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Thanks ... just tried today...that was the reason for the question, already have 300w pure sine wave and when I connect get a load of beeping .....As pappajohn says, anything above a 150 watt inverter will suffice but I would allow some headroom so 300 is a good option. Also, before buying one, check whether the equipment is sensitive to wave form. Some items will not run off the cheaper quasi, or modified sine wave inverters and need a pure sine wave (PSW) model. If in doubt, go for a PSW version.
Your power consumption will be 150 watts divided by 12 volts = 12.5 amps (but you will draw a bit more due to the inverter's inefficiency - say it's 90% efficient) so assume 14 amps;
x 4 hours per day = 56 amps or 35% of your maximum battery capacity.
To replace that from the solar panel(s) I would guess you will need around 6+ hours of good sunlight in the 'high' season. Possible between May and September - not practical at other times (unless you are on the Med or North Africa). Either mains hook-up or a generator required between Oct and April/May in UK.
The "beeping" is because the inverter see the voltage dropping at the batteries and will not work. This tells me that your batteries are below 50% charge and are not up to the job and will soon be dead and unrecoverable. Try a full charge without any load on the batteries for 2 / 3 days then test again.Thanks ... just tried today...that was the reason for the question, already have 300w pure sine wave and when I connect get a load of beeping .....
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Thanks , away at present will do that on return.The "beeping" is because the inverter see the voltage dropping at the batteries and will not work. This tells me that your batteries are below 50% charge and are not up to the job and will soon be dead and unrecoverable. Try a full charge without any load on the batteries for 2 / 3 days then test again.
Thanks , away at present will do that on return.
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That's interesting. I'm new to using an inverter and I recently tried the one fitted to our MH. 1800w driven by 2 x 85 amp batteries (new). I ran a 1000w kettle until 1.7 ltr of water was boiled. In the first instance there was a lot of beeping and the unit kept cutting out (no power to the kettle). I persisted with resetting it and suddenly it settled down and completed the job. The batteries started at 12.8v dropped to 12.2 in use and then recover to 12.7v as the load switched off. With the aid of the SP on a very grey day they then recovered to 12.8v in about two hours and 13.0v in about four. Does all of that sound reasonable or should I be concerned?The "beeping" is because the inverter see the voltage dropping at the batteries and will not work. This tells me that your batteries are below 50% charge and are not up to the job and will soon be dead and unrecoverable. Try a full charge without any load on the batteries for 2 / 3 days then test again.
To be honest your asking too much from your batteries to boil a kettle and will kill them after a period of time. There is no way in two hours you replaced the amps taken out of your batteries in the UK sun. Even in Spain where we live it would take about 5/6 hours and I have 200watts of solar. So to answer your question yes be concerned as your will kill your batteries boiling a kettle. I'm in Norfolk right now and on an average day might and I say might replace about 10/12 amps over the whole day.That's interesting. I'm new to using an inverter and I recently tried the one fitted to our MH. 1800w driven by 2 x 85 amp batteries (new). I ran a 1000w kettle until 1.7 ltr of water was boiled. In the first instance there was a lot of beeping and the unit kept cutting out (no power to the kettle). I persisted with resetting it and suddenly it settled down and completed the job. The batteries started at 12.8v dropped to 12.2 in use and then with the aid of the SP on a very grey day recovered to 12.8 in about two hours and 13.0v in about four. Does all of that sound reasonable or should I be concerned?
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Why on earth use 12v to power a 1000w kettle? Gas is the most efficient way to boil water.
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The Nespresso machine takes next to nothing out so that will be fine, 15 minutes continuous with the hair dryer will be too much in my view so you had better supervise the usage.As you say I was only testing / trying the system out. In reality the only use the inverter will get is running the Nespresso machine (1260w for about 4 minutes) a couple of times in the morning and my wifes hair dryer (1400w) for about 15 mins twice a week. The batteries are 2 x 85 amp AGM's. I will always do my best to keep usage to a minimum.
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Assuming it took 5 minutes to boil you will have used just 7amps.That's interesting. I'm new to using an inverter and I recently tried the one fitted to our MH. 1800w driven by 2 x 85 amp batteries (new). I ran a 1000w kettle until 1.7 ltr of water was boiled. In the first instance there was a lot of beeping and the unit kept cutting out (no power to the kettle). I persisted with resetting it and suddenly it settled down and completed the job. The batteries started at 12.8v dropped to 12.2 in use and then recover to 12.7v as the load switched off. With the aid of the SP on a very grey day they then recovered to 12.8v in about two hours and 13.0v in about four. Does all of that sound reasonable or should I be concerned?
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Thanks @pappajohn. In fact it took about 10 mins to boil; so about 14 amps? How much for 15 mins at 1400w?Assuming it took 5 minutes to boil you will have used just 7amps.
In good sun it will take maybe 2 hours to replace that 7 amps.
The voltage you see after the kettle boiled will be solar output, not actual battery voltage.
Thanks @pappajohn. Pushing my luck then .29.6amps.
These figures dont include inverter losses and most are around 90% efficient
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There are some lucky ladies aroundJust bought my Wife a gas powered brush. Dries and styles all in one. ÂŁ24:99 bargain!! No need for the hairdryer
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To get back to my probs with the equipment I now find that although the machine is labelled 150 watt, on checking with the technicians to see if there was a 12v lead obtainable, found out that the warmer has a heating element that is 24 volt. ! (have 180w solar power and 2x80 batteries)
So back to the drawing board?? what size inverter would run said piece of equipment. (It is literally just a small plate that warms fluids) and is it just a case of replacing the existing 300w with bigger model ?
As before any help appreciated as a complete numpty with anything that sizzles apart from bubbly and barbecues
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