Hi folks,
After coming across this forum and reading though a lot of posts i think i have finally worked up the courage to ask for advice for a proposed off-grid solar setup (although it could be considered RV i guess).
From my reading it seems that when you are looking at solar on a budget you need to look at the trinity of size, storage, price and then pick any 2. I have picked size and price.
The whole setup would be mounted on a roofrack of a 4WD so weight, portability and efficiency are a consideration in design.
After looking throughout the forum regarding inverters i have decided that i would like to avoid using the word "BOOM" to describe what i have in mind and will be going down the 24v route.
I am looking at a 2000w inverter to run a load of 1400-1700 watts (240v @ 6 or 8 amps AC). The load does not need to run all of the time and i would like it to run according to the health of the batteries - for example, Solar panels charge the battery to full - inverter kicks in to run the load and discharges the batteries to 80% (or whatever the ideal DOD is for the battery type) then disconnects the load until charged again. It would also be utilised in emergency situations as a backup power source however this is not a huge item as the load will be far less.
For the batteries I am looking at either lithium or AGM but would like them not to exceed 50-60kg - as i said before the load does not need to run for a long time but as/when it can. From my understanding for the load i am running it is between 66-88 amps DC so i am hoping having 200 (or even 300) ah batteries will be able to do the job safely (the load runtime is not a huge thing but i would like it to be more then 20 seconds and also to avoid the BOOM factor keeping batteries healthy for as long as possible).
The next part i am not sure if it is necessary or not but i would like to put in a low voltage disconnect between the inverter and the battery so it does the disconnect.
A solar controller would sit between the battery and the solar panels (MPPT charger).
There would be 2 permanent solar panels mounted with as much wattage as i can get out of them for their size (about 1600x1600mm is the space/size).
A future secondary consideration is that it is expandable on demand - for example when going camping i can plug in extra panels into the array and add to the charge, then once the trip is finished disconnect the extra panels and go home. The future panels will probably be a different wattage so i am not sure if i add them as a different string or use a combiner of some description (or another controller?).
Probably the biggest reason i am considering this is because we get a lot of sunlight where i live (northern end of Australia - minimum of 5 peak hours per day but can be up 7 depending on the month). The downside is that temp can be high (30-37 C).
The whole setup would be well ventilated and a couple of DC fans would help with cooling the batteries and inverter if needed).
Sorry for the longish post but i would like as much accurate advice as i can get and the help is very much appreciated.
After coming across this forum and reading though a lot of posts i think i have finally worked up the courage to ask for advice for a proposed off-grid solar setup (although it could be considered RV i guess).
From my reading it seems that when you are looking at solar on a budget you need to look at the trinity of size, storage, price and then pick any 2. I have picked size and price.
The whole setup would be mounted on a roofrack of a 4WD so weight, portability and efficiency are a consideration in design.
After looking throughout the forum regarding inverters i have decided that i would like to avoid using the word "BOOM" to describe what i have in mind and will be going down the 24v route.
I am looking at a 2000w inverter to run a load of 1400-1700 watts (240v @ 6 or 8 amps AC). The load does not need to run all of the time and i would like it to run according to the health of the batteries - for example, Solar panels charge the battery to full - inverter kicks in to run the load and discharges the batteries to 80% (or whatever the ideal DOD is for the battery type) then disconnects the load until charged again. It would also be utilised in emergency situations as a backup power source however this is not a huge item as the load will be far less.
For the batteries I am looking at either lithium or AGM but would like them not to exceed 50-60kg - as i said before the load does not need to run for a long time but as/when it can. From my understanding for the load i am running it is between 66-88 amps DC so i am hoping having 200 (or even 300) ah batteries will be able to do the job safely (the load runtime is not a huge thing but i would like it to be more then 20 seconds and also to avoid the BOOM factor keeping batteries healthy for as long as possible).
The next part i am not sure if it is necessary or not but i would like to put in a low voltage disconnect between the inverter and the battery so it does the disconnect.
A solar controller would sit between the battery and the solar panels (MPPT charger).
There would be 2 permanent solar panels mounted with as much wattage as i can get out of them for their size (about 1600x1600mm is the space/size).
A future secondary consideration is that it is expandable on demand - for example when going camping i can plug in extra panels into the array and add to the charge, then once the trip is finished disconnect the extra panels and go home. The future panels will probably be a different wattage so i am not sure if i add them as a different string or use a combiner of some description (or another controller?).
Probably the biggest reason i am considering this is because we get a lot of sunlight where i live (northern end of Australia - minimum of 5 peak hours per day but can be up 7 depending on the month). The downside is that temp can be high (30-37 C).
The whole setup would be well ventilated and a couple of DC fans would help with cooling the batteries and inverter if needed).
Sorry for the longish post but i would like as much accurate advice as i can get and the help is very much appreciated.
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