Solar Power / Wind Power Shed

[DaveJ82]

Hi Guys

Later this year I want to do a solar power and or wind power installation into my allotlment shed. I've watched tonnes of YouTube videos and I've been to various sites, however, when attempting to work the maths to figure out how many batteries I need I must be going wrong somewhere as apparently I need 34 batteries. From there I need to work out what MPPT and how many panels / turbines - but I think I'm stumbling at the first hurdle!

Basically between December and march I want to power a heating cable that is 100W all day, everyday. I'll also want to run some strip LEDs 4.8w for 10-20 minutes every other day and maybe I'll want a brew - I've found a kettle that peaks at 672 watts.

In the summer I won't run the heating lead but it might be nice to use lawnmower at 1500w for about 20mins.

So how many batteries would I need? And at what AH?

because solar will produce less power in the winter can I run the wind turbine in conjunction as it's windy a lot of the time where I am.

Based on the above what amp MPPT and panels / turbines will I need?

Any help is appreciated and if you can explain the math a little then hopefully I can work out another installation that I might do for someone else on the allotment.

Thanks guys!

Dave

 

[DaveJ82]

Actually, I was stood in the queue for my Greggs sausage butty and brew this morning and realised that the heating wire wouldn't be on for 24 hours a day because it's going to be attached to a thermostat that will only turn it on when it becomes cold. However, I don't know how to quantify how long it will on for! Lets say 12 hours instead.

 

[mattg4321]

Get a petrol lawnmower for a start surely.

 

[Worcester]

Use a solar kettle - just search google, for cloudy days, take a flask.
2.4kWh (100w x 24 hrs) means battery storage of 4.8kwh (50% DoD) or maybe 2.6kWh lithion ion batteries, to generate 2.4kWh in winter without wind, you could easily need 2.5kW - if you can average 1kWh/kWp of PV during winter, you're not doing to bad.
Even then that's average, so half the time you won't have generated enough, so you need 5.2kWh of Li-ion storage....
You'll need to get stats for wind...
I would look at other ways of providing the heat.. (cold frames, cloche, etc)
Unless you have very deep pockets, and a partner that fully embraces your eco passion for your allotment, I would start with a budget and work out what the best you can get for that is - PV / Wind, battery backup, LED lighting.