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diy solar

diy solar

How many systems do you have?

JJJJ

Aspiring apprentice
Joined
Feb 25, 2021
Messages
1,606
OK. After following this forum for a while I must admit I have been impressed with the builds out there. There are massive systems which run an entire household (or perhaps a small city LOL). Others live off grid with less powerful systems but have done their homework with energy conservation and operate quite nicely on a day to day basis.

I am looking for those who have chosen a decentralized approach. Let me get things started.

My main build is a Victron Multiplus 24v 3K and when complete will have 4 8S batteries at approximately 275 to 300 amps each. It has two dedicated electric circuits off a distribution box for outlets which can be used for lighting or other purposes. I am considering a third circuit to service other areas.

I also have a portable build which is attached to a Victron Multiplus II 3K which has been tested with a variety of items including a chest freezer, stand up air conditioner and a saber saw. It handles each of these quite easily.

Currently I am building two 12 v batteries. One will power some basement lighting with a low power inverter and the second is being considered for a dc driven project.

This evening we had a power outage for about 2 to 3 hours. A simple test of my systems. There were a few good items and a couple of potential considerations for improvement. The basement freezer ran fine attached to the portable build. Before the power came one I was running lighting in the family room and watching tv powered by the main build. My lamp upstairs was powered by an UPS and had another 5 hours before it was slated to be empty. I need to look at the rollers on my fridge as one or both front ones have broken and I cannot currently move it. I would like to roll it away from the wall so I can power it as well.

Ok your turn to share.
 
OK Go big or go home. Just kidding. But seriously and this is the difficult part try to envision what you want at least a year from now. Don't piece meal it. It will definitely cost less if you can scale up your thinking and buy a homogeneous system to do everything you want. I know that is nearly impossible because we all think in a sequential fashion. First the brand is fine but I would recommend you go 48v from the start. You could build similar but 2p 16s. battery from the same number of cells. 48v will be less expensive to scale up when the light bulb goes off in your head. Believe me it will.
 
When complete, I will have 3 (or 4) systems. But they are not completely separated. They can operate separately, if needed. But are normally operating in concert with each other.
The 3 systems currently planned are...
30kw main house system
30kw critical loads system
10kw garage system
A 4th system will be for a future shop, if I build one.
All systems can power any and all loads, together or separately.
 
I have VVVVVVVV(see signature) three systems, currently up-grading the main Shop-House system to 24kW output, will reuse two of the 6kW inverters in two new locations, one remote, and one tied into the main system (following along Tims set up so I can clone it!)
So that makes 3 current systems, 2 in progress, total of 5.
 
They can operate separately, if needed. But are normally operating in concert with each other.
Yours was one of the systems I was thinking about when when I mentioned the builds I admired. Very nice work by the way.

I like the concept of redundancy. In my case the 12v batteries will be taken from my original build and moved to less critical usage since they are not as robust as the others. I am preserving my investment. As a result I may only have one or two cells which will be relegated to the "do not use" category.

I strongly considered 48 v and came very close to this direction just before building my portable unit. Due to space, etc, I elected to remain with 24v and have been happy with this decision. I will have a limited number of panels running for now so this meets my needs very nicely. Currently I have been down this road for 3 years and have learned a ton, thanks to this forum.
 
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I also have 3 systems running.
Oldest system is professional install, grid-tied without storage from 2004 and got switched to NEM-3 three days ago. Guess what's on my mind all day long.
It operates auxiliary buildings, well pump, booster pump, road lights.

2nd system is a DIY 24V off-grid system with 15kWh storage. I use it to power my man cave and charge a PHEV.

3rd system is a DIY 48V off-grid system which powers my house that I sleep/ eat etc in.

Presently I am debating whether to add storage to system 1 as my bill will change big time in 4 weeks and going forward.

Or join circuits from system 1 to system 3 and just add 48V batteries there.

I see having multiple independent systems as a plus. Redundancy = safety.
 
1. 8 kW grid tie Solar Edge
2. 1 kW FLA 48 V, now retired and repurposed
3. 20 kW SolArk 15k with 60 kWh storage feeding house
4. In progress 4x EG4 6500ex making 3 phase for barn. Working on another ~6 kW of panels but will share batteries with SolArk
 
1. Main system running some critical loads:
3kw 24v AIO w/1200w solar

2. Portable solar generator:
1.5kw 12v inverter, 20a SCC

3. (WIP) Home office UPS:
1000w 12v AIO w/400w solar
 
Oh man, where to start 🤣

Main house, 40kWh EP cube with 16.32kW array

Workshop, 90kWh battery, 9.6 kW array

Bombshelter. Classified. Working on that video still ;)

Each of my golf carts has a system, gate opener, trailer, multiple solar generator carts etc. they run everything.

10 heat pumps for 4 buildings.

Its never enough...

Anything I don't keep for big systems gets donated to forum members
 
Main system for the house, have parts and noodling about with a couple of remote WiFi and camera systems to keep track of boats and have WiFi at the beach. #NeverADullMoment.
 
A - 20 W panel + SLA 12 V battery for light in shed (quite enough for finding a way out),
B - 50 W panel + SLA 12 V battery for porch/outdoor stair light + backup power for alarm,
C - in the works - 950 W panels + 24 V LFP for small loads / emergency lights / phone chargers etc. It will also power the essential part of IT stuff if the sun will allow.

The idea is to use C as charger for B in case there are not enough sun for B to recharge.
Hope to get this running by spring of 2025, then ... let's see what's next.

Also I'm maintaining 4 small surveillance systems in remote locations, one will arrive soon to be rebuilt.
#NeverADullMoment
 
1. 400w array/12v 120A battery in Gatehouse for lighting, alarm system and battery charging of landscape equipment UTV etc.
2.1500w array/24v 400A battery in Equipment building for lighting, alarm system, battery charging for maintenance equipment. (installation in progress)
3. 5000w array/48v for 1000sqft cottage in design stage.
All off grid systems.
 
1) MultiPlus 3000, 20 kWh battery, 3600 w solar. House backup system.
2) Phoenix 1200, 2.5 kWh battery, 800 w solar. Shed system.
 
1. 2100 watt 24 volt system powering main house battery.

2. 2200 watt 24 volt system dedicated to air conditioning system.

3. 280 watt 12 volt system to run my DC freezer and water pump in garage.

4. 280 watt 12 volt system to run Chiller that cools my main LFP battery in the summer.

5. 130 watt 12 volt system to run water pump and VHF radio in main house.

6. 65 watt 12 volt panel, hard wired into fans pulling hot air out of garage.
 
Myself and my neighbor (2 unit condo) have 3 Sol-Ark 15K systems (6.8KW, 8.1KW, 8KW). One for each condo unit and one for the common garage. I've added 20KWH of battery to my system. The end goal is to have batteries on all 3 systems and use the 17KW Generac generator to charge batteries as needed. Unfortunately my neighbors business was hit with a big setback and he's reluctant to invest in batteries. However, he got good news this week; maybe we'll be back on track next year.

My goal is withstanding long term power outages. I've been through 2 ice storms in New England.
 
Main house: 57kWh battery, 7.4kW array (planning to add 6.7kW to array)
Outbuildings: 24kWh battery, 3.7kW array

Outbuildings system also serves as backup to main house system, 2 Delta Pros (120/240) serve as backup to outbuildings system (and also deployed for various other temp uses as needed)

100% off grid
 
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2 48 volt systems (13Kw & 2Kw)
4 24 volt systems (2 4.8Kw & 7.2Kw & 2Kw)
4 12 volt systems. ( 3 1Kw & 1.5Kw)
54 250 watt panels
26 100 watt panels
50 KWh Lifepo
15 KWh agm
Mainly victron and mpp equipment
All off grid systems so part of these are spare units nearest power pole is 10 miles away
 
What is the naming convention? Does 13Kw (kW?) mean 13kW max power output or theoretical 13kW pv output?
The wonderful thing about standards is that there are so many to choose from. 🤔

Is my 3kw inverter with 2400w of panels and 8.6kwh battery a ... ???? system?

Can I do like inverter companies and just use the highest number I can come up with and say it's a 8.8kw system?
 

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