Oakholme rise, worksop. 4.2kw solar pv
4.2kW Solar PV system. East/West split.
Grid Neutral Ltd installed this system on a residential home in Worksop. This installation consists of 14x 300W panels, totalling 4.2 kW generation capacity. These are connected to a 3.68 kW Inverter Its common practice to slightly oversize an array in terms of power output; in this case its 14% oversize (20% is about the practical limit, depending on whether you have a split array, its orientation etc.) Whilst this means the inverter will ‘clip’ the power output of the array during very sunny periods, at all other times the array will be producing more electricity, which will enhance savings and overall energy yield.
Interestingly, an east west split actually delivers some interesting advantages over a single south-facing array: the array will start producing useable power far earlier in the morning – when you’re up switching your kettle on, making toast etc, produce marginally less peak power during the day – when you’re not necessarily in to make the most of it, then will keep producing energy further into the evening – when you’re home again making tea etc.
Whilst the annual energy yield won’t be quite as high as it would be if all 14 panels were on a single, south-facing roof, the savings will likely be significantly better. In this case, the home-owner reckons the household is “making savings of approximately £175/yr.” In addition, the Feed-inTariff has so far paid £205 for a year’s worth of generation. In summary, the house is better off by almost £400/yr. and it’s set to get better; the FiT will rise with inflation for the next 19 years and savings will likely increase as the cost of energy goes up. The homeowner also reports a significant feeling of satisfaction, “not unlike the feeling you get when your stood inside a shelter that you built whilst it protects you from a rainstorm”
Blyth Road, WOrksop. 3.6kWh Battery Storage
This project consisted of a Samsung SDI ESS Battery Storage System installed in the basement of a three bedroom, semi-detached suburban home in Worksop as part of an upgrade to an existing 4.13kW Solar PV system.
The system we installed in this home was a Samsung SDI ESS as specified by the owner. The unit provides 3 functions in one compact, albeit heavy, unit: PV inverter, battery inverter and lithium-ion battery. This is a great space saving solution and made for a fast, simple installation.
Like most battery storage systems, it also offers Web Monitoring – so the homeowner is able to track the energy generated by the system over the course of the season. It also shows savings made, both in terms of energy/cost and Carbon.
The Lithium-ion provides a long life of at least 6000 cycles which far outweighs batteries that rely on Lead-Acid batteries, though this is superseded with some of the systems we’re currently specifying and fitting – up to 10,000 cycles can be planned for.
With a nominal storage capacity of 3.6kWh (in practice, this works out at 3.2kWh storage due to Depth-of-Discharge limitations) and 3.68kW power rating, the home is able to offset a high proportion of energy during the summer and inter-seasonal months. The battery is actually capable of discharging at a rate of 4.6kW, however it is set to restrict power output to 16A (3.68kW) to comply with G98 regulations.
Combined with diligent use of energy in the household, the homeowner is able to show that electricity bills are now as low as 50p/week during the summer months (minus the daily standing charge)! Reductions are still sizeable either side of summer, and annual electricity bills for the house look set to be in the order of £140 – not bad for a family home with two young children.
Harrogate Road, Huby. 4.8kWh Battery Storage System
An enquiry was made with Grid Neutral to provide options for the repair/replacement of an faulty Solar PV inverter. It was a legacy installation, with 3.9kW of PV panels mounted on the roof of a garage. The homeowner was interested in adding battery storage but was not aware that a hybrid option, which could serve as both the battery charger and PV inverter, could be provided. We designed a DC-connected 3.68kW, 4.8kWh system consisting of a Solis Hybrid Inverter, and two 2.4 kWh batteries.
DC-connected storage systems are a good option for any installation, but particularly those where the in-situ inverter is no-longer covered by warranty; rather than add a separate inverter/charger as would be the case with an AC-connected system, we replace the existing inverter with a hybrid inverter that offers battery storage and benefits from a new, longer warranty. In this case, we provided an extended 10 year warranty. Something we do as standard.
The Solis system we installed is very efficient and reacts instantaneously to demand. The activity of the system is displayed on an LCD screen on the inverter. It shows how instantaneously the inverter reacts when loads such as kettles, washers are introduced. The homeowner has since reported excellent savings. Provided loads in the house are inside these figures for day/night times and there’s energy in the batteries, the amount of energy the house will have no-longer have to import from the grid is considerable.