[RE-wrenches] 3rd party appraisal for Sonnen system donated to community college?

[Chris Sparadeo]

Hi Dan,

I have experience with installing and servicing Sonnen. Although I let my
certification lapse, Sonnen still allows me to work on their systems (maybe
because no one else will in my area). Let me know if I can be of any help.

Best,

Chris

On Mon, Feb 9, 2026 at 8:27 PM Dan Fink via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Esteemed Wrenches — Please contact me off list if you are willing and able
> to provide such a document as described here.
>
> I run the NABCEP PV Associate training program at Pueblo Community College
> in Colorado, funded by a State renewable energy workforce development
> grant. A colleague way up in NOCO where I live is upgrading the ESS at one
> of his installations away from the existing Sonnen. His client wants to
> donate it to the college. The original Sonnen ESS equipment cost, no
> install labor included, was right at about $24k.
>
> The IRS paperwork 8283 clearly states that the Appraiser cannot be me or
> anyone from the college, and can’t be anyone from the PV installation
> company either.
>
> PCC and myself would be eternally grateful if someone with Sonnen
> experience could help and provide an appraisal. The client wants a tax
> deduction of course, but my students and myself could have endless fun with
> a vintage Sonnen, explore different battery charge/discharge curves, try to
> dark start, etc.
>
> TIA, please contact off list. I have lots of photos, receipts etc.
>
> Dan Fink
> Renewable Energy Program Coordinator, Pueblo Community College
> IREC Certified Instructor for PV and Small Wind Installation
> NABCEP Certified PV System Inspector
> NABCEP PV Associate
> danbob88 at gmail.com
> 970-672-4342
>
>
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