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Campsite Showers Water Heating. For Chris P.

50kVA diesel three phase generator supply.

Assume two male and two female showers, or are they all uni-sex these days?

I propose to suggest a large hot water tank for hot water storage, (thanks Simon Barker & Broadgage) then have three (say 1kW or 1.5kW or 2kW} immersion heaters if available, to heat the water. This will provide a balanced limited load to assist the generator in starting willingly. A single water thermostat controlling a three phase contactor to control the immersion heaters, to switch them all on or off at the same time. Perhaps a second maually re-settable  "safety" hot water thermostat to cut off it the water becomes too hot.

The hot water storage tank can have a coil for thermal solar panel water heating.

So, what capacity of tank will I need?

What will the heat recovery time be?

What types of showers and shower pump(s)?

If available where can such an insulated  tank be obtained?

What about hot water temperature safety at the shower heads?

Other?

Z.

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  • Just a thought here Zoom lad. You mention 3 phase and you mention different available KW rating of immersion heaters. Might it open up your options for KW loading of the whole system at start up for example using a 2 or 3 x 3KW bog standard heaters across 1 or 2  phases would effectively give you a better range to play with than non standard (more expensive and less readily available stuff).

    Example two 3KW heaters at 240 V wired in series would give you 2 x 0.75KW heaters equivalent. at 400V would give you 1.25KW x 2 heaters. Obviously i heater open circuit would cause the other heater to go open circuit, therefore switch off but I feel it might be easily mitigated. Worth a thought I think

    Note I`m working on 240/415 real volts rather than 230/400 perceived volts but the principal thinking is the same.

    Timing the fire up/shut down delays if using a few combinations could be beneficial too!

    The world is your lobster (or haddock) 

  • That is a very interesting suggestion ebee. I wanted to have a perfectly balanced load to keep the generator happy. I have seen small rated immersion heaters used in small unvented hot water tanks, but have not investigated this fully.

    The generator plate states 380 Volts.

    Z.

Reply
  • That is a very interesting suggestion ebee. I wanted to have a perfectly balanced load to keep the generator happy. I have seen small rated immersion heaters used in small unvented hot water tanks, but have not investigated this fully.

    The generator plate states 380 Volts.

    Z.

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