All-In-One Solar Power System
-Build a full size system in minutes-

MPP and a few other manufacturers now sell a "complete off grid system in a box" that has:

• AC Inverter
• Solar Charge Controller
• AC Battery Charger
• Automatic Transfer Switch (if grid power is available)
• Circuit Breakers/ Temperature Protection/ Custom Charge Profiles

And they work! Instead of cutting/stripping/crimping wires for hours, and calculating fuse and wire gauge sizes, you can choose a package below and assemble it in minutes!

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That is awesome! What is the catch?

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Pros:

• Cheaper than buying the individual parts and putting them together yourself
  
  
• Takes an hour to assemble
  
  
• Easy to program and can work with ANY battery (Lead Acid/LiFePO4/Titanate etc)
  
  
• These units are made for offgrid use, but they have an AC input which can be used with the grid. This is because it has an AC battery charger built in. Or you can change the settings and use it as a UPS when the battery is low. It will divert grid power to your loads automatically!
  
  
• High efficiency. Most I have measured are 93% efficient, which matches the efficiency figure in their datasheet. That is very impressive considering their price!
  
  
• No need to calculate the requirements of your system, or safety devices. Connect some batteries and solar panels, change the settings, and you are done.
  
  
• The DIY battery community has used these units 24/7 for years! They are extremely dependable. 
  
  
• As of 2021, they are now UL certified! This means that the components inside the units are high quality. This is not easy to do, and it creates confidence that these units should last a long time!

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Cons:

• ​High idle consumption. If you wish to have your inverter on 24/7, you may want to invest in a victron or xantrex (but they will cost 3x-5x as much money). Because the idle consumption is high on these all-in-ones, you will need at least 400 watts of solar panels attached to your system to offset the loss. If you do not plan to have your inverter on 24/7, this is not a problem. 
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• Some models have a lower solar panel array input voltage (usually 60-148VDC). If you plan to connect a large solar array, you will probably need to put your panels in parallel to keep the voltage down. When you have more than 2 strings of panels in parallel, you need over current protection for each string. This is easily accomplished by using a combiner box. They are available below. Some models, like the MPP LVX, can handle 450VDC! So this issue is only for the smaller units.
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• Not an actual downside, but a common mistake among beginners: There are many "all-in-one" systems that are available in america, but are designed for europe's grid, and seem cheaper (higher output for the cost). But you should not buy them!! 
  
  People see the cheaper price and think, if I can add a $300 transformer to the european model, I can have more output and save $150. The problem is that european grid designates ground as the neutral conductor. And in america, we use center tap transformer supply to designate ground/neutral. This can cause some serious issues when you connect a european model to americas grid at the input! You can cause a shock hazard on the case of the inverter, or cause a dead short and overload the inverter in a bypass situation.
  
  So to make things very simple: Inverters designed to work in north America, only work in north America. European inverters only work in Europe. That is all you need to know.

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3 System Voltages to choose from:
Everything below is designed to work in North America, not Europe or elsewhere
(International Inverters are available through the distributors below)

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Van life 12v System
​(small and beginner friendly!)

Parts List:

1. MPP 12V 1kW Model:
   Click Here to purchase
   ​​​​
2. ​100-400+ amp hours of 12v Batteries:
   12v Lithium Batteries (choose one with low temp cut off!) Click Here
   
   12v Lead Acid batteries Click Here
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3. 200-500 watts of Solar Panels
   Click Here
4. 6 gauge wire kit (Battery to MPP)
   Click Here
5. Solar Panel Array to MPP Wires
   Click Here
6. ​12 gauge AC Extension Cable for AC Input/Output (needs to be cut and stripped to install into mpp solar box)
   Click Here

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Large Van/RV
​or small ​Cabin
24v System

Parts List:

1. MPP 24V 2.7kW Model:
   Click Here to purchase
   ​​​​
2. ​This system requires 24V batteries:
   24v SOK Lithium Battery Click Here
   
   24V Server Rack LiFePO4 Batteries Click Here
   
   
3. ​200-500 watts of Solar Panels
   Click Here
4. Solar Panel Array to MPP MC4 Extension Wires
   Click Here
5. ​12 gauge AC Extension Cable for AC Input/Output (needs to be cut and stripped to install into mpp solar box)
   Click Here

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Offgrid home/RV/
​Cabin 48v System
(​Power anything you want)

48V All-in-one Buyers Guide Can be found by Clicking Here

Parts list:

Choose an All-in-one:

• ​MPP 6.5kW, 8kW solar LV Model (UL Compliant!) This is my favorite all in one unit. Requires more than 1 for split phase output:
  ​Click Here to Purchase
  
  Click Here to Purchase from second supplier (out of stock often)
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• MPP 6kW 240V split phase output (does 120 or 240V in one unit!):
  ​​Click here to purchase​
  ​​
• Or check out the 48V Buyer's Guide by clicking here!

Batteries and Solar Panels etc:
​Server Rack 48V Batteries:

1. Budget 48V LiFePO4 Battery Click Here
2. Pro Version 48V LiFePO4 Battery Click Here
3. ​SOK 48V LiFePO4 Battery Click Here

 

• T Class Fuse (Required for large 48V systems. For sizing, consult the manual of your inverter):
  300A Click Here
  ​
• 1000+ watts of Solar Panels
  Click Here
  
  
• 2/0 gauge wire kit (Battery to MPP. Check your all in one box manual to see what it recommends. this wire works well for most of them)
  Click Here
  
  
• Solar Panel Array to MPP Wires
  Click Here​

Direct Download Manuals

MPP Manuals:

800w 12v manual PDF
File Size:	4076 kb
File Type:	pdf

Download File

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lv6548_split_phase_manual-20201020.pdf
File Size:	7870 kb
File Type:	pdf

Download File

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Growatt Manuals:

growatt_spf_3000tl_lvm_series_user_manual.pdf
File Size:	16897 kb
File Type:	pdf

Download File

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12v System Schematic

48V All in One Schematic: Dead Simple!

My loads were pretty small for this system, so 10 gauge wire worked great. If you need a thicker gauge wire, use it! Same with the battery supply cables. Read the manual of the LV6548, and see what it recommends for the input and output terminals. Besides that, just stack the batteries up and connect them in parallel, and you are set!

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If your solar panel array has more than 2 parallel strings,
​you need a combiner box

This combiner box has everything you need, circuit breakers, invidual fuses for each string, and a surge protection device. 

Just hook your panels up to this box, and connect this box's output to your All-in-one solar input. 

Click Here for Watts247 Combiner Box


Here is a video on how to use it:

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All-in-one Solar Power Box Recommended Settings:

These MPP units have a lot of settings! You can go through each setting in the manual and set it yourself, or you can follow the settings that worked well for me below. Your needs may vary, but the settings below are good for most off-grid systems. If you have grid power connected, the settings will work great!

In my opinion, the most important setting is the "low DC cut-off voltage". This is setting number 29. You want this to be higher than your batteries low voltage disconnect voltage. 

Most lifepo4 bms cut off at 10.5-11 volts in a 12v System. So I will set the cut off on the inverter at 12v. This way, your bms will never disconnect power from your inverter. If you are runnig lead acid, 12v works well. Double this number for 24v systems.

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Step by Step installation instruction videos