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Old 03-17-2020, 06:54 AM
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When using a solar set up , meaning off grid .
When there is no electric draw on the system ,and your batteries are full.
What happens to the energy collected ,buy the panels ? I imagine it has to offset some how, or it would be a hazard .
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Old 03-17-2020, 07:25 AM
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Offset? The charge controller disconnects the power. The power didn't float out.
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Old 03-17-2020, 01:28 PM
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I understand that would keep batteries from becoming ,over charged .
What about the solar panels themselves , don't the still collect PV
energy ? Were does that energy flow to ?
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Old 03-17-2020, 01:39 PM
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I understand that would keep batteries from becoming ,over charged .
What about the solar panels themselves , don't the still collect PV
energy ? Were does that energy flow to ?
No where.

You can think of it like a sponge that is full of water. It can't soak up any more, no matter how much water you pour on it.
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Old 03-17-2020, 02:09 PM
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Originally Posted by surfcast View Post
When using a solar set up , meaning off grid .
When there is no electric draw on the system ,and your batteries are full.
What happens to the energy collected ,buy the panels ? I imagine it has to offset some how, or it would be a hazard .
Batteries to stay 'full' will need a constant trickle.
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Old 03-17-2020, 04:12 PM
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It goes nowhere, it's like leaving the switch in the off position but it remains there for when it's needed.
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Old 03-17-2020, 04:38 PM
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I am amazed I would have figured, the would get so hot they would catch fire.
And the Leads going down to the charge controller, would melt away .
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Old 03-17-2020, 07:30 PM
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I am amazed I would have figured, the would get so hot they would catch fire.
And the Leads going down to the charge controller, would melt away .
Like I said, its like a sponge once a panel reaches its max voltage if there is no where for those electrons to flow it doesn't pump out any more of them. It just sits there. The panel heats up, but only so much as any dark metal panel would in the sun. When a sponge is full it doesn't swell up like a ballon and burst, the extra water just isn't absorbed.

if the sun could heat up things and make them catch fire just because they aren't charging a battery that would happen all the time all around us. The energy density just isn't that high.

ALL that PV panel does is turn some of the energy that falls on it into electricity instead of heat.
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Old 03-18-2020, 08:30 AM
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Electricity needs a complete circuit to do anything. It can't do anything(change of energy) with out a complete circuit.
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Old 03-18-2020, 11:32 AM
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Just like a battery
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Old 03-18-2020, 12:09 PM
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If no current is flowing in a PV panel then nothing happens. A good charge controllers change the voltage and amperage going to the batteries. A lot of systems are set up to not us the energy. Some older systems had a smaller air heater to dump power. Those panels were made differently than the modern ones.

My system is set up to heat water and I think that is semi common.
I know of a system that pumps water up a hill as the house uses a gravity water system.
I know of one system that refills there compressed air tanks when the batteries are full.


I'm not off grid. We do have grid power, but nothing in our home runs off the grid. We are set up on time of use billing for power.

There are a few outlets in our shop that are on the gird.
We also top heat our water storage tanks at night from the grid.
There are times we have topped off our batteries at night from the grid.
With a few switches we can move the house onto grid power.

We use about 250kw a month in the winter and about 35kw a month the rest of the year. 99% of the power we use if off peak so we pay .05C a kw I think. Most months I have to pay the minimum connection fee $35.00.

We use LPG for cooking and to dry laundry. We have a backup LPG heater. Yes we have AC and use it all summer.
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Old 03-28-2020, 08:11 PM
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Well the panels and the output wiring is still hot if you cut it with your FD chain saw. As some FD have learned the hard way (and at night our scenelights can light them up/make them hot).
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