens.
I don't know that this is too much of a problem overall, and with the recent addition of 4KW of additional panels (and longer days) I'm not overly concerned. But the additional batteries definitely caused a wider SOC variation, so keep that in mind folks. It makes me less eager to allow the overall bank to go much below 30%, as I fear at least one battery may be depleted.
The chart shows how bad the unbalance becomes for 8 batteries compared to 5 batteries. Ten batteries will be just that much worse than eight for the total diagonal connection. Connecting more toward the middle would help a lot but I haven't done the math for that case so I can't say where best to make the connection.I wonder how bad this is with the Ruixu 10-stack cabinet..
I wonder how bad this is with the Ruixu 10-stack cabinet..
Are you using the total diagonal connection to the 8 parallel batteries?It must be more of a problem with more cells in a 48v vs say just 12v with 4 cells. I'm pushing my 3rd winter with 8 parallel SOK 12v batts (20kwh total) with zero issues. I have gone on long stretches scraping the bottom of SOC. Never had a battery drop out yet and I check them often. Also, I have heard SOK is good on matching cells but that is what I have "heard" so...
The choice of 100A per battery is just a mathematical convenience. When a calculated current is not 100A but, say, 113A you can see in an instant that the error is 13%.I'd like to see the inverter setup that can pull 100A out of 10 batteries at a time. Heck, even 50A, would be 500A, that's over 24kw of power... For a surge load, sure, but that's a ton of power for a continuous load.
The choice of 100A per battery is just a mathematical convenience. When a calculated current is not 100A but, say, 113A you can see in an instant that the error is 13%.
Balance is not affected by how much draw except as second order effects.Ok, so you chose 100A for math reasons, fine. Is it a linear scale, in how far apart they are, based on current draw? Aka, if I'm only drawing 20A from each battery, is it better for the balance?
Balance is not affected by how much draw except as second order effects.
It's linear. If you're drawing 20A per battery just divide the values in the chart by 5