Small Backup System: 1.2KWh

With 400W of Solar and a 1.2KWh battery this setup with the right sun exposure can run a full sized refrigerator indefinitely. Wouldn’t hurt to do 2 panels instead of 1 to account for clouds but if you need something to keep the food fresh the next time the power goes out this could be your ticket.


Advantages

  • Large enough battery to run some appliances indefinitely
  • Lithium (LiFePo4) battery that should last 3000 cycles or more
  • Will handle up to 720W of solar panels

Disadvantages

  • Inverter is 1000 watts, could be undersized for running additional appliances.
  • At 12 Volts if you are planning on a larger system in the future it will be harder to manage the wiring as it gets thicker to handle more load. 48 Volts is a sweet spot if you intend to run a cabin off solar as it brings the wire size down to a reasonable gauge.


Some of the pricing here is from other sites out of our control, with a single 395W Solar Panel expect this setup to cost about $1020. We are assuming the solar panel would be mobile and have not included any mounting hardware. Check out the RV build for some Z brackets that are heavy duty enough to handle these full size panels for installing on a roof such as your shed.

Beene Brothers strives to keep this in stock for $100 as a convenience. If we don’t have it available, Amazon and Aliexpress should be able to set up you with a unit.

This battery is put together by us here at Beene Brothers Solar. It is made up of brand new LiFePo4 Prismatic Lithium cells assembled with finger-screw battery terminals to make this portable battery easy to operate.

  • Continuous Load Output: 80 Amps
  • Recommended Charge Rate: 50Amps
  • Maximum Capacity: 1.28KWh
  • Life Expectancy: Greater than 2000 Cycles
  • Weight 26.4 Pounds
  • Cost: $450

395 Watt panels from Beene Brothers

 

$145 Each

Count Item Cost
1 3 Feet of Red Double 10 Gauge wire for Charge Controller to Battery $4.50
1 3 Feet of Black Double 10 Gauge wire for Charge Controller to Battery $4.50
2 30 Feet of black PV Rated UV Resistant 10 Gauge Wire for Charge Controller to Solar Panels $30.00
1 15 Amp MC4 Fuse for Solar Panels $20.00
2 30 Amp Fuse Holder for Battery Positive Cable $6.00
1 Pair of MC4 Connectors $3.00
1 Crimping and Heat-Shrinking Wires $30.00
Total Misc. $98.00

Small Off-Grid

400 Watt Off-Grid Solar Setup

I see this as a starter system that can charge phones, laptops, run your television, etc. while leaving room to add a Lithium 12 volt battery and some extra solar panels to increase the capacity later on. The main disadvantage.

With one of my panels you’d have 400 Watts of power coming in while the sun is up high. In an optimal position this would be about 2.4kw for the day. Enough that you could run a small air conditioner while the sun is shining, especially if your standard 100AH lead acid battery can only hold 1.2Kw of that energy.


 Advantages

  • No batteries to balance when only 1 is in place
  • No BMS or complicated Lithium Ion to worry about
  • More of a known quantity
  • Could use a battery that is already in place in your setup
  • Inexpensive
  • Expandable later

Disadvantages

  • Inverter is 12 volt, so you can’t move to 24 or 48 volts without buying a new one
  • If you expand the system very far you’ll be dealing with lots of amps, therefore large wire sizes
  • Lead Acid batteries aren’t known for their longevity, expect 300-500 cycles from a new battery


Beene Brothers strives to keep this in stock for $100 as a convenience. If we don’t have it available, Amazon and Aliexpress should be able to set up you with a unit.


Small-Tier Off-Grid

400 Watt Off-Grid Solar Setup

I see this as a starter system that can charge phones, laptops, run your television, etc. while leaving room to add a Lithium 12 volt battery and some extra solar panels to increase the capacity later on. The main disadvantage.

With one of my panels you’d have 400 Watts of power coming in while the sun is up high. In an optimal position this would be about 2.4kw for the day. Enough that you could run a small air conditioner while the sun is shining, especially if your standard 100AH lead acid battery can only hold 1.2Kw of that energy.


 Advantages

  • No batteries to balance when only 1 is in place
  • No BMS or complicated Lithium Ion to worry about
  • More of a known quantity
  • Could use a battery that is already in place in your setup
  • Inexpensive
  • Expandable later

Disadvantages

  • Inverter is 12 volt, so you can’t move to 24 or 48 volts without buying a new one
  • If you expand the system very far you’ll be dealing with lots of amps, therefore large wire sizes
  • Lead Acid batteries aren’t known for their longevity, expect 300-500 cycles from a new battery


Parts

Beene Brothers strives to keep this in stock for $100 as a convenience. If we don’t have it available, Amazon and Aliexpress should be able to set up you with a unit.

Shoot me a text or call me, Christopher, at (682) 730-0725 to see what we might have in stock for solar panels.


Mid-Tier Off-Grid

1200 Watt Off-Grid Solar Setup

With 1.2Kw of Solar and a 3.8KWh battery this setup with the right sun exposure can run a 5000 BTU air conditioner for 6 hours while the sun shines and another 7 hours after dark. The Inverter listed below could even start the 8000 BTU air conditioner I tested it with, it’s a beefy unit.


Advantages

  • Large enough battery to run small air conditioner for 7 hours
  • Lithium batteries that should last 3000 cycles or more
  • 48 Volt system that requires much smaller wires to handle the wattage
  • Still room for more solar panels or bigger inverter

Disadvantages

  • Inverter is 1500 watts, could be undersized for running two AC’s or cooking equipment
  • Costs considerably more than the 12 volt system