I was asked on another forum about solar ponds. All in all solar for your entire house is best however if one wants to venture into "Off-Grid" ponds here are some photos of a smaller setup. The yard and pond is undergoing some work however this gives a good idea of the type of equipment one needs to complete such a project.
Some stats:

A few inverters with a pair of Volt meters ( used to see the power output of the solar panels)

1 of 2 battery used for powering the LSS when solar is not enough and also to charge the battery

The Sun pump is flowing 1622gph while the other is doing 2912gph

If looking into off grid solar ponds a few notes. When running Sun Pumps have at least 2 batteries better 3. One single 200+ watt panel will do well. One can probably do a solar off grid setup for around $800.00.
For more info on Sun pumps and running off grid panels you may want to checkout our website. Anyone else running solar please share. I'de love to see others input as well
I'll be posting in the video lounge to show the flow rates first hand as well from these work horse pumps.
Some stats:
- Koi Fanatics Fiberglass 3000gallon Pond / Custom color gel coat
- 2- 3" Koi Fanatics bottom drains
- 1- No niche skimmer
- 1-Koi Enterprise Autofill System
- 2-Wave 57Watt Ultraviolet Sterilizers
- 2-EA Eazy Pod Filters on separate bottom drain circuits
- 2-TPR's
- 1- Sequence 750 4200 115V running 1.8amps ( Used for filter system back up)
- 1- Sequence 750 Sun Pump ( Used for waterfall)
- 1-AirTech 70L air pump used for added aeration and cleaning the Eazy Pod Filters
- 6-10"-16" Koi Fish
- A few goldfish
- 2-Hi Fin Sharks 12"
A few inverters with a pair of Volt meters ( used to see the power output of the solar panels)
1 of 2 battery used for powering the LSS when solar is not enough and also to charge the battery
The Sun pump is flowing 1622gph while the other is doing 2912gph
If looking into off grid solar ponds a few notes. When running Sun Pumps have at least 2 batteries better 3. One single 200+ watt panel will do well. One can probably do a solar off grid setup for around $800.00.
For more info on Sun pumps and running off grid panels you may want to checkout our website. Anyone else running solar please share. I'de love to see others input as well
I'll be posting in the video lounge to show the flow rates first hand as well from these work horse pumps.
Best way would be a heat exchanger and cover your pond or cut down the surface area where heat is mostly lost. I know of a few projects we did back east with radiant heating within the pond floor however this was on a new build. If you want more info let me know and I can dig that up