Big Battery 24v A123
- Thread starter MrNatural22
- Start date
Have close up photos?
So If I wanted to copy (as will use overkill BMS as well). Seems like it advisable just to buy the adapter from bigbattery and toss the 8-wire part.
Im looking at 600ah so 6 BMS and 6 adapter add a lot to the bottom line.
I pad. $799 including the BMS "
PLUG-AND-PLAY! NO SOLDERING NEEDED!
I thought everything was already assembled. That is what plug and play normally means I think. The BMS and BMS adapter came separately.
Having said that, it may be very easy to assemble. But my initial reaction is disappointment. I have far too many irons in the fire right now.
I hope the bolts for the BMS lugs were included. Have not seem them so far - doesn't look like it.
PLUG-AND-PLAY! NO SOLDERING NEEDED!
I thought everything was already assembled. That is what plug and play normally means I think. The BMS and BMS adapter came separately.
Having said that, it may be very easy to assemble. But my initial reaction is disappointment. I have far too many irons in the fire right now.
I hope the bolts for the BMS lugs were included. Have not seem them so far - doesn't look like it.
traderd65
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With that package, I think this gives the flexibility to place the BMS on top of the battery or on the side. No need for soldering. Plug the supplied 8-wire connector to the battery and BMS. No bolts provided, I got them at home depot (M6 10mm) plus washers and lock washers.
Which all took ~ 1.5 hours since I took no chance on hooking anything up wrong. Good thing I had M6 x 10mm bolts, I am remote as f'k.
26.27V in #1. 26.26V in #2. Or 3.28V/cell - good storage voltage. They had chilled a bit before I dug them out and wired them up. I store them in the 40's until needed. The voltage drain of the vaunted LiFePO4 will be interesting indeed.
I wonder if passive balancing happens 24/7 or only when fully charged?
The newest one costs $100 more. Differences:
1) Circuit breaker instead of fuse.
2) Digital voltage readout.
3) Anderson connector built into box.
I'd say that is all worth $50-$150 depending on priorities. Hopefully they pre-assemble it this time! Finding the right bolts took me 1/2 hour.
1) Circuit breaker instead of fuse.
2) Digital voltage readout.
3) Anderson connector built into box.
I'd say that is all worth $50-$150 depending on priorities. Hopefully they pre-assemble it this time! Finding the right bolts took me 1/2 hour.
johnnyding
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traderd65
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What charger are you using for the A123? Is the BMS providing a control function for the charger?
No.15
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For the a123 batteries I am using a victron ip67 charger. I like that I can "program" it for custom charger profiles. Most of my battery setups now are 24v and I just use this one when I need to charge from grid. I ordered a nice bench power supply and will use that as well for charging, just waiting for it to arrive
traderd65
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Thx for the info. Looks like BigBattery that sells the A123 recommends this charger:
24V 30A DC Charger – BigBattery.com
bigbattery.com
I'm going to try the one recommended by Will:
PD9240-24 Volt Power Converter / Battery Charger
Progressive Dynamics PD9240-24 volt power converter / battery charger for specialty vehicles, applications. Built-in 4-stage charging for battery management.
www.progressivedyn.com
traderd65
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(1) Now that I think about it, my house breakers are all 15A, so either the PD (40A) or YZ (30A) will likely trip the breaker. Hmmm.
(2) Is it better to have the solar panels disconnected while shore power charging, or can I use both at the same time (ie there's no concern of either putting too much power into the system using battery + mppt/scc + charger, and no concern for impact on the mppt/scc itself with the solar input also loaded with the charger output)?
(2) Is it better to have the solar panels disconnected while shore power charging, or can I use both at the same time (ie there's no concern of either putting too much power into the system using battery + mppt/scc + charger, and no concern for impact on the mppt/scc itself with the solar input also loaded with the charger output)?
MrNatural22
?SW sunshine =⚡️⚡️lit up thru the darkness✌️
The charger outputs the rated amps to the battery. It doesn’t draw that from your AC plug. The specs should tell you what it uses as input amps.
Connecting PV and shore at the same time shouldn’t be a problem. Your CC controls that.
traderd65
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Doh, total miss on my side, of course the Amps on the AC side are way lower.
Re CC control of PV and shore power, I assume that means the positive wire from the CC output to the battery is on a different connection from the PV and Charger positive connections (which I understand are shared).
MrNatural22
?SW sunshine =⚡️⚡️lit up thru the darkness✌️
The pos wire from the CC is output from the PV panels. Your CC will taper and reduce charge current as battery becomes full. Your shore charger should do the same.
The CC will not allow the shore chgr or battery back feeding into the PVs.
The CC will not allow the shore chgr or battery back feeding into the PVs.
No.15
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Both of those are good choices. I needed a little more portability and I like how easy it is to customise the victron. I sacrifice some charging power for those features but it works with my planThx for the info. Looks like BigBattery that sells the A123 recommends this charger:
24V 30A DC Charger – BigBattery.com
I'm going to try the one recommended by Will:
PD9240-24 Volt Power Converter / Battery Charger
Progressive Dynamics PD9240-24 volt power converter / battery charger for specialty vehicles, applications. Built-in 4-stage charging for battery management.
Cut off at 3.0 volts - isn't that about 10% SOC? What voltage did you charge them up to?
Assuming that is 10% SOC the Wh is about 2693 with a fairly mild discharge rate of 20A.
What they said:
Nominal Capacity: 2.45kWh (92.8Ah)
Energy – 100% DOD, Nominal: 2.6 kWh
EV Energy – 80% DOD, Nominal: 2.1 kWh
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