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Solar powered lights

Travis Kelcee

Active member
I don't really see the use case. The idea of off grid is attractive until you need replacement parts, food and other supplies or your neighbours see that you're the only house with lights.
To safeguard a grow a UPS to keep ventilation running (and odors low) is a cost effective solution. Plants survive days without light.
After 3 days without electricity there are other problems than weed.
Let me try again to explain it to you.

I live in the middle of nowhere. Neighbors and odors are not a thing for me. When we lose grid power it can take days to restore. So having a back up generator is essential to keep the lights, heat and appliances going where I live.

Most people use a portable generators or have a Generac type whole house generator installed. So they can have heat, lights, etc in the event of a blackout. We usually get a couple a year that last 24 hrs or more up to 10 days.

Portable generators are not designed to run continuously can use quite a bit of fuel.

An installed whole house generator with propane tank costs around $8k - $10k and use a lot of fuel.

My solar DIY backup generator cost around $9k, "fuel" is free.

Now if I had a portable generator or a whole house gen, using it in place of grid power to run a grow would be costly and stupid.

The same way it would be stupid not to take advantage of the free electric my DIY solar backup generator makes everyday.

Not sure why this is so hard to understand.
 

Orange's Greenhouse

Active member
Let me try again to explain it to you.

I live in the middle of nowhere. Neighbors and odors are not a thing for me. When we lose grid power it can take days to restore. So having a back up generator is essential to keep the lights, heat and appliances going where I live.

Most people use a portable generators or have a Generac type whole house generator installed. So they can have heat, lights, etc in the event of a blackout. We usually get a couple a year that last 24 hrs or more up to 10 days.

Portable generators are not designed to run continuously can use quite a bit of fuel.

An installed whole house generator with propane tank costs around $8k - $10k and use a lot of fuel.

My solar DIY backup generator cost around $9k, "fuel" is free.

Now if I had a portable generator or a whole house gen, using it in place of grid power to run a grow would be costly and stupid.

The same way it would be stupid not to take advantage of the free electric my DIY solar backup generator makes everyday.

Not sure why this is so hard to understand.
Yea that makes sense but why design it to run a grow light? That is not essential and during a 5 day power outage there are higher priority tasks than growing weed.

If you look at my rough calculations regarding efficiency. At the high end you have 4 % efficiency. For 1 m² of canopy you need 25 m² solar panels. During winter 2-3 times that and if you want to compensate for cloudy days it takes another 4 times the space. That's 300 m³ at the extreme end.

So yea, it is hard to understand why anyone would turn sunlight into grow lights.
 

b8man

Well-known member
Veteran
I recently got solar in the uk so did an experiment with my last grow to see if it was viable.

With a 6kw + 5.5kw battery, I was fine doing a modest 600w grow inside powering all fans and the occasional dehumidifier. The issue is that you need to run the lights when the sun is shining with a battery that small, so you’ve got the heat of summer and the heat of the lights which isn’t ideal. If we didnt have such a mild summer I’d have had heat issues.

Saved a fair bit on electricity though.
 

Travis Kelcee

Active member
Yea that makes sense but why design it to run a grow light? That is not essential and during a 5 day power outage there are higher priority tasks than growing weed.

If you look at my rough calculations regarding efficiency. At the high end you have 4 % efficiency. For 1 m² of canopy you need 25 m² solar panels. During winter 2-3 times that and if you want to compensate for cloudy days it takes another 4 times the space. That's 300 m³ at the extreme end.

So yea, it is hard to understand why anyone would turn sunlight into grow lights.
I didn't design it to run a grow light.

For the 5th time..........I designed it to be a backup generator, because the cost was in line with a Generac and propane tank install. Where I live you need some kind of backup power if you don't want to freeze to death.

You can spend $300 on a small portable generator or around $10k for whole house generator with automatic transfer switch and a fuel tank. Portable gens are not great in prolonged grid down situations.

I've lived here 3 years and power has gone out 6 or 7 times. The longest was 3 days during an ice storm. It's a rural mountain area where it's not uncommon to get snowed in for days at a time. During mass outages we are lowest priority for power restoration.

I owned a house in Suburbia for 35 yrs and lost power 1 time for 10 hrs. So generators were not so common and I never owned one.

Now if you can wrap your head around the fact that I didn't build a solar backup gen to run grow lights.

Then maybe you can start to understand the logic in using the free electric it generates while it's just sitting there waiting to be a backup power source.
 

Porky82

Well-known member
I didn't design it to run a grow light.

For the 5th time..........I designed it to be a backup generator, because the cost was in line with a Generac and propane tank install. Where I live you need some kind of backup power if you don't want to freeze to death.

You can spend $300 on a small portable generator or around $10k for whole house generator with automatic transfer switch and a fuel tank. Portable gens are not great in prolonged grid down situations.

I've lived here 3 years and power has gone out 6 or 7 times. The longest was 3 days during an ice storm. It's a rural mountain area where it's not uncommon to get snowed in for days at a time. During mass outages we are lowest priority for power restoration.

I owned a house in Suburbia for 35 yrs and lost power 1 time for 10 hrs. So generators were not so common and I never owned one.

Now if you can wrap your head around the fact that I didn't build a solar backup gen to run grow lights.

Then maybe you can start to understand the logic in using the free electric it generates while it's just sitting there waiting to be a backup power source.
Maybe you need to draw him a picture so he can understand. The lights appear to be on but nobody's home!
 
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