Shawn Hayes
Learning Everyday
I checked settings, temps settings, etc.. nothing seems off?
Help with 128 batteries each one is 280ah, and want to configure for 48v system.
- Thread starter kromc5
- Start date
The only thing I found was if I made changes and forgot to sync the bypass would fail. I will take a few screenshots in the toolkit for comparison and upload tomorrow. I did enable multi-string so a few of the functions will be different.
I combined both banks this evening.
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Shawn Hayes
Learning Everyday
Very nice! Thanks, I'm giving it another try in the am...thanks for the info.
You could try lowering the amps to something under 1.7 or less then try it again.
Shawn Hayes
Learning Everyday
Finally got bypass test to pass. Had to uninstall software, reinstalled and setup process again. Passed.
@kromc5 did you finally figure out why you had rogue or runaway cells?
I was not able to determine why but I have both banks of 4p16s connected together and running 1/2 the house again.
If I had to guess prior it was not using any float. I'm still conflicted on float, prior I had it disabled. It's currently starts to float at 53.74. Before during charge and discharge they started to deviate little by little. During the charge they would charge to around .3v of each other but then deviate faster on discharge. It has only been two days but both banks have only deviated by .1v.
Here's what I did to try and make sure all 128 batteries were at close as possible:
Very new to solar but started purchasing items, not sure of the final specs of the whole system.
Middle bank was 53.28, Top bank was at 53.97. Since the soc was similar with just slightly higher voltage I did not expect to many amps. I did connect using two wires with 30 amp fuses just incase. What were the measure amps? Max I recorded was 22.9, dropping to 6.13 in about 8 minutes.
diysolarforum.com
Shawn Hayes
Learning Everyday
Good deal. I was curious because I don’t remember seeing or hearing a final resolution to the problem that you have posted.I was not able to determine why but I have both banks of 4p16s connected together and running 1/2 the house again.
If I had to guess prior it was not using any float. I'm still conflicted on float, prior I had it disabled. It's currently starts to float at 53.74. Before during charge and discharge they started to deviate little by little. During the charge they would charge to around .3v of each other but then deviate faster on discharge. It has only been two days but both banks have only deviated by .1v.
Here's what I did to try and make sure all 128 batteries were at close as possible:
Very new to solar but started purchasing items, not sure of the final specs of the whole system.
Middle bank was 53.28, Top bank was at 53.97. Since the soc was similar with just slightly higher voltage I did not expect to many amps. I did connect using two wires with 30 amp fuses just incase. What were the measure amps? Max I recorded was 22.9, dropping to 6.13 in about 8 minutes.
I ended up changing my set up to a 16s4p. It was a little more expensive that way because I ended up buying 64 Blockmons, one for each cell and only using one Batrium.
Do not have my packs in parallel yet, waiting on the last two packs to settle down a little bit before paralleling.
I will post some pictures soon so that you can see what I have got set up. Thanks for the link I will check that out when I have a chance later today.
Definetly post some pictures, with float they are staying very close so far no devation of more than .1v. The seconday affect is the inverter/charge controllers in float take care of the loads. They fluctuate between .1 to .001+/- through out the evening. Also the total kwh production is much higher and the graph is very stable instead the high discharge/charge that it was doing before. Due to the float and low variations I suspect that the soc is also better for the evening before sun down.
Zwy
Photon Sorcerer
Can you provide any info on the 48v to 24v converter used?I used one like this:
ABB BREAKER S5N SACE S5 SACES5 S5N300TDDAS8 300 AMP A 300A 300AMP 3P 3 POLE | eBay
Find many great new & used options and get the best deals for ABB BREAKER S5N SACE S5 SACES5 S5N300TDDAS8 300 AMP A 300A 300AMP 3P 3 POLE at the best online prices at eBay! Free shipping for many products!www.ebay.com
You may have to shop around for one with larger amp rating or use two since you have two inverters. You could easily use two with the batrium (assuming you have the expansion board). You might want to see how your inverters handle being disconnected from the battery while under load.
If you get a shunt trip, make sure it's 24v (or if you can find one that will work with battery voltage). There are a few youtubes on wiring like. I went the route like this guy did with a 48v->24v converter which powers the batrium and provides power for the shunt trip. The Batrium will run on up to 65 v and you can tap your battery for 24v for the shunt, but I didn't know if I would add any other gadgets like fans and 24v is common. So I went with a converter.
Its a ddr-60l-24
www.digikey.com
DDR-60L-24 MEAN WELL USA Inc. | Power Supplies - External/Internal (Off-Board) | DigiKey
Order MEAN WELL USA Inc. DDR-60L-24 (1866-5067-ND) at DigiKey. Check stock and pricing, view product specifications, and order online.
Bleedingblue
Solar Addict
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Bleedingblue
Solar Addict
- Joined
- May 12, 2020
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Maybe he doesn't want to consume less. Maybe he's got a home and a couple work shops to run?
I have a similiar sized battery bank, I wouldn't have gone with the 12k if I was the OP though. I would have went with the 240v 5k inverters with a real transformer not the little mini transformer. I have a 37.5KW transformer and I never have to worry about using this or that. I can run 3- 4.5 ton air-conditioned, appliances, tools, dehumidifiers etc etc etc and never worry about anything shutting down Iike the solarks do.
If it's cloudy and rainy for a couple weeks and your panels are not making jack squat you will be thanking your lucky stars you bought that huge battery pack.
Bleedingblue
Solar Addict
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Think of it like this..... if something happens.. say BMS gives out or a cell or 2 maybe more lets go that pack is down. If you have separate batteries you can shut one or 2 down to do maintenance and still have battery back up. Or cannibalize one pack to make another pack whole again.
Guys are not worry about something catching fire....?
My cells are in a concrete box, I can sleep nicely, I would not with this kind of setup...
Bleedingblue
Solar Addict
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Batteries... fire ... structure made of wood .. catch fire ... OSB .. more fire ... batteries now fall down .... walls on fire .. ? All that while you are asleep ...
Bleedingblue
Solar Addict
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Batteries... fire ... structure made of wood .. catch fire ... OSB .. more fire ... batteries now fall down .... walls on fire .. ? All that while you are asleep ...
One thing I've noticed is your really interested in telling others what they need to be doing with their own stuff. What If i posted a present pic that showed concrete board mounted behind the batteries?
Post pics of your setup
curiouscarbon
Science Penguin
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safety oriented behavior
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Nothing wrong with differing opinions on technical matters (or anything else for that matter) so long as its not overbearing, its how we learn and evolve and either reinforce, question, or modify our own points of view. Its usually not intended to be offensive or aggressive, but often times it gets interpreted that way, particularly online where tone is hard to gauge.
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