[RE-wrenches] Midnite Powerflo16 DOD vs Cycle life
Ray Walters
ray at solarray.com
Tue Feb 4 13:55:46 PST 2025
Like all Li+ batteries, the voltage stays fairly constant for most of
the capacity, and then dives at the end. An LBCO of 48 v or lower, is
not going to work in my experience. The SOC vs V chart for the Powerflo
doesn't look any different than most other brands. You'll end up with
the BMS shutting the battery off, which will then not allow it to accept
charging from the (hopefully) DC coupled PV array. Then you're in for
dark start, where you need to bring a 48 vdc power supply of some sort
that can output 48 vdc even to a 0 v buss to wake the BMS up.
Basically a well pump or other large load will pull the battery voltage
down so hard and fast that it will occasionally get past even an LBCO
set at 49 v (max available setting on Magnums) I agree with Wallace
here, that you want a setting above 50 v, to be useful. You need enough
SOC left to make up for the self discharge of the battery and BMS, so
the charge controller can wake up the next sunny morning.
All of this depends on the time and current programming that are behind
that LBCO function. Most LBCO setups are designed to allow high
current for short time periods, which means the BMS may beat it to the
shutdown. Offgrid, especially with legacy inverters, this is a very
real problem, and one reason I'm still using lead acid batteries in some
systems.
Homegrid batteries are wired with one less cell in series for closer to
true 48 v performance, but I can't recommend them yet, because I've had
some firmware glitches with the one system I've tried them on.
Ray Walters
Remote Solar
On 2/4/2025 9:07 AM, Wallace Stahle via RE-wrenches wrote:
> Hi Jeremy,
>
> I am under the impression that leaving at least 10% of capacity will
> extend total cycle life.
> The chart states 50.4 volts is a 10% SOC.
> Then there is the LBCO delay time that may allow battery shutdown
> before the inverter does.
>
> Of course the OB FX LBCO upper limit is at 48 volts thus the recent
> search and discussion for a seamless external inverter shutdown to get
> users attention if an AGS is not in the mix.
>
> Wallace Stahle
> Future Electric Energy Co
> PO Box 236
> Willits, CA 95490
> 707-459-0474
> Lic.#C10-762093
> future at pacific.net
>
>> On Feb 3, 2025, at 7:11 PM, Jeremy Rodriguez via RE-wrenches
>> <re-wrenches at lists.re-wrenches.org> wrote:
>>
>> Today I installed 3 of the MN
>> POWERFLO 5 batteries with an OBVFX3648
>> Per the battery label I was able to set the inverter LBCO to 46 vdc.
>> I see that the battery BMS range
>> Is 44.8-58 vdc
>> We should be good to go.
>>
>>
>> Jeremy Rodriguez
>> Solar Installation / Design
>> All Solar, Inc.
>> 1453 M St.
>> Penrose Colorado 81240
>>
>> Sent by Jeremy's iPhone. Sorry for typos and shorthand.
>>
>>> On Feb 3, 2025, at 1:47 PM, Nick Lucchese via RE-wrenches
>>> <re-wrenches at lists.re-wrenches.org> wrote:
>>>
>>>
>>> Here is the voltage vs SOC approximation chart from Midnite. Was
>>> helpful for me on my first couple installs as I awaited some
>>> additional details about their batteries.
>>>
>>> Nick
>>>
>>> On Mon, Feb 3, 2025 at 6:50 AM William Bryce via RE-wrenches
>>> <re-wrenches at lists.re-wrenches.org> wrote:
>>>
>>> Hi Jay
>>>
>>> The settings for the MNS Batteries are on a sticker on each
>>> battery.
>>>
>>> BMS- LVCO 44.8 HVCO 58V (The HVCO is not on the sticker)
>>> LVCO (inverter) 46.0
>>> Float 54V
>>> Bulk 56.1V
>>>
>>> The rest of the you can set to what you want, the battery does
>>> not care.
>>> All Prismatic cells operate mostly the same, and the MNS
>>> Batteries use A+ Automotive cells MFG by EVE.
>>>
>>> Thanks
>>>
>>> Logan
>>>
>>>
>>> On Mon, Feb 3, 2025 at 8:47 AM Jay via RE-wrenches
>>> <re-wrenches at lists.re-wrenches.org> wrote:
>>>
>>> Hi Bill
>>>
>>> I tried and failed to find any setting information on that
>>> battery besides charge and float.
>>> Kinda need to know things like LVD, recommended LBCO, etc.
>>> But if it’s similar to other prismatic cells you should be
>>> able to set the OB inverter to a LBCO that works without
>>> having to go through a aux relay.
>>>
>>> Jay
>>>
>>> > On Feb 2, 2025, at 9:53 PM, Bill Battagin via RE-wrenches
>>> <re-wrenches at lists.re-wrenches.org> wrote:
>>> >
>>> > Have any off-gridders done a system with Powerflo16's to
>>> power pre-LFP OB/FX inverters? The FM80's LFP settings in
>>> this system are compatible with LFP but I'm looking for
>>> options other than using the Aux in the CC's wired to a NC
>>> relay and from there to the inverter on/off landings in the
>>> green terminal of the OB/FX for the LBCO and reconnect function.
>>> >
>>> > I've been down this road before, though a
>>> different equipment. I've used the Aux from a Classic for
>>> inverter LBCO and reconnect though its never been fully
>>> "tested", although I read "open" and closed" at the un-wired
>>> aux landing when I forced it with a high LBCO setting. Just
>>> thinking about the highest reliability.
>>> >
>>> > Thanks in advance.
>>> >
>>> > Bill
>>> >
>>> > Feather River Solar Electric
>>> > Bill Battagin, owner
>>> > 4291 Nelson St. (Shipping)
>>> > 5575 Genesee Rd. (USPS, UPS)
>>> > Taylorsville, CA 95983
>>> > 530-284-7849, 258-1641(cell)
>>> > CA. C10 Lic # 874049
>>> > Solar Powered since 1982
>>> > Home of the Sunny Side Up
>>> >
>>> >
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>>> <Powerflo16 Battery SOCvsVoltage.jpg>
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