Originally posted by longstate
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Rain Barrel Pump Setup
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Originally posted by SunEagle View Post
A quick rule of thumb for charging any lead acid battery is to have a C/12 to C/18 charge rate. Where C = Ah rating of the battery. So a 35Ah battery needs about 3 amps to 4.4 amps of charging and most 80 watt panels will provide about 4 amps at best.
We will see how it goes. I'll post the results later for people's future reference!Leave a comment:
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Originally posted by longstate View Post
Thanks! That's just the type of information I was looking for. Looks like upsizing to the 35Ah battery and 80 watt panel would probably only be ~$80 more. Although the cost of a new 18Ah battery is only $35. So I guess there's probably a balance in there.Leave a comment:
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Originally posted by SunEagle View PostThat 12V pump will draw 3 amps so basically 36watts. With the 18Ah battery you will be able to run the pump maybe 1 1/2 hours a day which calculates to about 250 gallons (without any losses). That may or may not be enough water for you.
To be safe I would go with at least a 35 Ah battery and and 80 watt panel otherwise you may end up killing that battery sooner then you want to.Leave a comment:
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That 12V pump will draw 3 amps so basically 36watts. With the 18Ah battery you will be able to run the pump maybe 1 1/2 hours a day which calculates to about 250 gallons (without any losses). That may or may not be enough water for you.
To be safe I would go with at least a 35 Ah battery and and 80 watt panel otherwise you may end up killing that battery sooner then you want to.
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Rain Barrel Pump Setup
Hello, I was looking to design a small DC pump setup for my rain barrel system (4 55-gallon barrels). However, the more I looked into things, the more confused I became, so I thought I'd ask for some guidance!
This project is half for fun and half because I don't want to have to run power out to this system. We just need a small pump to get the water from our barrels to the flowers around the house a couple times a week (assuming there is enough water). My original thought was the following system:
2.8gpm 12V pump
18Ah AGM battery
20W panel
Charge Controller
However, after more research, I'm not sure if I have enough Ah in the battery, or a big enough panel to keep it charged above the 50% level (in Chicago BTW). Does this seem reasonable or am I low on the battery and panel size?
Thanks!!
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