#1 April 29, 2014 15:32:00

From: Southend
Registered: 2012-08-01
Posts: 273
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Energy Storage (heating)

Okay that is indeed a rather fancy title for just a castoff storage heater from a dismantled youth hostel, isn't it?

The idea was to temporarily replace central heating usage with a storage heater in the dining room, together with the lounge gas fire. And I recently got a £5 plug scheduler to set from the morning's weather forecast with the storage heater.

The basic idea seemed to be okay, in that the cloudless, cold nights do indeed seem to be those following sunny spring days when you can use the solar to power-up a storage heater for the evening. But I rapidly found that the weather sequence forecast in the morning is often none too accurate timing-wise! So we ended up experimenting with this only on sunny days when we were at home.

It typically used 3-4kWh of solar on the days concerned, and I've put into a chart the 'solar usage' effect for the month starting March 16th. Initially it also sucked up some grid electric too, until I got my plug-monitor onto it and found that the supposed 750W storage heater was in fact taking 1600W! (I'd been thinking that the evening heat output was a tad overkill for our purposes.)

I've not had the confidence to use it for less than sunny spring days, and I think I've concluded that for extended heating next springtime this approach really calls for a proportionate controller like the Wattson Solar Plus.

Economy 10 tariff provides 6.9p/kWh off-peak import between 12am-5am, 1pm-4pm and 8pm-10pm; http://www.pvoutput.org/aggregate.jsp?id=21047&sid=18934&v=2&t=m on approx. 63% off-peak usage, 22% solar usage, and 15% peak-rate usage.
1,900kWh annually is exported, mostly in summer, on approx. 3,200kWh generation. Approx. 4,500kWh/year is imported, mostly for (a) winter and springtime off-peak Storage Heaters, and (b) off-peak hot water Immersion heating (which is “dumb”, i.e. not linked to the solar PV).
PV array is split East-West. Income is from Phase II 21p/kWh Feed-in-Tariff plus smart metered 3.2p/kWh Export Tariff.

Edited rogerhoward (April 29, 2014 15:32:00)


#2 Jan. 31, 2015 19:52:03

Registered: 2014-06-29
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Energy Storage (heating)

if you link this with a PV router of some kind - I use the immersun but there are others like iboost and solarimmersion I think, then you only power the heater when sufficient generation is present


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