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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: https://www.currentconnected.com/?ref=pwd
Downloadable Parts Lists with Cost and Circuit Diagram – Link: https://drive.google.com/file/d/1dMR7HIPvhcqb2EtShifwQy49ZrQrgJT6/view?usp=sharing

System Components:
SOK Battery 100Ah 48v Server Rack Battery: https://www.currentconnected.com/product/sk48v100/?ref=pwd
Victron 48v Multiplus-II Inverter Charger 3000va 120V: https://www.currentconnected.com/product/pmp482305100/?ref=pwd
MegaFuse Holder + 2 Fuses (58V 125A): https://www.currentconnected.com/product/megabundle/?ref=pwd
1/0 AWG Red + Black Pure Copper Battery/Inverter Cables (1.5 Ft Battery Parallel Connection): https://www.currentconnected.com/product/bc-i-0awg/?ref=pwd
1/0 AWG Red + Black Pure Copper Battery/Inverter Cables (4 Ft Inverter Connection): https://www.currentconnected.com/product/bc-i-0awg/?ref=pwd
1/0 Battery Cable Lugs 5/16″: https://www.currentconnected.com/product/bclug/?ref=pwd

Fully Loaded 25kWh SOK 48v Server Rack Battery Kit – Bundle & Save: https://www.currentconnected.com/product/fully-loaded-25kwh-48v-server-rack-battery-kit-bundle-save/?ref=pwd

Optional Materials & Sources:
UV Resistant Black Zip Ties: https://amzn.to/3hwENeS
1/0 AWG 10 Feet Red + Black Welding Battery Cable kit; https://amzn.to/3Qtvmx4
Ground Wire Solid Bare Copper 6 AWG 20 FEET: https://amzn.to/3QBtMIS
125A CNN fuse: https://amzn.to/3SYhpIJ
CNN/ANL fuse holder: https://amzn.to/3yKdves
Q150 50-Amp Single Pole Type QP Circuit Breaker: https://amzn.to/3Tr7DyI
Q120 20-Amp Single Pole Type QP Circuit Breaker: https://amzn.to/3CzFvTb
Siemens QA120AFCP 20-Amp Single Pole 120-volt Plug-On Combination AFCI Breaker: https://amzn.to/3EJei32

Tools:
AC Watt Meter: https://amzn.to/3CYn5gj
TEMCo Lug Crimper Tool; https://amzn.to/3AqJ0eK
Klein Tools 11063W Wire Cutter/Stripper; https://amzn.to/3pjebm1
Cable Stripping Knife; https://amzn.to/3SSJIZk
KAIWEETS HT206D Digital Clamp Meter; https://amzn.to/3zY2LJc
KAIWEETS HT208D Inrush Clamp Meter; https://amzn.to/3A549cV
KAIWEETS Digital Multimeter (8% OFF CODE: 08O3ET7H); https://amzn.to/3PBb0Aw
Solar Crimping Tool: https://amzn.to/2XzXHIe
Solar Panel MC4 Connector Assembly Tool: https://amzn.to/39rYLDt
Fluke IRR1 Solar Irradiance Meter: https://amzn.to/3xe8av6

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Timestamps:
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

Disclaimers:
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.

Affiliate information and disclaimers:
Links in description may be affiliate links, we may get paid if you purchase something through one of these links. This helps out our channel at no extra cost to you. Thank You!
(As a SanTan Solar Affiliate I earn from qualifying purchases)
(As an Amazon Associate I earn from qualifying purchases.)
Projects with Everyday Dave is a participant in the Amazon Services LLC Associates Program,
An affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com

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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: https://drive.google.com/file/d/1dMR7HIPvhcqb2EtShifwQy49ZrQrgJT6/view?usp=sharing

    Current Connected Website Affiliate Link: https://www.currentconnected.com/?ref=pwd
    Check out my DIY 12V off grid system here: https://youtu.be/OwfGLu8IY_M
    Check out my latest solar install on my shed here: https://youtu.be/Y8OGxdJ9cU8
    Check out my original ground array install here: https://youtu.be/_xA6qOwnYbM
    Great breakdown on bifacial solar panels here: https://youtu.be/1SXNjsSsmq0

  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?
    Thanks
    Tony

  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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