NINOT Posted October 15, 2023 Share Posted October 15, 2023 Hallo, I have two 80Ah lead acid batteries, 200W solar panel and Efoy 900. What size of an inverter can I install? The only usage would be a hairdryer and a toaster for a few minutes. I would get 800-850W appliances. Thank you Quote Link to comment Share on other sites More sharing options...
MikeF Posted October 15, 2023 Share Posted October 15, 2023 An inverter rated at 1000 watts would seem suitable. Needs to be a quality unit, lots of units on ebay/amazon cannot deliver to specification. With voltage sag on the batteries and inverter efficiency there will be a current draw of around 90 amps. Whilst two 80Ah will produce that current, they will be stressed somewhat and may have a reduced service life. However if early replacement is needed, then regard this as the cost of having toast. https://www.splitcharge.co.uk/product/pro-power-sb-pure-sine-wave-inverters-12v-1000w/ https://www.roadpro.co.uk/product/02i-inverters/nds-smart-inverter-pure-sine-wave-12v-1000w-c7682/C7682 https://www.12voltplanet.co.uk/victron-phoenix-pure-sine-wave-inverter-12v-1200w-vedirect-enabled.html The above examples can be obtained from other suppliers. Technically you don't need a pure sine wave for devices with heating elements, but even simple things like hair driers may have electronic control that needs a sinewave voltage. It also allows connecting other appliances without worry. The installation needs suitable cable, at least 25mm2, with a Mega link fuse plus fuse holder, 125 amps, the fuse ideally mounted within 15 cm of the battery post. Fit the inverter as close as practical to the battery. If a long run of cable is need go up a size. It's possible to buy ready made terminated cables, example, https://www.sunshinesolar.co.uk/Item/BATCAB35 Mike 1 Quote Link to comment Share on other sites More sharing options...
NINOT Posted October 16, 2023 Author Share Posted October 16, 2023 Thank you very much Quote Link to comment Share on other sites More sharing options...
poe Posted October 22, 2023 Share Posted October 22, 2023 Ninot make sure you get a pure sine wave inverter they're the best Quote Link to comment Share on other sites More sharing options...
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