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ddllmcb

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Posts: 3
Reply with quote  #1 
Hi, I am planting a few avocado trees where they should not be planted...  We get occasional winter night temperatures of 25F or a bit lower.  I want to devise a scheme for supplying a small amount of heat to these trees from panel-charged batteries, and actuated from a thermostat.  People have used old style Christmas tree lights , connected to AC obviously, for this purpose, but this is inefficient at best. 

One thought was to use DC heating strips wrapped in the branches of the trees.  Not much heat is required, just enough to keep the average ambient temperature around the trees above 26F.

Ideas?

Thx

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ddllmcb

stmbtwle

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Reply with quote  #2 
Going to all the expense of solar panels, batteries, etc for "occasional" use doesn't seem very cost effective to me. If you have another use for all that hardware the rest of the year, it might make sense. Do the math.

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Rick H Parker

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Reply with quote  #3 
For occasional low temperatures it sounds like over kill.  We might be able to cook up a inexpensive solar thermal solution for young trees using the greenhouse effect and a blanket at night.

I'm think, build box frames big enough to cover the young tree. Cover five sides with clear plastic. When low temperatures are coming place the box over the young tree (Miniature greenhouse). Toss a blanket over all at night to conserve the heat gained during the day.


"Preparation of the Mature Avocado Tree

Fertilizing the avocado tree with nitrogen throughout the season allows the foliage to build up nitrogen, which, in turn, helps protect it against stresses, such as cold temperatures. At the first sign of impending frost, water the avocado tree. This helps the tree to better tolerate cold temperatures, according to the California Avocado Commission. Also, remove weeds under the canopy as they tend to block heat that may radiate from the soil.

Protection for the Young Avocado Tree

Prepare the young avocado tree in the same manner as the mature tree by watering the soil several days before the frost, packing soil around the base and pulling weeds beneath the canopy. Use a tarp or blanket to completely cover the tree. For added protection, Texas A&M; University suggests placing a camp lantern, strings of holiday lights or a heater under the blanket or tarp, though you will need to be careful of fire risks."

Source


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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
ddllmcb

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Posts: 3
Reply with quote  #4 
Thank you, good idea for young trees, and I do plan to shelter them.  However, <25F can kill or damage even mature trees which are too big to shelter.  I am thinking that hanging DC pipe heating strips from the branches is a potential solution (again, this is a challenge and labor of love, not rational agriculture...), but I have not been able to get any information to assist with a design.
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ddllmcb
Rick H Parker

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Reply with quote  #5 
" I am thinking that hanging DC pipe heating strips from the branches is a potential solution"

How about lighting up the tree with sun lamps, simulate a warmer day. The tree will adsorb the infrared light and convert it to heat. 

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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
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