Please help improve my water pump

[SunEagle]

How can you prevent a battery from draining to shutdown? Some controllers have a function to prevent this?

Most charge controllers will turn off the battery at a voltage below 11V which is not good. There are other external Low Battery Relays that can be programed higher which will help extend the batteries life.

[MadnessGrid]

How can you prevent a battery from draining to shutdown? Some controllers have a function to prevent this?

[Mike90250]

You need both more battery and to recharge it, more panel.

Our question is, How many cloudy days to you need this to run for ? Generally systems are designed for 2-4 days of clouds, and day 3, the generator is started so as to not overly deplete the battery. If you say 8 days, you will need a much much larger system.

8 watt pump That would not need a very large inverter, a 50W inverter is about the smallest you can get. For things using a motor, you should use s pure sine wave inverter, it allows the pump to run cooler. High wattage inverters (over 300w) will self-consume more power internally, than your pump does. Replacing your inverter with a high efficiency pure sine wave, may be all you need to do.

8 watts x 24 hours = 192 watt hours
50ah battery @ 12V = 600 watt hours stored, 50% are usable. If you have already drained the battery to shutdown, several times, the battery has had it's lifetime shortened quite a bit, so start the budget for a replacement battery

To get a solid 3 days, you need 1200 watt hours of battery, if you don't want to damage the battery on day 3.

I don't know how to start a new topic on this website, so I'm so sorry for making a reply here that starts a new topic. Can anyone please help me?

I have an 8W 240V water pump that needs to work 24/7. So far what I only have are 100W panel, solar charge controller, 50A 12V deep cycle battery, and inverter. What I have will only last me 3 days max. Is there a way to add/change some parts to make the pump fully function 24/7 without failure? (the less costly, the better)