Continue to Site

Welcome to our site!

Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

I need some advice on building a battery charger for my bank of 20 Li-ion 5000mAh 26650A

Hey there back again.

Been really busy with one thing and another.

So to continue I have now settled on the following ;

  • 240v AC Pure Sine Wave Inverter - 12V 3000VA
  • 12V 608Ah Deep Cycle Battery
This is based on the following consumption

1) Desktop 500w psu no more than 8 hours, and a workstation

a) 1140w workstation (iron & heat gun) only used periodically

2) Microwave 900w twice a day for no more than 10 minutes

3) Panasonic TV 31w no more than 6 hours

4) Sky Set-top box 30w standby daily

5) Fridge - Freezer 195kWh pa = 22w per day (I think)

6) Kettle periodically 1500w


UK Voltage 220v 50Hz.

I plan on building a low-level plinth 600 x 600mm (similar to a pallet) this will allow free flow of air.

These will be sited in the hall next to a double-switched socket - the length of the cable will be enough to run from the battery to the inverter without any stretching.

I will then run extension leads to the various appliances as needed.

i.e. Starting with extension lead to desktop power down then move to kettle, let it boil then move the lead to microwave etc. TV (31w), set-top box (30w), fridge freezer (22w/day) will remain on, well I have to pay something at least to the supplier, otherwise, they will think that I am trying to fiddle with the electricity supply.

I am trying to work out the cable size in mm for the run from the battery to the inverter, less than a meter, and so no voltage drop.

There will be no re-sending power back to the grid, so that eliminates any further problems.

Something that I have picked up on in the battery specifications in the above leisure battery has a 3500-cycle life @ 80%

So how many cycles would this battery have at a DoD of 10%?

The reason why I say this is because the consumption that I have given you is basically what I use on a daily basis and as stated periodically & 1440w workstation (iron & heat gun), this only comes into play when needed.

Something else I have found is that there are several types of Deep Cycle Batteries:

Flooded Lead-Acid: Require regular maintenance such as adding water.

Absorbent Glass Mat (AGM):

Gel Cell: Sealed and maintenance-free

Lithium-Ion batteries
>
Which sort do you people suggest?

This then brings into play my break-even if that is a variable.

I pay my gas & electric supplier £60.00 per month & that's using no gas, I am now waiting for the Government's decision on the "standing charge"

So based on £60.00 - - - DoD 10% for me is going to be way far better than DoD 80%
>
Battery size and inverter size are not set in stone so if you kind people can point me in different compatible units then I am all ears.
 

New Articles From Microcontroller Tips

Back
Top