Well they are but I am talking jan/Feb and we don't get much Sun at that time of the year and in lancashireWait a minute - - - Aren't green houses solar by nature? Just put a used fish tank upside down over your seed bed. Place it in the sun. That'll get things warmed up. Humid too.
What differential temperature do you need to maintain? That is a pretty large mat. You could get a rough estimate of power needs. I would be worried that your battery will not last long between charges.
Well the temperature wouldn't need to be high as the trays would be in touch with the mat or base so I would think 30deg at the mat and may be less than that if it was thermostatically controlled at that temp would be all I need but I don't know really and I don't know what a 12v battery would last before needing charging. I just wish I had power in the greenhouse. I will try and find out what a mains electric germination mats temperature reaches before it cuts out. Thanks for your interest.
Heating for much time using a battery is not going to work because the watt-hours in the battery will only power the heating pad for a fairly short time. Consider that a 50 watt heating pad will consume 50 watt hours of power in one hour, and at 12 volts and 20 amp-hours capacity that is 240 watt hours. That is less than 5 hours running from that battery.I am try to find an heatpad for seed germination but because I have no power in my greenhouse I was thinking of buying a 12v heatpad but nothing was found in a search so it sounds to me that this is impossible am I correct or can it be made.
Yes this is interesting and thank you for your interest also it is at a reasonable cost I am not sure I will take on board as again I would have to get power to the greenhouse which I am not wanting to do. But thank you.https://www.completecareshop.co.uk/dressing-and-comfort-aids/warming-aids/infrared-heated-lap-blanket-view-large?gclid=EAIaIQobChMI_aWHx6ud6QIVEeztCh1fQA-3EAQYBCABEgL79PD_BwE
This one might do you but I couldn't get a price. Maybe you need to register with them first: https://www.farmerboyag.com/stanfield-heat-mats
I can see what you mean thank you for your interest.Heating for much time using a battery is not going to work because the watt-hours in the battery will only power the heating pad for a fairly short time. Consider that a 50 watt heating pad will consume 50 watt hours of power in one hour, and at 12 volts and 20 amp-hours capacity that is 240 watt hours. That is less than 5 hours running from that battery.
So you really need to get a long enough extension cord of adequate current rating.
I offer that comment to help avoid a disappointment when reality becomes too clear. Electric heating uses a lot of power and the numbers are often not as obvious as they ought to be. Recharging a battery might be more of an inconvenience than dealing with an extension cord of adequate capability for the selected heater pad, but since I am not familiar with your situation that is purely a guess.I can see what you mean thank you for your interest.
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