problem programing renogy 40A for my system

We need assistance please.....
we have installed a 12 volt system
we live near Pittsburgh Pennsylvania
We used the following:

Solar Panels
290 watts Thunderbolt Magnum part no. 63585
amorphous silicone solar cells
and
110 watts of Nature Power solar panels
polycrystalline solar cells
model # 53110
for a total of 400 watts of solar panel array
connected to
Universal solar connector
Thunderbolt Magnum Solar 400 watt
universal solar connector
Part no. 68689
Batteries
Qty. (2) connected in parallel
Pionergy LiFePO4 12 volt 200 AH plus,
400 amp hour total with BMS. Deep Cycle
Inverter
Jupiter pure 2000 watt 12v
connected the two batteries with 2/0copper wire
the inverter is connected to the batteries with
2/0 copper wire protected by a 250 amp fuse
Solar Charge Controller
Renogy Rover Series 40A
MPPT Tracking Solar Charge Controller
the batteries are connected to the charge controller with 8 awg copper wire protected by a 50 amp fuse

we have a greenhouse and want to run a fan in the summer.
we cannot run all night without discharging the batteries
batteries discharge to 11 volts and cut off. Why
does it shut down when the batteries reach 11 volts?

what do we need to change???

Regards
Tom Corey irishcoreys@comcast.net

The batteries shut down at 11 volts because they are fully discharged and have no more power to give, it's not a great idea to keep discharging them like this as it will shorten their lifespan.

WelderWalt said:

Qty. (2) connected in parallel
Pionergy LiFePO4 12 volt 200 AH plus,
400 amp hour total with BMS. Deep Cycle
Inverter

Click to expand...

400 ah at 12 volts is 4800 watt-hours, this should be plenty of power to run a fan assuming you are getting these batteries fully charged. How much power is that fan of yours using? It's very likely you aren't fully charging those batteries during the day.

WelderWalt said:

290 watts Thunderbolt Magnum part no. 63585
amorphous silicone solar cells
and
110 watts of Nature Power solar panels
polycrystalline solar cells

Click to expand...

Combining different solar panels is a bad idea, you will lose a large amount of your potential power by doing this. Here's a great resource that explains it: https://www.altestore.com/diy-solar-resources/wiring-mismatched-solar-panels-video-series/ You're likely only getting 20 watts of power from that 110-watt panel but it depends on how you have them connected. How much power are you bringing in on a sunny day? I would estimate about 255 watts, assuming you're getting 5 full hours of sun 255 x 5 = 1275 watt-hours much less than you need to charge your battery.

they are deep cycle batteries and during the day they do charge to 13.2
I don"t know if one of my other components is configured wrong
please see my complete list of what I am using
Thanks

Yeah, 13.2 volts isn't fully charged, you should be seeing closer to 14.3 volts. You're probably using more power than you're bringing in. So again how much solar power do you bring in on a sunny day, and how much power are you using? The only thing off about your components is the "
Thunderbolt Magnum Solar 400 watt universal solar connector" I've never seen one of these or even seen one of the other forum members using them. This doesn't mean much though if I don't know how much solar power you're bringing in.

Your batteries have built in protection that's shuts the batteries off from discharging below a safe level.
Under charge expect the voltage to reach over 13.8 volts for an almost full charge.
it's difficult to find the full specification on your panels , and with the mismatch in power output its possible the power output from the controller will be lower than expected.
The Renogy controller can display values that would be useful to help identify possible problems.
It will display, panel voltage, charge current, battery volts, accumulated amp hours. It will also display battery capacity but this is an estimate and very inaccurate.
The power needed for the fans would be useful information.

There are numerous issues that may be causing the batteries to be not charging adequately, including the possibility of failed parts.

One possible investigation would be to connect the 290 watt panel alone and see if the controller output current improves.

Mike

What is the Nameplate watts of your fan? I agree with the others, your drawing too much power from your system. Basics.... what is the load and for how long? Your charge controller is it set up for LiFePO4 batteries or just plain Lithium.