Temp

@Pta Would be good to have a photo of the pump end of each manifold. Eg Framed to show one actuator and one flow meter, the pump, the isolation valve and the mixer. Some parts like the pump and mixer may have arrows or letters on them like F and R. If these arent visible in the photos can you mark up the photos in MS paint or similar. Eg like this photo without the bottom cut off..

@Pta Can you confirm you have two manifolds? Somewhat confusingly... On one manifold you have a blue isolation valve for the actuators. On the other its red. Obviously the colour of the knob doesn't matter but..

Looks like he has two manifolds, one with actuators/flow at the top and one with the actuators/flow at the bottom.

The short answer is no. I've had a good read of the datasheet and they don't say anything about using cell voltage to limit charge time. eg It does not say you can simply charge them until the cell voltage reaches 2.4V (or any particular voltage). In fact it even has a warning that "Continuous charge at 2.40 volts/cell will significantly reduce the battery life". If you want a voltage that the cells can be charged at indefinitely without overcharging that would be the float voltage 2.29V but that won't fully charge the battery. What charger do you have and what are its capabilities ? Instead of using cell voltage they recommend using a BMS system that measures the energy withdrawn from the battery on load and puts back in about 103% of that amount. They describe two ways that can be done in section 2.3.. 1) Using a charger that measures the exact Ah being put into the battery. In this case it says the charger should output a constant 2.4V. Then while charging the charger/BMS should measure the energy put back in and when it reaches the 103% figure it should stop fast charging and switch to float charging or reconnect the load. In float charging mode the charger should output a constant 2.29V. 2) Using a charger limited to a current of 0.5C for a calculated time. The charger should output a constant voltage that depends on temperature as per figure 4. Once the calculated time has expired it should stop fast charging and switch to float charging or reconnect the load. In float charging mode the charger should output a constant 2.29V. The reason is that the cell voltage varies depending on the type and make of the cell, its age and temperature. Cell voltage can be used but its really not a great indicator unless you have manufacturers data which they haven't provided.

Try and find a decent energy monitor to measure the exact consumption. In the absence of data.. If we assumed a load of 500W for 4 hours that's 2kWh. At about 48V thats about 2000/48 = 42 Ah. What capacity are the batteries? The Powersafe 12V 170FS is a range of batteries with a capacity from 31Ah to 190Ah depending on the exact model. So they could be anywhere from totally empty to 75% full depending on the model. Clearly they aren't totally flat though. What does it say on the batteries?

Putting insulation between the rafters as well, effectively moves some of the rafter towards the cold side so a condensation risk analysis should be done. Not sure I understand that. Are they saying 150mm PIR and OSB is sufficiently vapour permeable? Or did they do a proper condensation risk analysis for you based on the proposed build up?

My understanding is that it _might_ be possible to put some insulation between and above on a warm roof construction. However doing this moves some of the rafter towards the cold side so a condensation risk analysis should be done. It would also be advisable/essential to install a vapour barrier below the insulation. I recall reading that about a 1/3rd of the insulation between is about the maximum you can do.

You could also try asking on the HMRCs own VAT forum. I posted a link somewhere. Make sure to point out its part of the demolition process needed to allow construction of a new dwelling and ask if it should be zero rated under section 3.3.4 of VAT 708. I would be inclined not to include the quote itself. Just refer to it as the cost of taking down the overhead power line to the old house being demolished.

Cannot reclaim VAT for any labor, should be zero rated to you. I would argue its demolition. VAT 708.. 3.3.4

+1 They have to get written to the benefit of whoever owns another piece of land not just an individual named person.

What thickness of insulation are going for?

Yeah, no ventilated void needed a warm roof construction. Note for someone reading this in 5 years time... It's possible to have a "warm loft" with a "cold roof construction" and that would have a ventilated void.

I'm an electronics engineer but not familiar with this system at all. My interpretation would be that setting 13 is the battery voltage at which it switches from utility back to the battery. So let's say there is no Solar at all... The battery will deliver power to the load until the voltage falls to setting 12 (eg battery nearly empty) then it switches to the utility/mains. When the battery voltage recovers to setting 13 (nearly full?) it switches the load back to the battery. Therefore I would expect setting 13 to be higher than setting 12. One problem with this theory is that the battery voltage isn't always a good indication of the state of charge. It works better for lead acid than lithium or similar technology 12 and 13 probably shouldn't be two close together otherwise it might oscillate between battery and utility/mains. For example when the load is connected back to the battery the battery voltage will drop a bit even when it's full. That drop shouldn't take it below setting 12 or it will switch back to utility/mains, the battery voltage would then rise above setting 13 and it will switch it back to the battery.. repeat. I might be totally wrong !

PS The membrane should be a vapour permeable type. I've used VP400 in the past and it's strong stuff.

That is one way but check the membrane manufacture allows it in contact with OSB. I think Kingspan do one. Otherwise fit counter battens and then the membrane allowing it to drape between them. This is to allow water to run down under the tile battens rather than potentially pool above them.

We were allowed 1.5m deep trenches in clay after an inspection pit and soil report. House a few doors down was told they needed piles and they ended up going very deep.

For tiling they recommend allowing 1 day per mm of thickness. So 100 days downstairs and 50 upstairs. I would always use a flexible adhesive and BAL is probably the best brand (also for advice). What type of screed? Some anhydrite screeds need special care to remove a laitance that forms on the top before tiling.

Some of the bricks in the arch look longer than standard length bricks?

Further.. It might even be possible to prove it with maths. Eg show that with the normal 135L/person/day fittings and rainwater recycling you will draw less than 110L/person/day averaged over a year from the mains.

One possibility might be to appeal the Condition on the grounds that its not needed to meet Policy SP10 of the Local Plan because you are installing a Rainwater Recycling System.

No its an option at the planners discretion. See my post above.

Eg Valid options are.. Cold Loft with Cold Roof Construction Warm Loft with Cold Roof Construction Warm Loft with Warm Roof Construction

Its the old confusion between.. "Warm Roof" or "Warm loft" - insulation between rafters rather than on the floor of the loft. and "Warm Roof Construction" - meaning the structural members are on the warm side of the insulation.

Do you meet the rules for the Ecology Building Soc?

Put a bucket out in the garden and give it a go. Think there is probably enough acid in rainwater to keep it streak free.