I didn't top balance my packs before installing

[Joeboy]

I did wonder if something along these lines pegged for 16S and it's lower voltage over my 15S setup would get it done?

https://www.amazon.co.uk/QDD-Charger-Li ... 51&sr=8-21

[Joeboy]

Cheers Andy,
Understood. I am vaguely looking about for 230Vac to 48/52Vdc charger. Somewhere around 8A so I can augment my overnight charging or take from the EV to the homestack

I'm using the Eltek for that. But it's a bit more work setting up as you'll need to program a controller. I spoke to Fogstar about this one for the same reason. I can't charge my stack in the 7 hour window at the moment. 1.6kW which should work with the car or a small generator.

https://www.fogstar.co.uk/products/life ... d4a8&_ss=r

Its on back order

Matthew (Fogstar Ltd)
12 Nov 2024, 12:23 GMT

Good afternoon,

Thank you for getting in touch.
I can confirm that we will be stocking more of these chargers however we are looking at lead time of around 8-10 weeks. Apologies for this.

Kind regards,
Matthew

I was offered an Eltek but it was outwith of my happy place for simple folk.

I saw the fogstar just today, that's pretty close to my req's (simple).

[Andy]

Or this one for similar price..60V 20 Amps. https://www.aliexpress.com/item/1005001 ... Redirect=y
Its got adjustable current and voltage though.

[NoraBatty]

Or this one for similar price..60V 20 Amps. https://www.aliexpress.com/item/1005001 ... Redirect=y
Its got adjustable current and voltage though.

They do a 60V 50A one.
https://www.aliexpress.com/item/1005003 ... Redirect=y
The fogstars made more sense to me though, so i preordered 2.

[Joeboy]

Or this one for similar price..60V 20 Amps. https://www.aliexpress.com/item/1005001 ... Redirect=y
Its got adjustable current and voltage though.

They do a 60V 50A one.
https://www.aliexpress.com/item/1005003 ... Redirect=y
The fogstars made more sense to me though, so i preordered 2.

Any idea of what these top out at on V Nora? The Fogstars I mean?

[NoraBatty]

Sadly no, not yet. Im awaiting shipment (mid jan).
They were recommended to me on here by someone else though so maybe whoever that was can fill in some blanks.

Dangerous to presume, but i would think fogstar know who they are marketing to, so i would expect 58V, for a 48V system.
Like you this will be for a top up.
All plans have changed here again re the hybrid install, so i may not need these at all after install, or may be totally reliant on them, but do need to charge the pack up before whatever happens.

[Joeboy]

Sadly no, not yet. Im awaiting shipment (mid jan).
They were recommended to me on here by someone else though so maybe whoever that was can fill in some blanks.

Dangerous to presume, but i would think fogstar know who they are marketing to, so i would expect 58V, for a 48V system.
Like you this will be for a top up.
All plans have changed here again re the hybrid install, so i may not need these at all after install, or may be totally reliant on them, but do need to charge the pack up before whatever happens.

Fair enough, I would like to find a product I could limit to sub 54Vdc for a 15S pack. For some reason and it's not rational. I just don't fancy gear that looks like lab power supplies. Not in my home anyway. Makes no sense tbh! What ye changing in your setup then?

[NoraBatty]

Sadly no, not yet. Im awaiting shipment (mid jan).
They were recommended to me on here by someone else though so maybe whoever that was can fill in some blanks.

Dangerous to presume, but i would think fogstar know who they are marketing to, so i would expect 58V, for a 48V system.
Like you this will be for a top up.
All plans have changed here again re the hybrid install, so i may not need these at all after install, or may be totally reliant on them, but do need to charge the pack up before whatever happens.

Fair enough, I would like to find a product I could limit to sub 54Vdc for a 15S pack. For some reason and it's not rational. I just don't fancy gear that looks like lab power supplies. Not in my home anyway. Makes no sense tbh! What ye changing in your setup then?

I totally get that. Very easy for dials to be knocked to wrong settings too, unless well covered and protected/checked each day. Im sure fogstar can help with the answer if no one here knows.
Install,
I dont want to derail the thread so will onpy say this.
We are formulating darstardly plans currently, that get us over the line and using the stack by feburary instead of waiting the estimated 4-6months for DNO.
In july DNO waits were apparently 1 month. They are now 4-6months.
Granted alot has gone on, but it doesnt seem to bother anyone other than us, that along with extra costs due to an awful install, this whole remedial work thing has the potential to of held up my hybrid install by 1 entire year.
So its not only extra cost from awful efficiency and lost solar gains, but higher electricity prices paid for 1 year where the tech was on site but unuseable, which could have lowered costs by 75%.
Ant they still have not finished their work! So even if the spark was good to go, he cant, until its all signed off. il let you know.

[Andy]

Finally finished charging Joe's cell to full and added it into the pack so I have 5 full packs again.

I have three packs that are really not balancing at all by the looks of it. Interestingly the cells which are running low go slightly high when charging generally but in the float stage are low. So there is an equal amount of time spent charging and discharging. I've increased the delta before activating balance to see if it makes a difference.

The dashed blue line is where it used to start balancing. I've now set it to .025V delta to see if that improves things.
Yellow line at the bottom is the delta.

[Joeboy]

Finally finished charging Joe's cell to full and added it into the pack so I have 5 full packs again.

I have three packs that are really not balancing at all by the looks of it. Interestingly the cells which are running low go slightly high when charging generally but in the float stage are low. So there is an equal amount of time spent charging and discharging. I've increased the delta before activating balance to see if it makes a difference.

The dashed blue line is where it used to start balancing. I've now set it to .025V delta to see if that improves things.
Yellow line at the bottom is the delta.