Steve reminded me of something, probably because it is not very common. If you
are recharging at 1C or greater rates, the Absorb cycle will need to be longer
if you want to return all energy to the battery. Example: For a 300AH battery,
1C would be 300 Amps or over 16kW for a 48V bank.
Since i
boB,
Yes, the Absorb timer in the FM and MX determine maximum CV time. From FM
manual:
While the batteries are held at this voltage, the ChgT counter in the Misc
menu counts up from zero toward the user-defined Absorb Time Limit. (See pages
44 and 49.) The charger will exit this stage and ente
Thanks Larry.
The information to stop when absorb voltage was reached is like, 10 or
more years old and so I
don't know if that voltage reach and stop charging algorithm is still
used by any BMS's.
This is probably why we had to add a logic input to tell the controller
to stop charging from
I got a call from a colleague that is designing a very large roughly 90-100 kWh
lithium battery at 48v.
He’s looking for large AC chargers to charge this bank. The reason is total
elimination of switch over delay from inverter to generator and back.
One technique is to use inverters for this,
If you stop charging a Li-ion battery when the CV (absorb voltage) is reached,
you may reduce or stop the needed cell balancing time. We have had customers
develop unbalanced series cells from continuous undercharging. Because of
internal cell resistance, one cell will always reach saturation be
Depends on the requirement for the BMS.
Usually, but not 100% always, the requirement is to get the voltage up
to "absorb" and then stop charging.
Just set the min and max times very low, like 1 minute and that should
satisfy that one.
I do not remember if the MX60 had a Re-Bulk setting
boB,
Interesting...Sounds like this is not a candidate for L-ion
batteries.
Bill
On 11/30/2021 10:47 PM, b...@midnitesolar.com wrote:
Hi Bill
As I remember, the min is of course... Minimum time in Absorb.
Max is maximum time in absorb but depended on how long it took to ge
Yesterday, I was able to upload firmware to the Mate 3s, and the GS4048
and program it for AC coupling. I did not realize a firmware update
would shut down the inverter (makes sense that it does), so that was a
bit of a surprise, but all in all it went very well. The Mate3s
firmware was out o
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