If you are not familiar with RenewSolar then you would not be aware that we have been a leading hardware seller in the UK for many year, in particular we have been driving down the cost of batteries with careful planning and working with partner businesses around the world to delivery quality products at great prices.
Buying a Solar battery or energy trading storage battery is important as energy prices are set to rise again. being able to self consume power, buy at cheap rate and sell at peak rates means that the cost of batteries and how much you pay and sell is of key importance.
Today, a 40kwh battery will charge at standard rates £9.51 from 0-100%
At Low rate that costs drops to £2.80.
With sell rate from £0.15 and £0.475 (£6.00 and £19.00) it makes sense to be able to sell power and also consume power from the lowest possible source and sell the remainder.
What sort of solar will you need?
6.66kw or 10kw solar arrays would be needed to power this battery.
What grid current will I need to charge in cheap rate?
Cheap rates vary in their operational time. some are fixed times others can vary. You may be paid to charge too!.
Typically cheap rate is 6 hours, and therefore a AC charge current of 30 amps is required (144amps DC)
What is the ROI?
With the current price of the battery and sell price of £0.15kWh the ROI would be 3.29 years (excluding charge costs) with low rate charging this grows to 4.69 years and at peak sell the ROI is just over 1 year.
The mean here is 2.25 years. if you have solar then the ROI period will be lower.
How much is a solar array for this battery?
Around £1,700, you would need a roof size of 10 meters by 5 meters to fit the solar.
What inverter would you recommend?
For this, two 8kw inverters. You need to discharge fairly quickly as the price points are usually set every 30 minutes. You need to be able to shift power within a short space of time. You also need to charge quickly if you see a paid to use period.
What power profiles would you use?
We wont tell you that, as its like stock trading. There are tools that we can make to automate the system for you or help along the way, but its fairly simple to work out. ( look at solar duck and bell)
Summer mid day hours will be a charge time as there is too much power available.
Winter usually is a discharge period. year round Peak demands are between 15:00 and 21:00 which will be your discharge time. as will 06:00 to 09:00.
Having solar alters the time that you discharge and charge and by how much. as summer comes the need to charge at night will reduce, as you may wait to solar charge for the morning period and top off when your paid to charge the battery during the peak hours, this means that the battery would be charged for the evening peak loads. If you are not trading, you will need to look at weather patens to ensure that you can meet your own loads, as getting this wrong could have a financial impact.
Why is the packs configured 4×2?
The amount of load that the battery can delivery as a whole is massive, but pulling a lot of power from the pack as a whole is not great, if there is two groups then the load between the groups and pack balances and the cables are also smaller as well as the loads over them. By splitting loads we use two cable, but we also reduce the current demands and share this demand.
a 400amp DC current is divided by two. (200amps) which then is divided by 4, meaning each batteries load is 50 amps. Then we consider fault conditions, if I say that the battery fault is 2000 amps, you may get the idea of the danger risks here, so we minimize this risks.
Why are your prices so low?
Its not magic, we have great suppliers and we have a keen business sense that keeps the costs down. Most other supplies have a lot of others involved that have hands to feed. We tend to jump all of these costs and time and go direct to the suppliers and manufactures.
If you think that’s interesting when the order is placed they buy the materials to make the battery cells themselves. We Gave up stocking batteries, it was pointless as we order and they are sold before they are made, so we were always on the back foot. As you can imaging battery storage takes a lot of space and requires maintenance, so makes sense? Also read the about us…
Am I compromising?
No. The hardware being used here is top tier and what you find in other more costly solutions.
You do get a warranty on this hardware.
We did not cut corners.
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