Offgrid system for water pump and air pump

[D BAR]

Hello, I'm very new to this but I'm looking for a cost-effective way to power a water pump and air pump. I was looking into solar generators but I don't think it will work for me based of what I've been seen.

Figures:

water Pump 1.5hp	850 watts max	12 hrs per day
air Pump	150 watts	12 hrs per day
Smart Phone recharge	6 watts	3 hrs per day
Laptop recharge	100 watts	4 hrs per day

I get an average of 7 hours sun per day and I want to have 3 days reserve power.

Do I need an:
inverter 3kw 24v
battery 24V (2* 24V 100AMP) 7200wh
panels 2000 watts 5.5hrs charge time
controller 135amp
monitor

From my calculation I can only have 6.5 hours in reserve power. If I connect more batteries to increase this would i have to modify anything else?

 

[Rednecktek]

Just a few quick thoughts:

7 hours of sun isn't the same as USABLE sun, most people figure 4-5 hours of good usable sun unless you're in the tropics.

Why is your water pump running for 12 hours a day? Do you not have pressure tanks? Are you circulating a lake?
The startup surge on that well pump is probably somewhere in the neighborhood of 5Kw which is likely going to trip out your inverter when it kicks on. You can use a 3Kw inverter if it's a low frequency version but you're going to have to factor in for higher standby consumption and lower efficiency.

You're going to have a hard time finding 125a SCC's, you'll either need to step up to a 48v system or get multiple SCC's running in parallel.

Quick math check so far:
Water Pump (12000wh) + air pump (1200wh) + phone (18wh) + laptop (400wh) * 80% efficiency = 13618wh * 80% efficiency = 16342wh/day * 3 days = 49024wh of capacity.

49024 wh of capacity /24v nominal = 9805w of solar panels to recharge in a 5 hour good sun day. Round up to 10kw

10000w of solar panel / 24v nominal = 416a of SCC to recharge the battery bank in a day.

49kwh of battery / 24v nominal = 2042Ah of battery capacity of LFP or 4100Ah of lead acid, or 10 200Ah 24v batteries.

So, looks like your math came up short mostly on recharging that 3 days of battery bank in a single usable day of sun, and not taking efficiency into account. Going to a 48v system will save you a LOT when it comes to charge controllers and cost of batteries. Running such a large pump for 12 hours is really killing you though, definitely look at a smaller way to move the water around if possible.

Just my initial thoughts.

 

[D BAR]

Hi there, i'm in the tropics and the range for my country is 7.4-8.9 per day.

I want to power a hydroponic system and the pump I saw was https://www.amazon.com/WaterRebirth-12000GPH-Listed-Submersible-Water/dp/B09YPRVQ9H?th=1

It's a NFT system which usually runs 24/7 but i planned to go 30mins on 30mins off to save on electricity.

Even with the sunlight I'm still missing a lot of batteries. It seems like it would be cheaper to get a solar pump and aerator and have them run separately. What I could do is buy a solar generator and make sure to have a large tank to gravity feed nutrients on cloudy days.

I really don't want too much on the initial set up but i will definitely buy whats necessary as it progresses.

 

[D BAR]

Alright so I made some adjustments:

Water pump 520w @12hrs per day
aerator 50w @12hrs per day
battery capacity = 6840wh * 3 days reserve = 20,520
@ 80% eff. 24,624wh

At 570w * 6 startup surge = 3,420w
My inverter would need to handle 3.4kw (I plan to get the 6.5kw 48v because I would want to upgrade in the future)

I would need battery 24.624wh worth of batteries and panels 4104w of solar panels at 6 hours sun. (85.5a controller)

To get my system started I would probably just buy 8.21wh of batteries and 1400w panels and gradually increase. (30a controller)