Good Day Esteemed Wrenchers,
So we are doing more work in developing countries where the grid is
super unreliable but on for some hours almost daily.
So let's say we have a grid that's on 9 AM - 11 AM and 4 PM - 7 PM each
day but often browns-out during those hours and comes on and off during
those hours. 230 VAC voltage can drop to 160-180 periodically or go
above 260 in spikes.
The present practice in many of these situations is for battery based
system designers/installers is to set up an off-grid system in parallel
to the mains but not relying on them - so the grid AC IN is not
connected. They just install a transfer switch and manually switch or
they wire a critical loads panel to the solar.
This avoids constant switching and nuisance shut-downs from the battery
inverter and protects it from burning out trying to handle the grid.
MY QUESTION:
I'm wondering what we can do to use the grid when it is up for
opportunity charging of the batteries while at the same time not
subjecting our nice new battery inverters to constant brown-out tripping
and possibly long term damage.
So question #1 - Is anyone using existing battery inverters but
succesfully navigating such a grid variablity settings such that you are
able to take advantage of the grid even if browning out often?
or question #2 - Can we add some sort of high Voltage and Frequency
tolerant battery charger to the system - keep the battery
inverter/charger off grid - but charge the batteries from something able
to handle the wonky grid without constantly nuisance charging or burning
itself up?
Your thoughts and wisdom I await!!!
Best,
Jeff
--
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Jeff Clearwater
Village Power Design
linkedin <https://www.linkedin.com/in/jeff-clearwater-0622a312/>
www.villagepowerdesign.com <http://www.villagepowerdesign.com>
cell - 413-559-9763
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