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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