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29/4/2024 at 1:23pm
Location: London
Outfit: Lunar Cosmos 524
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It's a mix and match kind of scenario with some unknown variables thrown in, so not really a definitive answer, only guidance!
Fridge will be rated at circa 120W, so 0.12kWh consumption, but should be tripping in and out on a thermostat so should be less in typical use. So up to 0.12 x 24 = 2.88 units per day, but likely closer to 1.5 units per day.
The electric hotplate will be circa 800W, so 0.8kWh, so 0.8 x 0.5 = 0.4 units per 1/2 hour use. Again, on a thermostat, so should consume slightly less.
The TV will be circa 20W, so 0.02kWh consumption. So 0.02 x 2 = 0.04 units per 2 hour use.
Lights, say 10W, that's 0.01kWh consumption. So 0.01 x 3 = 0.03 units per 3 hour use.
That totals to 1.97 units per day. Your 10 units should last 5 days or slightly more in theory.
What you have overlooked is the battery charger, the toilet flush pump, and the water pump. ... and of course the real killers - water heater, heating and microwave! Even if powered by gas, the heating will use some power for blowers (blown air) or pump (Alde) and controls systems!
Avoiding the 'killers', expect circa 3-4 days for your 10 units.
Don't shoot the messenger if you get a bill for excess! There are assumptions galore in there! 
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07/5/2024 at 2:16pm
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Quote: Originally posted by tdrees on 07/5/2024
Quote: Originally posted by marg6 on 30/4/2024
Quote: Originally posted by Monty15 on 30/4/2024
Quote: Originally posted by marg6 on 29/4/2024
Monty - "the heating will use some power for blowers (blown air)" that is false, the blowers work from 12 volts i.e. battery ok they draw the power and then the battery charger kicks in to recharge.
Not really 'false', true they are 12v powered, but the 'charger' is dual purpose and powers the 12v system as well as charges the battery, but will function with or without a battery fitted AND draws it power from the EHU, so 12v loads such as heater fans etc. ARE ultimately a load on the EHU.
not all caravans have the transformer (dual purpose unit) that your talking about tho, the lower/medium spec ones are still using a separate charger unit.
Unless you have solar, all electrical energy (12V and 240V) comes from one place - The EHU. Even if you have solar, and you are on hookup, the majority will come from EHU for the 12v systems unless you turn off the 240V to 12v charger.
the older caravans where "powered" via the zig unit and charged the battery using a separate charger, the newer vans have a transformer that replaces them both, and can even power the 12v system without the need for a battery in place
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