Solar daytime PV use for swimming pool. Can we do without the battery?

[zed]

The aim of the game:
Run a 900W 220V swimming pool pump, during the day, in summer, in the south of France.

Considering the price of the batteries, I tell myself that for a use in phase with the sunshine, we could try to do without them.
Is it just stupid to install 900W of PV and plug them into a DV12V to AC220V converter "surge protected"?
Knowing that the PV is not really going to be in 12V but rather in 18V, will the converter switch to PLS so as not to burn out or will it manage to dissipate the overflow in Joule effect?

If the converter cannot be plugged directly into the PVs, will a charge controller protect it even if there is no battery?

[ENERC]

The aim of the game:
Run a 900W 220V swimming pool pump, during the day, in summer, in the south of France.

Considering the price of the batteries, I tell myself that for a use in phase with the sunshine, we could try to do without them.
Is it just stupid to install 900W of PV and plug them into a DV12V to AC220V converter "surge protected"?
Knowing that the PV is not really going to be in 12V but rather in 18V, will the converter switch to PLS so as not to burn out or will it manage to dissipate the overflow in Joule effect?

If the converter cannot be plugged directly into the PVs, will a charge controller protect it even if there is no battery?

With that for example https://www.wattuneed.com/fr/nos-kits-s ... 1-2:20-4:1 you will cover up to 500 W on the 900 W of the pump.
If you want to cover the 900 W, put in two and connect the micro-inverters directly to the switchboard of the technical room of the swimming pool.
There are plenty of other sites that sell these kits.

[Christophe]

No, you will need at least one buffer battery to stabilize the voltage at the input of the DC AC converter ... you cannot make a direct wiring otherwise the converter will go into safety (> 15 V panel output).

An old 40-50Ah lead-acid battery that is not too tired should suffice.

Be careful, pumps do not like modified sine wave inverters. A 1000W true sine wave converter is quite rare and costs € 400 ...

Also pay attention to the starting peak ... 900W is already a big pump ...

[Christophe]

If you want to cover the 900 W, put in two and connect the micro-inverters directly to the switchboard of the technical room of the swimming pool.

Micro inverter 500W for connection to the network. so if no network, it doesn't work ...

Otherwise it's a good price <1 € / Wc all inclusive!

[thibr]

the state of the art is to put the PV installation in self-consumption to supply the swimming pool and the rest of the house with it and to send the surplus to the water heater with a router
https://forum-photovoltaique.fr/viewtopic.php?t=41307
http://forum-photovoltaique.fr/viewtopi ... 18&t=39159
https://github.com/Jetblack31/EcoPV
there is a kit ~ 85 € ready to install in the elec board

[Christophe]

Interesting but inaccessible for 99% of people ... have you seen the electronic manipulations to be done?

Which kit?

[izentrop]

Hello,
It is a kind of system for automatically shedding photovoltaic surpluses to an ancillary load so as not to send it to the network, it does not correspond to the luxurious and anti-ecological request made here, right?

[phil59]

No worse than driving a thermal vehicle!