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Home » Battery BACKUP for Home – DIY Step by Step

Battery BACKUP for Home – DIY Step by Step

DIY home battery backup using Victron Multiplus-II and SOK 48V Server Rack batteries.
Current Connected Website Affiliate Link:
Downloadable Parts Lists with Cost and Circuit Diagram – Link:

System Components:
SOK Battery 100Ah 48v Server Rack Battery:
Victron 48v Multiplus-II Inverter Charger 3000va 120V:
MegaFuse Holder + 2 Fuses (58V 125A):
1/0 AWG Red + Black Pure Copper Battery/Inverter Cables (1.5 Ft Battery Parallel Connection):
1/0 AWG Red + Black Pure Copper Battery/Inverter Cables (4 Ft Inverter Connection):
1/0 Battery Cable Lugs 5/16″:

Fully Loaded 25kWh SOK 48v Server Rack Battery Kit – Bundle & Save:

Optional Materials & Sources:
UV Resistant Black Zip Ties:
1/0 AWG 10 Feet Red + Black Welding Battery Cable kit;
Ground Wire Solid Bare Copper 6 AWG 20 FEET:
125A CNN fuse:
CNN/ANL fuse holder:
Q150 50-Amp Single Pole Type QP Circuit Breaker:
Q120 20-Amp Single Pole Type QP Circuit Breaker:
Siemens QA120AFCP 20-Amp Single Pole 120-volt Plug-On Combination AFCI Breaker:

AC Watt Meter:
TEMCo Lug Crimper Tool;
Klein Tools 11063W Wire Cutter/Stripper;
Cable Stripping Knife;
KAIWEETS HT206D Digital Clamp Meter;
KAIWEETS HT208D Inrush Clamp Meter;
KAIWEETS Digital Multimeter (8% OFF CODE: 08O3ET7H);
Solar Crimping Tool:
Solar Panel MC4 Connector Assembly Tool:
Fluke IRR1 Solar Irradiance Meter:

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00:00 Intro
00:45 Materials
04:59 Overview & Mounting
08:34 Sub Panel Wiring
09:58 Inverter AC Wiring
14:50 Battery Install
15:33 DC Wiring
22:11 48V SOK Battery Startup Procedure
25:22 Fridge Test
28:08 UPS Test
28:58 Miter Saw Test
29:54 Planer Test

This video is for information purposes only, and does not constitute professional advice. Solar systems can and do involve dangerous electrical connections. If you do not have experience with electrical wiring, please seek professional support.

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(As a SanTan Solar Affiliate I earn from qualifying purchases)
(As an Amazon Associate I earn from qualifying purchases.)
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26 thoughts on “Battery BACKUP for Home – DIY Step by Step”

  1. Downloadable Parts Lists with Cost and Circuit Diagram – Link:

    Current Connected Website Affiliate Link:
    Check out my DIY 12V off grid system here:
    Check out my latest solar install on my shed here:
    Check out my original ground array install here:
    Great breakdown on bifacial solar panels here:

  2. I designed and built a similar system of six GC-2 batteries charged by a 1 kW photovoltaic array and a 6 kW split-phase inverter. I was able to make substantial savings by winding my own transformers for the low-frequency inverter. The lead-acid cells were also chosen as a low-cost stopgap, the battery bus sags below inverter cutout voltage if the current exceeds 0.6C, so they're to be upgraded when the lead is dead.

  3. Great video thank you Dave I have learned so much from you. I do have a question can I hook the battery system up to my system since I feed it back to the power grid. Sorry if I am not using the correct thermology still learning.

  4. Great Video Dave…. You didn't say, But did you open and close the fridge as normal? or treat it like "emergency" I know during Storm outages, I currently dont run the genset full time, but we really try not to open fridge unless needed

  5. Great video. One thing I did not understand: If the grid goes down (and not you switching the breakers) then your AC-side of the inverter is still physically connected to the grid, isn't it? I did not see an automatic transfer switch in your setup. Or is that built into the Victron inverter?

  6. Voltage droop doesn't happen until the wire is tasked to carry more current than it is supposed to carry. Watch your meters while the load goes up. I saw 104volts when you made one pass that connected with the log well. Michael in Colorado.

  7. Great video Dave! I'm starting from scratch and this is pretty close to what I'm looking for. Primarily looking for standby backup power for critical circuits. I have considered solar but we simply have too many large trees to make it cost effective.
    Is it possible to have the UPS setup but be able to supplement battery charging with a gas generator when there are longer outages?
    I'm not clear that using a transfer switch on the multiplus a/c input would give the desired result? Or would it? Would the excess generator power charge the batteries?
    Are there other Victron models (or other brands) with better a/c input connections, not the push-in?
    Maybe the Victron Quattro Inverter is what I'd want?

  8. I want to do this for backup at my home. Is there anything here that an inspector would have an issue with? I know that there can be location specific requirements but is this all NEC compliant or can things be done to make it so? At think point my setup would be only for backup with no intention of sending excess power to the grid.

  9. Just wondering how your equipment bond is connected in your transfer switch that goes from the panel above it? Are you using the bonding screw inside the transfer switch?

  10. I stopped here for I had 30 minutes to "waste". Left with much gratitude for a smooth teaching style and a solid presentation. Thanks for the demo on the Temco crimper. I used your link and one is now on the way to my shop.

  11. Another way to take care of the inrush of the inverter when it is first setup is to use a variable DC power supply to bring the Voltage up on the input with the batteries turned off. Serves the same as the precharge resistor in that it allows a control over the current the capacitors draw. That is how I do it on my 6K inverters.

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