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Cell monitor
#1
Hi all. Quick question. Without going a full bms route can anyone recommend a cell monitor product that:

-7S
-draws its power from the full pack
-low idle current
-audible warning on cells above or below threshold
-robust

Ta.

BTW Heres a pic of the build. 7S36P NCR18650PF

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#2
You could use a LiPo alarm. They are often used in RC devices.

However for a pack of that size, I would defiantly use a proper BMS. Even if it was a cheap Chinese smart BMS. You really don't want to over charge a pack of that size. Even one 18650 can make quite a bang.
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#3
(03-08-2019, 02:15 AM)Geek Wrote: However for a pack of that size, I would defiantly use a proper BMS. Even if it was a cheap Chinese smart BMS. You really don't want to over charge a pack of that size. Even one 18650 can make quite a bang.

Agreed. Im just waiting for Electrodacus's next batch of integrated solar charger/BMS to ship in April/May.

My concern about cheap chineses BMS is they are often more of a liabilty than a help. Perhaps thats changed since last i looked.
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#4
(03-08-2019, 03:40 AM)zoneblue Wrote:
(03-08-2019, 02:15 AM)Geek Wrote: However for a pack of that size, I would defiantly use a proper BMS. Even if it was a cheap Chinese smart BMS. You really don't want to over charge a pack of that size. Even one 18650 can make quite a bang.

Agreed. Im just waiting for Electrodacus's next batch of integrated solar charger/BMS to ship in April/May.

My concern about cheap chineses BMS is they are often more of a liabilty than a help. Perhaps thats changed since last i looked.

Daromer did a review of a 14s modal. Link
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#5
+1 on the Lipo Alarm. I use it on my lawnmower battery instead of a BMS and it works great! Very low current draw. Only thing is the lipo alarm only works for discharge, so you would still need another product to monitor charging voltages, unless you use an RC charger with balance loads.

Btw, nice pack! Did you spot weld first and then solder the fuses on the bent nickel strips? Or did you leave nickel strips on from cell recovery? I'm talking about the positive side. Just curious as that's pretty ingenious and I wish I thought of that.
DCkiwi likes this post
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#6
Simpler than this is hard to find
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#7
(03-08-2019, 06:37 AM)daromer Wrote: Simpler than this is hard to find

any for 10 s ?
1 kWp in Test
4 kWh battery target - plus Mobile Home battery
Ultra low cost
Electronics ? No clue. Am machinery engineer.
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#8
Cherry: Use 2. THey dont check total voltage on the larm function anyways.
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
Reply
#9
(03-08-2019, 06:37 AM)daromer Wrote: Simpler than this is hard to find

Yeah, that's the one. For 10S, just hook up 2 5S balance leads to 2 of those lipo alarms.
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#10
(03-08-2019, 02:14 PM)daromer Wrote: Cherry: Use 2. THey dont check total voltage on the larm function anyways.

Pulling your leg: Impossible ! Big Grin Big Grin
1 kWp in Test
4 kWh battery target - plus Mobile Home battery
Ultra low cost
Electronics ? No clue. Am machinery engineer.
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