Hi Lee and All, While I agree on most cells, experience in the Volt/LG
modules says it can be viable if kept within spec and for 2.5 yrs mine have
stayed within $.01vdc cell to cell says it's alright financially.First they
cost similar to lead but as lighter you need 30% less Kwh.Next the BMSs
available are not reliable and can double costs so adding them likely would
increase danger, not cut it.I've heard of 100s of BMS failures killing modules,
packs but no Volt Module failures without them. None of my 8? customers have
reported problems. Just by not going over 4.12/vpc and not under 3.2vpc plus a
Batt Bridge to alert on any bad connection or imbalance along with every 3
months checking for balance you can have lithium lightweight, performance at
the cost of lead and likely much more life.Just for checking voltages and if
needed which I've never had to do, balance manually.And there are 100s if not
1,000s of people doing this now judging by how hard it is to get Volt packs in
Florida now as I have customers waiting.I just hope my NIB Bolt 2020 US made
modules in my S-10 conversion upgrade work as well. At brand new they are
sitting within .02/vdc between all cells. I'll report when I get 6 months in on
them or iif they get out of balance.Jerry Dycus
On Saturday, March 6, 2021, 10:28:11 AM PST, Lee Hart via EV
<[email protected]> wrote:
Alan Arrison wrote:
>> You've heard it before, but here it is again.
>>
>> Proceed without a BMS at your own peril.
>>
>> Best case, you ruin some expensive cells.
>>
>> Worst case, you burn your house down.
I agree completely. Running lithiums without a BMS is like running your
house wiring without circuit breakers or fuses. When things work,
everything is fine. Look at all the money you saved!
But if/when something goes wrong, your house burns down.
Consider: You are going to use your lithiums until they die. And *when*
they die, one of their failure modes is *fire*.
It's nice if a BMS can prolong battery life, or give you lots of fancy
displays and blinkin-lights. But its most fundamental job is to prevent
a fire.
Lee Hart
--
There is a computer disease that anybody who works with computers knows
about. It's very serious, and interferes completely with your work. The
trouble with computers is that you 'play' with them! (Richard Feynman)
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
--
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