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2x BMS on one 7S pack with relay i/o mosfets for current.
#1
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Hey Guys,

How do you think about that set up:

1. BMS that will active ballance battery like ISDT BG-8S or this BMS 1A ballance with bluetooth
2. PCM that will only work as protection circut that cuts load/charger whenever voltage will pass certain level.
2a. will only engage or disengage an relay that pass the main current to battery. (and if any of cell will pass a certain level low or high, will shut off the load/charger)
2b. End voltages could be fully programable - top tier reg. quality (but not pricy as batrium setup)

I do have 7S1P 60Ah SDI cell setup to ballance + 3kW AIMS inverter.
Spot Welder - Mactronic V3.3
Battery - ~7S1P 60Ah SAMSUNG SDI prismatic cell - I'm looking for more info about them  Huh
BMS - bluetooth 1A active balancing
Inverter - 3kW AIMS  pure sine
Solar - considering addding 220W with MPPT Make Sky Blue 30A
Set up for mobile gastronomy 2kW cooling compressor + 500W appliancies

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#2
I think it's best to buy a proper BMS rather than a Chinese "BMS" board that will most likely create more problems over time than it will protect you from.
Korishan and Headrc like this post
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#3
Will work but the bms alone is most likely a simpler sollution.
Most likely more costeffective too including the energy Lost for balancing
Korishan and Headrc like this post
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#4
(06-26-2019, 02:26 PM)mike Wrote: I think it's best to buy a proper BMS rather than a Chinese "BMS" board that will most likely create more problems over time than it will protect you from.

You are right, I'll rather to keep it simple as well, but good BMS that can handle surge current of ~1000A cost more then my batteries...

@daromer

How about the simple and relayable BMS with 1A balancing (don't need more, it's simple setup with no parralel cells that I will ballance with charger if needed) and programmable relay cut off ?
Spot Welder - Mactronic V3.3
Battery - ~7S1P 60Ah SAMSUNG SDI prismatic cell - I'm looking for more info about them  Huh
BMS - bluetooth 1A active balancing
Inverter - 3kW AIMS  pure sine
Solar - considering addding 220W with MPPT Make Sky Blue 30A
Set up for mobile gastronomy 2kW cooling compressor + 500W appliancies

Reply
#5
chargery bms8t (cost me 86 dollars 3 months ago) is a very good bms that can balance at 1.2 amps. I use it on my 220ah 4s lifepo4, but it can do up to an 8s battery pack. All the voltage upper/lower are fully programmable. The one I bought came with a 100 amp shunt but you can add a higher amp one. Since this bms uses contactors instead of mosfets to control charging/discharging, you can handle as many amps as your contactor can handle. I been using a 30 amp automotive relay (4 dollars) as a contactor. 

I been using this bms for almost 2 months on my solar system and has been working extremely well. Only drawback is that its not a small compact bms. But the price is definitely good for what it can do.
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#6
(06-27-2019, 08:23 AM)Issac Wrote:
(06-26-2019, 02:26 PM)mike Wrote: I think it's best to buy a proper BMS rather than a Chinese "BMS" board that will most likely create more problems over time than it will protect you from.

You are right, I'll rather to keep it simple as well, but good BMS that can handle surge current of ~1000A cost more then my batteries...
Then get a remote trip breaker that will handle the 1000A, and use the BMS to trip it on an out-of-voltage condition.
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#7
(06-28-2019, 05:41 PM)jonyjoe505 Wrote: chargery bms8t (cost me 86 dollars 3 months ago) is a very good bms that can balance at 1.2 amps. I use it on my 220ah 4s lifepo4, but it can do up to an 8s battery pack. All the voltage upper/lower are fully programmable. The one I bought came with a 100 amp shunt but you can add a higher amp one. Since this bms uses contactors instead of mosfets to control charging/discharging, you can handle as many amps as your contactor can handle. I been using a 30 amp automotive relay (4 dollars) as a contactor. 

I been using this bms for almost 2 months on my solar system and has been working extremely well. Only drawback is that its not a small compact bms. But the price is definitely good for what it can do.

Thank you, I've been thinking about this one, and now I'm convinced  Big Grin
I'm looking localy avalible good relay that can handle continuous of 100-150A - not easy with limited $$$.
Spot Welder - Mactronic V3.3
Battery - ~7S1P 60Ah SAMSUNG SDI prismatic cell - I'm looking for more info about them  Huh
BMS - bluetooth 1A active balancing
Inverter - 3kW AIMS  pure sine
Solar - considering addding 220W with MPPT Make Sky Blue 30A
Set up for mobile gastronomy 2kW cooling compressor + 500W appliancies

Reply


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