G’day fellas,
I’ve been drawing up a circuit in my iPhone notes for the solar circuit I want to put in the house I am going to build. I have only put together an off-grid solar system once before for my parents’ house, but it was much smaller. My parents’ house has a 3000w array with a 100v/50a MPPT, a 3000w inverter, and 8 6v 232ah deep-cycle lead acid batteries. As to the brands and other details I cannot remember because I put the system in years ago. I’m not an electrician or anything, I have worked in construction and now work in another field. Basically, I am just saying that I don’t proclaim to be an expert.
Anyways, as I will be running AC and dryers and the such in my house, the system is a fair bit bulkier and I reckoned I could use more sets of eyes on my idea. The PV array consists of 32 24v 300w Renogy panels off Amazon (or somewhere else if I can find cheaper) with VOC 38.92. So my system will be 9,600w which should give us a little over what we truly need but allow me to run power tools and such in my workshop without worry. These will be wired as eight sets of four panels in series. So each set would be at max about 156v, and 12.5a. These will then go down to some DC disconnect switches rated for 16a because I can’t find any rated at 13a on Amazon. From there I’m ganna run the wires down still as eight sets of four into 16a breakers. They are 16a for the same reason as the dc disconnect switches.
After that, I’ll either solder or crimp all the negatives together and then all the positives together in parallel with now a max of about 156v and 100a. These two wires will then run into a 250v/100a MPPT. That will probably be a Victron because that’s what I used previously and they seem to be high quality. From here I’ll run the negative and positive through a 3-way fuse box with 100a fuses on each. From here the wires will go to 12 2v 1255ah Trojan carbon deep cycle batteries wires in series. This will give me 24v, and cause me to buy a slightly more expensive inverted because I was ganna originally use Wagan’s 10,000w inverter on Amazon but it is 12v. I didn’t wanna run the batteries as two 12v strings because I have read on the forum that this may cause two of the batteries to wear out quicker because obviously the charge controller goes off the battery “cell’s” overall voltage.
Anyways, I’ll then run another short lead from the battery side of the fuse block from the positive to a 400a fuse in the middle. From here I’ll run a positive lead from this 400a fuse to the inverter, and another negative lead from the fuse box at the same terminal as the 100a fuse to the inverter. The inverter I am thinking is Sigineer 48v 10,000w inverter. I think it either runs or will run as 24v though. Not sure though, if it is 48v will it run fine with the 24v battery cell? Anyways, I calculated that with about 2.3 hours of full sun I should be able to get the batteries from 75% to 100%, and this is right where I want it for where we live.
Also, I’ll be running grounds from the PV disconnects, breakers, MPPT, and inverter. I can’t remember the precise angle I need on panels but I think it was about 36 degrees for us. I’ll face the panels North, and they’ll be fixed because I don’t wanna do maintenance on a rotating array. The whole system will be on the ground, and the batteries/charge controller/inverter/etc will be stored in a shed right behind the panels. The shed will be well insulated. I was ganna set the batteries just on the concrete slab... I assume that is fine?
Let me know your thoughts, and I appreciate you guys having a look! I’m just planning everything now, nothing is bought so plans are very flexible.
I’ll be putting it all together myself so the cost is just materials, which should run me about $20k all up.
Take care,
Superdoom
I’ve been drawing up a circuit in my iPhone notes for the solar circuit I want to put in the house I am going to build. I have only put together an off-grid solar system once before for my parents’ house, but it was much smaller. My parents’ house has a 3000w array with a 100v/50a MPPT, a 3000w inverter, and 8 6v 232ah deep-cycle lead acid batteries. As to the brands and other details I cannot remember because I put the system in years ago. I’m not an electrician or anything, I have worked in construction and now work in another field. Basically, I am just saying that I don’t proclaim to be an expert.
Anyways, as I will be running AC and dryers and the such in my house, the system is a fair bit bulkier and I reckoned I could use more sets of eyes on my idea. The PV array consists of 32 24v 300w Renogy panels off Amazon (or somewhere else if I can find cheaper) with VOC 38.92. So my system will be 9,600w which should give us a little over what we truly need but allow me to run power tools and such in my workshop without worry. These will be wired as eight sets of four panels in series. So each set would be at max about 156v, and 12.5a. These will then go down to some DC disconnect switches rated for 16a because I can’t find any rated at 13a on Amazon. From there I’m ganna run the wires down still as eight sets of four into 16a breakers. They are 16a for the same reason as the dc disconnect switches.
After that, I’ll either solder or crimp all the negatives together and then all the positives together in parallel with now a max of about 156v and 100a. These two wires will then run into a 250v/100a MPPT. That will probably be a Victron because that’s what I used previously and they seem to be high quality. From here I’ll run the negative and positive through a 3-way fuse box with 100a fuses on each. From here the wires will go to 12 2v 1255ah Trojan carbon deep cycle batteries wires in series. This will give me 24v, and cause me to buy a slightly more expensive inverted because I was ganna originally use Wagan’s 10,000w inverter on Amazon but it is 12v. I didn’t wanna run the batteries as two 12v strings because I have read on the forum that this may cause two of the batteries to wear out quicker because obviously the charge controller goes off the battery “cell’s” overall voltage.
Anyways, I’ll then run another short lead from the battery side of the fuse block from the positive to a 400a fuse in the middle. From here I’ll run a positive lead from this 400a fuse to the inverter, and another negative lead from the fuse box at the same terminal as the 100a fuse to the inverter. The inverter I am thinking is Sigineer 48v 10,000w inverter. I think it either runs or will run as 24v though. Not sure though, if it is 48v will it run fine with the 24v battery cell? Anyways, I calculated that with about 2.3 hours of full sun I should be able to get the batteries from 75% to 100%, and this is right where I want it for where we live.
Also, I’ll be running grounds from the PV disconnects, breakers, MPPT, and inverter. I can’t remember the precise angle I need on panels but I think it was about 36 degrees for us. I’ll face the panels North, and they’ll be fixed because I don’t wanna do maintenance on a rotating array. The whole system will be on the ground, and the batteries/charge controller/inverter/etc will be stored in a shed right behind the panels. The shed will be well insulated. I was ganna set the batteries just on the concrete slab... I assume that is fine?
Let me know your thoughts, and I appreciate you guys having a look! I’m just planning everything now, nothing is bought so plans are very flexible.
I’ll be putting it all together myself so the cost is just materials, which should run me about $20k all up.
Take care,
Superdoom
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