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Advice On Small Solar System


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Hi Everyone,

I have one 5kw Lux Power Inverter & 2 X Dyness BX51100 Battries.

I am selling one of my battries to a family member and going to add.

5 X 455 Solar Panels onto the system instead.

We use very small amounts of the battery during load shedding around 15% over two hours as one battery. 

Our house is a small town house and we use around a R1000 electricaty a month.

Will 5 X 455 panels be enough to help with the electricaty bill and help charge the battries? 

Is it a stupid idea to sell one of the battries to do solar sooner?

Many thanks in advance. 

 

 

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Hi

From what I have read on this forum, having a 5kw inverter the ideal match would be having 10kwh of battery capacity, so what you have would be ideal in that respect.

If you can keep those and add solar panels later. Is that a sna 5000 or lxp inverter? Reason I ask is with respect to cooling of the equipment as it looks like you have it mounted in a cupboard. If you have not already done so consider adding fans to move air through that space to keep it cool.

Also are those batteries .5c, if so more reason to keep the 2 of them.

Cheers

Sean

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13 hours ago, vrystaat said:

Hi

From what I have read on this forum, having a 5kw inverter the ideal match would be having 10kwh of battery capacity, so what you have would be ideal in that respect.

If you can keep those and add solar panels later. Is that a sna 5000 or lxp inverter? Reason I ask is with respect to cooling of the equipment as it looks like you have it mounted in a cupboard. If you have not already done so consider adding fans to move air through that space to keep it cool.

Also are those batteries .5c, if so more reason to keep the 2 of them.

Cheers

Sean

Hi Sean, 

Thank you very much for your time!

What I think I'll do then is buy the panels and save up for the install a bit later on. 

The inverter is an SNA5000 in my cupboard in my gym that was a garage. It has a ceiling in the garage so much cooler then your normal garage. I never close both cupboard doors I always leave one open or both if running heavier appliances. Do you think it will be okay In there?

I agree about keeping both battries as they are 5c and will rather buy the panels now and install them later on.

Many thanks again.

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16 hours ago, danieltherubin said:

Hi Everyone,

I have one 5kw Lux Power Inverter & 2 X Dyness BX51100 Battries.

I am selling one of my battries to a family member and going to add.

5 X 455 Solar Panels onto the system instead.

We use very small amounts of the battery during load shedding around 15% over two hours as one battery. 

Our house is a small town house and we use around a R1000 electricaty a month.

Will 5 X 455 panels be enough to help with the electricaty bill and help charge the battries? 

Is it a stupid idea to sell one of the battries to do solar sooner?

Many thanks in advance.

If you've promised the battery, then that's that 

I googled those batteries. They are C0.5. That means you can draw half the rated power. They allow C0.75 for short peaks. At present you have 10kW of battery, so you can draw a steady 5kW. Which you are unlikely to be doing, but this is a good match for your 5kW inverter. 

If you get rid of one battery then everything halves. Your battery can supply a steady 2.5kW and short peaks of 3.75kW.

It is the peaks we are concerned with here. Things like kettles can  consume 2kW for a short time. Anything that makes heat with an element or which has a motor has high peaks. 

Now I want to be sure of that 15%. Is that 15% of the 10kW you currently have? If so then that now doubles. 30 over 2 hours, 60 over 4.

So you end up with lower peak loads & half the capacity. 

What you will gain is solar panels. 

Panels save you money, batteries give you protection. 

Your tradeoff, but do you have some kind of monitoring tool that shows you constant loads and peak loads? That will give you good data. 

What happens during the night? Do you reserve the battery for load shed? Or do you try to run through the night? 

 

Edited by Bobster.
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Seems like 5kWh will suffice. Unless you can limit loads to under 3kW, you may have to keep the second battery. Note that you don't use enough power to get a quick payback. But solar does pay back,  reduces dependence on Eskom and and reduces dependance on local government.

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34 minutes ago, Bobster. said:

If you've promised the battery, then that's that 

I googled those batteries. They are C0.5. That means you can draw half the rated power. They allow C0.75 for short peaks. At present you have 10kW of battery, so you can draw a steady 5kW. Which you are unlikely to be doing, but this is a good match for your 5kW inverter. 

If you get rid of one battery then everything halves. Your battery can supply a steady 2.5kW and short peaks of 3.75kW.

It is the peaks we are concerned with here. Things like kettles can  consume 2kW for a short time. Anything that makes heat with an element or which has a motor has high peaks. 

Now I want to be sure of that 15%. Is that 15% of the 10kW you currently have? If so then that now doubles. 30 over 2 hours, 60 over 4.

So you end up with lower peak loads & half the capacity. 

What you will gain is solar panels. 

Panels save you money, batteries give you protection. 

Your tradeoff, but do you have some kind of monitoring tool that shows you constant loads and peak loads? That will give you good data. 

What happens during the night? Do you reserve the battery for load shed? Or do you try to run through the night? 

 

Hi Bobster, 

Thank you! 

So my dad wants another battery but I can just order him another. I don't need to get rid of this battery. 

I just wanted to get solar going but don't have the money to do it without selling a battery for the moment. 

By the sounds of things I should keep both battries and wait for solar later? 

So our house is all on except for the garages. I do have a bypass switch for half the kitchen that cuts off the kettle, microwave laundry machine and coffee machine that I can flick up if I want them on during load shedding. 

We used to use 10% on one battery during a two hour load shed that was everything except for the strong appliances I have listed above. 

Thanks again for your help!

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1 hour ago, danieltherubin said:

Hi Bobster, 

Thank you! 

So my dad wants another battery but I can just order him another. I don't need to get rid of this battery. 

I just wanted to get solar going but don't have the money to do it without selling a battery for the moment. 

By the sounds of things I should keep both battries and wait for solar later? 

So our house is all on except for the garages. I do have a bypass switch for half the kitchen that cuts off the kettle, microwave laundry machine and coffee machine that I can flick up if I want them on during load shedding. 

We used to use 10% on one battery during a two hour load shed that was everything except for the strong appliances I have listed above. 

Thanks again for your help!

Ok... I put it to you that this is not the whole picture. What about the geyser? 

It depends on what you want to do. If you want to get through a load shed then you may well be OK with the setup you propose, especially as you are clearly managing the loads well. 

Well done for looking after your dad. 

Edited by Bobster.
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