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StirCrazy

Kamloops, BC, Canada

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Posted: 05/25/22 09:11am Link  |  Print  |  Notify Moderator

pianotuna wrote:

Every extra connection causes some additional resistance and a possible failure point.


that is true, but when talking one battery or 4 that isnt much of a difference, the only extra contection is the jumpers bettwen the batteris themselves. heavy wires and good bolts... not much of a risk.


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BFL13

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Posted: 05/25/22 10:49am Link  |  Print  |  Notify Moderator

StirCrazy wrote:

pianotuna wrote:

Every extra connection causes some additional resistance and a possible failure point.


that is true, but when talking one battery or 4 that isnt much of a difference, the only extra contection is the jumpers bettwen the batteris themselves. heavy wires and good bolts... not much of a risk.


Would having fewer BMSs that need to work together be an advantage, or even from having fewer BMSs as possible failure points-- that was mentioned with some lower priced LFPs---saw that somewhere. Might have got it wrong.


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3 tons

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Posted: 05/25/22 12:09pm Link  |  Print  |  Notify Moderator

BFL said: “Would having fewer BMSs that need to work together be an advantage, or even from having fewer BMSs as possible failure points-- that was mentioned with some lower priced LFPs---saw that somewhere. Might have got it wrong. ”

Theoretically correct, and practically as well, SolaCity references this BMS failure possibility whereby too large of inverter and current draw on a marginally-sized battery set-up, but in my view this points more to component mis-matching rather than a ubiquitous BMS problem…Thus, I would not anticipate a problem (nor am aware of one…) so long as one does not exceed a LFP’s (whatever vendors) rated current specs, though (par for the course!), there’s something to be said for choosing quality batteries (or separate components) from a known reputable supplier, in that I consider warranty and real time tech support are of a substantial value…Everything here of course, JMHO

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StirCrazy

Kamloops, BC, Canada

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Posted: 05/25/22 06:50pm Link  |  Print  |  Notify Moderator

BFL13 wrote:

StirCrazy wrote:

pianotuna wrote:

Every extra connection causes some additional resistance and a possible failure point.


that is true, but when talking one battery or 4 that isnt much of a difference, the only extra contection is the jumpers bettwen the batteris themselves. heavy wires and good bolts... not much of a risk.


Would having fewer BMSs that need to work together be an advantage, or even from having fewer BMSs as possible failure points-- that was mentioned with some lower priced LFPs---saw that somewhere. Might have got it wrong.



there is a lot of misconseption out there that BMS control the power of a battery, they don't they are normaly in apassive state just monitoring the power coming in and out of the battery then if it hits a limit they do something. or when the battery is full they ballance the cells if that is a feature of your BMS. if your operating in there range then no as they would just be pasive at that point not controling anything but monitering. it is not the normal way for a BMS to fail. when you are operating around the limits of their capability, that is when they would fail so if you plan on having a 110amp draw, I would much rather have two 100 watt batteries with 100amp bms than one 200 watt battery with a 150 watt BMS, or better yet four 100amp batteries all sporting 100amp BMS.

of course there are always exceptions and maybe a cheep BMS would have a higher degree of componant failure and so on, but a lot of cheep ones are just unbranded copys of the good ones using the same exact parts. I think the biggest failure rate I saw was when they started intagrating bluetooth monitoring into the BMS.

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pianotuna

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Posted: 05/25/22 07:59pm Link  |  Print  |  Notify Moderator

Small resistance numbers may make dramatic differences.

It is an advantage to have fewer battery management systems.

For example. One battery at 20% state of charge, and another at 80%. (Yes, I know that is not usual). The BMS in the 80% will shut down first, leaving the other battery only partly charged.

The solution is to charge them separately.

This is NOT my opinion.

If requested I'll post a link about what happens.


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StirCrazy

Kamloops, BC, Canada

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Posted: 05/26/22 06:40pm Link  |  Print  |  Notify Moderator

pianotuna wrote:

Small resistance numbers may make dramatic differences.

It is an advantage to have fewer battery management systems.

For example. One battery at 20% state of charge, and another at 80%. (Yes, I know that is not usual). The BMS in the 80% will shut down first, leaving the other battery only partly charged.



no it wont shut down both batteries, the BMS in one battery doesnt magicly shut down the other ones and it definatly isnt going to shut down a battery at 80% the BMS is not a controler as you see it, it is a monitor with a out of range protection. so it doesnt control charging (well if you have an active balancing feature built in it will control that only) but as far as charging goes each batteries BMS will only monitor that battery. as charging happens if one hits a charg limit it will shut down that battery and the other will keep charging, but if you hit that limit before the other are charged that is another issue all togeather,as in you shouldnt be allowed to wire batteries togeather no mater what type they are.

you theory about little resistance differences applied to every battery type, and thats why when we conect batterys we use larger than required cables and arange them in methods that give you the same lenghts of cables so resistance from cables and the conections are the same. well most of us do, I have seen some pretty ugle battery jobs...

you spout off numbers that are for different chemistries, you make issues that apply to every battery type sound like there unique to Li. it almost makes it seam like the SiO2 dealer is paying you , but we know that isnt true or you would actualy have that kinda battery.

BFL13

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Posted: 05/26/22 07:07pm Link  |  Print  |  Notify Moderator

OP here, time for Mods to close this thread.

PerryB67

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Posted: 05/29/22 07:40pm Link  |  Print  |  Notify Moderator

BFL13 wrote:

OP here, time for Mods to close this thread.
Having used SiO2 for the past 1 1/2 years, but not being on this forum for the past few months, I’m sad that it may be closed. Just got home and was hoping to discuss our actual SiO2 user experiences. There is some BS that was not caught posted here too.

Oh, well.

Perry


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Y-Guy

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Posted: 05/30/22 08:55pm Link  |  Print  |  Notify Moderator

Thread in on a time out for the time being.

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