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Voltage and charge MBMS Charge Controller

  1. 10x 450w PV panels
  2. 1 x Hybrid Inverter.
  3. 2x 5.12kWH batteries.

Cost of 10 panels c 4.4 kWP just under £3k.  4.7kWh battery just over £3k. - V Competitive

A 12V solar panel is 16 - 18V solar panel in reality. Sure you can connect it but then you are relying on Battery Management System (BMS)to protect the battery from overcharge. At least install cheap PWM charge controller for 2nd layer of protection. There is no such thing as 12V vs 12.8V LiFePo4 battery.

Choosing the correct fuse

             

The fuse is your circuit protective device, its your means of automatic disconnection if this go wrong.

When your designing your system or circuit the following of what one should take into account:

  1. What is the biggest consumer of power
  2. Take into account cumulative demand say 100w at peak power for the fridge at the same time..in a circuit.
  3. Size of the fuse doesn't want to be greater than the current carrying capacity of the cable. If the fuse is greater than the cable then your cable becomes the fuse.

IR Value - How much current / power you can put in to the fuse and it still operates safely.

amount of current that can travel into the fuse and it still works safely - it still disconnects without catching fire, blowing up or melting, arcing - still allowing that full current to travel through it.

Type of fuse and where to buy...

Bargains are not the best choice. Purchasing suppliers who follow due diligence in what they are supplying. In essence this going direct to the manufacturer and finding evidence of data of what they have produced...if they know this or not...is key to evidencing their due diligence.

Data sheet from the manufacturing covering the voltage range they're using; the ampage that is available in that product, such as a 10A, 20A, 400A that that product is available in are all indicative of their due diligence..

ANL Fuse

CFM Terminal Fuse Block / Marine Rated Battery Fuse MRBF

this is outlined in the Marine Rated Battery Fuse (MRBF) With Fuse and Cable Sizing [CleverSolarPower by Nick]

Class-T Fuse-Holder 400A and 600A / Ceramic Fuse

this is outlined in the Class-T Fuse Holder [Pro Installer] These are big chuncky metal fuses for the circuit block. They withstand a significant flow current. The sand within given Cermanic Fuse should up to 20,000 amps withstand an Arc jumping either side of the Fuse or cermanic ring space... preventing a current flowing through your circuit / battery devices etc..

Testing a fuse in action:

this is outlined in the Testing a fuse in action

Circuit Breakers:

this is outlined in the Circuit Breakers Explained

Calculating the maximum short cirucit capacity a circuit could experience on LiFePo4 Battery

  • 648a LiFePo4 Battery
  • ICC: 650 x10 = 6500a
  • IR value: greater than 6500a

648a x 10 to understand the low resistence in this example of battery this is approximately 6500a ICC resistence the most one would expect resitence capacity under short circuit conditions. Whereas as comparison Lead Acide batteries have a greater resistence factor, that limits the amount of power the fault can create. Therefore the rate value of the battery maybe 648-650 amps, but the rule of thumb for a Lead Acide battery is 5x the ratable value of the battery (current capacity) is you times by a factor of 5 inlight of this greater resistence

  • 648a Lead Acide Battery
  • ICC: 650 x5 = 3250a
  • IR value: greater than 3250a

Reviewing different fuses IR Value

SHOW LINKS TO PRODUCT PAGES ON MERCHANT pages

Choosing the correct cable

  1. Size of cable
  2. Current carrying capacity of cable
  3. Making off - Shaving tightening of ends of cable can have significant effect on efficiency of transfer of current from PV to battery.

Demand.

The number one item of demand is often the oven or in the case of most homes today the kettle (2000 to 3000), the airfyer (1700w - 800 to 2000w depending on size), the coffee machine (1300w -800 to 1500), or the toaster (1300w -800 to 1500).

The inverter

Examples vary, and some reasonably priced on the market choices. Above all else the range of safety features on the Inverter lends helps determine the right choice...,/p>

The inverter say of 2000w can do a few hundred more depending on ambient temperture.

Choosing an inverter is important to go with a well established name that has been around for a reasonable amount of time.

Vitron, Renogy
  • Converts 12V to 230V AC with 3000W power and 6000W surge at >90% efficiency....
  • UPS auto-switches to battery in <50ms for uninterrupted power.
  • Quiet, safe operation with smart cooling and 5-layer protection.
  • Quick setup with clear terminals and wired remote.
  • CE/RoHS certified with UK warranty and support.
  • To power a 1700W air fryer, you'll need a battery with sufficient capacity (Ah) and a compatible inverter. A 1700W air fryer will draw approximately 14.17 amps at 120 volts. Therefore, you'll need a battery with enough amp-hours (Ah) to provide that current for the desired cooking time, plus an inverter with a wattage rating of at least 1700W. A good starting point is a 200Ah lithium battery, according to some van owners on Facebook, or potentially larger depending on your usage and other factors.

    Here's a breakdown:

    1. Calculate Amps:

    Amps = Watts / Volts

    For a 1700W air fryer on a 120V circuit, this is 1700 / 120 = 14.17 amps.

  • For a 240V circuit, it would be 1700 / 240 = 7.08 amps.

  • 2. Determine Battery Capacity (Ah):

    Battery Capacity:

    The amp-hour (Ah) rating of a battery indicates how much current it can deliver for a specific period.

    Desired Run Time:

    Consider how long you need the air fryer to run. If you want to run it for 30 minutes (0.5 hours), and it draws 14.17 amps, you'd need a battery with at least 14.17 * 0.5 = 7.085 Ah. However, this is just for the air fryer itself, and you need to factor in inverter losses and other potential loads.

    Inverter Losses:

    Inverters also consume power, so you'll need to account for that. A larger inverter will have higher losses.

    Other Loads:

    Consider if you'll be using other appliances simultaneously.

    Safety Margin:

    It's wise to have a battery capacity that is significantly larger than the bare minimum to ensure you're not constantly draining the battery to its limit.

    3. Choose a Suitable Inverter:

    Inverter Size:

    T

    he inverter should be rated for at least 1700W (or more, to provide a buffer).

    Inverter Type:

    Pure sine wave inverters are generally recommended for sensitive electronics like air fryers.

    4. Battery Type:

    Lithium-ion (LiFePO4):

    Generally preferred for their higher energy density, longer lifespan, and faster charging capabilities. They are more expensive upfront but can be more cost-effective in the long run.

    AGM:

    A good, more affordable option, but they have a shorter lifespan and may not perform as well under heavy loads compared to lithium.

    Example:

    Let's assume you want to run the air fryer for 30 minutes (0.5 hours) and want a 20% safety margin.

    If the air fryer draws 14.17 amps, you need 14.17 * 0.5 = 7.085 Ah for the air fryer.

    Adding a 20% safety margin, you'd need 7.085 * 1.2 = 8.5 Ah.

    However, you also need to consider inverter losses. If the inverter is 10% efficient, you'd need to add an extra 10% to the total, bringing it to 9.35 Ah. With other potential loads, it's wise to have a much larger battery capacity. A 200Ah lithium battery would be a good starting point for a 1700W air fryer, according to some van owners on Facebook. In summary: You'll need a battery with sufficient Ah to cover the air fryer's power draw, plus a 2000W or higher inverter. Lithium-ion batteries are a good choice for their performance and longevity, but AGM batteries can also be used. Always calculate your needs based on your specific usage and desired run time.

    Power It, Store It, Grow It. MyGreenTech supports individuals, families, communities and otherwise to develop their understanding, to source tech, to build and manage, and sustain all three. MyGreenTech seeks to share the balance between the demands of individuals and families as consumers as well as human beings open to developmental progress in realistic and meaningful way(s).

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