panel for 130 amp battery

[Mike90250]

Adding in the inverter losses, of 20%, and a slight correction on your math: 310 watt hours, you will consume about 372wh daily.

If used in the sunny part of the day, the solar panel will provide some power directly, you may only need 100W of panels.

if at night, in the dark, you will need more panel, to compensate for battery recharge losses. 200W would be a good start.

For a 24 hour cycle, you need a battery with 800Wh storage, at 12V, that's a 66Ah battery. Common sizes are 50-90ah, so you should be OK. If you can't find a true DEEP CYCLE battery, 2, 6V golf cart batteries would work.

Don't use a car or truck battery, it will fail on you in a month. It needs to be a deep cycle battery.

You will also need a 3 stage charge controller. If it does not state 3-stage on it, don't get it.

If you expect a cloudy day, you need to double the battery size, so it does not sit discharged and get ruined. If you expect 2 or more cloudy days, you MUST get a grid power charger, to recharge the battery so it does not sit discharged. Going to an even larger battery, you gain nothing, because the solar will not be able to recharge it before the battery is ruined.

[jony lima]

Adding in the inverter losses, of 20%, and a slight correction on your math: 310 watt hours, you will consume about 372wh daily.

If used in the sunny part of the day, the solar panel will provide some power directly, you may only need 100W of panels.

if at night, in the dark, you will need more panel, to compensate for battery recharge losses. 200W would be a good start.

For a 24 hour cycle, you need a battery with 800Wh storage, at 12V, that's a 66Ah battery. Common sizes are 50-90ah, so you should be OK. If you can't find a true DEEP CYCLE battery, 2, 6V golf cart batteries would work.

Don't use a car or truck battery, it will fail on you in a month. It needs to be a deep cycle battery.

You will also need a 3 stage charge controller. If it does not state 3-stage on it, don't get it.

If you expect a cloudy day, you need to double the battery size, so it does not sit discharged and get ruined. If you expect 2 or more cloudy days, you MUST get a grid power charger, to recharge the battery so it does not sit discharged. Going to an even larger battery, you gain nothing, because the solar will not be able to recharge it before the battery is ruined.

thank u Mike
u r great. can u tell me what is 3 stage controller? and can i use seal acid battery for it?
thanks
jony

[Mike90250]

3 stage controllers have BULK, ABSORB and FLOAT modes.

Many good ones have selector switch for AGM, GEL or FLOODED batteries. Only Flooded batteries can be EQUALIZED.

Controller info http://www.windsun.com/ChargeControls/ChargeCont.htm

Morningstar makes a good line, as does Outback, and Xantrex
http://www.solar-electric.com/mochco.html morningstar products.

You have to read the fine print to make sure the controller you select, will do what you need.

Lots of cheap ones from China, but quality is unknown.

[jony lima]

thank u mike,
i learn about 3 stage charge controller. if i use deep cycle lead acid battery, is it mandatory to use 3 stage controller? another question is- i have a 5 watt small motor. can i run it with 8.2 amp sealed acid battery and charge with 10 watt panel?

thanks
jony

[Mike90250]

Read up on charge controllers here

http://www.windsun.com/ChargeControls/ChargeCont.htm

In a car, the battery generally does not get run down so much that it needs special attention to being recharged. but in off grid use, the batteries get cycled deep enough and often enough, that they greatly benefit from 3 stage charging.

As to the motor, you must first determine how much it will run, and then size the battery, and then the panel for recharging.

5 watts for 10 minutes a day, is very different than 5 watts for 18 hours a day
assume a 12V system, 5 watts is 0.41 amps

[jony lima]

Read up on charge controllers here

http://www.windsun.com/ChargeControls/ChargeCont.htm

In a car, the battery generally does not get run down so much that it needs special attention to being recharged. but in off grid use, the batteries get cycled deep enough and often enough, that they greatly benefit from 3 stage charging.

As to the motor, you must first determine how much it will run, and then size the battery, and then the panel for recharging.

5 watts for 10 minutes a day, is very different than 5 watts for 18 hours a day
assume a 12V system, 5 watts is 0.41 amps

yes Mike,
but which i tried to ask u that how long hours i can run my 5 watts motor consuming 50% discharge the 8.2 Amp battery. and can i charge the battery with 10 watt panel?
thanks
jony

[Mike90250]

5W / 12V = 0.42 amps
Run time till battery :
30% depleted 5.8 hours (5.74 amps remaining)
50% depleted 9.7 hours (4.1 a remain)
stop now and recharge
100% (0A remain, you have destroyed the battery, recycle and buy new one)

Because of battery losses and such, recharge with a 10 w panel, will take about as long as the 5w fan runs. That means, if you only have 5 good hours of solar light a day (this is very much shorter than dawn - sunset) you can only run the fan for 5 hours, or you will not be able to recharge fully the next day. After 2 days of not fully recharging, you destroy the battery, and it's going to be time to buy a new one.

[jony lima]

5W / 12V = 0.42 amps
Run time till battery :
30% depleted 5.8 hours (5.74 amps remaining)
50% depleted 9.7 hours (4.1 a remain)
stop now and recharge
100% (0A remain, you have destroyed the battery, recycle and buy new one)

Because of battery losses and such, recharge with a 10 w panel, will take about as long as the 5w fan runs. That means, if you only have 5 good hours of solar light a day (this is very much shorter than dawn - sunset) you can only run the fan for 5 hours, or you will not be able to recharge fully the next day. After 2 days of not fully recharging, you destroy the battery, and it's going to be time to buy a new one.

thanks
so do i need 20 watt panel? or battery of more Amps? i just want to run the fan 6 hours
jony