[RE-wrenches] Boot-strapping discharged lithium batteries.

Wed Dec 11 11:45:42 PST 2024

William...

I have found that the best way to do this is to get a regulated power
supply...

You can use a 60V-5A regulated power supply such as this.

https://www.amazon.com/Adjustable-Switching-Regulated-Adjustments-Jesverty/dp/B0B7739SMN/ref=sr_1_3?crid=23FQP9GRXJN8V&dib=eyJ2IjoiMSJ9.8lw5oh09yqEulTUX5HEVIIDjBTKpHwzMunKsxWbirnjrTcbTeCRMpvBkvecHly3QdpCCneegdeFTlmca1113laVHIMZkY4Y_o01Ju1LnSLeXjKUPqLwojKzLHVlADneIPWCWsvCoWU9M6Fh4YCBs48kp4eECgcZz7yvdMMVVNHeJkxlFjdvtX9yVW3TGV_wq1BAeToAbxIpzVofasQZ96Ct8GRBLW1bVabcCc_RmAhs.4rbtHxDJBEfcDO734UIYkkHpTk6Cr64NgmGhT7Co2B4&dib_tag=se&keywords=60V+Regulated+power+supply&qid=1733945986&sprefix=60v+regulated+power+supply%2Caps%2C173&sr=8-3

I have found that this is a great way to wake up LFP batteries that have
gone into protection mode.

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On Wed, Dec 11, 2024 at 11:22 AM William Miller via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Bruce:
>
> There has been some correspondence here on boot-strapping low SOC lithium
> batteries in protect mode. Buying an outboard battery charger seems hard to
> accept when you are standing next to a sophisticated battery charger.
>
> We had a few occasions of a large E-vault system shutting down for low
> charge due to mis calibration of SOC. We restarted the system by
> disconnecting the closed loop data connection, reprogramming the inverters
> to think they were operating with a VRLA bank and restarting the system.
> The battery bank, when restarted came on line just long enough to accept
> battery charging.
>
> Once the SOC came up to acceptable levels we reset the system for a BMS
> battery and we were back running.
>
> Maybe this procedure might work for someone else. I have a step-by-step
> for doing this with a Sunny Island system if anyone wants to look it over.
>
>
> William Miller
> Miller Solar.com
> 805-438-5600
> www.millersolar.com
>
>
> On Wed, Dec 11, 2024 at 11:08 AM Bruce Erickson via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> Recently one of our four now-orphaned SunVault systems failed to back up
>> for our customer. On site we found the batteries discharged below cut-in
>> voltage for unknown reasons (no more monitoring, no more tech support).
>> Even though it had been sunny for a few days the system failed to retain a
>> reserve to restart once sun returned. I’m looking for recommendations for
>> 48 volt external chargers for this situation. We’re looking at Iota which
>> only has a 13 amp charger at 48v but does have a plug-in module for
>> controlling LiFePo charging. At 256 amphours of parallel batteries
>> hopefully an 8 or 10 hour charge would get us up to cut-in. I’m also not
>> sure how the Iota will play with any BMS the SunPower batteries might have.
>> Any recommendations for this situation would be much appreciated.
>>
>> Thanks in advance,
>> Bruce
>>
>> Bruce Erickson
>> Mendocino Solar Service
>> 707-937-1701
>> PO Box 1252
>> Mendocino, CA 95460
>>
>>
>>
>> "Serving the Solar System"
>>
>>
>>
>>
>>
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