[RE-wrenches] Inverter ratings exceeding 25kw fir battery backup

[Tyrone Houck]

In my view, the real consideration here is whether or not the utility
should be allowed to be the arbiter of how much capacity a homeowner is
allowed to back up. My stance is no. They can't tell you how big of a
backup generator you can have. Why should they get to dictate what capacity
the customer has with regards to inverter size,  assuming the system won't
backfeed in excess of net metering limitations.



On Tue, Feb 18, 2025, 11:38 AM Dave Angelini Offgrid Solar via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Still Jason it seems very crazy! When I do energy for a home in your neck,
> usually offgrid, we use mini-splits and in a large home
> like you are referring with the grid, the same thing, use a split for a
> zone, like the kitchen and save all that wasted battery capacity backing up
> the whole home. They may be a bit uncomfortable without the grid but they
> can survive a hurricane outage,
> or longer.
>
> The strategy of not backing up it all does require the people to be
> reasonable and trainable. Very few central air systems are useable without
> spending 10's of thousands more. I think none unless the owner has more
> money than brains. Good for the economy I guess but all that lithium has to
> go to the dump someday.
>
> Seems alot of lithium is going to the dump with all these companies
> building batteries and then going out of business also.
>
> Alot of my calls are for systems that the installer has long gone out of
> business. The owner is clueless because they never had
> a clue about their power system. No Bueno for sure!  Stay Safe !
>
>
>
> *Dave Angelini Offgrid Solar
> "we go where powerlines don't"
>    <http://members.sti.net/offgridsolar/>https://offgridsolar1.com/ <https://offgridsolar1.com/>  <http://members.sti.net/offgridsolar/>
> e-mail  offgridsolar at sti.net <offgridsolar at sti.net>
> text 209 813 0060*
>
>
> On 2025-02-18 9:42 am, Jason Szumlanski via RE-wrenches wrote:
>
> Haha, we would not have the pool heater on a backup system, but many times
> people want a partial home backup system with whole home annual grid
> offset.
>
> But for practical purposes around here, full-time residents often just
> trade pool heating for air conditioning based on season. If you size a
> backup system for central air conditioning, sometimes it is technically
> possible to heat the pool off-grid in the winter because the house load is
> otherwise a fraction of what it is in the summer months. In the winter, we
> sometimes see batteries full by 9:00 am and a lot of wasted solar energy.
>
>
>
> Jason Szumlanski
> Principal Solar Designer | Florida Solar Design Group
> NABCEP Certified Solar Professional (PVIP)
> Florida State Certified Solar Contractor CVC56956
> Florida Certified Electrical Contractor EC13013208
>
> On Tue, Feb 18, 2025 at 11:56 AM Dave Angelini Offgrid Solar via
> RE-wrenches <re-wrenches at lists.re-wrenches.org> wrote:
>
> Sure I get how important it is to electrically heat a pool in a power outage. 😉
>
> *Dave An,gelini Offgrid Solar
> "we go where powerlines don't"
>    <http://members.sti.net/offgridsolar/>https://offgridsolar1.com/ <https://offgridsolar1.com/>  <http://members.sti.net/offgridsolar/>
> e-mail  offgridsolar at sti.net <offgridsolar at sti.net>
> text 209 813 0060*
>
>
> On 2025-02-18 8:05 am, Jason Szumlanski via RE-wrenches wrote:
>
> There are many 4,000 sq ft pool homes in my area with electric pool
> heating and electric everything else where 25kW would just cover the
> electric bill. Some larger homes around here can definitely require more.
> Florida Power & Light allows up to 50kW on 120/240V split phase service,
> but only if expected production does not exceed an estimated 115% of
> historical annual usage.
>
>
> Jason Szumlanski
> Principal Solar Designer | Florida Solar Design Group
> NABCEP Certified Solar Professional (PVIP)
> Florida State Certified Solar Contractor CVC56956
> Florida Certified Electrical Contractor EC13013208
>
> On Mon, Feb 17, 2025 at 12:58 PM Dave Angelini Offgrid Solar via
> RE-wrenches <re-wrenches at lists.re-wrenches.org> wrote:
>
> Why is there a need for more than 25KW for residential please? Just
> curious. In Nevada, 25KW is way into commercial.
>
>
>
> *Dave Angelini Offgrid Solar
> "we go where powerlines don't"
>    <http://members.sti.net/offgridsolar/>https://offgridsolar1.com/ <https://offgridsolar1.com/>  <http://members.sti.net/offgridsolar/>
> e-mail  offgridsolar at sti.net <offgridsolar at sti.net>
> text 209 813 0060*
>
>
> On 2025-02-17 9:43 am, Tyrone Houck via RE-wrenches wrote:
>
> Greetings wrenches,
> In Pacific Power territory we are coming up against roadblocks with
> regards to whole house battery backup systems with inverter ratings higher
> than 25kw. Even when the generation capacity is below the 25kw residential
> limit, net metering applications are being rejected based on the inverter
> rating.. The inverter rating in these cases is sized to handle the
> customer's existing loads and will never export more than the 25kw limit
> dictated by Oregon PUC.  I am drafting a letter to Energy Trust, the state,
> etc. But am curious if anyone else gas had this problem or come up with a
> solution. I would appreciate to hear any experiences or similar
> interactions with PGE or PPL or even how this has worked in other
> jurisdictions, states, etc. Any input or support is greatly appreciated.
>
> Tyrone Houck
> Oregon Solarworks LLC
> CCB #204937 LRT #076
> 541-787-1366
> tyrone at oregonsolarworks.com
>
>
>
>
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