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Can I use a solar panel, a lawn garden battery and some sort of copper wire to warm my garden soil for earlier planting?

I have a cloche set up but want to keep my soil warm at night inexpensively.

No. You need far more power than you can collect from a solar panel, and a copper wire isn't what you need to generate heat. Rig some "hoop greenhouse" things or learn about cold frames and other cold-weather gardening methods.
jkimball8 years ago
You are better off using the thermal properties of sunshine, especially if cost is your main concern. Black cloth will dump more energy into the dirt than a solar powered electric heater will, at least at the level you are dealing with.
dzkns4u8 years ago
try to check out the BBC show "It's Not Easy Being Green" Season 1 - Episode 2...a homemade solar greenhouse heat sink is made and is really ingenious & fairly inexpensive...or do a google search on "solar greenhouse heat sink", there are numerous sites...here's 1; solar green househouse heat sink