[RE-wrenches] Li+ Systems Puerto Rico

[bob at midnitesolar.com]

I was in Puerto Rico last week up in the hills helping train with a 
small-ish off-grid combination systems.

What I saw in our training building was a Sonnen system with OB Radian, 
Four Sonnen Li batteries, some external circuitry

(relays, etc) and PV using Enphase inverters running in AC coupled 
mode.  Batteries when I saw the SOC was sitting

at 91 percent which, as I understand, might be good for longevity but 
might have been there because the system

can't just frequency shift.  This system appeared to work very well.

I could get used to staying in PR !

boB


On 2/19/2018 11:14 AM, Ray wrote:
> Greetings Wrenches;
>
> We are designing several systems for Puerto Rico, and while these will 
> eventually could be grid tied once the grid returns, they will need to 
> operate reliably in off grid mode possibly for a year or more.  What 
> is everyone's experiences with the Storedge and LG setup?  I've worked 
> with the regular Solaredge GT system and was quite impressed, but I've 
> heard the Storedge is not a good off grid option.  What are the 
> issues, and has anyone used the Storedge in longer term outages?
>
> Right now we are designing some smaller systems that will use Magnum 
> inverters with 24v and 48 v Li+ batteries from other manufacturers, 
> like Simpliphi and LiFe Blue. ( No GT, Backup only)  These are lower 
> cost and allow us to use more traditional off grid designs, but also 
> have limited charge and discharge current.  In order to make Li+ cost 
> effective, we have had to reduce the storage size in half compared to 
> lead acid.  We feel this is justifiable considering Li+'s ability to 
> be discharged to 100%, its voltage stability, and its higher efficiency.
>
> All feed back is welcome, as we venture into less well charted 
> territory.  We just don't want to set up systems that are going to not 
> be functional in 5 to 8 years because of inferior AGM lead acid 
> batteries.  We use HUP batteries for most larger off grid systems, but 
> these are not feasible because of their size and maintenance 
> requirements.
>
> Thanks,
>
> Ray Walters
>
> Remote Solar
>
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