Solar Aerator wiring, off grid for my trout!

[Louieoffgrid]

Hi Everyone, Ive been lurking on this forum for quite a while and I'd like to thank everyone in advance for their knowledge and expertise - and for the kind help.

So this is what I'm doing, I have a small lake that I will be running 2 small aerators to keep an open area for the trout - to help them through the winter. This is the equipment I have.

2X thernova 500W TS-SW66 panels, VOC 45.43, Short Circuit 13.85, VMP 37.41, MPP 13.37, max sys voltage 1500, max rated fuse current 25

Inverter. WZRELB Reliable Design Pure Sine Wave Inverter DC to AC 24VDC Input 120VAC Output Off Grid Backup Power Supply Power Converter, (RBP60024B1). https://www.amazon.ca/dp/B078MPY477?...fed_asin_title

Controller. Solar Charge Controller 80A PWM 12V 24V 1920W Solar Panel Charger Discharge Regulator with 5V. https://www.amazon.ca/dp/B083KN9H22?...fed_asin_title

Battery protector. Victron Energy BatteryProtect 12/24-Volt 65 amp

4 x 6V costco golf cart batteries wired to 24V ...trojan t105 knock offs.

So my goal is to run a 55w and 18w aerator for as long as I can during the course of a day in the winter. Im in Ottawa Ontario Canada area.

I was planning on using the Victron BP switch to simply shut down the inverter when the batteries hit a min voltage so I dont fry them--(freeze). But upon more research I see that the victron BP wont like being shut down and reconnect daily .

So is there an option for a low voltage cutoff I can use?

I do have 110v timers I can plug into the inverter to control the amount of time I run the aerators but Id like to run them to the max to keep the ice off.

Thoughts?

Many thanks.

Loui

[chrisski]

My thoughts are to get a grid zero inverter to autamitcally cut over the power.

SunKing has some great stickies that explain design like number of days for battery backup weather conditions and latitude and how that goes to system design. I live in the best place for solar, AZ, but in Oregon where its cloudy, the same system may need to be 7 times as big.

Do you have a Kilowatt reading from this equipment for an energy audit.

[Louieoffgrid]

Perhaps this is my best option?

https://windandsolar.com/smart-battery-saver-shutoff/

Chrisski, i know what you mean about the system design but I just cant put too much money into it - its in the middle of no where, so...this is the equipment I have and the equipment I have to use basically. I used a similar system last year with no cutoff and it actually worked very well but on the real cold days the batteries froze....slightly lol, but still managed to survive and I resurrected them somewhat with a desulfater. To really run the system I want I need 8kw of panels and a monster battery pack - but that would be bigger than what I have at my cabin

[chrisski]

You do have a good plan that really just relies on switching over.

If you want a lot of help go to diysolarforum.com.

Manual switches don't work for me. I only forget that type of stuff once a year, and that's when I find my batteries drained. These are lithiums are cery forgiving of reaching the cutoff voltage.

For the auto switch you talk about, I'm not sure. You're really looking for some sort of auto transfer switch that can be set with voltages. I don't know much about the switch you listed. I know that I would forget once to check the settings and that's when the batteries could die.

[Bala]

I have a couple of the victron battery protect. Voltage set points are user programmable, it will do what you want.

[Louieoffgrid]

I have a couple of the victron battery protect. Voltage set points are user programmable, it will do what you want.

Does your system cut out from low voltage often? Mine could be cutting out every day or every other day.
thanks!

[Bala]

Does your system cut out from low voltage often? Mine could be cutting out every day or every other day.
thanks!

They rarely cut out. They are there as I have lithium batteries and I have them set to cut out before the internal bms.

How often they cut out will depend on your set point.

if you used an ac cut out the inverter will still be drawing enough to completely drain your battery. The BP will only have a few milliamps of self consumption.