captain387
100 W
Just an FYI, the last post on this topic (when it was active) was from 2015
eMark said:,.....,...............
Lesson is not to buy a cheap BMS or a cheap non-adjustable charger. So, why do you need a HV alarm?
lots of members swear these are great:zeccato said:All I care about is the monitor,
and maybe disable the balance
john61ct said:lots of members swear these are great:zeccato said:All I care about is the monitor,
and maybe disable the balance
http://www.chargery.com/BMS16Pro.asp
Other Chargery products, I dunno, but at least the BMS can terminate your PSU when the first cell hits your desired HVC, not just beep at you.
Take my guidance above into account, and read the manual before ordering to check it meets your needs.
jonyjoe303 said:
john61ct said:A relay capable of interrupting the AC input to that Gophert PSU would be so cheap,
it would be silly not to use the BMS to terminate the charge cycle directly rather than just sit there beeping.
"I can't find any bms16 charms can you give a link?"
jonyjoe303 said:"I can't find any bms16 charms can you give a link?"
type this into ebay search and it will come up cost 108, it doesnt come with contactors/relays which isn't needed for monitor use. On mine I use a 4 dollar 30a automotive relay.
BMS16 V2.0 300A 2S - 16S BMS lifepo4 Li-ion LiPo Battery Protection Chargery
You think? You're wrong, that's what we keep telling you over and over.zeccato said:john61ct said:A relay capable of interrupting the AC input to that Gophert PSU would be so cheap,
it would be silly not to use the BMS to terminate the charge cycle directly rather than just sit there beeping.
i think my gophert doesn't need hvc,
when I charge the 16s battery at 54.7v or more,
in the final it goes from c.c. to c.v.
and it automatically lowers the amps, to zero I think.
john61ct said:You think? You're wrong, that's what we keep telling you over and over.zeccato said:john61ct said:A relay capable of interrupting the AC input to that Gophert PSU would be so cheap,
it would be silly not to use the BMS to terminate the charge cycle directly rather than just sit there beeping.
i think my gophert doesn't need hvc,
when I charge the 16s battery at 54.7v or more,
in the final it goes from c.c. to c.v.
and it automatically lowers the amps, to zero I think.
The PSU has no termination logic at all, it is doing no regulation toward the end of the cycle except capping **voltage** only - that voltage is OK BTW.
That is the resistance of the overcharged battery causing amps accepted to fall.
Charge should be stopping at 0.05C or IOW when trailing amps has dropped to a 0.5A rate per 10Ah of bank capacity
or maybe 0.02C but IMO that's too stressful, earlier is better for longevity.
But really a simple HVC is much easier to implement, could increase voltage a bit say 3.55V if doing CC only.
Just allowing overcharge like that is not only bad for the batteries, but risky wrt fires as they get worn out.
zeccato said:john61ct said:You think? You're wrong, that's what we keep telling you over and over.zeccato said:john61ct said:A relay capable of interrupting the AC input to that Gophert PSU would be so cheap,
it would be silly not to use the BMS to terminate the charge cycle directly rather than just sit there beeping.
i think my gophert doesn't need hvc,
when I charge the 16s battery at 54.7v or more,
in the final it goes from c.c. to c.v.
and it automatically lowers the amps, to zero I think.
The PSU has no termination logic at all, it is doing no regulation toward the end of the cycle except capping **voltage** only - that voltage is OK BTW.
That is the resistance of the overcharged battery causing amps accepted to fall.
Charge should be stopping at 0.05C or IOW when trailing amps has dropped to a 0.5A rate per 10Ah of bank capacity
or maybe 0.02C but IMO that's too stressful, earlier is better for longevity.
But really a simple HVC is much easier to implement, could increase voltage a bit say 3.55V if doing CC only.
Just allowing overcharge like that is not only bad for the batteries, but risky wrt fires as they get worn out.
I've never had the overcharge, I maxed out at 3.45v cell (lifepo4),
or maybe I don't understand some of your technical info.
if you can make it easier.
what risk or harm I create if I charge the battery 16s to 3,43v each cell with Gophert c.c c.v.
john61ct said:Ask specific questions to clarify what you don't understand, after googling a bit.
Holding Absorb / CV too long is by definition overcharging even at 3.43Vpc, before you were talking until trailing current drops to 0A!
As stated, consequences include reduced pack longevity, worst case fire, can easily burn down your house.
The proper termination point is not just voltage, the other part is current.
> I set the charge to 5A, and when it drops to 1A, I turn it off.
That is the right concept, aka the endAmps setpoint
but the actual number will vary by how many Ah the pack is
which is why it is spec's as a C-rate, not in amps.
How many Ah is your pack?
zeccato said:john61ct said:You think? You're wrong, that's what we keep telling you over and over.zeccato said:i think my gophert doesn't need hvc,
when I charge the 16s battery at 54.7v or more,
in the final it goes from c.c. to c.v.
and it automatically lowers the amps, to zero I think.
The PSU has no termination logic at all, it is doing no regulation toward the end of the cycle except capping **voltage** only - that voltage is OK BTW.
That is the resistance of the overcharged battery causing amps accepted to fall.
Charge should be stopping at 0.05C or IOW when trailing amps has dropped to a 0.5A rate per 10Ah of bank capacity
or maybe 0.02C but IMO that's too stressful, earlier is better for longevity.
But really a simple HVC is much easier to implement, could increase voltage a bit say 3.55V if doing CC only.
Just allowing overcharge like that is not only bad for the batteries, but risky wrt fires as they get worn out.
I've never had the overcharge, I maxed out at 3.45v cell (lifepo4),
or maybe I don't understand some of your technical info.
if you can make it easier.
what risk or harm I create if I charge the battery 16s to 3,43v each cell with Gophert c.c c.v.
Do what you like, IMO relying on human regulation is too risky.zeccato said:should I stop charging the battery directly (without bms or balance charger) with this Gophert power supply?
c.v is not good without Hvc?
john61ct said:
john61ct said:Sure if the one's output matches what the other needs for input, volts is volts amps is amps
You've previously indicated one reason for overcharge HVA protection (e.g. Gophert relay) when "quick" charging with a bulk charger. Why not just adjust your bulk charger to 4.1V or even 4.0V when "quick" charging ... that way it would take even less time when "quick" charging :thumb:zeccato said:To connect the Gophert to this:
THUNDER POWER RC 1430C DC
charger, discharger and balancer
1000 Watt
0-36.0V input voltage
You've got to be kidding my ES friend.john61ct said:What is HVA protection?
Apparently you weren't doing due diligence while reading previous posts, but not comprehending my EX friend ... opps i meant ES friend :thumb: ... Realize it may be difficult, but i know you've got it in you to keep up and not misinterpret :thumb:john61ct said:Not sure why you are using scare quotes for the word quick.
You do exagggerate my knowledgeable ES friend. Please try to stay on board with closer attention to his explicit posts instead of straying.john61ct said:Especially when balancing is simply not needed, can be many months at a time if not years.
It would be helpful if john would not only read, but grasp the content of your explicit posts so wouldn't be necessary to Xpln 2 Hymzeccato said:To connect the Gophert to this:
THUNDER POWER RC 1430C DC
charger, discharger and balancer
1000 Watt
0-36.0V input voltage