250w 30v solar panels

[Bala]

hi, the batteries are 12 v. anyway a bought a 30amp charge controller so i will do 3 panels in parallel so it will be a 24v 25amp array and do 2 x 100ah batteries in series, can i use the load connection on the charge controller for my 12v 300w inverter in the day time? will get a 24v inverter later ,the charge controller accepts 24v and 12v batteries but i can do 750w from the solar array if i do the 24v series charge config.

The load terminlas on CC are not for inverters,

Did you get a 24V inverter?

[almac]

What is the output?

the batteries where almost fully charged but the output was about 26-27v 6amps, the apms went down as the batteries charged

[almac]

The load terminlas on CC are not for inverters,

Did you get a 24V inverter?

not yet, using 12v 300w inverter off one of the 12v batteries

[Bala]

not yet, using 12v 300w inverter off one of the 12v batteries

That will cause the battery to fail quickly as they cannot charge properly with draw off one like that.

[almac]

That will cause the battery to fail quickly as they cannot charge properly with draw off one like that.

its not drawing all day so it will charge when im not using it

[Bala]

its not drawing all day so it will charge when im not using it

It will not charge properly,

when using 2 x 12V batteries you cant draw 12V off one, it just does not work.

In trucks if you have a 12V UHF radio connected to one battery that battery will fail, a 24 to 12 reducer is used.

You need that 24V inverter.

[almac]

It will not charge properly,

when using 2 x 12V batteries you cant draw 12V off one, it just does not work.

In trucks if you have a 12V UHF radio connected to one battery that battery will fail, a 24 to 12 reducer is used.

You need that 24V inverter.

ok i will get a dc converter, alot cheaper. thanks for your help

[Bala]

ok i will get a dc converter, alot cheaper. thanks for your help

No you cant use a 24 to 12 reducer for running your inverter, they are for small loads only.

You either need to charge and discharge your batteries at 12V or 24V,

You cant charge at 24v in series then just discharge one at 12V like you wrote but removed.

You either need to get a 24V inverter or a decent CC like sunking suggested so you can run your 12V inverter.

You rushed out and bought stuff at a stressful time, and are now getting an idea of how much it costs to set up a system so you can get some decent battery life.

You need to take a step back and decide whaty you want to acheive and how you can get the best result out of what you have.

[almac]

No you cant use a 24 to 12 reducer for running your inverter, they are for small loads only.

You either need to charge and discharge your batteries at 12V or 24V,

You cant charge at 24v in series then just discharge one at 12V like you wrote but removed.

You either need to get a 24V inverter or a decent CC like sunking suggested so you can run your 12V inverter.

You rushed out and bought stuff at a stressful time, and are now getting an idea of how much it costs to set up a system so you can get some decent battery life.

You need to take a step back and decide whaty you want to acheive and how you can get the best result out of what you have.

oh, how many amps does a 300w 12v dc inverter draw in dc? is 300/12 =25amps ok bugger. so another $270 for a 24v 300w inverter, so this will be ok to discharge my 24v battery config at the same time as charging it? problem with the CC sunking suggested is its about $1,100 au, dont need it right now. the generator can handle the big loads. got these panels cheap. added another this morning, so now its 3 in parallel getting 27.3v out of the CC. amps b4 the CC at 8am with 3 was 11amps. 9.30am 15amps

[Bala]

yes with a 24V inverter you can charge your batteries .

Make sure the 24V inverter is pure sine wave.

Your free power you talked about early on has vanished.

[almac]

yes with a 24V inverter you can charge your batteries .

Make sure the 24V inverter is pure sine wave.

Your free power you talked about early on has vanished.

its still free, the expenses to set up are for ASSETS. its not money pissed up against the wall like a power bill, also what can you run from the load terminal. the batteries are nearly charged and its only 10am.

[Bucho]

problem with the CC sunking suggested is its about $1,100 au, dont need it right now.

None of us including I expect you know what CC you actually need. He's just pointing out the CC you'd need to use all your panels in a 24v system. So how much power do you actually use in a day?

[Sunking]

its still free, the expenses to set up are for ASSETS. its not money pissed up against the wall like a power bill, also what can you run from the load terminal. the batteries are nearly charged and its only 10am.

You will figure out in two or three years when you replace the battery, it is far more expensive than the utility.

[Bala]

its still free, the expenses to set up are for ASSETS. its not money pissed up against the wall like a power bill, also what can you run from the load terminal. the batteries are nearly charged and its only 10am.

Nothing is for free, not even this advice as I am just someone on a forum. IMO any advice posted on a forum should be explored further online to be verified before putting into practice. So spend some time and learn about stand alone solar systems, battery care etc etc.

if you do the sums on the cost of each KWH of electricity that you will get for the life of this system you will find you are paying way more than grid price.

How do you know your batteries are almost charged? The volts/amps readings only tell you part of the story. You will need a hydrometer at a minimum to to know where you batteries are at. If you dont learn how to properly understand your battery SOC you will likely ruin them in a very short time.

The load terminal should have a rating in amps, or you can run a relay off it and run more items. It may have some timer off/on functions.

[almac]

You will figure out in two or three years when you replace the battery, it is far more expensive than the utility.

in the US at 10ckw/h sure. in AU nearly 30ckw/h not as expensive. but for reliability no comparison