Powerwall / Solar / Grid backup

U

Uwe Druckenm?ller

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Aug 23, 2017
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I have 3D printers running 24/7 consuming about 500W.
I would like to have solar panels charge a power wall.
The printers would be plugged into the power wall.
However, if the power wall runs low I would like to automatically
switch to the grid to not lose power.


How would I go about that?
thanks
 
I'm still new here but what I would do is have a second battery charge controller that you could plug into the grid power.
 
UweDruckenmller said:
I have 3D printers running 24/7 consuming about 500W.
I would like to have solar panels charge a power wall.
The printers would be plugged into the power wall.
However, if the power wall runs low I would like to automatically
switch to the grid to not lose power.


How would I go about that?
thanks
Click to expand...

You can have your 3D printer running on Solar.. There's a number of areas you may consider:

1) More Solar panels will top up your battery faster...
2) More battery capacity will provide more runtime.
3) Consider use hybrid inverter for more option..

as above, the cost will go up on any option you choose, you need all three to work together... If you can find a cheaper option on those items, it will be a bonus.
 
I think he's pretty much talking when the batteries have run low and wants to switch from Battery->Inverter to full on AC Mains. To do that simply, you could just get a set of contactors. They could be wired up in such a way that when voltage on the batteries are high, the inverter is on, when the batteries get low, it gets switch over to Mains with out about 10ms burp. Daromer has several video's on the contactors and shows them in action.

And what I mean by automatically, you'd have a relay that can switch AC loads from DC power. It only needs to handle a few watts to trigger the contactors. If you want to make it fancier and put timers on it so that certain times of the day it switches, then I'd go with the arduino to do some basic programming.
 
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