Basen Green DIY Case 48V V2

[toruonu]

So sorry for not posting sooner, was busy travelling a lot in the last month. So I got the units, assmbled them and got them into use. The manual is a bit crap, but they also had a video so two combined I was able to build it up. In my unit it also has an active balancer so I think there are different versions out there and it also has I think a proper cells placement as all busbars are the same length. I've added pics from during assembly.

The default settings of course were a bit crap. First off when trying to discharge below 20% it started to oscillate around 16% range. That was cured by a firmware update I got from Basen. Then it started to oscillate at ~4% range. The reason of course was that the BMS parameters were weird. Their default values seem decent and match my MB31 cells, but the actual values when read from BMS were off by a lot (weirdly high under voltage alarm in comparison to setpoints, same for over voltage). After I saved those parameters manually to proper ones the battery is now behaving nicely with a discharge to 0% meaning around 2.8V and 100% is 3.55V, which is well within the 2.5V-3.65V for the cell. I guess I won't push it beyond that.

Haven't had too many cycles yet after I reconfigured the BMS parameters so can only report after a week on how this progresses.

 

[altenergy21]

Two BasenGreen 48V 314Ah installed tonight in parallel with 3x64V 100AH EG4 LL
18kPV

BMS is "Titanpower". Haven't attempted to have closed loop comm with 18kPV yet.

Active balancing, working great, installation was not bad. Very heavy, three guys moving them into place.

 

[altenergy21]

So sorry for not posting sooner, was busy travelling a lot in the last month. So I got the units, assmbled them and got them into use. The manual is a bit crap, but they also had a video so two combined I was able to build it up. In my unit it also has an active balancer so I think there are different versions out there and it also has I think a proper cells placement as all busbars are the same length. I've added pics from during assembly.

The default settings of course were a bit crap. First off when trying to discharge below 20% it started to oscillate around 16% range. That was cured by a firmware update I got from Basen. Then it started to oscillate at ~4% range. The reason of course was that the BMS parameters were weird. Their default values seem decent and match my MB31 cells, but the actual values when read from BMS were off by a lot (weirdly high under voltage alarm in comparison to setpoints, same for over voltage). After I saved those parameters manually to proper ones the battery is now behaving nicely with a discharge to 0% meaning around 2.8V and 100% is 3.55V, which is well within the 2.5V-3.65V for the cell. I guess I won't push it beyond that.

Haven't had too many cycles yet after I reconfigured the BMS parameters so can only report after a week on how this progresses.

Someone said don't stand them up like that. The bottom batteries will get too much weight on them.

 

[toruonu]

Someone said don't stand them up like that. The bottom batteries will get too much weight on them.

Well I asked from basen and they confirmed that it is ok to install this way.

 

[altenergy21]

Yeah, I guess each cell is 5lbs or about so the bottom one got 35lbs over the entire area so not too bad.

 

[toruonu]

Also the cells are recommended to have compression somewhat The case wasn't as tight as I had assumed. As the batteries came also with the same isolator as the case I put the isolators double, only then did I get any kind of compression when attaching the front. Otherwise the batteries were somewhat free to move.

 

[bigbadjoe]

I have an off the grid system with a 12kW Sol Ark inverter, solar panels, and a battery bank. I just assembled this DIY from Basengreen, I want to add it to my system . I wired it up in parallel with my older battery bank. I'm getting an error. Any advice? Thanks.

 

[TedK]

I have an off the grid system with a 12kW Sol Ark inverter, solar panels, and a battery bank. I just assembled this DIY from Basengreen, I want to add it to my system . I wired it up in parallel with my older battery bank. I'm getting an error. Any advice? Thanks.

I also have a Sol Ark 12K with 6 AG4 batteries, I added a 15K Basengreen, all batteries are open loop, so far the Basengreen balancing works good, but the VOC is way off sometimes, Sol Ark and AG4 agrees on VOC but usually Basengreen is 20% or more off of what Sol Ark and AG4 show. For that reason I will not connect it to Sol Ark unless they fix the VOC with software updates.
In terms of support, I ordered a 2nd battery kit with cells, the balancing circuit had a bulging electrolytic cap for the last couple of weeks I try to resolve that, initially I was told this board is not part of the kit when I show them the picture I was told that I misswired the system which I did not.
I am planning to get 10 more battery kits with cells for friends and neighbors but it will not be Basengreen especially with the support they have.

 

[altenergy21]

I also have a Sol Ark 12K with 6 AG4 batteries, I added a 15K Basengreen, all batteries are open loop, so far the Basengreen balancing works good, but the VOC is way off sometimes, Sol Ark and AG4 agrees on VOC but usually Basengreen is 20% or more off of what Sol Ark and AG4 show. For that reason I will not connect it to Sol Ark unless they fix the VOC with software updates.
In terms of support, I ordered a 2nd battery kit with cells, the balancing circuit had a bulging electrolytic cap for the last couple of weeks I try to resolve that, initially I was told this board is not part of the kit when I show them the picture I was told that I misswired the system which I did not.
I am planning to get 10 more battery kits with cells for friends and neighbors but it will not be Basengreen especially with the support they have.

Where are you thinking buying from next?

I think I still want Basengreen cases and get the batteries elsewhere. I hear about Amy Wan (search forum for her) but I don't think her store has 314Ah batteries right now.

Two of my DIY Basengreen have been working for a few days now. I guess I'm lucky.

Have you see this dude https://jag35.com/

He has 314Ah, for 32 cells and factoring the cases, it would be $1k higher than from Basengreen.

 

[TedK]

Where are you thinking buying from next?

I think I still want Basengreen cases and get the batteries elsewhere. I hear about Amy Wan (search forum for her) but I don't think her store has 314Ah batteries right now.

Two of my DIY Basengreen have been working for a few days now. I guess I'm lucky.

Have you see this dude https://jag35.com/

He has 314Ah, for 32 cells and factoring the cases, it would be $1k higher than from Basengreen.

I already ordered one unit from https://www.alibaba.com/product-det...a2756.order-detail-ta-ta-b.0.0.2d552fc20iXpYB with 302 cells, the cost came a bit lower than Basengreen. It has a JK BMS and a few more features than Basengreen.

 

[Gregorypaolini]

I've got 3 of the Basen Green DIY's hooked up to my two EG4 18kpv inverters.
All open loop communication... Can't get the closed loop to work yet..

Anyway, I'm not sure if it's an EG4 thing or a Novice Greg thing, but the batteries are showing 0% SOC on their displays when I get down to 50 volts on the inverter's displays...
I know that I'm using the full 43000+/- watts - So they really are getting down there...

I've been charting it for a couple days - And comparing the voltage reading on the Battery display to the inverter display - Voltages are about the same...

Something I'm overlooking or ignorant to?

 

[altenergy21]

I've got 3 of the Basen Green DIY's hooked up to my two EG4 18kpv inverters.
All open loop communication... Can't get the closed loop to work yet..

Anyway, I'm not sure if it's an EG4 thing or a Novice Greg thing, but the batteries are showing 0% SOC on their displays when I get down to 50 volts on the inverter's displays...
I know that I'm using the full 43000+/- watts - So they really are getting down there...

I've been charting it for a couple days - And comparing the voltage reading on the Battery display to the inverter display - Voltages are about the same...

Something I'm overlooking or ignorant to?

Well that sucks.
Maybe replace all BMS with a brand that works. I'm on open loop comm too. I got tired of trying to get 18kPV to talk to my EG4-LL

 

[Gregorypaolini]

I'll check with Basen Green to see if I flubbed somthing up... Maybe a firmware update or something????

 

[Gregorypaolini]

Did finally get my Basen Green batteries to communicate with my paralleled EG4 18kpv's, and I ordered 3 more batteries

Anyway, here's a link to the thread where I cover what I did (and didn't do) to get them talking - In case this can help someone else

Thread 'BMS For Closed Loop Communication W/ EG4 18kPV Inverter'

Nov 7, 2024

Hello everyone! I have an EG4 18kPV, and will be building my own LiFePO4 battery pack. I'd like to utilize closed loop communication between the inverter and batteries, so I'm trying to figure out what BMS would work best. EG4 has a matrix of supported battery packs, but these are all pre-built batteries, that do not specify the BMS used.

Can anyone recommend a BMS that will work well for closed loop communication with the EG4 18kPV inverter? I reached out to support, but they will not recommend any specific BMS. I don't need a recommendation, just any input on a BMS that does...

• SolarHobbyist
• Replies: 23
• Forum: BMS (Battery Managment Systems)