Thinking of a simple way of cooking direct with PV in the summer - ie, DC, no batteries or inverters. This concept seems simple and scalable
I am envisioning something pretty scaled up - using around 3kW of PV.
I am considering using PTC elements.Ask me about a cataloque with some basic information on them. They negate the need for a thermostat which is handy.
I am struggling to wrap my head around how PTC performs when hooked up to PV. I am aware that traditional resistive elements require impedance matching - and ideally MPPT controllers to increase efficiency. With PTC elements the resistance increases as the temperature rises.
I've tested this on a small scale with a 60w panel and 12v PTC element. Gets up to the set temperature pretty quickly but I've no real means of ascertaining the efficiency.
I can show you a little cooker that got me thinking - according the manufacturer it uses around 85kWh/week which I can match in Summer with PV.
Construction something a bit like this perhaps -

- http://heatkit.com/html/bakeov11.htm
Here's a small example of the same idea...

MOD NOTE: Please do not include catalogue or weblinks to solar equipment without first getting approval from the Admin
I am envisioning something pretty scaled up - using around 3kW of PV.
I am considering using PTC elements.Ask me about a cataloque with some basic information on them. They negate the need for a thermostat which is handy.
I am struggling to wrap my head around how PTC performs when hooked up to PV. I am aware that traditional resistive elements require impedance matching - and ideally MPPT controllers to increase efficiency. With PTC elements the resistance increases as the temperature rises.
I've tested this on a small scale with a 60w panel and 12v PTC element. Gets up to the set temperature pretty quickly but I've no real means of ascertaining the efficiency.
I can show you a little cooker that got me thinking - according the manufacturer it uses around 85kWh/week which I can match in Summer with PV.
Construction something a bit like this perhaps -

- http://heatkit.com/html/bakeov11.htm
Here's a small example of the same idea...

MOD NOTE: Please do not include catalogue or weblinks to solar equipment without first getting approval from the Admin
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