NotJustin Posted September 22, 2020 Share Posted September 22, 2020 Hi, I have been looking for a sign wave inverter 24v to run the whole house, our use isn't that heavy. With storage heaters we are using 44 kwh per day average over the year. I won't run the storage heaters off the inverter! Just a few lights, computer, fridge freezer, washing machine and perhaps it might handle the electric cooker, though we have gas backup. I'm just having trouble finding a good one, so often the reviews are very variable. I spend what I need to in order to get a good one. Thanks for any ideas! Justin Link to comment Share on other sites More sharing options...
joth Posted September 22, 2020 Share Posted September 22, 2020 The daily kWh is largely irrelevant, what is the peak power in watts? (Or the peak amperage) An electric cooker alone is 3kW plus, which is 100amps at 24V so fairly challenging to power on it's own. Link to comment Share on other sites More sharing options...
NotJustin Posted September 22, 2020 Author Share Posted September 22, 2020 I've seen some inverters that can hande peak 7000w but are about 3000w. Here's one I was looking at: https://amzn.to/3ckGf13 Link to comment Share on other sites More sharing options...
Temp Posted September 22, 2020 Share Posted September 22, 2020 https://www.cse.org.uk/advice/advice-and-support/how-much-electricity-am-i-using Says.. Washing machine is 1200-3000W Electric ovens 2000-2200 Freezer 200-400 Fridge 40-120 Computer 80-100 Call it 3500W to 6000W total Without more info on the actual appliances I'd be looking for something that can do over 6000W continuously. I suspect "Peak" figures are usually only guaranteed for a few seconds, eg to allow for motor start up. Link to comment Share on other sites More sharing options...
NotJustin Posted September 22, 2020 Author Share Posted September 22, 2020 Looks about right. I have a portable meter that I have been checking watts. Though, of course, I'd run more carefully when on the inverter. Link to comment Share on other sites More sharing options...
SteamyTea Posted September 22, 2020 Share Posted September 22, 2020 Are these small (relatively) inverters OK with induction loads? Link to comment Share on other sites More sharing options...
NotJustin Posted September 23, 2020 Author Share Posted September 23, 2020 I'm just having trouble finding larger ones for sale. Link to comment Share on other sites More sharing options...
SteamyTea Posted September 23, 2020 Share Posted September 23, 2020 1 hour ago, NotJustin said: I'm just having trouble finding larger ones for sale. Have a look at inverters that can me installed together, rather than 1 inverter that can 'do the lot'. It is a big ask to expect a single unit to deliver either 3W for a light bulb and then 7 kW or more for cooking. Link to comment Share on other sites More sharing options...
NotJustin Posted September 23, 2020 Author Share Posted September 23, 2020 cool, thanks, good plan Link to comment Share on other sites More sharing options...
Temp Posted September 23, 2020 Share Posted September 23, 2020 You also need to think about the battery and wiring carefully. 7000W at 24V = 290A. Link to comment Share on other sites More sharing options...
SteamyTea Posted September 23, 2020 Share Posted September 23, 2020 (edited) 120mm² For a 10 metre run. https://www.solar-wind.co.uk/info/dc-cable-wire-sizing-tool-low-voltage-drop-calculator and the circuit breaker will be huge. This sort of thing would need very careful design, probably better going up in DC voltage. 48V system would only need 35mm² 96V would only need 10mm² Now you are into 'normal' cable sizes. https://www.alibaba.com/product-detail/96-volt-5kw-6kw-7kw-power_62450791324.html?spm=a2700.7724857.normalList.127.159a6819aXCwIO (This might be a grid tied inverter, but you get the point) Edited September 23, 2020 by SteamyTea Link to comment Share on other sites More sharing options...
NotJustin Posted September 24, 2020 Author Share Posted September 24, 2020 (edited) I'd be quite happy to go up to 48v Thanks for all this info, very usefull. I've got plenty of "normal" cable, so it would be fine to go that way. Edited September 24, 2020 by NotJustin Link to comment Share on other sites More sharing options...
joth Posted September 24, 2020 Share Posted September 24, 2020 Sticking at 48V makes sense, above that DC becomes more dangerous for humans to deal with. (This is the reason PoE and phone networks both land at/around there) https://electronics.stackexchange.com/questions/267789/how-safe-is-48v-dc/267797 Link to comment Share on other sites More sharing options...
NotJustin Posted November 3, 2020 Author Share Posted November 3, 2020 I now have a 48v inverter, the seller tells me that it connects right at the mains, before my distribution box. Does anyone know how this gets wired up? I'm going to get an electician to do it, but I feel I need the info before that. Thank you. Link to comment Share on other sites More sharing options...
NotJustin Posted November 3, 2020 Author Share Posted November 3, 2020 Found this: Link to comment Share on other sites More sharing options...
NotJustin Posted November 3, 2020 Author Share Posted November 3, 2020 this is the imverter https://www.photonicuniverse.com/en/catalog/full/449-Iconica-5000W-48V-hybrid-pure-sine-wave-inverter-with-4000W-solar-input-80A-500V-MPPT-solar-controller-60A-mains-battery-charger-and-inbuilt-Bluetooth-No-battery-required.html Link to comment Share on other sites More sharing options...
Dave Jones Posted November 3, 2020 Share Posted November 3, 2020 https://www.victronenergy.com/inverters/phoenix-inverter-smart Link to comment Share on other sites More sharing options...
NotJustin Posted November 3, 2020 Author Share Posted November 3, 2020 I now have one of these: https://www.photonicuniverse.com/en/catalog/full/449-Iconica-5000W-48V-hybrid-pure-sine-wave-inverter-with-4000W-solar-input-80A-500V-MPPT-solar-controller-60A-mains-battery-charger-and-inbuilt-Bluetooth-No-battery-required.html It's just wiring it into the system I am unsure about Link to comment Share on other sites More sharing options...
NotJustin Posted November 3, 2020 Author Share Posted November 3, 2020 1 hour ago, Dave Jones said: https://www.victronenergy.com/inverters/phoenix-inverter-smart Is this for the connection diagrams? Link to comment Share on other sites More sharing options...
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