solar system that charges batteries in 4 is impossibe ?

[SunEagle]

i meant 2 batteries 200amps 12 volt 200amp 24vdc battery and c/5 of 40 amps which is suitable to work on 4 panels of 250 watt 24vdc nominal

using mmpt my batteries will eat 40amps from the production of 4*250=1000 wattt panels

now if we divide 1000 watt /24 = 40 or so


1000 watt will be more than enough to run 200 watt fridge and 500 wat air conditioner

The fridge yes. The A/C unit maybe or maybe not. The compressor on those units may have a very high starting draw which could drop the 24v battery low enough to shut down the inverter.

[gendil]

3 200ah. batteries,.. sounds like 12 volt batteries. Unless you are building a 36 volt system this is a bad choice.
5, 250 watt panels, not a good number. You only have two choices to wire them ALL in parallel, or ALL in series, Too high voltage unless you have a high voltage MPPT controller.

i meant 2 batteries 200amps 12 volt 200amp 24vdc battery and c/5 of 40 amps which is suitable to work on 4 panels of 250 watt 24vdc nominal

using mmpt my batteries will eat 40amps from the production of 4*250=1000 wattt panels

now if we divide 1000 watt /24 = 40 or so


1000 watt will be more than enough to run 200 watt fridge and 500 wat air conditioner

[RenewablesRock]

[QUOTE=littleharbor;n381474]

You can combine with with series and parallel for eat set of 2 panels. What's wrong with that?



Nothing at all but what are you going to do with the 5th panel? Set it aside till you get a 6th panel?

Yeah, that causes a problem. That's why I ordered everything in pairs.

[littleharbor]

[QUOTE=RenewablesRock;n381472]

You can combine with with series and parallel for eat set of 2 panels. What's wrong with that?



Nothing at all but what are you going to do with the 5th panel? Set it aside till you get a 6th panel?

[RenewablesRock]

3 200ah. batteries,.. sounds like 12 volt batteries. Unless you are building a 36 volt system this is a bad choice.
5, 250 watt panels, not a good number. You only have two choices to wire them ALL in parallel, or ALL in series, Too high voltage unless you have a high voltage MPPT controller.

You can combine with with series and parallel for eat set of 2 panels. What's wrong with that? For each pair I put wire in series, I get nearly 90 volts and up to 16 amps. I could just keep putting those pairs to increase the amps. Would just need more charge controllers. An order for a Midnite Solar charge controller(s) sounds like it would be in order.

[littleharbor]

i cant get same type of battery ,,,,so i cant increase the batteries besides ...they are 3 years old now ....looks like i have to build new system with 3 agm 200amps batterys + 5 250watt panels +mppt controller 24/48 volt


this system will produce 1.25kwatt /hour and thus will be able to power small refgrirator and ac .....i may be forced to turn off the ac once it is dark but can easily power up the refrigrator some small refrigrfators consume as low as 200 watt

3 200ah. batteries,.. sounds like 12 volt batteries. Unless you are building a 36 volt system this is a bad choice.
5, 250 watt panels, not a good number. You only have two choices to wire them ALL in parallel, or ALL in series, Too high voltage unless you have a high voltage MPPT controller.

[RenewablesRock]

Maybe you should search for "awning" mounting hardware. Solar panels are basically the same thing as an awning in those pictures and that type of hardware needs to withstand high wind shear conditions.

Yeah, that's a good idea. Maybe I'll check on that. Thanks for the tip!

[RenewablesRock]

i cant get same type of battery ,,,,so i cant increase the batteries besides ...they are 3 years old now ....looks like i have to build new system with 3 agm 200amps batterys + 5 250watt panels +mppt controller 24/48 volt


this system will produce 1.25kwatt /hour and thus will be able to power small refgrirator and ac .....i may be forced to turn off the ac once it is dark but can easily power up the refrigrator some small refrigrfators consume as low as 200 watt

Yeah, three 200 Ah AGM batteries are big bucks. But yeah, that would be awesome to run a fridge. I've been watching a lot of YouTube videos of people living in vans running 12V refrigerators off of the solar panel(s) on their roof with like a 100 Ah battery. Amazing stuff.

Yesterday I watched a video where this couple lived out of a 2008 Sprinter van. Then they went to Mexico and the engine died. They paid $1600 for the inverter, batteries and charge controller. Their solar panel was free from a friend. They do a lot living off the grid with that solar set up.

Here's their story:

https://www.youtube.com/watch?v=ZFnb5qwecJw

[gendil]

Adding that 3rd panel may also add another 8 amps to your battery charge which could hurt even an AGM type battery. It really depends if you get 24 charging amps or some lower percentage but once you go above 16 amps you also may increase the charge rate faster then a C/6.

If you need more panel wattage to run your AC system then you might need to increase the battery Ah value to accommodate the additional charging amps.

i cant get same type of battery ,,,,so i cant increase the batteries besides ...they are 3 years old now ....looks like i have to build new system with 3 agm 200amps batterys + 5 250watt panels +mppt controller 24/48 volt


this system will produce 1.25kwatt /hour and thus will be able to power small refgrirator and ac .....i may be forced to turn off the ac once it is dark but can easily power up the refrigrator some small refrigrfators consume as low as 200 watt

[SunEagle]

I am in the middle of doing long term tests with my two 310 watt panels in the back yard. I am waiting to get price quotes so I can mount these on the wall, if possible. My panels are 77-1/2 long and 39-1/4 wide. Anyone know if any good, strong wall mounts I could get for these?

Any time I go to Amazon or eBay and search on "Solar Panel Wall Mount", I find nothing of value. But I see people doing these because I've seen pictures elsewhere. See the photos below of people that have done what I am trying to pull off. So I know what I am trying to do is not unreasonable. I have my panels on saw horses in the attached pic in the yard temporarily until I can find the proper wall mount kit. Once I mount them on the walls, then I can buy the combiner box, lightning arrester, power on/off box, etc and make it all look professional.

Maybe you should search for "awning" mounting hardware. Solar panels are basically the same thing as an awning in those pictures and that type of hardware needs to withstand high wind shear conditions.

[RenewablesRock]

I am in the middle of doing long term tests with my two 310 watt panels in the back yard. I am waiting to get price quotes so I can mount these on the wall, if possible. My panels are 77-1/2 long and 39-1/4 wide. Anyone know if any good, strong wall mounts I could get for these?

Any time I go to Amazon or eBay and search on "Solar Panel Wall Mount", I find nothing of value. But I see people doing these because I've seen pictures elsewhere. See the photos below of people that have done what I am trying to pull off. So I know what I am trying to do is not unreasonable. I have my panels on saw horses in the attached pic in the yard temporarily until I can find the proper wall mount kit. Once I mount them on the walls, then I can buy the combiner box, lightning arrester, power on/off box, etc and make it all look professional.

[SunEagle]

instead of open new thread i have this system 2 24volt 250 watt solar panels pwm conroler system and 100 amp 24vdc battery agm can i add one more panel to reach to the 600 watt cause this system
is only 400 watt due too pwm controoler so now if i make it to 600 watt adding yet 3th panel each panel have 8 amps so i be exately at c/4 of my battery capacity wwont that damage my syetem? i need to be at 600 i have small window air condition that eats around 460watt and living in country of too much sun and too much power black out

will it work ?

Adding that 3rd panel may also add another 8 amps to your battery charge which could hurt even an AGM type battery. It really depends if you get 24 charging amps or some lower percentage but once you go above 16 amps you also may increase the charge rate faster then a C/6.

If you need more panel wattage to run your AC system then you might need to increase the battery Ah value to accommodate the additional charging amps.

[gendil]

instead of open new thread i have this system 2 24volt 250 watt solar panels pwm conroler system and 100 amp 24vdc battery agm can i add one more panel to reach to the 600 watt cause this system
is only 400 watt due too pwm controoler so now if i make it to 600 watt adding yet 3th panel each panel have 8 amps so i be exately at c/4 of my battery capacity wwont that damage my syetem? i need to be at 600 i have small window air condition that eats around 460watt and living in country of too much sun and too much power black out

will it work ?

[Sunking]

FLA = Flooded Lead Acid or Wet Battery
AGM = Absorbed Glass Mat another form of lead acid battery.

[gendil]

I also have "big" portable system. It includes a 12v 200Ah battery system, about 420watts of panels (3 x 80 & 2 x 90), 30 amp PWM CC, 600 watt inverter.

Here are a few pictures of that one. Although it only shows 4 panels but the combiner box was designed for 5.

I spent about $2500 for this system and could have saved $1000 by going with 2 x 6v 232Ah FLA batteries instead of 4 x 12v 50Ah, and 2 x 200 w panels instead of the 5 < 100w.

Big mistake to build the system like I did but again I did not listen to the experts on this forum before I purchased that hardware.

what is fla? battery? from the replies on my post i deduce that one have to buy batteries the can accept higher charging currents

they will allow you to buy more panels than batteires ...thus charging time is reduced and the higher cost of batteries is eliminated

the panels will be larger than the batteries and thus you can enjoy free power as long as strong sun light is there

the only draw back is that once in the sunset you can not enjoy much of power since all is left is small charged batteries(relatively speaking)