What happens when solar battery is depleted?

[user 36129]

Newbie question here, what happens when you've used all your stored battery power during the day and you switch to pulling off the grid,? I.e. do the solar panels charge the battery up while you pull off the grid, or, do your panels run the house when it can and only charge the battery once demand falls low enough that there is spare power being generated by the solar panels to charge the battery? We're getting a pylon us5000 battery with a solis 5kwh inverter for a 20 panel 7.4kwp system.

Any advice is appreciated

 

[Barx]

Systems can be setup in many ways. And different models of inverters have differing levels of flexibility.
Generally though, the battery will be charged by surplus generation that would normally be exported to the grid.

 

[binky]

Panels will supply the house and any surplus will be fed into the battery. If there's no surplus then battery remains flat and you pull any shortfall from the grid.

 

[user 36129]

Systems can be setup in many ways. And different models of inverters have differing levels of flexibility.
Generally though, the battery will be charged by surplus generation that would normally be exported to the grid.

Thanks. So if the battery is flat can the solar panels partially charge the battery and at the same time support some of the house usage? Or can the solar only do one thing at a time i.e. charge the battery or support the house?

 

[binky]

Thanks. So if the battery is flat can the solar panels partially charge the battery and at the same time support some of the house usage? Or can the solar only do one thing at a time i.e. charge the battery or support the house?

Normally works as house first, batteries only if there's surplus energy not being used in the house. No point charging up battery if the energy can be used straight from the panels.

 

[Andy1733]

Thanks. So if the battery is flat can the solar panels partially charge the battery and at the same time support some of the house usage? Or can the solar only do one thing at a time i.e. charge the battery or support the house?

Neither of these in reality
Eg. If your panels are producing 3kwh and your house is consuming 2kwh. The other 1 kWh will charge the batterys.

If your panels are producing 3kwh and your house consumption is 2kwh, your battery are full the 1 kWh goes back to the grid.

If your panels are producing 2kwh and your house usage is 2kwh nothing goes to the battery or grid.
Don't forget your inverter is reading the power input/output several times a second to send the power where it's needed.

 

[user 36129]

Neither of these in reality
Eg. If your panels are producing 3kwh and your house is consuming 2kwh. The other 1 kWh will charge the batterys.

If your panels are producing 3kwh and your house consumption is 2kwh, your battery are full the 1 kWh goes back to the grid.

If your panels are producing 2kwh and your house usage is 2kwh nothing goes to the battery or grid.
Don't forget your inverter is reading the power input/output several times a second to send the power where it's needed.

Great, thanks for the info

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