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OK ... So I waited until this issue was fully resolved to give me thoughts. And now it is ... Most People do not share their success stories, so I wanted to give a thumbs up to Signature Solar for this resolution We purchased a Growatt 12kW SPF 12000T DVM MPV 250voc from Signature Solar...

Up until Last week I had never heard of pre-charging a larger inverter before connecting the battery cables. I just lived with the spark. But I was watching a "Will" video about a DIY LFP build and saw that he used a resistor before connecting the Positive Terminal. This peaked my...

Installing The Big Growatt SPF 12000T 12kw Inverter into a Cargo Trailer for a 12k watt mobile power generator. All the panels will be installed on a pole/post barn and I will connect the Inverter's Solar Charge Controller MPPT to the panels via 8 awg SOOW cable and Anderson Connectors. First...

Today was cleaning, feeding and care day in the hydro garden . Got everything dressed up for beauty shots. This little hydro system keeps the wife and I in salad and greens 3-6 days a week. All we want. I harvested 3 stuffed grocery bags off it Monday ... Cut all these lettuces to nubs, and...

THREAD INDEX: (Links Updated: 2/15/2024) This is a long Thread, So I have added this Index Note: Click the Post Number to Follow the link. The Topic discussion will follow from that Post TOOLS USED FOR DIY A/C INSTALLS Tools - 662 THE INSTALL General 1st 24k - 5 2nd 24k - 6 12k - 139 Nitrogen...

Been working on it and planning it for a while. And it just so happened to work out that the day I actually finished the job was also my Birthday ... today ? I have a single Midnite Solar Classic 150. For the past four years it has been just fine with a MS Classic Sizing Tool sized array...

I had a few little extra pieces of shrink wrap so I decided to wrap the tools that I commonly use around the Lifepo4 cells and terminals. Large heat shrink on the sockets A piece of heat shrink on the metal section of the torque driver And a composite ratchet round out my safety pieces I used...

This is a simple Unboxing and First Impressions of "EVE" 230Ah batteries I received from Doncan Technology (Shenzhen) Co seller @Amy Zheng. Purchased from their TX warehouse shipped to FL. I do not pretend to be as informed and knowledgeable about LFP batteries and their purchase as many people...

1000 Posts !! Who Cares Right? I must ask too many Questions, because I surely do not have that many answers. Thanks for all of you who have put up with me this long and thanks for tolerating my Posts Filled with obvious questions and occasional thread hijacking (hey it happens to all of...

I built my lil off grid system to assist my grid powered house 4 years ago. At the time People asked me was I was "Crazy", "You Need a Sanity Check", "Why would you build an off grid system for your house if you are grid connected AND your cost per kWh was about $0.11" . I was told I would...

Just got an email saying Docan has the Seplos Mason boxes selling them with or without cells. I was guessing they were not assembling the ones with cells, but it was interesting too me as I am about to start another project and might be building up a Dual XW Pro system with about 30 kWh+ of...

Planning to buy a Growatt SPF 48vdc 12kw 250. Already talked to Watts247 asked about over paneling. Said you can over panel the spf 12kw inverter / SCC. Real Estate does not matter. The array is going in a 10 acre pasture field The Growatt Manual says 7000w array and a max of 250vdc...

I had been asking in a different thread I did not start so decided to start my own thread I have narrowed my new LifePo4 bank size down to either an 8s 272 ah bank OR an 8s2p 564ah bank (8s 272 paralleled). I need 200 amp discharge and so picking a reliable yet affordable permanent install...

I searched and could not find much info about comparing these 2 devices. Are they TOTALLY different? My understanding is the MN SPD is probably not fast enough an EMP , but would the EMP Shield work as an EMP protection device (as it claims) AND a surge protector like the MN SPD?

So I'm Sitting here today laying out the cable design from my battery banks to the Inverter. Putting it all on paper helps me visualized how I will set it all up, and how many lugs I will need, what sizes, and what size cables, etc. But Boy! ... This seems like a boat load of connections...

I know when top balancing multiple cells in parallel the rule of thumb is to - 1st set the bench top power supply to 3.65v - Then connect the power supply to the battery posts , preferably with hi quality leads But when I do this and the paralleled group of cells is at a low state of charge...

I'm using 6 Awg SOOW cable for my AC electrical connections in my mobile cargo trailer build. Was going to use MC, but I thought the SOOW looked clearer. Problem I'm having is connecting the fine stranded 6 awg wire to busbars and screw terminals. When the screw bites, some of the the wires...

I was thinking about some of the larger (like a Growatt 12kw) AIO inverters/SCCs. The low frequency ones I've looked at seem to have pretty high idle consumption. (75-150 watts just being on, not in power saver mode ~ depending on who you ask) So if lower idle consumption is your thing, I was...

I would like to run a Mini Split in my bed room as a supplement to my 3 ton and 1 ton systems, but run the mini split off grid. Space too cool for the mini split = 285 sq ft. So 9000 btu would be about right. Needs to be Cool and Heat so looking at Heat Pumps. I have been running a gird...

I'm tinkering with the production of my 2 arrays - System is 24v with 2 arrays and 2 Classic 150s - Array 1: 9 REC 285w panels / 2565w total 3s3P / VOC 38.4 or 115.2v array input voltage to SCC #1 - Array 2: 9 REC 290w panels / 2610w total 3s3p / VOC 38.6 or 115.8v array input voltage to SCC #2...

Ok, so back here I built a precharge resistor setup with push button start for my Schneider SW inverter. I used a 100w 50 ohm resistor. But it seems improperly sized as the inverter goes into a surge and blinks on and off if I hold the button more than a second or 2. The SW is trying to start...

I'm adding another string to each array. Which means I will out grow my 2 Midnite Solar 3 sting combiners. I'm upgrading to a Watts247 8/2 combiner Problem is, all PV wires (strings) go into conduit and into the attic and into the MS combiners. But with the the addition, the existing PV wires...

I'm building out an array that needs to be +/- 7000w's. It will be off the ground about 5 or more feet in a field, so I might bennifit from a bifacial design. Here's the Dumb Question. When considering a 300w bifacial panel, is the watt rating for the front side only, or the presumed...

I have to stay in a Single Series String to keep the Array amperage in spec for the project. But .... If I install the array with all 6 panels facing the south direction, the lowest 2 panels will be in the shade part of the day. Panels REC TwinPeak 2 Rated Power: 375W Open circuit voltage...

OK so I just this weekend installed a Watts247 8 in / 2 out combiner Specs - 15 amp fuse on each of the 8 input string - 63 amp quad breaker on each of the 2 output groups Doing Some Temp Testing of this box now that it is installed Here is how the panels are connected The panels connected...

I need to make 110 ft runs from my panels thru my roof opening and to the combiner. Is there any problem with placing an MC4 connector just before the roof entry / junction box, or should I go for a continuous run of 10 awg solar cable? There will already be 1 MC4 connection at the panel so...

Capacity testing ... I'm Going to run the test again with a different setup

I have read everything I can find about roof top panel grounding. I have watched the Mike Holt video several times. I have read conflicting interpretations of the video and of roof top panel grounding in general on different forums. Owners manuals from Schneider and Midnite solar are also...

I have 2 48v 280ah DIY batteries. System has been up and running for several months no problem. The entire system (except Solar panels) is mounted in a cargo trailer and today, out at the farm, them moved the trailer. After powering everything down, moving the trailer, then powering...

I have seen where other people have had some trouble updating the firmware of the various Growatt units. What are the Pros and Cons of updating the Firmware? (other than the obvious “when you update you have the latest greatest”).

In the past year I purchased 2 of the 4/2 combiner boxes from Watts247. System has been up and running about 5 months. - Array is an 8s4p 365 watt panels - Goes into 2 Watts247 Combiners. 4s into 1, 4s into the other - 2p comes out of each, and Each of these 2 go to the Growatt AIO and SCC...

I am building two 8s packs each with its own 24v 100amp OverKill Solar BMS. I want to keep the main +/- cables between the packs and the busbars the same length. But the negative (-) will have the BMS in the middle so the negative cable will need to be split in two AND also will have double...

My present array was designed using the Midnite Solar sizing tool and pretty much maxed out 1 Classic 150 scc. Midnite Solar has assured me there is no problem over paneling the Classic 150 even doubling my present size, the excess power will just be wasted. Overpaneling will help (I believe...

I go to the dentist for a cleaning twice a year. I think I my teeth are clean, but apparently not. I top balanced my EVE 230 x2 and Calb 280ah x 1, 24v LFP banks 18 months ago when new . They seemed to stay pretty tight, but recently have started to drift above 3.45v per cell. How often...

I designed my system 4 years ago and it has been up and running well since. I recently upgraded to a 24v 8s 230Ah LFP x 2 in parallel ~ 8s2p battery bank and I am finding I only have enough power coming in from the array for a full charge IF the conditions are optimal. Getting another Charge...

I'm old, It's Late, it's 1am and I am looking at the monitor with just one eye. Can you please talk a look at this wiring, fuse, breakers, ground etc diagram and give me some pointers? What have I missed? I have not ordered any balance of system yet, just main components. So just now...

Thank you for letting jump in here in this forum, poke around, ask some questions that have already been asked a dozen times (yes I am often guilty of 'Ask 1st - search the forum later' ), yet still being met with patience, and even order some Lifepo4 batteries in the buy group without being...

OK ... so not exactly Math ... but I have 2 Arrays of 9 panels each. Each array has 3 strings and each array of 9 has its own Midnite Classic 150 Charge controller. My System voltage is 24v I want to add 2 more strings of 3 panels each string. 1 additional string of 3 to each charger ... a...

Just got my Rosie Beta Tester email. Problem is I do not need just 1 Rosie at 7kw, I need 2 with the option to go to 3 or even 4 stacked. Any one know if the Rosie will be stackable? I'm Looking thru the documentation now, but not seeing a reference to adding more yet.

I'm about to build up an off grid homestead using a 48v Growatt 12kw and 32 EVE LF280 ah cells. My estimate is for 250 amps DC. Maybe it's overkill, but I was thinking of using 4/0 cable for going the 6-8 ft between the battery and the inverter. But then I thought how tiny those M6 studs...

Just finished building up two 8s 230ah packs (here starting at #28) each with its own 100amp Overkill Solar BMS. The packs are joined in parallel at big busbars. I went to great pains to make sure all connection cables were the same length. Everything is Flowing pretty close charging and...

A few years about I installed an Outback x240 Autotransformer to my Conext SW4024 4000w Split Phase 120vac/240vac Inverter. I did this for balancing loads between L1 and L2 because the SW has a Grid Interactive / Grid AC Support Mode that "Supposedly" draws from the battery for loads over 2amps...

I saw something like this in a recent thread, but I think the OP said it had to do with charging and I did not want to hi jack the thread. Here is the scenario, - JK/Heltec 200 amp BMS with 2 amp Balancer - Growatt 12kw off grid inverter - 16s (x2) EVE 280 cells = 48v - SOC is about 78% -...

I'm finishing up my build of my newest battery. Trying to understand how many Amp hours I got here. If I build a 2p8s battery from 16 304 EVE cells, is that considered 608Ah's? I think that's what it is? Is that correct? And so, if I currently have... A 2p8s battery made of 16 230ah...

We have kicked around over paneling the Growatt 12kw 250vdc and it seems from many discussions, that it is not advisable. Might could get away with maybe 20% over, but in the end we decided it is not worth it, so we decided to just add a second 250v SCC. I had found an 8 string input, 2 output...

Background: While I wait for my LFP bank to arrive (just ordered so I expect 60-90 days) I am wondering about the importance of Capacity Testing and Do I REALLY NEED to purchase more equipment than what I already have. The bank will be an 8s2p, two BMS set up with 272ah cells totaling 544ah...

I have purchased a Growatt SPF 12kW 250v DVM MPV and an extra external SCC, the Growatt SC48120-MPV. Both are rated for 60-245vdc input from the solar array. Today I powered up the whole system (12kW, SCC and a small test Solar Array) for the first time. Everything seemed to work Fine at...

When setting up a BMS like the Overkill Solar (OKS) 24v 100amp BMS, is it best to put a lug on each in and out wire to connect to the battery, ... OR ... is it better to put both wires coming off the BMS into ONE lug that connects to the battery?

I am installing 32 280Ah EVE cells in a 16S2P configuration. I have 2 225 Class T fuses on each battery bank wired to the parallel basbar with 2/0 wire. From the busbar I am running 4/0 to the inverter. I will be installing a Marinco Dual Bank Control Switch with a precharge resistor. The...

Bulk / Absorb set to 55v , but the Growatt SCC would reach that and just keep going up. According to the Victron Smart Shunt there is no current, but voltage got up to 58.9 and the BMS (Heltec 200amp 16s x2 ~ 16s2p) shut both batteries banks down. But I do not understand why the SCC voltage...