I agree, and I am lucky to work in a space where budgets are usually
healthy.
On the other hand, oversizing the battery negates one of the best benefits
of an LFP upgrade – less capacity needed due to deeper discharge.
I would be great if they could find a way to reduce parasitic draw in
parallel
Of course not all clients are monetarily capable or willing to oversize
a Lithium based battery but many can. In my mind this is a simpler
solution. Its a strategy we're using more to avoid that voltage cliff
and reduce the likelihood of even nearing the BMS shutting down with all
of its hassle
Everyone wants to compare the AIO inverters to the older low
frequency inverters when it comes to the idle power draw. But everyone now
wants all the bells and whistles.
Nothing is free, and if you take an older system then add up the charge
controllers draw, SCP monitoring system, Gateway device,
One advantage of the blue ion if I have it right is they had a charge circuit
built in using diodes. Which meant it could charge even though it was not
discharging. Pretty trick design.
I do think the Lithium folks need to have a much better way to deal with
someone who has black start situ
The voltage cliff is a real issue. Even though LFP batteries can be pretty
deeply discharged without damage, for practical purposes we need to set the
LBCO on the inverter at a relatively high voltage (or SOC) to avoid the
steep part of the cliff altogether, rendering a good part of the capacity
es
Thanks, Darryl... I'm not that smart, If I were I'd be retired by now!!!
I'm just relating what I've seen over the past three decades...
On Sat, Feb 22, 2025 at 8:35 AM Darryl Thayer via RE-wrenches <
re-wrenches@lists.re-wrenches.org> wrote:
> Would you be able to do this with the Morningsta
Would you be able to do this with the Morningstar relay driver? The relay
closes and starts the generator when the battery voltage reaches a certain
level. The following is an inferior idea; use an Egauge in particular if
you want to do other monitoring, and have the Egauge with a relay driver
clo
Hello all...
The first issue is that inverter/charger parasitic loads have increased
exponentially in the past 20+ years. When the LBCO cuts out, the inverter
may shut off, but it does not remove itself or any other DC-connected
device from the battery. These devices still draw a parasitic load.
I like where your going with this Jason
On Sat, Feb 22, 2025 at 5:08 AM Jason Szumlanski via RE-wrenches <
re-wrenches@lists.re-wrenches.org> wrote:
> I have been thinking a lot recently about the reasons off-grid systems can
> shut down, and working on strategies to prevent these nuisances that
I have been thinking a lot recently about the reasons off-grid systems can
shut down, and working on strategies to prevent these nuisances that
require manual intervention.
Ideally, a BMS should never shut down due to low voltage/SOC because a
properly programmed inverter should reach it's cut off
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