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Post by petemate on Apr 13, 2019 5:32:19 GMT
I have recently bought a small off grid 2nd hand, to run my swimming pool pump when the sun is shining.
It consists of 4 panels, an inverter/charger and 2 - 200 amp hour batteries.
However I think the batteries are knackered.
Is there a way I can run this system without batteries. Maybe by using a different type of controller?
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Dave Simmo
Junior Member
Recovering from Surgery. Shoulders had to be rebuilt. End Stage joint damage
Posts: 76 
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Post by Dave Simmo on Apr 22, 2019 23:22:13 GMT
200 amp hr Battery's are nice too bad they are cooked, I dont think the panels alone will do what you want, even with a high dollar CC i think it asking alot from the panels . I can go ahead an ad my 2 cents. Keep it low on cost and test a rebuilt battery out. Most of the states have businesses that rebuild them and truth be told they are not bad,
All that being said it will most likely be the amp consumption it should be on the pump. Then is the pump 12 volt? What volt output on the panels? You already have the system test a setup (The Pump with the panels on a sunny day) I hope this helps please keep us informed on how it went
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Johann
Junior Member
Posts: 56
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Post by Johann on Jul 22, 2019 3:28:51 GMT
I have recently bought a small off grid 2nd hand, to run my swimming pool pump when the sun is shining. It consists of 4 panels, an inverter/charger and 2 - 200 amp hour batteries. However I think the batteries are knackered. Is there a way I can run this system without batteries. Maybe by using a different type of controller? Johann here. There is more info needed. Watts and volts from panels. Inverter watts and voltage needed , maybe name etc etc.
There is a way, but it is difficult to match the pump amps and watts to the panels wattage since the sun is moving in the sky which makes the matching more difficult . The inverter shuts down if the voltage is to high or to low, so a voltage sensitive switch has to switch the inverter off and on , not letting the inverter to do so otherwise you will have to reset the inverter manually.
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Johann
Junior Member
Posts: 56
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Post by Johann on Jul 22, 2019 3:45:00 GMT
How do you know the battery is toast?
Here again, how many watts does your pump has and how many watts do your panels have. How many amps/watts do your panels put out? And how many amps are going to your battery?
How many amp hours for how many DC volts of your battery?
Your panels need to produce more watts to A) power your pump motor and to B) charge your batteries.
If you have 200 amp hours at lets say 12 volt DC that is 2400 watt hours......but you can only use 50% of that if you want the batteries to have a normal live span and that is 1200 watt hours per day. If your pump uses 1000 watts than your battery is only good for 1.2 hours after optimum sun. If your pump uses 1000 watts then your panels need to put out about 1500 watts to get that power to the battery after all the losses. Now in order to run the pump and to charge the battery, you would need more panel watts to do both.
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