We are building a prototype for a solar passive compost tea aeration unit and are in need of advice on a suitable DC solar power supply. The Idea : Is a simple and cheap DIY system for farmers to make directly on site and then make their own organic bio active fertilizer from vermicomposted waste. The compost tea can then be fed constantly at low dose and directly into the root zones, via dripline fertigation or foliar application. The Aim : To make quantities (1000L batch) of bio active compost tea to feed directly into our dripline irrigation system (fertigation) - and excess for sale. This unit is stage II of the vermicompost - worm farm system that we have existing. http://futurefeeders.weebly.com/our-blog/a-wriggling-resource https://www.youtube.com/watch?v=eQgrNtbYXTw The Design : The aim to keep materials cost to a minimum to make the unit functionally affordable for small scale farmers. As such we are aiming for under $1000. Request : I am requesting some advice, availability and a quote for the most affordable appropriate stand alone solar system. The system will require sufficient stored DC energy to power the pump unit as below or similar for 48H. Battery units will need to be able to maintain continuous operation, however w can assume viability under full sun conditions only. Costs and Components : <$100 Aeration Tank : Up-cycled 1000L holding tanks, readily available <$100 Pump : Hailea ACO-007 DC 12V Air Pump or similar <$200 Venturi Siphon kit for variable control of soluble and liquid fertilizer injection <$500 Solar panels and battery units <$100 Sundries : air pipes, grommets, taps, wires etc ![]() Pump Unit : Hailea ACO-007 DC 12V Air Pump POWER: 130W OUTPUT: 140L/min VOLTAGE: 12V DC PRESSURE: >0.10Mpa Additional Details : The brews can be adapted to be more fungal / bacterial dominant and mineral enhanced depending on the requirements of the crop and soil type. Soil Food Web has done great research on this. There are a number of units like this on the market however this units point of difference is that it is low lech and low cost. Big price tags and technicalities just put farmers off. I am trying to develop an appropriate technology; somethings that just makes sense and is simple and get people using them. These system could easily be adapted for remote communities, developing nations etc There are 240V systems available, but there is a need for an 'in the field' design that is off grid. Compost tea applications through fertigition have the potential to have big impacts on soil health, food nutrient density and plant disease resistance. It also give farmers the ability create their own organic inputs and drastically reduce fertilizer costs while cycling nutrients through waste organic matter. Would really value your input, assistance and support on this project.
12 Comments
Michael B
20/1/2015 08:56:49 pm
How much air do you really need? 140L/m seems a lot, and this pump will require a lot of juice.
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24/1/2015 06:42:22 am
Thanks Michael B,
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Karin Six
30/4/2015 06:21:18 am
We are trying to do the same... We have producers (miniature donkeys who also weed & prune) and are going organic! Please let us know what you came up with!
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Joel
30/4/2015 08:32:09 pm
Hi Karin,
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Karin Six
1/7/2015 12:53:02 pm
Thank you Joes. We have a 32 gallon trash can and a few solar aerators bought from amazon. We put the compost on a 5 gallon bucket and paint strainer bag. We add molasses too. It aerates for 24 hours and is then strained in muslin. We pour it on our fertilizer tank and it feeds our avocado trees.
Joel
1/7/2015 06:18:19 pm
Hi Karin, great to hear you have had success! keen to hear how your aerators are going? you are happy with them. 4/2/2016 04:49:20 am
Will keep you updated on how this goes through the blog.
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khawar shafi
2/5/2019 08:51:41 am
I am going to build off grid without battery aeration system for 1000L tank with estimated 130$ material cost but I am not sure how much is aeration requirement for such tank size and whether a low pressure pump can cause movement of air through highly concentrated viscous animal waste mixture.
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