DBK
LIFE MEMBER
The 1 amp per hour average will be over 24 hours but your solar panels don't work well at night of course. If for simplicity we assume you only get decent power from them over say 8 hours of each day then the solar needs to generate at least 3 amps over that period, which depending on the battery voltage is around 40W. However, batteries are not 100% efficient by any means so it might be safer to assume you need more than that pushed into the batteries. An efficiency of 85% is typical so in round numbers the solar needs to push out around 50W for those 8 hours of sunlight.Ok brainboxes (you know who you are)
If a 240v appliance uses 103kw of energy in a year, how many amps per hour will it consume at 12v if run through an inverter?
Guess The Amps
Thank you
These figures sound about right. Our compressor coolbox takes 2.5 amps when it kicks in but it only runs for about 5 minutes then sits quietly for about 15 minutes once it has reached the desired temperature inside. If I load it with beer and wine then it will run continuously for an hour or more until everything is chilled. I found with the original 90W panel we had, the batteries were getting low after a couple of days in a cloudy Brittany. Since I added a second panel of 100W we have been fine and this is with a power hungry Webasto heater running as well.
My feeling is if you have at least 200W of solar you will have no problems, especially if you don't have a Webasto. My brother's MH with 200W of solar has a compressor fridge and he did three weeks off EHU recently in Spain although that included a bit of driving every few days.
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