Invertor Battery Pack/System

Info_Seeker

Hi Folks,

Instead of moving to full fledged solar system, is there a way to install and charge a battery in night on lower rate and use it during the day (till it last)? I did basic research and it is probably called invertor battery pack/system. It is usually used in countries where power outages are long and common.

I have just started exploring this idea. Can someone please give some tips/leads on how/where to start?

Regards

Jonathan

https://www.boards.ie/discussion/2058371374/invertor-battery-pack-system

Yes, it's possible. The ME3000SP would be common enough with forum regulars here.

The problem is that if you are in Ireland, you are limited to 25A of inverter capacity on a NC6 application. It doesn't matter whether solar inverter or AC coupled battery, both count towards the 25A limit. Installing a ME3000SP means you've used 16A for batteries, leaving just 9A for a solar inverter. For this reason, hybrid inverters are very popular in Ireland.

Info_Seeker

https://www.boards.ie/discussion/comment/122669681#Comment_122669681

Thanks @Jonathan

Neither I have solar nor planning to have one. Just inquiring is there a way to install and charge a battery in night on lower rate and use it during the day (till it last)? I did basic research and it is probably called invertor battery pack/system. It is usually used in countries where power outages are long and common.

graememk

https://www.boards.ie/discussion/comment/122669883#Comment_122669883

The me3000 would be a storage inverter exactly what your looking for and is compatible with most 48v batteries. (Even lead acid, but would recommend LiFePO4)

Hybrid inverters are much more common and they perform every thing that the storage inverter does, but also can handle solar.

Usually more powerful too. (Charge and discharge at higher rates).

https://www.boards.ie/discussion/comment/122669883#Comment_122669883

It's very unlikey to be cost effective under any circumstances.

Info_Seeker

https://www.boards.ie/discussion/comment/122669927#Comment_122669927

Thanks @Shoog

Even if the night rate (2AM to 6AM) is one-third (or lower) of the day rate?

graememk

https://www.boards.ie/discussion/comment/122669959#Comment_122669959

Some rough numbers. Cycling a battery to 20%

15kWh battery, 12kWh useable. About 8% loss each way on charge and discharge. (Conversion losses)

To charge you will use 13kWh

You will get 11 out.

Energias 24 HR rate is 23.61c

The EV rate is 7.5c (if you use more than 1000kwh every 2 months anything above is 8.5ish) day rate on EV rate is 33c

So 11kwh at 24 HR rate will cost 2.59

To charge the batteries will cost 0.98.

Save 1.61 a day.

That's only if you stay within battery then your hit with the higher day rate of the EV plan.

If you already are on a EV plan because you have an EV or whatever, the numbers are a bit better at 2.65 a day.

Info_Seeker

https://www.boards.ie/discussion/comment/122670132#Comment_122670132

Thanks @graememk

Yes I have EV and EV electric plan.