home router battery backup

Joe Maimon jmaimon at jmaimon.com
Tue Jan 18 16:21:51 UTC 2022


Mark Tinka wrote:
>
>
> On 1/18/22 00:26, Jordan wrote:
>
>> Wow, that's a nice program.  Do you know what they keep the
>> "reserve percentage" set to, the proportion of stored energy that
>> will never be discharged for grid-support, but held back for
>> island-mode use in case of an outage?
>
> I don't use the Tesla Powerwall, but Li-Ion is generally the same
> regardless of who packages it. The difference will be what the OEM
> decides to set the low-voltage cut-off to on the inverter and/or BMS.
>
> I'm not sure how much the owner can configure a Tesla Powerwall, but
> with other installations, you can decide when your battery kicks in to
> run loads, or when it hands back to the grid or generator. This
> assumes evening time, when solar irradiation is unavailable, of
> course, as that is generally the preferred source of energy.
>

Now how about some programming available so you can decide what 
thresholds and conditions remote start your genny which powers the 
rectifier which substitutes|augments the solar array?

All those 6500 PS lying about would make awesome rectifiers.....

Joe

> I've heard that Tesla will monitor the weather in your area to
> "pre-charge" the Powerwall to account for possible power disruptions.
> While I find that rather invasive, it's a cool feature for folk who
> "don't want to know". Then again, I also hear that Tesla will limit or
> withhold support and/or warranty if you do not connect your Powerwall
> to the Internet for them to "manage". The downside I hear, with that,
> is that they can remotely adjust SoH (state of health) thresholds to
> lengthen battery life in order to meet warranty promises. Not sure how
> true that is, but I've heard it a lot.
>
> In terms of "reserve" capacity, Li-Ion can go much deeper than Lead
> Acid. Some inverters are setup to disconnect the battery anywhere
> between 3% - 20% SoC, depending on the OEM. For LFP chemistries, the
> BMS will usually turn the pack off at 2.50V, while for NMC, that will
> be around 2.75V. But different battery OEM's may be more or less
> aggressive with their BMS's, depending on who you choose to buy from.
>
> Mark.
>
>




More information about the NANOG mailing list