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 Topic: Solar and batteries
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20/1/2021 at 2:44pm
Location: East Herts
Outfit: 1992 Elddis Wisp 450CT + X Trail
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Joined: 05/11/2013 Diamond Member 
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I presume this is a 240 volt 500 watt heater you have. If this is so, then you will be running it through an inverter and inverters take power to run themselves. Therefore the consumption of the inverter would need to be taken into account too. To get 500 watts at 240 volts out you would need to put quite a bit more than 500 watts at 12 volts in, because of the inverter's consumption. Those batteries would probably be very flat by morning and would take a considerable amount of power and time to recharge, so that set-up might just about work for one night, but I very much doubt it would work for a second night. Solar panels only give their maximum rated power if they are angled directly into bright sunlight and kept at that correct angle, which would mean constantly turning them with the sun. Laid flat their output reduces quite dramatically, as it does when there is only hazy sun or less. They will work just using daylight, but at massively reduced output.
In my opinion, solar panels are great for keeping a leisure battery topped up while the caravan is not being used, but not much else.
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Best Regards,
Colin
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21/1/2021 at 8:38pm
Location: West country
Outfit: Mondeo
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The figures below are the predicted output of a 245kwh PV system with panels fixed in position angled for optimum annual production. You can see the percentage output per month with Jan at 2.79% and May/June being over 13%. That shows how much less you will get in each winter month.
Month % of yearly production (PV GIS) Production per month (kWh)
January 2.79% 6,446
February 4.43% 10,235
March 8.28% 19,130
April 10.93% 25,252
May 13.15% 30,381
June 13.25% 30,612
July 12.96% 29,942
August 12.09% 27,932
September 9.72% 22,457
October 6.52% 15,063
November 3.81% 8,802
December 2.07% 4,782
Total 100.00% 231,034
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via mobile 23/1/2021 at 4:30pm
