[RE-wrenches] Frequency shift on AC coupled off grid resi system

[Chris Anderson]

Wrenches community,

Hope folks are well out there. I am wondering if anyone has
experience addressing a frequency oscillation with a split phase off grid
Sunny Island system. I am working on an off grid home project with 2 units
that has just not worked right since installation. The small number of 240
volt loads and most notably the geothermal heat pump goes into a loud
vibration as the frequency shifts and does so for 20 seconds, then settles
down into normal operation. 45 seconds later, it does it again and just
repeats itself until the water in the storage tank is up to temperature.
The current draw doubles when it is vibrating and it seems to drain the
batteries faster than expected when left on.

Wondering if anyone out there has any thoughts or is experienced off grid
tech in New England interested in some troubleshooting work to help resolve
things.

Please email me directly if possible at the following address -
canderson at borregosolar.com

Thanks and stay safe out there.
-- 

Best,

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*Chris Anderson* | Senior Vice President

E: canderson at borregosolar.com <jpitera at borregosolar.com> | T: 978-513-2635
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