Yes most big kettles are around 2500/2800 w and would require a 3500 output inverter which would kill a single battery dead maybe even two.My thoughts exactly Trev. The OP may have a good reason for trying this but it would seem to me that for all the good uses an invertor can be used for a kettle does not seem one of them. I also expect Rob is on the money. It will be too much power when it starts to boil.
The problem with that is in Devon we can't buy 7kg gas anywhere! Calor are blaming XCovid for a shortage of bottles to refillYes a 700w kettle which i have works, but would it not be better heating a tin kettle on gas and so not hammering the batteries with such a draw.
Thank you for your reply. Whoops Iv'e tried it now with a 600w travel kettle but still no joy! Do you think it's both batteries are deceased they are reading 12.8 on a multimeter. I have another one reading 14.7 attached to a solar panelA kettle uses an average of 1800W but the startup wattage may be higher than 2000.
Do you know the wattage of the kettle?
If you're using an inverter with huge loads like your kettle then your batteries need to be top notch.Thank you for your reply. Whoops Iv'e tried it now with a 600w travel kettle but still no joy! Do you think it's both batteries are deceased they are reading 12.8 on a multimeter. I have another one reading 14.7 attached to a solar panel
Hi Merl, I am on the case and will get back probably tomorrow Thanks xIf you're using an inverter with huge loads like your kettle then your batteries need to be top notch.
Assuming you're fully charging your batteries between each attempt do the following:
Using the 600W kettle.
Connect your voltmeter to the batteries and leave the meter connected while you run the kettle, monitor the voltage readings and note the start voltage and the end voltage, ie when the inverter stops working. Also the time between start and finish.
Do the same again but this time connect your meter at the 12V + and - terminals at the inverter.
Report back.
If you are not fitted with a pace-maker, then I would suggest you also consider an Induction Hob rather than a kettle.Thank you everyone for your kind advise .On the hunt now for a travel kettle
First thing i'd check is the power requirements of the kettle. If its exceeding the output of the inverter that will cause an alarm. Next i'd check size of the cables from battery to inverter. Volt drop is a real problem on 12v(power being used to warm cables), particularly at higher currents, you may find even though volts are high leaving battery, they arrive low enough at inverter to cause a low voltage trip. I run a similar rig with 1400w draw microwave and need at least 25mm tails and feeds from split charge main alternator to carry the 116 amp (1400/12) required, and thats splitting the power from main , aux batts & alternator & solar input, and assuming I can keep voltage from dipping below 12v. Also most pure leisure batteries are not designed to supply high currents, they have higher internal resistances therefore also suffer from volt drop. Check voltage at inverter input when under load. I get over this by always running the engine when microwave is on. Be real careful with running such high loads, the currents at 12v are so massive , fire is a real risk due to stuff melting. Make sure all cables and accessories are properly specced for the current and everything is super tight, appropriately fused and regularly inspected for overheating. If in any doubt about cable design consult a decent electrical engineer. Refillable gas bottle might be the way forward, or as others suggested a far lower powered kettle. Or even a twig stove/kelly kettle for emergencies. More batteries would also combat the leisure battery internal resistance issue but gets heavy & expensive. Hybrid batteries could help if not already fitted