Re: Re: [Makers] 7S charger

39 views
Skip to first unread message

Glen Beestone

unread,
Mar 19, 2021, 10:07:57 AM3/19/21
to North East Makers
Thanks but its a fixed current charger and doesn't do balanced charging. I.e
Looks at the state of each cell (or pack of paralleled cells) to ensure it's not developing a voltage difference from the other cells in the pack.

This charger will be for charging a pack that (hopefully) would already have have a battery management/balance controller built into it, as found in ebikes

I was more after a recommendation from somebody that might have such a thing and could see it from experience whether it is worth buying

Glen


--
Sent from my Android phone with mail.com Mail. Please excuse my brevity.
On 19/03/2021, 12:57 John L Scott <jok...@gmail.com> wrote:

On Fri, 19 Mar 2021 at 11:30, Glen Beestone <gl...@technologist.com> wrote:
Can anyone recommend a charger that can balance charge a 7S Li-ion battery pack.


I have a turnigy accucell 6, but it will only balance charge 6sS packs maximum.


Something cheap as possible
it will not get a great deal of use. It will be used to occasionally check and balance out 24 volt packs from a DIY "powerwall" which will get their regular charge from a solar MPPT charge controller.

So this unit will just be for charging up new packs to go into the system and periodic "maintenance" on existing packs

Glen


--
Sent from my Android phone with mail.com Mail. Please excuse my brevity.

--
You received this message because you are subscribed to the Google Groups "North East Makers" group.
To unsubscribe from this group and stop receiving emails from it, send an email to north-east-mak...@googlegroups.com.
To view this discussion on the web, visit https://groups.google.com/d/msgid/north-east-makers/trinity-5f77f1d4-fb79-438c-866c-1c409b445ed0-1616153452833%40msvc-mesg-gmxus007.

--
You received this message because you are subscribed to the Google Groups "North East Makers" group.
To unsubscribe from this group and stop receiving emails from it, send an email to north-east-mak...@googlegroups.com.
To view this discussion on the web, visit https://groups.google.com/d/msgid/north-east-makers/CAJGf0UGu11oncrnXuRSYbSZn7SW4Hvepn1WP-nqveaPj9MzPDQ%40mail.gmail.com.

Glen Beestone

unread,
Mar 20, 2021, 10:11:00 AM3/20/21
to North East Makers
Indivudual 7S3P packs as plug in storage for a "24 volt" solar system


At the moment I'm in two minds as to whether to put BMS boards in every pack (could get expensive ) or simply have balance leads comimg from every pack into a monitorimg system.

Eith the layter sysyen i spy one pack getting out of tolerance I can pull it and charge it on a separate balance system and if it won't balance properly then rebuild or replace as necessary.

Whichever way I go I need something that can handle 7s just to help me build the packs together. I can balance charge all of the cells needed for a pack in a test rig and eliminate any problems before they all get spot welded together


Glen







Glen





--
Sent from my Android phone with mail.com Mail. Please excuse my brevity.
On 20/03/2021, 13:46 Dan Nixon <danns...@gmail.com> wrote:
What is the battery for?

I often see the combination of BMS and active balancer used for larger cell counts (e.g. those used in EV and bulk storage).
Perhaps this might be appropriate?

I couldn't really offer any recommendations, but this type of hardware comes up quite a bit on https://www.youtube.com/channel/UCXJ7onrDcxo2zy8yAsxqwgg where some specific hardware and general installation/operation is shown.

Dan

On Friday, 19 March 2021 at 14:24:13 UTC Woody wrote:
Hi Everyone,
PSA: Glen mentions that the charger needs to balance the cells.  The type of charger needs to be one that has a cell balancing lead as well as a main charging lead. (Typically referred to as a 'smart charger').

Hi Glen,
As an alternative (some might perceive as sketchy, but I think you're game! :)), how about making up a 6S charge & balance lead for your battery, balance the first 6, then make another lead for the 7th cell and charge it individually on 1S?

On Fri, 19 Mar 2021 at 12:57, John L Scott <jok...@gmail.com> wrote:

On Fri, 19 Mar 2021 at 11:30, Glen Beestone <gl...@technologist.com> wrote:
Can anyone recommend a charger that can balance charge a 7S Li-ion battery pack.


I have a turnigy accucell 6, but it will only balance charge 6sS packs maximum.


Something cheap as possible
it will not get a great deal of use. It will be used to occasionally check and balance out 24 volt packs from a DIY "powerwall" which will get their regular charge from a solar MPPT charge controller.

So this unit will just be for charging up new packs to go into the system and periodic "maintenance" on existing packs

Glen


--
Sent from my Android phone with mail.com Mail. Please excuse my brevity.

--
You received this message because you are subscribed to the Google Groups "North East Makers" group.
To unsubscribe from this group and stop receiving emails from it, send an email to north-east-mak...@googlegroups.com.
To view this discussion on the web, visit https://groups.google.com/d/msgid/north-east-makers/trinity-5f77f1d4-fb79-438c-866c-1c409b445ed0-1616153452833%40msvc-mesg-gmxus007.

--
You received this message because you are subscribed to the Google Groups "North East Makers" group.
To unsubscribe from this group and stop receiving emails from it, send an email to north-east-mak...@googlegroups.com.
To view this discussion on the web, visit https://groups.google.com/d/msgid/north-east-makers/CAJGf0UGu11oncrnXuRSYbSZn7SW4Hvepn1WP-nqveaPj9MzPDQ%40mail.gmail.com.

--
You received this message because you are subscribed to the Google Groups "North East Makers" group.
To unsubscribe from this group and stop receiving emails from it, send an email to north-east-mak...@googlegroups.com.
Reply all
Reply to author
Forward
0 new messages